X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/774d1c367bbde80c2d9ce8875048860c8c0b5272..a8e6e1486960fe2e9ac190ad53e9830f0f3f900a:/xattrs.c

diff --git a/xattrs.c b/xattrs.c
index 552a63b3..0eceb393 100644
--- a/xattrs.c
+++ b/xattrs.c
@@ -3,7 +3,7 @@
  * Written by Jay Fenlason, vaguely based on the ACLs patch.
  *
  * Copyright (C) 2004 Red Hat, Inc.
- * Copyright (C) 2006-2008 Wayne Davison
+ * Copyright (C) 2006-2009 Wayne Davison
  *
  * 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
@@ -21,6 +21,7 @@
 
 #include "rsync.h"
 #include "ifuncs.h"
+#include "inums.h"
 #include "lib/sysxattrs.h"
 
 #ifdef SUPPORT_XATTRS
@@ -44,9 +45,9 @@ extern int checksum_seed;
 
 #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_ABBREV	1
+#define XSTATE_DONE	2
+#define XSTATE_TODO	3
 
 #define USER_PREFIX "user."
 #define UPRE_LEN ((int)sizeof USER_PREFIX - 1)
@@ -81,6 +82,8 @@ static char *namebuf = NULL;
 static item_list empty_xattr = EMPTY_ITEM_LIST;
 static item_list rsync_xal_l = EMPTY_ITEM_LIST;
 
+static size_t prior_xattr_count = (size_t)-1;
+
 /* ------------------------------------------------------------------------- */
 
 static void rsync_xal_free(item_list *xalp)
@@ -114,7 +117,7 @@ static int rsync_xal_compare_names(const void *x1, const void *x2)
 static ssize_t get_xattr_names(const char *fname)
 {
 	ssize_t list_len;
-	double arg;
+	int64 arg;
 
 	if (!namebuf) {
 		namebuf_len = 1024;
@@ -132,11 +135,11 @@ static ssize_t get_xattr_names(const char *fname)
 		} else if (errno == ENOTSUP)
 			return 0;
 		else if (errno != ERANGE) {
-			arg = (double)namebuf_len;
+			arg = namebuf_len;
 		  got_error:
 			rsyserr(FERROR_XFER, errno,
-				"get_xattr_names: llistxattr(\"%s\",%.0f) failed",
-				fname, arg);
+				"get_xattr_names: llistxattr(\"%s\",%s) failed",
+				fname, big_num(arg));
 			return -1;
 		}
 		list_len = sys_llistxattr(fname, NULL, 0);
@@ -288,6 +291,48 @@ int get_xattr(const char *fname, stat_x *sxp)
 	return 0;
 }
 
+int copy_xattrs(const char *source, const char *dest)
+{
+	ssize_t list_len, name_len;
+	size_t datum_len;
+	char *name, *ptr;
+#ifdef HAVE_LINUX_XATTRS
+	int user_only = am_sender ? 0 : am_root <= 0;
+#endif
+
+	/* This puts the name list into the "namebuf" buffer. */
+	if ((list_len = get_xattr_names(source)) < 0)
+		return -1;
+
+	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 (user_only ? !HAS_PREFIX(name, USER_PREFIX)
+			      : HAS_PREFIX(name, SYSTEM_PREFIX))
+			continue;
+#endif
+
+		datum_len = 0;
+		if (!(ptr = get_xattr_data(source, name, &datum_len, 0)))
+			return -1;
+		if (sys_lsetxattr(dest, name, ptr, datum_len) < 0) {
+			int save_errno = errno ? errno : EINVAL;
+			rsyserr(FERROR_XFER, errno,
+				"rsync_xal_set: lsetxattr(\"%s\",\"%s\") failed",
+				dest, name);
+			errno = save_errno;
+			return -1;
+		}
+		free(ptr);
+	}
+
+	return 0;
+}
+
 static int find_matching_xattr(item_list *xalp)
 {
 	size_t i, j;
@@ -461,9 +506,11 @@ int xattr_diff(struct file_struct *file, stat_x *sxp, int find_all)
 	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. */
+/* When called by the generator (with a NULL fname), this tells the sender
+ * all the abbreviated xattr values we need.  When called by the sender
+ * (with a non-NULL fname), we send all the extra xattr data it needs.
+ * The generator may also call with f_out < 0 to just change all the
+ * XSTATE_ABBREV states into XSTATE_DONE. */
 void send_xattr_request(const char *fname, struct file_struct *file, int f_out)
 {
 	item_list *lst = rsync_xal_l.items;
@@ -482,6 +529,7 @@ void send_xattr_request(const char *fname, struct file_struct *file, int f_out)
 				rxa->datum[0] = XSTATE_DONE;
 			continue;
 		case XSTATE_TODO:
+			assert(f_out >= 0);
 			break;
 		default:
 			continue;
@@ -510,7 +558,8 @@ void send_xattr_request(const char *fname, struct file_struct *file, int f_out)
 		}
 	}
 
