X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/3d19b4c83edab707de2ddf91b1469befc12de54e..982e05bbd578c15664a94751ee71e263481143da:/backup.c

diff --git a/backup.c b/backup.c
index 54d5fae8..391e3556 100644
--- a/backup.c
+++ b/backup.c
@@ -1,16 +1,16 @@
-/* 
+/*
    Copyright (C) Andrew Tridgell 1999
-   
+
    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., 675 Mass Ave, Cambridge, MA 02139, USA.
@@ -21,26 +21,232 @@
 #include "rsync.h"
 
 extern int verbose;
+extern int backup_suffix_len;
+extern int backup_dir_len;
+extern unsigned int backup_dir_remainder;
+extern char backup_dir_buf[MAXPATHLEN];
 extern char *backup_suffix;
+extern char *backup_dir;
 
+extern int am_root;
+extern int preserve_devices;
+extern int preserve_links;
+extern int preserve_hard_links;
+extern int orig_umask;
+extern int safe_symlinks;
 
-int make_backup(char *fname)
+/* simple backup creates a backup with a suffix in the same directory */
+static int make_simple_backup(char *fname)
 {
 	char fnamebak[MAXPATHLEN];
-	if (strlen(fname) + strlen(backup_suffix) > (MAXPATHLEN-1)) {
-		rprintf(FERROR,"backup filename too long\n");
+
+	if (stringjoin(fnamebak, sizeof fnamebak, fname, backup_suffix, NULL)
+	    >= sizeof fnamebak) {
+		rprintf(FERROR, "backup filename too long\n");
 		return 0;
 	}
 
