More xattr improvments/fixes, including tests for proper functioning

[rsync/rsync-patches.git] / xattrs.diff

This patch adds support for extended attributes.

To use this patch, run these commands for a successful build:

    patch -p1 <patches/xattrs.diff
    ./prepare-source
    ./configure
    make

CAUTION:  this patch has been recently reworked, and needs more testing!

--- old/Makefile.in
+++ new/Makefile.in
@@ -28,13 +28,13 @@ VERSION=@VERSION@
 
 HEADERS=byteorder.h config.h errcode.h proto.h rsync.h smb_acls.h lib/pool_alloc.h
 LIBOBJ=lib/wildmatch.o lib/compat.o lib/snprintf.o lib/mdfour.o lib/md5.o \
-	lib/permstring.o lib/pool_alloc.o lib/sysacls.o @LIBOBJS@
+	lib/permstring.o lib/pool_alloc.o lib/sysacls.o lib/sysxattrs.o @LIBOBJS@
 ZLIBOBJ=zlib/deflate.o zlib/inffast.o zlib/inflate.o zlib/inftrees.o \
 	zlib/trees.o zlib/zutil.o zlib/adler32.o zlib/compress.o zlib/crc32.o
 OBJS1=flist.o rsync.o generator.o receiver.o cleanup.o sender.o exclude.o \
 	util.o main.o checksum.o match.o syscall.o log.o backup.o
 OBJS2=options.o io.o compat.o hlink.o token.o uidlist.o socket.o \
-	fileio.o batch.o clientname.o chmod.o acls.o
+	fileio.o batch.o clientname.o chmod.o acls.o xattrs.o
 OBJS3=progress.o pipe.o
 DAEMON_OBJ = params.o loadparm.o clientserver.o access.o connection.o authenticate.o
 popt_OBJS=popt/findme.o  popt/popt.o  popt/poptconfig.o \
--- old/backup.c
+++ new/backup.c
@@ -23,6 +23,7 @@
 extern int verbose;
 extern int am_root;
 extern int preserve_acls;
+extern int preserve_xattrs;
 extern int preserve_devices;
 extern int preserve_specials;
 extern int preserve_links;
@@ -134,6 +135,9 @@ static int make_bak_dir(char *fullpath)
 #ifdef SUPPORT_ACLS
 				sx.acc_acl = sx.def_acl = NULL;
 #endif
+#ifdef SUPPORT_XATTRS
+				sx.xattr = NULL;
+#endif
 				if (!(file = make_file(rel, NULL, NULL, 0, NO_FILTERS)))
 					continue;
 #ifdef SUPPORT_ACLS
@@ -143,7 +147,14 @@ static int make_bak_dir(char *fullpath)
 					free_acl(&sx);
 				}
 #endif
-				set_file_attrs(fullpath, file, NULL, 0);
+#ifdef SUPPORT_XATTRS
+				if (preserve_xattrs) {
+					get_xattr(rel, &sx);
+					cache_xattr(file, &sx);
+					free_xattr(&sx);
+				}
+#endif
+				set_file_attrs(fullpath, file, NULL, NULL, 0);
 				free(file);
 			}
 		}
@@ -194,6 +205,9 @@ static int keep_backup(const char *fname
 #ifdef SUPPORT_ACLS
 	sx.acc_acl = sx.def_acl = NULL;
 #endif
+#ifdef SUPPORT_XATTRS
+	sx.xattr = NULL;
+#endif
 
 	if (!(file = make_file(fname, NULL, NULL, 0, NO_FILTERS)))
 		return 1; /* the file could have disappeared */
@@ -210,6 +224,13 @@ static int keep_backup(const char *fname
 		free_acl(&sx);
 	}
 #endif
+#ifdef SUPPORT_XATTRS
+	if (preserve_xattrs) {
+		get_xattr(fname, &sx);
+		cache_xattr(file, &sx);
+		free_xattr(&sx);
+	}
+#endif
 
 	/* Check to see if this is a device file, or link */
 	if ((am_root && preserve_devices && IS_DEVICE(file->mode))
@@ -288,7 +309,7 @@ static int keep_backup(const char *fname
 			robust_unlink(fname); /* Just in case... */
 		}
 	}
-	set_file_attrs(buf, file, NULL, 0);
+	set_file_attrs(buf, file, NULL, fname, 0);
 	unmake_file(file);
 
 	if (verbose > 1) {
--- old/cleanup.c
+++ new/cleanup.c
@@ -142,7 +142,7 @@ NORETURN void _exit_cleanup(int code, co
 				flush_write_file(cleanup_fd_w);
 				close(cleanup_fd_w);
 			}
-			finish_transfer(cleanup_new_fname, fname, NULL,
+			finish_transfer(cleanup_new_fname, fname, NULL, NULL,
 					cleanup_file, 0, !partial_dir);
 		}
 
--- old/compat.c
+++ new/compat.c
@@ -43,6 +43,7 @@ extern int protocol_version;
 extern int preserve_uid;
 extern int preserve_gid;
 extern int preserve_acls;
+extern int preserve_xattrs;
 extern int preserve_hard_links;
 extern int need_messages_from_generator;
 extern int delete_mode, delete_before, delete_during, delete_after;
@@ -65,6 +66,8 @@ void setup_protocol(int f_out,int f_in)
 		preserve_gid = ++file_extra_cnt;
 	if (preserve_acls && !am_sender)
 		preserve_acls = ++file_extra_cnt;
+	if (preserve_xattrs)
+		preserve_xattrs = ++file_extra_cnt;
 
 	if (remote_protocol == 0) {
 		if (!read_batch)
@@ -119,6 +122,13 @@ void setup_protocol(int f_out,int f_in)
 			    protocol_version);
 			exit_cleanup(RERR_PROTOCOL);
 		}
+		if (preserve_xattrs) {
+			rprintf(FERROR,
+			    "--xattrs requires protocol 30 or higher"
+			    " (negotiated %d).\n",
+			    protocol_version);
+			exit_cleanup(RERR_PROTOCOL);
+		}
 	}
 
 	if (delete_mode && !(delete_before+delete_during+delete_after)) {
--- old/configure.in
+++ new/configure.in
@@ -891,6 +891,46 @@ samba_cv_HAVE_ACL_GET_PERM_NP=yes,samba_
     esac
 fi
 
+AC_CHECK_HEADERS(attr/xattr.h)
+AC_CHECK_HEADERS(sys/xattr.h)
+AC_CHECK_HEADERS(sys/extattr.h)
+
+#################################################
+# check for extended attribute support
+AC_MSG_CHECKING(whether to support extended attributes)
+AC_ARG_ENABLE(xattr-support,
+	AC_HELP_STRING([--disable-xattr-support],
+		       [Turn off extended attribute support]))
+
+if test x"$enable_xattr_support" = x"no"; then
+    AC_MSG_RESULT(no)
+else
+    case "$host_os" in
+    *linux*)
+	AC_MSG_RESULT(Using Linux xattrs)
+	AC_DEFINE(HAVE_LINUX_XATTRS, 1, [True if you have Linux xattrs])
+	AC_DEFINE(SUPPORT_XATTRS, 1, [Define to 1 to add support for extended attributes])
+	;;
+    darwin*)
+	AC_MSG_RESULT(Using OS X xattrs)
+	AC_DEFINE(HAVE_OSX_XATTRS, 1, [True if you have Mac OS X xattrs])
+	AC_DEFINE(SUPPORT_XATTRS, 1)
+	;;
+    freebsd*)
+	AC_MSG_RESULT(Using FreeBSD extattrs)
+	AC_DEFINE(HAVE_FREEBSD_XATTRS, 1, [True if you have FreeBSD xattrs])
+	AC_DEFINE(SUPPORT_XATTRS, 1)
+	;;
+    *)
+	if test x"$enable_xattr_support" = x"yes"; then
+	    AC_MSG_ERROR(Failed to find extended attribute support)
+	else
+	    AC_MSG_RESULT(No extended attribute support found)
+	fi
+	;;
+    esac
+fi
+
 AC_CONFIG_FILES([Makefile lib/dummy zlib/dummy popt/dummy shconfig])
 AC_OUTPUT
 
--- old/flist.c
+++ new/flist.c
@@ -43,6 +43,7 @@ extern int one_file_system;
 extern int copy_dirlinks;
 extern int keep_dirlinks;
 extern int preserve_acls;
+extern int preserve_xattrs;
 extern int preserve_links;
 extern int preserve_hard_links;
 extern int preserve_devices;
@@ -888,6 +889,10 @@ static struct file_struct *recv_file_ent
 	if (preserve_acls && !S_ISLNK(mode))
 		receive_acl(file, f);
 #endif
+#ifdef SUPPORT_XATTRS
+	if (preserve_xattrs)
+		receive_xattr(file, f );
+#endif
 
 	if (S_ISREG(mode) || S_ISLNK(mode))
 		stats.total_size += file_length;
@@ -1160,7 +1165,7 @@ static struct file_struct *send_file_nam
 					  int flags, int filter_flags)
 {
 	struct file_struct *file;
-#ifdef SUPPORT_ACLS
+#if defined SUPPORT_ACLS || defined SUPPORT_XATTRS
 	statx sx;
 #endif
 
@@ -1179,6 +1184,13 @@ static struct file_struct *send_file_nam
 			return NULL;
 	}
 #endif
+#ifdef SUPPORT_XATTRS
+	if (preserve_xattrs && f >= 0) {
+		sx.xattr = NULL;
+		if (get_xattr(fname, &sx) < 0)
+			return NULL;
+	}
+#endif
 
 	maybe_emit_filelist_progress(flist->count + flist_count_offset);
 