-	write_byte(f_out, 0); /* end the list */
+	if (f_out >= 0)
+		write_byte(f_out, 0); /* end the list */
 }
 
 /* When called by the sender, read the request from the generator and mark
@@ -544,8 +593,9 @@ int recv_xattr_request(struct file_struct *file, int f_in)
 				who_am_i(), num, f_name(file, NULL));
 			exit_cleanup(RERR_STREAMIO);
 		}
-		if (rxa->datum_len <= MAX_FULL_DATUM || rxa->datum[0] != XSTATE_ABBREV) {
-			rprintf(FERROR, "[%s] internal abbrev error!\n", who_am_i());
+		if (!XATTR_ABBREV(*rxa) || rxa->datum[0] != XSTATE_ABBREV) {
+			rprintf(FERROR, "[%s] internal abbrev error on %s (%s, len=%ld)!\n",
+				who_am_i(), f_name(file, NULL), rxa->name, (long)rxa->datum_len);
 			exit_cleanup(RERR_STREAMIO);
 		}
 
@@ -677,13 +727,15 @@ void receive_xattr(struct file_struct *file, int f)
 
 /* Turn the xattr data in stat_x into cached xattr data, setting the index
  * values in the file struct. */
-void cache_xattr(struct file_struct *file, stat_x *sxp)
+void cache_tmp_xattr(struct file_struct *file, stat_x *sxp)
 {
 	int ndx;
 
 	if (!sxp->xattr)
 		return;
 
+	if (prior_xattr_count == (size_t)-1)
+		prior_xattr_count = rsync_xal_l.count;
 	ndx = find_matching_xattr(sxp->xattr);
 	if (ndx < 0)
 		rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
@@ -691,6 +743,21 @@ void cache_xattr(struct file_struct *file, stat_x *sxp)
 	F_XATTR(file) = ndx;
 }
 
+void uncache_tmp_xattrs(void)
+{
+	if (prior_xattr_count != (size_t)-1) {
+		item_list *xattr_item = rsync_xal_l.items;
+		item_list *xattr_start = xattr_item + prior_xattr_count;
+		xattr_item += rsync_xal_l.count;
+		rsync_xal_l.count = prior_xattr_count;
+		while (xattr_item-- > xattr_start) {
+			rsync_xal_free(xattr_item);
+			free(xattr_item);
+		}
+		prior_xattr_count = (size_t)-1;
+	}
+}
+
 static int rsync_xal_set(const char *fname, item_list *xalp,
 			 const char *fnamecmp, stat_x *sxp)
 {
@@ -698,6 +765,9 @@ static int rsync_xal_set(const char *fname, item_list *xalp,
 	ssize_t list_len;
 	size_t i, len;
 	char *name, *ptr, sum[MAX_DIGEST_LEN];
+#ifdef HAVE_LINUX_XATTRS
+	int user_only = am_root <= 0;
+#endif
 	size_t name_len;
 	int ret = 0;
 
@@ -773,8 +843,8 @@ static int rsync_xal_set(const char *fname, item_list *xalp,
 #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))
+		if (user_only ? !HAS_PREFIX(name, USER_PREFIX)
+			      : HAS_PREFIX(name, SYSTEM_PREFIX))
 			continue;
 #endif
 		if (am_root < 0 && name_len > RPRE_LEN
@@ -920,7 +990,7 @@ int set_stat_xattr(const char *fname, struct file_struct *file, mode_t new_mode)
 	fst.st_mode &= (_S_IFMT | CHMOD_BITS);
 	fmode = new_mode & (_S_IFMT | CHMOD_BITS);
 
-	if (IS_DEVICE(fmode) || IS_SPECIAL(fmode)) {
+	if (IS_DEVICE(fmode)) {
 		uint32 *devp = F_RDEV_P(file);
 		rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
 	} else
@@ -931,7 +1001,7 @@ int set_stat_xattr(const char *fname, struct file_struct *file, mode_t new_mode)
 	     | (S_ISDIR(fst.st_mode) ? 0700 : 0600);
 	if (fst.st_mode != mode)
 		do_chmod(fname, mode);
-	if (!IS_DEVICE(fst.st_mode) && !IS_SPECIAL(fst.st_mode))
+	if (!IS_DEVICE(fst.st_mode))
 		fst.st_rdev = 0; /* just in case */
 
 	if (mode == fmode && fst.st_rdev == rdev