-	slprintf(fnamebak,sizeof(fnamebak),"%s%s",fname,backup_suffix);
-	if (do_rename(fname,fnamebak) != 0) {
+	if (do_rename(fname, fnamebak) != 0) {
 		/* cygwin (at least version b19) reports EINVAL */
 		if (errno != ENOENT && errno != EINVAL) {
-			rprintf(FERROR,"rename %s %s : %s\n",fname,fnamebak,strerror(errno));
+			rsyserr(FERROR, errno, "rename %s to backup %s", fname, fnamebak);
 			return 0;
 		}
 	} else if (verbose > 1) {
-		rprintf(FINFO,"backed up %s to %s\n",fname,fnamebak);
+		rprintf(FINFO, "backed up %s to %s\n", fname, fnamebak);
 	}
 	return 1;
 }
+
+
+/****************************************************************************
+Create a directory given an absolute path, perms based upon another directory
+path
+****************************************************************************/
+static int make_bak_dir(char *fullpath)
+{
+	STRUCT_STAT st;
+	char *rel = fullpath + backup_dir_len;
+	char *end = rel + strlen(rel);
+	char *p = end;
+
+	while (strncmp(fullpath, "./", 2) == 0)
+		fullpath += 2;
+
+	/* Try to find an existing dir, starting from the deepest dir. */
+	while (1) {
+		if (--p == fullpath) {
+			p += strlen(p);
+			goto failure;
+		}
+		if (*p == '/') {
+			*p = '\0';
+			if (do_mkdir(fullpath, 0777 & ~orig_umask) == 0)
+				break;
+			if (errno != ENOENT) {
+				rprintf(FERROR,
+				    "make_bak_dir mkdir %s failed: %s\n",
+				    full_fname(fullpath), strerror(errno));
+				goto failure;
+			}
+		}
+	}
+
+	/* Make all the dirs that we didn't find on the way here. */
+	while (1) {
+		if (p >= rel) {
+			/* Try to transfer the directory settings of the
+			 * actual dir that the files are coming from. */
+			if (do_lstat(rel, &st) != 0) {
+				rprintf(FERROR,
+				    "make_bak_dir stat %s failed: %s\n",
+				    full_fname(rel), strerror(errno));
+			} else {
+				do_lchown(fullpath, st.st_uid, st.st_gid);
+				do_chmod(fullpath, st.st_mode);
+			}
+		}
+		*p = '/';
+		p += strlen(p);
+		if (p == end)
+			break;
+		if (do_mkdir(fullpath, 0777 & ~orig_umask) < 0) {
+			rprintf(FERROR,
+			    "make_bak_dir mkdir %s failed: %s\n",
+			    full_fname(fullpath), strerror(errno));
+			goto failure;
+		}
+	}
+	return 0;
+
+failure:
+	while (p != end) {
+		*p = '/';
+		p += strlen(p);
+	}
+	return -1;
+}
+
+/* robustly move a file, creating new directory structures if necessary */
+static int robust_move(char *src, char *dst)
+{
+	if (robust_rename(src, dst, 0755) < 0 && (errno != ENOENT
+	    || make_bak_dir(dst) < 0 || robust_rename(src, dst, 0755) < 0))
+		return -1;
+	return 0;
+}
+
+
+/* If we have a --backup-dir, then we get here from make_backup().
+ * We will move the file to be deleted into a parallel directory tree. */
+static int keep_backup(char *fname)
+{
+	STRUCT_STAT st;
+	struct file_struct *file;
+	int kept = 0;
+	int ret_code;
+
+	/* return if no file to keep */
+#if SUPPORT_LINKS
+	if (do_lstat(fname, &st)) return 1;
+#else
+	if (do_stat(fname, &st)) return 1;
+#endif
+
+	file = make_file(fname, NULL, NO_EXCLUDES);
+
+	/* the file could have disappeared */
+	if (!file) return 1;
+
+	/* make a complete pathname for backup file */
+	if (stringjoin(backup_dir_buf + backup_dir_len, backup_dir_remainder,
+	    fname, backup_suffix, NULL) >= backup_dir_remainder) {
+		rprintf(FERROR, "keep_backup filename too long\n");
+		return 0;
+	}
+
+#ifdef HAVE_MKNOD
+	/* Check to see if this is a device file, or link */
+	if (IS_DEVICE(file->mode)) {
+		if (am_root && preserve_devices) {
+			if (do_mknod(backup_dir_buf, file->mode, file->u.rdev) < 0
+			    && (errno != ENOENT || make_bak_dir(backup_dir_buf) < 0
+			     || do_mknod(backup_dir_buf, file->mode, file->u.rdev) < 0)) {
+				rprintf(FERROR, "mknod %s failed: %s\n",
+					full_fname(backup_dir_buf), strerror(errno));
+			} else if (verbose > 2) {
+				rprintf(FINFO,
+					"make_backup: DEVICE %s successful.\n",
+					fname);
+			}
+		}
+		kept = 1;
+		do_unlink(fname);
+	}
+#endif
+
+	if (!kept && S_ISDIR(file->mode)) {
+		/* make an empty directory */
+		if (do_mkdir(backup_dir_buf, file->mode) < 0
+		    && (errno != ENOENT || make_bak_dir(backup_dir_buf) < 0
+		     || do_mkdir(backup_dir_buf, file->mode) < 0)) {
+			rprintf(FINFO, "mkdir %s failed: %s\n",
+				full_fname(backup_dir_buf), strerror(errno));
+		}
+
+		ret_code = do_rmdir(fname);
+		if (verbose > 2) {
+			rprintf(FINFO, "make_backup: RMDIR %s returns %i\n",
+				full_fname(fname), ret_code);
+		}
+		kept = 1;
+	}
+
+#if SUPPORT_LINKS
+	if (!kept && preserve_links && S_ISLNK(file->mode)) {
+		if (safe_symlinks && unsafe_symlink(file->u.link, backup_dir_buf)) {
+			if (verbose) {
+				rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n",
+					full_fname(backup_dir_buf), file->u.link);
+			}
+			kept = 1;
+		}
+		if (do_symlink(file->u.link, backup_dir_buf) < 0
+		    && (errno != ENOENT || make_bak_dir(backup_dir_buf) < 0
+		     || do_symlink(file->u.link, backup_dir_buf) < 0)) {
+			rprintf(FERROR, "link %s -> %s : %s\n",
+				full_fname(backup_dir_buf), file->u.link, strerror(errno));
+		}
+		do_unlink(fname);
+		kept = 1;
+	}
+#endif
+
+	if (!kept && !S_ISREG(file->mode)) {
+		rprintf(FINFO, "make_bak: skipping non-regular file %s\n",
+			fname);
+	}
+
+	/* move to keep tree if a file */
+	if (!kept) {
+		if (robust_move(fname, backup_dir_buf) != 0) {
+			rprintf(FERROR, "keep_backup failed: %s -> \"%s\": %s\n",
+				full_fname(fname), backup_dir_buf, strerror(errno));
+		}
+	}
+	set_perms(backup_dir_buf, file, NULL, 0);
+	free(file);
+
+	if (verbose > 1)
+		rprintf(FINFO, "keep_backup %s -> %s\n", fname, backup_dir_buf);
+	return 1;
+}
+
+
+/* main backup switch routine */
+int make_backup(char *fname)
+{
+	if (backup_dir)
+		return keep_backup(fname);
+	return make_simple_backup(fname);
+}