@@ -1192,6 +1204,12 @@ static struct file_struct *send_file_nam
 			free_acl(&sx);
 		}
 #endif
+#ifdef SUPPORT_XATTRS
+		if (preserve_xattrs) {
+			F_XATTR(file) = send_xattr(&sx, f);
+			free_xattr(&sx);
+		}
+#endif
 	}
 	return file;
 }
--- old/generator.c
+++ new/generator.c
@@ -36,6 +36,7 @@ extern int relative_paths;
 extern int implied_dirs;
 extern int keep_dirlinks;
 extern int preserve_acls;
+extern int preserve_xattrs;
 extern int preserve_links;
 extern int preserve_devices;
 extern int preserve_specials;
@@ -532,11 +533,19 @@ int unchanged_attrs(const char *fname, s
 			return 0;
 	}
 #endif
+#ifdef SUPPORT_XATTRS
+	if (preserve_xattrs) {
+		if (!XATTR_READY(*sxp))
+			get_xattr(fname, sxp);
+		if (xattr_diff(file, sxp, 0))
+			return 0;
+	}
+#endif
 
 	return 1;
 }
 
-void itemize(const char *fname, struct file_struct *file, int ndx, int statret,
+void itemize(const char *fnamecmp, struct file_struct *file, int ndx, int statret,
 	     statx *sxp, int32 iflags, uchar fnamecmp_type,
 	     const char *xname)
 {
@@ -562,16 +571,24 @@ void itemize(const char *fname, struct f
 #ifdef SUPPORT_ACLS
 		if (preserve_acls && !S_ISLNK(file->mode)) {
 			if (!ACL_READY(*sxp))
-				get_acl(fname, sxp);
+				get_acl(fnamecmp, sxp);
 			if (set_acl(NULL, file, sxp) == 0)
 				iflags |= ITEM_REPORT_ACL;
 		}
 #endif
+#ifdef SUPPORT_XATTRS
+		if (preserve_xattrs) {
+			if (!XATTR_READY(*sxp))
+				get_xattr(fnamecmp, sxp);
+			if (xattr_diff(file, sxp, 1))
+				iflags |= ITEM_REPORT_XATTR;
+		}
+#endif
 	} else
 		iflags |= ITEM_IS_NEW;
 
 	iflags &= 0xffff;
-	if ((iflags & SIGNIFICANT_ITEM_FLAGS || verbose > 1
+	if ((iflags & (SIGNIFICANT_ITEM_FLAGS|ITEM_REPORT_XATTR) || verbose > 1
 	  || stdout_format_has_i > 1 || (xname && *xname)) && !read_batch) {
 		if (protocol_version >= 29) {
 			if (ndx >= 0)
@@ -581,6 +598,10 @@ void itemize(const char *fname, struct f
 				write_byte(sock_f_out, fnamecmp_type);
 			if (iflags & ITEM_XNAME_FOLLOWS)
 				write_vstring(sock_f_out, xname, strlen(xname));
+#ifdef SUPPORT_XATTRS
+			if (iflags & ITEM_REPORT_XATTR && !dry_run)
+				send_xattr_request(NULL, file, sock_f_out);
+#endif
 		} else if (ndx >= 0) {
 			enum logcode code = logfile_format_has_i ? FINFO : FCLIENT;
 			log_item(code, file, &stats, iflags, xname);
@@ -855,14 +876,14 @@ static int try_dests_reg(struct file_str
 			if (preserve_hard_links && F_IS_HLINKED(file))
 				finish_hard_link(file, fname, &sxp->st, itemizing, code, j);
 			if (itemizing && (verbose > 1 || stdout_format_has_i > 1)) {
-				itemize(fname, file, ndx, 1, sxp,
+				itemize(cmpbuf, file, ndx, 1, sxp,
 					ITEM_LOCAL_CHANGE | ITEM_XNAME_FOLLOWS,
 					0, "");
 			}
 		} else
 #endif
 		if (itemizing)
-			itemize(fname, file, ndx, 0, sxp, 0, 0, NULL);
+			itemize(cmpbuf, file, ndx, 0, sxp, 0, 0, NULL);
 		if (verbose > 1 && maybe_ATTRS_REPORT)
 			rprintf(FCLIENT, "%s is uptodate\n", fname);
 		return -2;
@@ -879,9 +900,13 @@ static int try_dests_reg(struct file_str
 			}
 			return -1;
 		}
+		set_file_attrs(fname, file, NULL, cmpbuf, 0);
 		if (itemizing)
-			itemize(fname, file, ndx, 0, sxp, ITEM_LOCAL_CHANGE, 0, NULL);
-		set_file_attrs(fname, file, NULL, 0);
+			itemize(cmpbuf, file, ndx, 0, sxp, ITEM_LOCAL_CHANGE, 0, NULL);
+#ifdef SUPPORT_XATTRS
+		if (preserve_xattrs)
+			xattr_clear_locals(file);
+#endif
 		if (maybe_ATTRS_REPORT
 		 && ((!itemizing && verbose && match_level == 2)
 		  || (verbose > 1 && match_level == 3))) {
@@ -1029,7 +1054,7 @@ static int try_dests_non(struct file_str
 			    : ITEM_LOCAL_CHANGE
 			     + (match_level == 3 ? ITEM_XNAME_FOLLOWS : 0);
 			char *lp = match_level == 3 ? "" : NULL;
-			itemize(fname, file, ndx, 0, sxp, chg + ITEM_MATCHED, 0, lp);
+			itemize(cmpbuf, file, ndx, 0, sxp, chg + ITEM_MATCHED, 0, lp);
 		}
 		if (verbose > 1 && maybe_ATTRS_REPORT) {
 			rprintf(FCLIENT, "%s%s is uptodate\n",
@@ -1112,6 +1137,9 @@ static void recv_generator(char *fname, 
 #ifdef SUPPORT_ACLS
 	sx.acc_acl = sx.def_acl = NULL;
 #endif
+#ifdef SUPPORT_XATTRS
+	sx.xattr = NULL;
+#endif
 	if (dry_run > 1) {
 		if (fuzzy_dirlist) {
 			flist_free(fuzzy_dirlist);
@@ -1224,7 +1252,7 @@ static void recv_generator(char *fname, 
 				goto cleanup;
 			}
 		}
-		if (set_file_attrs(fname, file, real_ret ? NULL : &real_sx, 0)
+		if (set_file_attrs(fname, file, real_ret ? NULL : &real_sx, NULL, 0)
 		    && verbose && code != FNONE && f_out != -1)
 			rprintf(code, "%s/\n", fname);
 		if (real_ret != 0 && one_file_system)
@@ -1278,9 +1306,9 @@ static void recv_generator(char *fname, 
 			else if ((len = readlink(fname, lnk, MAXPATHLEN-1)) > 0
 			      && strncmp(lnk, sl, len) == 0 && sl[len] == '\0') {
 				/* The link is pointing to the right place. */
+				set_file_attrs(fname, file, &sx, NULL, maybe_ATTRS_REPORT);
 				if (itemizing)
 					itemize(fname, file, ndx, 0, &sx, 0, 0, NULL);
-				set_file_attrs(fname, file, &sx, maybe_ATTRS_REPORT);
 #ifdef SUPPORT_HARD_LINKS
 				if (preserve_hard_links && F_IS_HLINKED(file))
 					finish_hard_link(file, fname, &sx.st, itemizing, code, -1);
@@ -1317,7 +1345,7 @@ static void recv_generator(char *fname, 
 			rsyserr(FERROR, errno, "symlink %s -> \"%s\" failed",
 				full_fname(fname), sl);
 		} else {
-			set_file_attrs(fname, file, NULL, 0);
+			set_file_attrs(fname, file, NULL, NULL, 0);
 			if (itemizing) {
 				itemize(fname, file, ndx, statret, &sx,
 					ITEM_LOCAL_CHANGE, 0, NULL);
@@ -1357,9 +1385,9 @@ static void recv_generator(char *fname, 
 			 && BITS_EQUAL(sx.st.st_mode, file->mode, _S_IFMT)
 			 && sx.st.st_rdev == rdev) {
 				/* The device or special file is identical. */
+				set_file_attrs(fname, file, &sx, NULL, maybe_ATTRS_REPORT);
 				if (itemizing)
 					itemize(fname, file, ndx, 0, &sx, 0, 0, NULL);
-				set_file_attrs(fname, file, &sx, maybe_ATTRS_REPORT);
 #ifdef SUPPORT_HARD_LINKS
 				if (preserve_hard_links && F_IS_HLINKED(file))
 					finish_hard_link(file, fname, &sx.st, itemizing, code, -1);
@@ -1399,7 +1427,7 @@ static void recv_generator(char *fname, 
 			rsyserr(FERROR, errno, "mknod %s failed",
 				full_fname(fname));
 		} else {
-			set_file_attrs(fname, file, NULL, 0);
+			set_file_attrs(fname, file, NULL, NULL, 0);
 			if (itemizing) {
 				itemize(fname, file, ndx, statret, &sx,
 					ITEM_LOCAL_CHANGE, 0, NULL);
@@ -1529,9 +1557,9 @@ static void recv_generator(char *fname, 
 			do_unlink(partialptr);
 			handle_partial_dir(partialptr, PDIR_DELETE);
 		}
+		set_file_attrs(fname, file, &sx, NULL, maybe_ATTRS_REPORT);
 		if (itemizing)
 			itemize(fnamecmp, file, ndx, statret, &sx, 0, 0, NULL);
-		set_file_attrs(fname, file, &sx, maybe_ATTRS_REPORT);
 #ifdef SUPPORT_HARD_LINKS
 		if (preserve_hard_links && F_IS_HLINKED(file))
 			finish_hard_link(file, fname, &sx.st, itemizing, code, -1);
@@ -1636,6 +1664,10 @@ static void recv_generator(char *fname, 
 		if (preserve_acls)
 			free_acl(&real_sx);
 #endif
+#ifdef SUPPORT_XATTRS
+		if (preserve_xattrs)
+			free_xattr(&real_sx);
+#endif
 	}
 
 	if (!do_xfers) {
@@ -1657,7 +1689,7 @@ static void recv_generator(char *fname, 
 
 	if (f_copy >= 0) {
 		close(f_copy);
-		set_file_attrs(backupptr, back_file, NULL, 0);
+		set_file_attrs(backupptr, back_file, NULL, NULL, 0);
 		if (verbose > 1) {
 			rprintf(FINFO, "backed up %s to %s\n",
 				fname, backupptr);
@@ -1672,6 +1704,10 @@ static void recv_generator(char *fname, 
 	if (preserve_acls)
 		free_acl(&sx);
 #endif
+#ifdef SUPPORT_XATTRS
+	if (preserve_xattrs)
+		free_xattr(&sx);
+#endif
 	return;
 }
 
--- old/lib/sysxattrs.c
+++ new/lib/sysxattrs.c
@@ -0,0 +1,135 @@
+/*
+ * Extended attribute support for rsync.
+ *
+ * Copyright (C) 2004 Red Hat, Inc.
+ * Written by Jay Fenlason.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include "rsync.h"
+#include "sysxattrs.h"
+
+#ifdef SUPPORT_XATTRS
+
+#if defined HAVE_LINUX_XATTRS
+
+ssize_t sys_lgetxattr(const char *path, const char *name, void *value, size_t size)
+{
+	return lgetxattr(path, name, value, size);
+}
+
+ssize_t sys_fgetxattr(int filedes, const char *name, void *value, size_t size)
+{
+	return fgetxattr(filedes, name, value, size);
+}
+
+int sys_lsetxattr(const char *path, const char *name, const void *value, size_t size)
+{
+	return lsetxattr(path, name, value, size, 0);
+}
+
+int sys_lremovexattr(const char *path, const char *name)
+{
+	return lremovexattr(path, name);
+}
+
+ssize_t sys_llistxattr(const char *path, char *list, size_t size)
+{
+	return llistxattr(path, list, size);
+}
+
+#elif HAVE_OSX_XATTRS
+
+ssize_t sys_lgetxattr(const char *path, const char *name, void *value, size_t size)
+{
+	return getxattr(path, name, value, size, 0, XATTR_NOFOLLOW);
+}
+
+ssize_t sys_fgetxattr(int filedes, const char *name, void *value, size_t size)
+{
+	return fgetxattr(filedes, name, value, size, 0, 0);
+}
+
+int sys_lsetxattr(const char *path, const char *name, const void *value, size_t size)
+{
+	return setxattr(path, name, value, size, 0, XATTR_NOFOLLOW);
+}
+
+int sys_lremovexattr(const char *path, const char *name)
+{
+	return removexattr(path, name, XATTR_NOFOLLOW);
+}
+
+ssize_t sys_llistxattr(const char *path, char *list, size_t size)
+{
+	return listxattr(path, list, size, XATTR_NOFOLLOW);
+}
+
+#elif HAVE_FREEBSD_XATTRS
+
+ssize_t sys_lgetxattr(const char *path, const char *name, void *value, size_t size)
+{
+	return extattr_get_link(path, EXTATTR_NAMESPACE_USER, name, value, size);
+}
+
+ssize_t sys_fgetxattr(int filedes, const char *name, void *value, size_t size)
+{
+	return extattr_get_fd(filedes, EXTATTR_NAMESPACE_USER, name, value, size);
+}
+
+int sys_lsetxattr(const char *path, const char *name, const void *value, size_t size)
+{
+	return extattr_set_link(path, EXTATTR_NAMESPACE_USER, name, value, size);
+}
+
+int sys_lremovexattr(const char *path, const char *name)
+{
+	return extattr_delete_link(path, EXTATTR_NAMESPACE_USER, name);
+}
+
+ssize_t sys_llistxattr(const char *path, char *list, size_t size)
+{
+	unsigned char keylen;
+	ssize_t off, len = extattr_list_link(path, EXTATTR_NAMESPACE_USER, list, size);
+
+	if (len <= 0 || (size_t)len > size)
+		return len;
+
+	/* FreeBSD puts a single-byte length before each string, with no '\0'
+	 * terminator.  We need to change this into a series of null-terminted
+	 * strings.  Since the size is the same, we can simply transform the
+	 * output in place. */
+	for (off = 0; off < len; off += keylen + 1) {
+		keylen = ((unsigned char*)list)[off];
+		if (off + keylen >= len) {
+			/* Should be impossible, but kernel bugs happen! */
+			errno = EINVAL;
+			return -1;
+		}
+		memmove(list+off, list+off+1, keylen);
+		list[off+keylen] = '\0';
+	}
+
+	return len;
+}
+
+#else
+
+#error You need to create xattr compatibility functions.
+
+#endif
+
+#endif /* SUPPORT_XATTRS */
--- old/lib/sysxattrs.h
+++ new/lib/sysxattrs.h
@@ -0,0 +1,26 @@
+#ifdef SUPPORT_XATTRS
+
+#if defined HAVE_ATTR_XATTR_H
+#include <attr/xattr.h>
+#elif defined HAVE_SYS_XATTR_H
+#include <sys/xattr.h>
+#elif defined HAVE_SYS_EXTATTR_H
+#include <sys/extattr.h>
+#endif
+
+/* Linux 2.4 does not define this as a distinct errno value: */
+#ifndef ENOATTR
+#define ENOATTR ENODATA
+#endif
+
+ssize_t sys_lgetxattr(const char *path, const char *name, void *value, size_t size);
+ssize_t sys_fgetxattr(int filedes, const char *name, void *value, size_t size);
+int sys_lsetxattr(const char *path, const char *name, const void *value, size_t size);
+int sys_lremovexattr(const char *path, const char *name);
+ssize_t sys_llistxattr(const char *path, char *list, size_t size);
+
+#else
+
+/* No xattrs available */
+
+#endif
--- old/main.c
+++ new/main.c
@@ -608,7 +608,7 @@ static void fix_basis_dirs(void)
 }
 
 /* This is only called by the sender. */
-static void read_final_goodbye(int f_in, int f_out)
+static void read_final_goodbye(int f_in)
 {
 	int i, iflags, xlen;
 	uchar fnamecmp_type;
@@ -617,8 +617,8 @@ static void read_final_goodbye(int f_in,
 	if (protocol_version < 29)
 		i = read_int(f_in);
 	else {
-		i = read_ndx_and_attrs(f_in, f_out, &iflags,
-				       &fnamecmp_type, xname, &xlen);
+		i = read_ndx_and_attrs(f_in, &iflags, &fnamecmp_type,
+				       xname, &xlen);
 	}
 
 	if (i != NDX_DONE) {
@@ -677,7 +677,7 @@ static void do_server_sender(int f_in, i
 	io_flush(FULL_FLUSH);
 	handle_stats(f_out);
 	if (protocol_version >= 24)
-		read_final_goodbye(f_in, f_out);
+		read_final_goodbye(f_in);
 	io_flush(FULL_FLUSH);
 	exit_cleanup(0);
 }
@@ -740,7 +740,7 @@ static int do_recv(int f_in, int f_out, 
 			kluge_around_eof = -1;
 
 			/* This should only get stopped via a USR2 signal. */
-			read_ndx_and_attrs(f_in, -1, &iflags, &fnamecmp_type,
+			read_ndx_and_attrs(f_in, &iflags, &fnamecmp_type,
 					   xname, &xlen);
 
 			rprintf(FERROR, "Invalid packet at end of run [%s]\n",
@@ -977,7 +977,7 @@ int client_run(int f_in, int f_out, pid_
 		io_flush(FULL_FLUSH);
 		handle_stats(-1);
 		if (protocol_version >= 24)
-			read_final_goodbye(f_in, f_out);
+			read_final_goodbye(f_in);
 		if (pid != -1) {
 			if (verbose > 3)
 				rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
--- old/options.c
+++ new/options.c
@@ -47,6 +47,7 @@ int copy_links = 0;
 int preserve_links = 0;
 int preserve_hard_links = 0;
 int preserve_acls = 0;
+int preserve_xattrs = 0;
 int preserve_perms = 0;
 int preserve_executability = 0;
 int preserve_devices = 0;
@@ -201,6 +202,7 @@ static void print_rsync_version(enum log
 	char const *have_inplace = "no ";
 	char const *hardlinks = "no ";
 	char const *acls = "no ";
+	char const *xattrs = "no ";
 	char const *links = "no ";
 	char const *ipv6 = "no ";
 	STRUCT_STAT *dumstat;
@@ -220,7 +222,9 @@ static void print_rsync_version(enum log
 #ifdef SUPPORT_ACLS
 	acls = "";
 #endif
-
+#ifdef SUPPORT_XATTRS
+	xattrs = "";
+#endif
 #ifdef SUPPORT_LINKS
 	links = "";
 #endif
@@ -239,8 +243,8 @@ static void print_rsync_version(enum log
 		(int)(sizeof (int64) * 8));
 	rprintf(f, "    %ssocketpairs, %shardlinks, %ssymlinks, %sIPv6, batchfiles, %sinplace,\n",
 		got_socketpair, hardlinks, links, ipv6, have_inplace);
-	rprintf(f, "    %sappend, %sACLs\n",
-		have_inplace, acls);
+	rprintf(f, "    %sappend, %sACLs, %sxattrs\n",
+		have_inplace, acls, xattrs);
 
 #ifdef MAINTAINER_MODE
 	rprintf(f, "Panic Action: \"%s\"\n", get_panic_action());
@@ -286,7 +290,7 @@ void usage(enum logcode F)
   rprintf(F," -q, --quiet                 suppress non-error messages\n");
   rprintf(F,"     --no-motd               suppress daemon-mode MOTD (see manpage caveat)\n");
   rprintf(F," -c, --checksum              skip based on checksum, not mod-time & size\n");
-  rprintf(F," -a, --archive               archive mode; same as -rlptgoD (no -H, -A)\n");
+  rprintf(F," -a, --archive               archive mode; equals -rlptgoD (no -H,-A,-X)\n");
   rprintf(F,"     --no-OPTION             turn off an implied OPTION (e.g. --no-D)\n");
   rprintf(F," -r, --recursive             recurse into directories\n");
   rprintf(F," -R, --relative              use relative path names\n");
@@ -311,6 +315,9 @@ void usage(enum logcode F)
 #ifdef SUPPORT_ACLS
   rprintf(F," -A, --acls                  preserve ACLs (implies --perms)\n");
 #endif
+#ifdef SUPPORT_XATTRS
+  rprintf(F," -X, --xattrs                preserve extended attributes (implies --perms)\n");
+#endif
   rprintf(F," -o, --owner                 preserve owner (super-user only)\n");
   rprintf(F," -g, --group                 preserve group\n");
   rprintf(F,"     --devices               preserve device files (super-user only)\n");
@@ -438,6 +445,9 @@ static struct poptOption long_options[] 
   {"acls",            'A', POPT_ARG_NONE,   0, 'A', 0, 0 },
   {"no-acls",          0,  POPT_ARG_VAL,    &preserve_acls, 0, 0, 0 },
   {"no-A",             0,  POPT_ARG_VAL,    &preserve_acls, 0, 0, 0 },
+  {"xattrs",          'X', POPT_ARG_NONE,   0, 'X', 0, 0 },
+  {"no-xattrs",        0,  POPT_ARG_VAL,    &preserve_xattrs, 0, 0, 0 },
+  {"no-X",             0,  POPT_ARG_VAL,    &preserve_xattrs, 0, 0, 0 },
   {"times",           't', POPT_ARG_VAL,    &preserve_times, 1, 0, 0 },
   {"no-times",         0,  POPT_ARG_VAL,    &preserve_times, 0, 0, 0 },
   {"no-t",             0,  POPT_ARG_VAL,    &preserve_times, 0, 0, 0 },
@@ -1126,6 +1136,17 @@ int parse_arguments(int *argc, const cha
 			return 0;
 #endif
 
+		case 'X':
+#ifdef SUPPORT_XATTRS
+			preserve_xattrs = 1;
+			preserve_perms = 1;
+			break;
+#else
+			snprintf(err_buf,sizeof(err_buf),
+				 "extended attributes are not supported on this %s\n",
+				 am_server ? "server" : "client");
+			return 0;
+#endif
 
 		default:
 			/* A large opt value means that set_refuse_options()
@@ -1590,6 +1611,10 @@ void server_options(char **args,int *arg
 	if (preserve_acls)
 		argstr[x++] = 'A';
 #endif
+#ifdef SUPPORT_XATTRS
+	if (preserve_xattrs)
+		argstr[x++] = 'X';
+#endif
 	if (recurse)
 		argstr[x++] = 'r';
 	if (always_checksum)
--- old/receiver.c
+++ new/receiver.c
@@ -22,6 +22,7 @@
 #include "rsync.h"
 
 extern int verbose;
+extern int dry_run;
 extern int do_xfers;
 extern int am_server;
 extern int do_progress;
@@ -37,6 +38,7 @@ extern int protocol_version;
 extern int relative_paths;
 extern int preserve_hard_links;
 extern int preserve_perms;
+extern int preserve_xattrs;
 extern int basis_dir_cnt;
 extern int make_backups;
 extern int cleanup_got_literal;
@@ -366,8 +368,8 @@ int recv_files(int f_in, char *local_nam
 		cleanup_disable();
 
 		/* This call also sets cur_flist. */
-		ndx = read_ndx_and_attrs(f_in, -1, &iflags,
-					 &fnamecmp_type, xname, &xlen);
+		ndx = read_ndx_and_attrs(f_in, &iflags, &fnamecmp_type,
+					 xname, &xlen);
 		if (ndx == NDX_DONE) {
 			if (inc_recurse && first_flist) {
 				flist_free(first_flist);
@@ -397,8 +399,17 @@ int recv_files(int f_in, char *local_nam
 		if (verbose > 2)
 			rprintf(FINFO, "recv_files(%s)\n", fname);
 
+#ifdef SUPPORT_XATTRS
+		if (iflags & ITEM_REPORT_XATTR && !dry_run)
+			recv_xattr_request(file, f_in);
+#endif
+
 		if (!(iflags & ITEM_TRANSFER)) {
 			maybe_log_item(file, iflags, itemizing, xname);
+#ifdef SUPPORT_XATTRS
+			if (preserve_xattrs && iflags & ITEM_REPORT_XATTR && !dry_run)
+				set_file_attrs(fname, file, NULL, fname, 0);
+#endif
 			continue;
 		}
 		if (phase == 2) {
@@ -655,15 +666,15 @@ int recv_files(int f_in, char *local_nam
 				temp_copy_name = NULL;
 			else
 				temp_copy_name = partialptr;
-			finish_transfer(fname, fnametmp, temp_copy_name,
-					file, recv_ok, 1);
+			finish_transfer(fname, fnametmp, fnamecmp,
+					temp_copy_name, file, recv_ok, 1);
 			if (fnamecmp == partialptr) {
 				do_unlink(partialptr);
 				handle_partial_dir(partialptr, PDIR_DELETE);
 			}
 		} else if (keep_partial && partialptr
 		    && handle_partial_dir(partialptr, PDIR_CREATE)) {
-			finish_transfer(partialptr, fnametmp, NULL,
+			finish_transfer(partialptr, fnametmp, fnamecmp, NULL,
 					file, recv_ok, !partial_dir);
 			if (delay_updates && recv_ok) {
 				bitbag_set_bit(delayed_bits, ndx);
--- old/rsync.c
+++ new/rsync.c
@@ -32,6 +32,7 @@
 extern int verbose;
 extern int dry_run;
 extern int preserve_acls;
+extern int preserve_xattrs;
 extern int preserve_perms;
 extern int preserve_executability;
 extern int preserve_times;
@@ -91,10 +92,8 @@ void setup_iconv()
 }
 #endif
 
-/* This is used by sender.c with a valid f_out, and by receive.c with
- * f_out = -1. */
-int read_ndx_and_attrs(int f_in, int f_out, int *iflag_ptr,
-		       uchar *type_ptr, char *buf, int *len_ptr)
+int read_ndx_and_attrs(int f_in, int *iflag_ptr, uchar *type_ptr,
+		       char *buf, int *len_ptr)
 {
 	int len, iflags = 0;
 	struct file_list *flist;
@@ -181,11 +180,6 @@ int read_ndx_and_attrs(int f_in, int f_o
 				ndx, who_am_i());
 			exit_cleanup(RERR_PROTOCOL);
 		}
-	} else if (f_out >= 0) {
-		if (inc_recurse)
-			send_extra_file_list(f_out, FILECNT_LOOKAHEAD);
-		write_ndx_and_attrs(f_out, ndx, iflags,
-				    fnamecmp_type, buf, len);
 	}
 
 	*iflag_ptr = iflags;
@@ -228,8 +222,8 @@ mode_t dest_mode(mode_t flist_mode, mode
 	return new_mode;
 }
 
-int set_file_attrs(char *fname, struct file_struct *file, statx *sxp,
-		   int flags)
+int set_file_attrs(const char *fname, struct file_struct *file, statx *sxp,
+		   const char *fnamecmp, int flags)
 {
 	int updated = 0;
 	statx sx2;
@@ -247,6 +241,9 @@ int set_file_attrs(char *fname, struct f
 #ifdef SUPPORT_ACLS
 		sx2.acc_acl = sx2.def_acl = NULL;
 #endif
+#ifdef SUPPORT_XATTRS
+		sx2.xattr = NULL;
+#endif
 		if (!preserve_perms && S_ISDIR(new_mode)
 		 && sx2.st.st_mode & S_ISGID) {
 			/* We just created this directory and its setgid
@@ -321,6 +318,10 @@ int set_file_attrs(char *fname, struct f
 	if (daemon_chmod_modes && !S_ISLNK(new_mode))
 		new_mode = tweak_mode(new_mode, daemon_chmod_modes);
 
+#ifdef SUPPORT_XATTRS
+	if (preserve_xattrs && fnamecmp)
+		set_xattr(fname, file, fnamecmp);
+#endif
 #ifdef SUPPORT_ACLS
 	/* It's OK to call set_acl() now, even for a dir, as the generator
 	 * will enable owner-writability using chmod, if necessary.
@@ -353,10 +354,16 @@ int set_file_attrs(char *fname, struct f
 			rprintf(FCLIENT, "%s is uptodate\n", fname);
 	}
   cleanup:
+	if (sxp == &sx2) {
 #ifdef SUPPORT_ACLS
-	if (preserve_acls && sxp == &sx2)
-		free_acl(&sx2);
+		if (preserve_acls)
+			free_acl(&sx2);
+#endif
+#ifdef SUPPORT_XATTRS
+		if (preserve_xattrs)
+			free_xattr(&sx2);
 #endif
+	}
 	return updated;
 }
 
@@ -378,7 +385,8 @@ RETSIGTYPE sig_int(UNUSED(int val))
  * attributes (e.g. permissions, ownership, etc.).  If partialptr is not
  * NULL and the robust_rename() call is forced to copy the temp file, we
  * stage the file into the partial-dir and then rename it into place. */
-void finish_transfer(char *fname, char *fnametmp, char *partialptr,
+void finish_transfer(const char *fname, const char *fnametmp,
+		     const char *fnamecmp, const char *partialptr,
 		     struct file_struct *file, int ok_to_set_time,
 		     int overwriting_basis)
 {
@@ -395,7 +403,7 @@ void finish_transfer(char *fname, char *
 		return;
 
 	/* Change permissions before putting the file into place. */
-	set_file_attrs(fnametmp, file, NULL,
+	set_file_attrs(fnametmp, file, NULL, fnamecmp,
 		       ok_to_set_time ? 0 : ATTRS_SKIP_MTIME);
 
 	/* move tmp file over real file */
@@ -419,7 +427,7 @@ void finish_transfer(char *fname, char *
 	fnametmp = partialptr ? partialptr : fname;
 
   do_set_file_attrs:
-	set_file_attrs(fnametmp, file, NULL,
+	set_file_attrs(fnametmp, file, NULL, fnamecmp,
 		       ok_to_set_time ? 0 : ATTRS_SKIP_MTIME);
 
 	if (partialptr) {
--- old/rsync.h
+++ new/rsync.h
@@ -569,6 +569,7 @@ extern int file_extra_cnt;
 extern int preserve_uid;
 extern int preserve_gid;
 extern int preserve_acls;
+extern int preserve_xattrs;
 
 #define FILE_STRUCT_LEN (offsetof(struct file_struct, basename))
 #define EXTRA_LEN (sizeof (union file_extras))
@@ -601,7 +602,8 @@ extern int preserve_acls;
 /* When the associated option is on, all entries will have these present: */
 #define F_OWNER(f) REQ_EXTRA(f, preserve_uid)->unum
 #define F_GROUP(f) REQ_EXTRA(f, preserve_gid)->unum
-#define F_ACL(f) REQ_EXTRA(f, preserve_acls)->unum
+#define F_ACL(f) REQ_EXTRA(f, preserve_acls)->num
+#define F_XATTR(f) REQ_EXTRA(f, preserve_xattrs)->num
 
 /* These items are per-entry optional and mutally exclusive: */
 #define F_HL_GNUM(f) OPT_EXTRA(f, LEN64_BUMP(f))->num
@@ -793,9 +795,13 @@ typedef struct {
     struct rsync_acl *acc_acl; /* access ACL */
     struct rsync_acl *def_acl; /* default ACL */
 #endif
+#ifdef SUPPORT_XATTRS
+    item_list *xattr;
+#endif
 } statx;
 
 #define ACL_READY(sx) ((sx).acc_acl != NULL)
+#define XATTR_READY(sx) ((sx).xattr != NULL)
 
 #include "proto.h"
 
--- old/rsync.yo
+++ new/rsync.yo
@@ -301,7 +301,7 @@ to the detailed description below for a 
  -q, --quiet                 suppress non-error messages
      --no-motd               suppress daemon-mode MOTD (see caveat)
  -c, --checksum              skip based on checksum, not mod-time & size
- -a, --archive               archive mode; same as -rlptgoD (no -H, -A)
+ -a, --archive               archive mode; equals -rlptgoD (no -H,-A,-X)
      --no-OPTION             turn off an implied OPTION (e.g. --no-D)
  -r, --recursive             recurse into directories
  -R, --relative              use relative path names
@@ -324,6 +324,7 @@ to the detailed description below for a 
  -E, --executability         preserve executability
      --chmod=CHMOD           affect file and/or directory permissions
  -A, --acls                  preserve ACLs (implies -p)
+ -X, --xattrs                preserve extended attrs (implies -p)
  -o, --owner                 preserve owner (super-user only)
  -g, --group                 preserve group
      --devices               preserve device files (super-user only)
@@ -831,6 +832,11 @@ dit(bf(-A, --acls)) This option causes r
 ACLs to be the same as the source ACLs.  This nonstandard option only
 works if the remote rsync also supports it.  bf(--acls) implies bf(--perms).
 
+dit(bf(-X, --xattrs)) This option causes rsync to update the remote
+extended attributes to be the same as the local ones.  This will work
+only if the remote machine's rsync supports this option also. This is
+a non-standard option.
+
 dit(bf(--chmod)) This option tells rsync to apply one or more
 comma-separated "chmod" strings to the permission of the files in the
 transfer.  The resulting value is treated as though it was the permissions
--- old/sender.c
+++ new/sender.c
@@ -22,6 +22,7 @@
 #include "rsync.h"
 
 extern int verbose;
+extern int dry_run;
 extern int do_xfers;
 extern int am_server;
 extern int am_daemon;
@@ -144,8 +145,9 @@ void successful_send(int ndx)
 		rsyserr(FERROR, errno, "sender failed to remove %s", fname);
 }
 
-void write_ndx_and_attrs(int f_out, int ndx, int iflags,
-			 uchar fnamecmp_type, char *buf, int len)
+static void write_ndx_and_attrs(int f_out, int ndx, int iflags,
+				const char *fname, struct file_struct *file,
+				uchar fnamecmp_type, char *buf, int len)
 {
 	write_ndx(f_out, ndx);
 	if (protocol_version < 29)
@@ -155,6 +157,10 @@ void write_ndx_and_attrs(int f_out, int 
 		write_byte(f_out, fnamecmp_type);
 	if (iflags & ITEM_XNAME_FOLLOWS)
 		write_vstring(f_out, buf, len);
+#ifdef SUPPORT_XATTRS
+	if (iflags & ITEM_REPORT_XATTR && !dry_run)
+		send_xattr_request(fname, file, f_out);
+#endif
 }
 
 void send_files(int f_in, int f_out)
@@ -183,8 +189,8 @@ void send_files(int f_in, int f_out)
 			send_extra_file_list(f_out, FILECNT_LOOKAHEAD);
 
 		/* This call also sets cur_flist. */
-		ndx = read_ndx_and_attrs(f_in, f_out, &iflags,
-					 &fnamecmp_type, xname, &xlen);
+		ndx = read_ndx_and_attrs(f_in, &iflags, &fnamecmp_type,
+					 xname, &xlen);
 		if (ndx == NDX_DONE) {
 			if (inc_recurse && first_flist) {
 				flist_free(first_flist);
@@ -201,6 +207,9 @@ void send_files(int f_in, int f_out)
 			continue;
 		}
 
+		if (inc_recurse)
+			send_extra_file_list(f_out, FILECNT_LOOKAHEAD);
+
 		file = cur_flist->files[ndx - cur_flist->ndx_start];
 		if (F_ROOTDIR(file)) {
 			path = F_ROOTDIR(file);
@@ -215,8 +224,13 @@ void send_files(int f_in, int f_out)
 		if (verbose > 2)
 			rprintf(FINFO, "send_files(%d, %s%s%s)\n", ndx, path,slash,fname);
 
+		if (iflags & ITEM_REPORT_XATTR)
+			recv_xattr_request(file, f_in);
+
 		if (!(iflags & ITEM_TRANSFER)) {
 			maybe_log_item(file, iflags, itemizing, xname);
+			write_ndx_and_attrs(f_out, ndx, iflags, fname, file,
+					    fnamecmp_type, xname, xlen);
 			continue;
 		}
 		if (phase == 2) {
@@ -251,8 +265,8 @@ void send_files(int f_in, int f_out)
 
 		if (!do_xfers) { /* log the transfer */
 			log_item(FCLIENT, file, &stats, iflags, NULL);
-			write_ndx_and_attrs(f_out, ndx, iflags, fnamecmp_type,
-					    xname, xlen);
+			write_ndx_and_attrs(f_out, ndx, iflags, fname, file,
+					    fnamecmp_type, xname, xlen);
 			continue;
 		}
 
@@ -305,8 +319,8 @@ void send_files(int f_in, int f_out)
 				path,slash,fname, (double)st.st_size);
 		}
 
-		write_ndx_and_attrs(f_out, ndx, iflags, fnamecmp_type,
-				    xname, xlen);
+		write_ndx_and_attrs(f_out, ndx, iflags, fname, file,
+				    fnamecmp_type, xname, xlen);
 		write_sum_head(f_xfer, s);
 
 		if (verbose > 2)
--- old/testsuite/xattrs.test
+++ new/testsuite/xattrs.test
@@ -0,0 +1,76 @@
+#! /bin/sh
+
+# This program is distributable under the terms of the GNU GPL (see
+# COPYING).
+
+# Test that rsync handles basic xattr preservation.
+
+. $srcdir/testsuite/rsync.fns
+
+$RSYNC --version | grep ", xattrs" >/dev/null || test_skipped "Rsync is configured without xattr support"
+
+case "$RSYNC" in
+*protocol=29*) test_skipped "xattr support requires protocol 30" ;;
+esac
+
+makepath "$fromdir/foo"
+echo something >"$fromdir/file1"
+echo else >"$fromdir/file2"
+echo last >"$fromdir/foo/file3"
+
+makepath "$chkdir/foo"
+echo wow >"$chkdir/file1"
+cp -p "$fromdir/foo/file3" "$chkdir/foo"
+
+files='foo file1 file2 foo/file3'
+
+cd "$fromdir"
+
+setfattr -n user.short -v 'this is short' file1 2>/dev/null || test_skipped "Unable to set an xattr"
+setfattr -n user.long -v 'this is a long attribute that will be truncated in the initial data send' file1
+setfattr -n user.good -v 'this is good' file1
+setfattr -n user.nice -v 'this is nice' file1
+
+setfattr -n user.foo -v foo file2
+setfattr -n user.bar -v bar file2
+
+setfattr -n user.foo -v 'new foo' foo/file3
+setfattr -n user.bar -v 'new bar' foo/file3
+setfattr -n user.long -v 'this is also a long attribute that will be truncated in the initial data send' foo/file3
+setfattr -n user.equal -v 'this long attribute should remain the same and not need to be transferred' foo/file3
+
+setfattr -n user.short -v 'old short' "$chkdir/file1"
+setfattr -n user.extra -v 'remove me' "$chkdir/file1"
+
+setfattr -n user.foo -v 'old foo' "$chkdir/foo/file3"
+setfattr -n user.equal -v 'this long attribute should remain the same and not need to be transferred' "$chkdir/foo/file3"
+
+getfattr -d $files >"$scratchdir/xattrs.txt"
+
+# OK, let's try a simple xattr copy.
+checkit "$RSYNC -avX . \"$chkdir/\"" "$fromdir" "$chkdir"
+
+cd "$chkdir"
+getfattr -d $files | diff $diffopt "$scratchdir/xattrs.txt" -
+
+cd "$fromdir"
+
+checkit "$RSYNC -aiX --copy-dest=../chk . ../to" "$fromdir" "$todir"
+
+cd "$todir"
+getfattr -d $files | diff $diffopt "$scratchdir/xattrs.txt" -
+
+cd "$fromdir"
+setfattr -n user.nice -v 'this is nice, but different' file1
+
+getfattr -d $files >"$scratchdir/xattrs.txt"
+
+rm -rf "$todir"
+
+checkit "$RSYNC -aiX --link-dest=../chk . ../to" "$chkdir" "$todir"
+
+cd "$todir"
+getfattr -d $files | diff $diffopt "$scratchdir/xattrs.txt" -
+
+# The script would have aborted on error, so getting here means we've won.
+exit 0
--- old/xattrs.c
+++ new/xattrs.c
@@ -0,0 +1,769 @@
+/*
+ * Extended Attribute support for rsync.
+ * Written by Jay Fenlason, vaguely based on the ACLs patch.
+ *
+ * Copyright (C) 2004 Red Hat, Inc.
+ * Copyright (C) 2006, 2007 Wayne Davison
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include "rsync.h"
+#include "lib/sysxattrs.h"
+
+#ifdef SUPPORT_XATTRS
+
+extern int dry_run;
+extern int am_root;
+extern int am_sender;
+extern int am_generator;
+extern int read_only;
+extern int list_only;
+extern int checksum_seed;
+
+#define RSYNC_XAL_INITIAL 5
+#define RSYNC_XAL_LIST_INITIAL 100
+
+#define MAX_FULL_DATUM 32
+
+#define HAS_PREFIX(str, prfx) (*(str) == *(prfx) \
+			    && strncmp(str, prfx, sizeof (prfx) - 1) == 0)
+
+#define XATTR_ABBREV(x) ((size_t)((x).name - (x).datum) < (x).datum_len)
+
+#define XSTATE_ABBREV	0
+#define XSTATE_DONE	1
+#define XSTATE_TODO	2
+#define XSTATE_LOCAL	3
+
+#define USER_PREFIX "user."
+#define UPRE_LEN ((int)sizeof USER_PREFIX - 1)
+#define SYSTEM_PREFIX "system."
+#define SPRE_LEN ((int)sizeof SYSTEM_PREFIX - 1)
+
+#ifdef HAVE_LINUX_XATTRS
+#define RPRE_LEN 0
+#else
+#define RSYNC_PREFIX "rsync."
+#define RPRE_LEN ((int)sizeof RSYNC_PREFIX - 1)
+#endif
+
+typedef struct {
+	char *datum, *name;
+	size_t datum_len, name_len;
+} rsync_xa;
+
+static size_t namebuf_len = 0;
+static char *namebuf = NULL;
+
+static item_list empty_xattr = EMPTY_ITEM_LIST;
+static item_list rsync_xal_l = EMPTY_ITEM_LIST;
+
+/* ------------------------------------------------------------------------- */
+
+static void rsync_xal_free(item_list *xalp)
+{
+	size_t i;
+	rsync_xa *rxas = xalp->items;
+
+	for (i = 0; i < xalp->count; i++) {
+		free(rxas[i].datum);
+		/*free(rxas[i].name);*/
+	}
+	xalp->count = 0;
+}
+
+void free_xattr(statx *sxp)
+{
+	if (!sxp->xattr)
+		return;
+	rsync_xal_free(sxp->xattr);
+	free(sxp->xattr);
+	sxp->xattr = NULL;
+}
+
+static int rsync_xal_compare_names(const void *x1, const void *x2)
+{
+	const rsync_xa *xa1 = x1;
+	const rsync_xa *xa2 = x2;
+	return strcmp(xa1->name, xa2->name);
+}
+
+static ssize_t get_xattr_names(const char *fname)
+{
+	ssize_t list_len;
+
+	if (!namebuf) {
+		namebuf_len = 1024;
+		namebuf = new_array(char, namebuf_len);
+		if (!namebuf)
+			out_of_memory("get_xattr_names");
+	}
+
+	/* The length returned includes all the '\0' terminators. */
+	list_len = sys_llistxattr(fname, namebuf, namebuf_len);
+	if (list_len > (ssize_t)namebuf_len) {
+		list_len = -1;
+		errno = ERANGE;
+	}
+	if (list_len < 0) {
+		if (errno == ENOTSUP)
+			return 0;
+		if (errno == ERANGE) {
+			list_len = sys_llistxattr(fname, NULL, 0);
+			if (list_len < 0) {
+				rsyserr(FERROR, errno,
+					"get_xattr_names: llistxattr(\"%s\",0) failed",
+					fname);
+				return -1;
+			}
+			if (namebuf_len)
+				free(namebuf);
+			namebuf_len = list_len + 1024;
+			namebuf = new_array(char, namebuf_len);
+			if (!namebuf)
+				out_of_memory("get_xattr_names");
+			list_len = sys_llistxattr(fname, namebuf, namebuf_len);
+			if (list_len < 0) {
+				rsyserr(FERROR, errno,
+					"get_xattr_names: llistxattr(\"%s\",%ld) failed",
+					fname, (long)namebuf_len);
+				return -1;
+			}
+		} else {
+			rsyserr(FERROR, errno,
+				"get_xattr_names: llistxattr(\"%s\",%ld) failed",
+				fname, (long)namebuf_len);
+			return -1;
+		}
+	}
+
+	return list_len;
+}
+
+/* On entry, the *len_ptr parameter contains the size of the extra space we
+ * should allocate when we create a buffer for the data.  On exit, it contains
+ * the length of the datum. */
+static char *get_xattr_data(const char *fname, const char *name, size_t *len_ptr,
+			    int no_missing_error)
+{
+	size_t datum_len = sys_lgetxattr(fname, name, NULL, 0);
+	char *ptr;
+
+	if (datum_len == (size_t)-1) {
+		if (errno == ENOTSUP || no_missing_error)
+			return NULL;
+		rsyserr(FERROR, errno,
+			"get_xattr_data: lgetxattr(\"%s\",\"%s\",0) failed",
+			fname, name);
+		return NULL;
+	}
+
+	if (datum_len + *len_ptr < datum_len /* checks for overflow */
+	 || !(ptr = new_array(char, datum_len + *len_ptr)))
+		out_of_memory("get_xattr_data");
+
+	*len_ptr = datum_len;
+
+	if (datum_len) {
+		size_t len = sys_lgetxattr(fname, name, ptr, datum_len);
+		if (len != datum_len) {
+			if (len == (size_t)-1) {
+				rsyserr(FERROR, errno,
+				    "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)"
+				    " failed", fname, name, (long)datum_len);
+			} else {
+				rprintf(FERROR,
+				    "get_xattr_data: lgetxattr(\"%s\",\"%s\",%ld)"
+				    " returned %ld\n", fname, name,
+				    (long)datum_len, (long)len);
+			}
+			free(ptr);
+			return NULL;
+		}
+	}
+
+	return ptr;
+}
+
+static int rsync_xal_get(const char *fname, item_list *xalp)
+{
+	ssize_t list_len, name_len;
+	size_t datum_len, name_offset;
+	char *name, *ptr;
+	int user_only = am_sender ? 0 : !am_root;
+
+	/* This puts the name list into the "namebuf" buffer. */
+	if ((list_len = get_xattr_names(fname)) < 0)
+		return -1;
+
+	for (name = namebuf; list_len > 0; name += name_len) {
+		rsync_xa *rxas;
+
+		name_len = strlen(name) + 1;
+		list_len -= name_len;
+
+#ifdef HAVE_LINUX_XATTRS
+		/* We always ignore the system namespace, and non-root
+		 * ignores everything but the user namespace. */
+		if (user_only ? !HAS_PREFIX(name, USER_PREFIX)
+			      : HAS_PREFIX(name, SYSTEM_PREFIX))
+			continue;
+#endif
+
+		datum_len = name_len; /* Pass extra size to get_xattr_data() */
+		if (!(ptr = get_xattr_data(fname, name, &datum_len, 0)))
+			return -1;
+
+		if (datum_len > MAX_FULL_DATUM) {
+			/* For large datums, we store a flag and a checksum. */
+			name_offset = 1 + MAX_DIGEST_LEN;
+			sum_init(checksum_seed);
+			sum_update(ptr, datum_len);
+			free(ptr);
+
+			if (!(ptr = new_array(char, name_offset + name_len)))
+				out_of_memory("rsync_xal_get");
+			*ptr = XSTATE_ABBREV;
+			sum_end(ptr + 1);
+		} else
+			name_offset = datum_len;
+
+		rxas = EXPAND_ITEM_LIST(xalp, rsync_xa, RSYNC_XAL_INITIAL);
+		rxas->name = ptr + name_offset;
+		memcpy(rxas->name, name, name_len);
+		rxas->datum = ptr;
+		rxas->name_len = name_len;
+		rxas->datum_len = datum_len;
+	}
+	if (xalp->count > 1)
+		qsort(xalp->items, xalp->count, sizeof (rsync_xa), rsync_xal_compare_names);
+	return 0;
+}
+
+/* Read the xattr(s) for this filename. */
+int get_xattr(const char *fname, statx *sxp)
+{
+	sxp->xattr = new(item_list);
+	*sxp->xattr = empty_xattr;
+	if (rsync_xal_get(fname, sxp->xattr) < 0) {
+		free_xattr(sxp);
+		return -1;
+	}
+	return 0;
+}
+
+static int find_matching_xattr(item_list *xalp)
+{
+	size_t i, j;
+	item_list *lst = rsync_xal_l.items;
+
+	for (i = 0; i < rsync_xal_l.count; i++) {
+		rsync_xa *rxas1 = lst[i].items;
+		rsync_xa *rxas2 = xalp->items;
+
+		/* Wrong number of elements? */
+		if (lst[i].count != xalp->count)
+			continue;
+		/* any elements different? */
+		for (j = 0; j < xalp->count; j++) {
+			if (rxas1[j].name_len != rxas2[j].name_len
+			 || rxas1[j].datum_len != rxas2[j].datum_len
+			 || strcmp(rxas1[j].name, rxas2[j].name))
+				break;
+			if (rxas1[j].datum_len > MAX_FULL_DATUM) {
+				if (memcmp(rxas1[j].datum + 1,
+					   rxas2[j].datum + 1,
+					   MAX_DIGEST_LEN) != 0)
+					break;
+			} else {
+				if (memcmp(rxas1[j].datum, rxas2[j].datum,
+					   rxas2[j].datum_len))
+					break;
+			}
+		}
+		/* no differences found.  This is The One! */
+		if (j == xalp->count)
+			return i;
+	}
+
+	return -1;
+}
+
+/* Store *xalp on the end of rsync_xal_l */
+static void rsync_xal_store(item_list *xalp)
+{
+	item_list *new_lst = EXPAND_ITEM_LIST(&rsync_xal_l, item_list, RSYNC_XAL_LIST_INITIAL);
+	/* Since the following call starts a new list, we know it will hold the
+	 * entire initial-count, not just enough space for one new item. */
+	*new_lst = empty_xattr;
+	(void)EXPAND_ITEM_LIST(new_lst, rsync_xa, xalp->count);
+	memcpy(new_lst->items, xalp->items, xalp->count * sizeof (rsync_xa));
+	new_lst->count = xalp->count;
+	xalp->count = 0;
+}
+
+/* Send the make_xattr()-generated xattr list for this flist entry. */
+int send_xattr(statx *sxp, int f)
+{
+	int ndx = find_matching_xattr(sxp->xattr);
+
+	/* Send 0 (-1 + 1) to indicate that literal xattr data follows. */
+	write_abbrevint(f, ndx + 1);
+
+	if (ndx < 0) {
+		rsync_xa *rxa;
+		int count = sxp->xattr->count;
+		write_abbrevint(f, count);
+		for (rxa = sxp->xattr->items; count--; rxa++) {
+#ifdef HAVE_LINUX_XATTRS
+			write_abbrevint(f, rxa->name_len);
+			write_abbrevint(f, rxa->datum_len);
+			write_buf(f, rxa->name, rxa->name_len);
+#else
+			/* We strip the rsync prefix from disguised namespaces
+			 * and put everything else in the user namespace. */
+			if (HAS_PREFIX(rxa->name, RSYNC_PREFIX)
+			 && rxa->name[RPRE_LEN] != '%') {
+				write_abbrevint(f, rxa->name_len - RPRE_LEN);
+				write_abbrevint(f, rxa->datum_len);
+				write_buf(f, rxa->name + RPRE_LEN, rxa->name_len - RPRE_LEN);
+			} else {
+				write_abbrevint(f, rxa->name_len + UPRE_LEN);
+				write_abbrevint(f, rxa->datum_len);
+				write_buf(f, USER_PREFIX, UPRE_LEN);
+				write_buf(f, rxa->name, rxa->name_len);
+			}
+#endif
+			if (rxa->datum_len > MAX_FULL_DATUM)
+				write_buf(f, rxa->datum + 1, MAX_DIGEST_LEN);
+			else
+				write_buf(f, rxa->datum, rxa->datum_len);
+		}
+		ndx = rsync_xal_l.count; /* pre-incremented count */
+		rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
+	}
+
+	return ndx;
+}
+
+/* Return a flag indicating if we need to change a file's xattrs.  If
+ * "find_all" is specified, also mark any abbreviated xattrs that we
+ * need so that send_xattr_request() can tell the sender about them. */
+int xattr_diff(struct file_struct *file, statx *sxp, int find_all)
+{
+	item_list *lst = rsync_xal_l.items;
+	rsync_xa *snd_rxa, *rec_rxa;
+	int snd_cnt, rec_cnt;
+	int cmp, same, xattrs_equal = 1;
+
+	if (!XATTR_READY(*sxp)) {
+		rec_rxa = NULL;
+		rec_cnt = 0;
+	} else {
+		rec_rxa = sxp->xattr->items;
+		rec_cnt = sxp->xattr->count;
+	}
+
+	if (F_XATTR(file) >= 0)
+		lst += F_XATTR(file);
+	else
+		lst = &empty_xattr;
+
+	snd_rxa = lst->items;
+	snd_cnt = lst->count;
+
+	/* If the count of the sender's xattrs is different from our
+	 * (receiver's) xattrs, the lists are not the same. */
+	if (snd_cnt != rec_cnt) {
+		if (!find_all)
+			return 1;
+		xattrs_equal = 0;
+	}
+
+	while (snd_cnt) {
+		cmp = rec_cnt ? strcmp(snd_rxa->name, rec_rxa->name) : -1;
+		if (cmp > 0)
+			same = 0;
+		else if (snd_rxa->datum_len > MAX_FULL_DATUM) {
+			same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
+			    && memcmp(snd_rxa->datum + 1, rec_rxa->datum + 1,
+				      MAX_DIGEST_LEN) == 0;
+			/* Flag unrequested items that we need. */
+			if (!same && find_all && snd_rxa->datum[0] == XSTATE_ABBREV)
+				snd_rxa->datum[0] = XSTATE_TODO;
+		} else {
+			same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
+			    && memcmp(snd_rxa->datum, rec_rxa->datum,
+				      snd_rxa->datum_len) == 0;
+		}
+		if (!same) {
+			if (!find_all)
+				return 1;
+			xattrs_equal = 0;
+		}
+
+		if (cmp <= 0) {
+			snd_rxa++;
+			snd_cnt--;
+		}
+		if (cmp >= 0) {
+			rec_rxa++;
+			rec_cnt--;
+		}
+	}
+
+	if (rec_cnt)
+		xattrs_equal = 0;
+
+	return !xattrs_equal;
+}
+
+/* When called by the generator with a NULL fname, this tells the sender
+ * which abbreviated xattr values we need.  When called by the sender
+ * (with a non-NULL fname), we send all the extra xattr data it needs. */
+void send_xattr_request(const char *fname, struct file_struct *file, int f_out)
+{
+	item_list *lst = rsync_xal_l.items;
+	int j, cnt, prior_req = -1;
+	rsync_xa *rxa;
+
+	lst += F_XATTR(file);
+	cnt = lst->count;
+	for (rxa = lst->items, j = 0; j < cnt; rxa++, j++) {
+		if (rxa->datum_len <= MAX_FULL_DATUM)
+			continue;
+		switch (rxa->datum[0]) {
+		case XSTATE_LOCAL:
+			/* Items set locally will get cached by receiver. */
+			rxa->datum[0] = XSTATE_DONE;
+			continue;
+		case XSTATE_TODO:
+			break;
+		default:
+			continue;
+		}
+
+		/* Flag that we handled this abbreviated item. */
+		rxa->datum[0] = XSTATE_DONE;
+
+		write_abbrevint(f_out, j - prior_req);
+		prior_req = j;
+
+		if (fname) {
+			size_t len = 0;
+			char *ptr;
+
+			/* Re-read the long datum. */
+			if (!(ptr = get_xattr_data(fname, rxa->name, &len, 0)))
+				continue;
+
+			write_abbrevint(f_out, len); /* length might have changed! */
+			write_buf(f_out, ptr, len);
+			free(ptr);
+		}
+	}
+
+	write_byte(f_out, 0); /* end the list */
+}
+
+/* Any items set locally by the generator that the receiver doesn't
+ * get told about get changed back to XSTATE_ABBREV. */
+void xattr_clear_locals(struct file_struct *file)
+{
+	item_list *lst = rsync_xal_l.items;
+	rsync_xa *rxa;
+	int cnt;
+
+	if (F_XATTR(file) < 0)
+		return;
+
+	lst += F_XATTR(file);
+	cnt = lst->count;
+	for (rxa = lst->items; cnt--; rxa++) {
+		if (rxa->datum_len <= MAX_FULL_DATUM)
+			continue;
+		if (rxa->datum[0] == XSTATE_LOCAL)
+			rxa->datum[0] = XSTATE_ABBREV;
+	}
+}
+
+/* When called by the sender, read the request from the generator and mark
+ * any needed xattrs with a flag that lets us know they need to be sent to
+ * the receiver.  When called by the receiver, reads the sent data and
+ * stores it in place of its checksum. */
+void recv_xattr_request(struct file_struct *file, int f_in)
+{
+	item_list *lst = rsync_xal_l.items;
+	char *old_datum, *name;
+	rsync_xa *rxa;
+	int rel_pos, cnt;
+
+	if (F_XATTR(file) < 0)
+		exit_cleanup(RERR_STREAMIO); /* XXX */
+	lst += F_XATTR(file);
+
+	cnt = lst->count;
+	rxa = lst->items;
+	rxa -= 1;
+	while ((rel_pos = read_abbrevint(f_in)) != 0) {
+		rxa += rel_pos;
+		cnt -= rel_pos;
+		if (cnt < 0 || rxa->datum_len <= MAX_FULL_DATUM
+		 || rxa->datum[0] != XSTATE_ABBREV)
+			exit_cleanup(RERR_STREAMIO); /* XXX */
+
+		if (am_sender) {
+			rxa->datum[0] = XSTATE_TODO;
+			continue;
+		}
+
+		old_datum = rxa->datum;
+		rxa->datum_len = read_abbrevint(f_in);
+
+		if (rxa->name_len + rxa->datum_len < rxa->name_len)
+			out_of_memory("recv_xattr_request"); /* overflow */
+		rxa->datum = new_array(char, rxa->datum_len + rxa->name_len);
+		if (!rxa->datum)
+			out_of_memory("recv_xattr_request");
+		name = rxa->datum + rxa->datum_len;
+		memcpy(name, rxa->name, rxa->name_len);
+		rxa->name = name;
+		free(old_datum);
+		read_buf(f_in, rxa->datum, rxa->datum_len);
+	}
+}
+
+/* ------------------------------------------------------------------------- */
+
+/* receive and build the rsync_xattr_lists */
+void receive_xattr(struct file_struct *file, int f)
+{
+	static item_list temp_xattr = EMPTY_ITEM_LIST;
+	int count;
+	int ndx = read_abbrevint(f);
+
+	if (ndx < 0 || (size_t)ndx > rsync_xal_l.count) {
+		rprintf(FERROR, "receive_xattr: xa index %d out of"
+			" range for %s\n", ndx, f_name(file, NULL));
+		exit_cleanup(RERR_STREAMIO);
+	}
+
+	if (ndx != 0) {
+		F_XATTR(file) = ndx - 1;
+		return;
+	}
+	
+	if ((count = read_abbrevint(f)) != 0) {
+		(void)EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, count);
+		temp_xattr.count = 0;
+	}
+
+	while (count--) {
+		char *ptr, *name;
+		rsync_xa *rxa;
+		size_t name_len = read_abbrevint(f);
+		size_t datum_len = read_abbrevint(f);
+		size_t dget_len = datum_len > MAX_FULL_DATUM ? 1 + MAX_DIGEST_LEN : datum_len;
+#ifdef HAVE_LINUX_XATTRS
+		size_t extra_len = 0;
+#else
+		size_t extra_len = am_root ? RPRE_LEN : 0;
+		if (dget_len + extra_len < dget_len)
+			out_of_memory("receive_xattr"); /* overflow */
+#endif
+		if (dget_len + extra_len + name_len < dget_len)
+			out_of_memory("receive_xattr"); /* overflow */
+		ptr = new_array(char, dget_len + extra_len + name_len);
+		if (!ptr)
+			out_of_memory("receive_xattr");
+		name = ptr + dget_len + extra_len;
+		read_buf(f, name, name_len);
+		if (dget_len == datum_len)
+			read_buf(f, ptr, dget_len);
+		else {
+			*ptr = XSTATE_ABBREV;
+			read_buf(f, ptr + 1, MAX_DIGEST_LEN);
+		}
+#ifdef HAVE_LINUX_XATTRS
+		/* Non-root can only save the user namespace. */
+		if (!am_root && !HAS_PREFIX(name, USER_PREFIX)) {
+			free(ptr);
+			continue;
+		}
+#else
+		/* This OS only has a user namespace, so we either
+		 * strip the user prefix, or we put a non-user
+		 * namespace inside our rsync hierarchy. */
+		if (HAS_PREFIX(name, USER_PREFIX)) {
+			name += UPRE_LEN;
+			name_len -= UPRE_LEN;
+		} else if (am_root) {
+			name -= RPRE_LEN;
+			name_len += RPRE_LEN;
+			memcpy(name, RSYNC_PREFIX, RPRE_LEN);
+		} else {
+			free(ptr);
+			continue;
+		}
+#endif
+		rxa = EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, 1);
+		rxa->name = name;
+		rxa->datum = ptr;
+		rxa->name_len = name_len;
+		rxa->datum_len = datum_len;
+	}
+
+	ndx = rsync_xal_l.count; /* pre-incremented count */
+	rsync_xal_store(&temp_xattr); /* adds item to rsync_xal_l */
+
+	F_XATTR(file) = ndx;
+}
+
+/* Turn the xattr data in statx into cached xattr data, setting the index
+ * values in the file struct. */
+void cache_xattr(struct file_struct *file, statx *sxp)
+{
+	int ndx;
+
+	if (!sxp->xattr)
+		return;
+
+	ndx = find_matching_xattr(sxp->xattr);
+	if (ndx < 0)
+		rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
+
+	F_XATTR(file) = ndx;
+}
+
+static int rsync_xal_set(const char *fname, item_list *xalp, const char *fnamecmp)
+{
+	rsync_xa *rxas = xalp->items;
+	ssize_t list_len;
+	size_t i, len;
+	char *name, *ptr, sum[MAX_DIGEST_LEN];
+	int name_len, ret = 0;
+
+	/* This puts the current name list into the "namebuf" buffer. */
+	if ((list_len = get_xattr_names(fname)) < 0)
+		return -1;
+
+	for (i = 0; i < xalp->count; i++) {
+		name = rxas[i].name;
+
+		if (XATTR_ABBREV(rxas[i])) {
+			/* See if the fnamecmp version is identical. */
+			len = name_len = rxas[i].name_len;
+			if ((ptr = get_xattr_data(fnamecmp, name, &len, 1)) == NULL) {
+			  still_abbrev:
+				if (am_generator)
+					continue;
+				rprintf(FERROR, "Missing abbreviated xattr value, %s, for %s\n",
+					rxas[i].name, full_fname(fname));
+				ret = -1;
+				continue;
+			}
+			if (len != rxas[i].datum_len) {
+				free(ptr);
+				goto still_abbrev;
+			}
+
+			sum_init(checksum_seed);
+			sum_update(ptr, len);
+			sum_end(sum);
+			if (memcmp(sum, rxas[i].datum + 1, MAX_DIGEST_LEN) != 0) {
+				free(ptr);
+				goto still_abbrev;
+			}
+
+			if (fname != fnamecmp /* value is already set */
+			 && sys_lsetxattr(fname, name, ptr, len) < 0) {
+				rsyserr(FERROR, errno,
+					"rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed",
+					fname, name);
+				ret = -1;
+			}
+
+			if (am_generator) { /* generator items stay abbreviated */
+				if (rxas[i].datum[0] == XSTATE_ABBREV)
+					rxas[i].datum[0] = XSTATE_LOCAL;
+				free(ptr);
+				continue;
+			}
+
+			memcpy(ptr + len, name, name_len);
+			free(rxas[i].datum);
+
+			rxas[i].name = name = ptr + len;
+			rxas[i].datum = ptr;
+			continue;
+		}
+
+		if (sys_lsetxattr(fname, name, rxas[i].datum, rxas[i].datum_len) < 0) {
+			rsyserr(FERROR, errno,
+				"rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed",
+				fname, name);
+			ret = -1;
+		}
+	}
+
+	/* Remove any extraneous names. */
+	for (name = namebuf; list_len > 0; name += name_len) {
+		name_len = strlen(name) + 1;
+		list_len -= name_len;
+
+#ifdef HAVE_LINUX_XATTRS
+		/* We always ignore the system namespace, and non-root
+		 * ignores everything but the user namespace. */
+		if (am_root ? HAS_PREFIX(name, SYSTEM_PREFIX)
+			    : !HAS_PREFIX(name, USER_PREFIX))
+			continue;
+#endif
+
+		for (i = 0; i < xalp->count; i++) {
+			if (strcmp(name, rxas[i].name) == 0)
+				break;
+		}
+		if (i == xalp->count) {
+			if (sys_lremovexattr(fname, name) < 0) {
+				rsyserr(FERROR, errno,
+					"rsync_xal_clear: lremovexattr(\"%s\",\"%s\") failed",
+					fname, name);
+				ret = -1;
+			}
+		}
+	}
+
+	return ret;
+}
+
+/* Set extended attributes on indicated filename. */
+int set_xattr(const char *fname, const struct file_struct *file, const char *fnamecmp)
+{
+	int ndx;
+	item_list *lst = rsync_xal_l.items;
+
+	if (dry_run)
+		return 1; /* FIXME: --dry-run needs to compute this value */
+
+	if (read_only || list_only) {
+		errno = EROFS;
+		return -1;
+	}
+
+	ndx = F_XATTR(file);
+	return rsync_xal_set(fname, lst + ndx, fnamecmp);
+}
+
+#endif /* SUPPORT_XATTRS */