X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/4875d6b64dd0ed8d451746cc0cc609cff36192bd..bec617b934dc2ef90b7acd1c7ef4b5db74821e91:/backup.c

diff --git a/backup.c b/backup.c
index 1db011ce..7d288858 100644
--- a/backup.c
+++ b/backup.c
@@ -55,23 +55,37 @@ char *get_backup_name(char *fname)
 /* simple backup creates a backup with a suffix in the same directory */
 static int make_simple_backup(char *fname)
 {
+	int rename_errno;
 	char *fnamebak = get_backup_name(fname);
 
 	if (!fnamebak)
 		return 0;
 
-	if (do_rename(fname, fnamebak) != 0) {
-		/* cygwin (at least version b19) reports EINVAL */
-		if (errno != ENOENT && errno != EINVAL) {
-			rsyserr(FERROR, errno,
-				"rename %s to backup %s",
-				safe_fname(fname), safe_fname(fnamebak));
-			return 0;
+	while (1) {
+		if (do_rename(fname, fnamebak) == 0) {
+			if (verbose > 1) {
+				rprintf(FINFO, "backed up %s to %s\n",
+					safe_fname(fname),
+					safe_fname(fnamebak));
+			}
+			break;
 		}
-	} else if (verbose > 1) {
-		rprintf(FINFO, "backed up %s to %s\n",
+		/* cygwin (at least version b19) reports EINVAL */
+		if (errno == ENOENT || errno == EINVAL)
+			break;
+
+		rename_errno = errno;
+		if (errno == EISDIR && do_rmdir(fnamebak) == 0)
+			continue;
+		if (errno == ENOTDIR && do_unlink(fnamebak) == 0)
+			continue;
+
+		rsyserr(FERROR, rename_errno, "rename %s to backup %s",
 			safe_fname(fname), safe_fname(fnamebak));
+		errno = rename_errno;
+		return 0;
 	}
+
 	return 1;
 }
 
@@ -174,18 +188,16 @@ static int keep_backup(char *fname)
 		return 0;
 
 	/* Check to see if this is a device file, or link */
-	if (IS_DEVICE(file->mode)) {
-		if (am_root && preserve_devices) {
-			if (do_mknod(buf, file->mode, file->u.rdev) < 0
-			    && (errno != ENOENT || make_bak_dir(buf) < 0
-			     || do_mknod(buf, file->mode, file->u.rdev) < 0)) {
-				rsyserr(FERROR, errno, "mknod %s failed",
-					full_fname(buf));
-			} else if (verbose > 2) {
-				rprintf(FINFO,
-					"make_backup: DEVICE %s successful.\n",
-					safe_fname(fname));
-			}
+	if (IS_DEVICE(file->mode) && am_root && preserve_devices) {
+		do_unlink(buf);
+		if (do_mknod(buf, file->mode, file->u.rdev) < 0
+		    && (errno != ENOENT || make_bak_dir(buf) < 0
+		     || do_mknod(buf, file->mode, file->u.rdev) < 0)) {
+			rsyserr(FERROR, errno, "mknod %s failed",
+				full_fname(buf));
+		} else if (verbose > 2) {
+			rprintf(FINFO, "make_backup: DEVICE %s successful.\n",
+				safe_fname(fname));
 		}
 		kept = 1;
 		do_unlink(fname);
@@ -208,7 +220,7 @@ static int keep_backup(char *fname)
 		kept = 1;
 	}
 
-#if SUPPORT_LINKS
+#ifdef SUPPORT_LINKS
 	if (!kept && preserve_links && S_ISLNK(file->mode)) {
 		if (safe_symlinks && unsafe_symlink(file->u.link, buf)) {
 			if (verbose) {
@@ -216,15 +228,18 @@ static int keep_backup(char *fname)
 					full_fname(buf), file->u.link);
 			}
 			kept = 1;
+		} else {
+			do_unlink(buf);
+			if (do_symlink(file->u.link, buf) < 0
+			    && (errno != ENOENT || make_bak_dir(buf) < 0
+			     || do_symlink(file->u.link, buf) < 0)) {
+				rsyserr(FERROR, errno, "link %s -> \"%s\"",
+					full_fname(buf),
+					safe_fname(file->u.link));
+			}
+			do_unlink(fname);
+			kept = 1;
 		}
-		if (do_symlink(file->u.link, buf) < 0
-		    && (errno != ENOENT || make_bak_dir(buf) < 0
-		     || do_symlink(file->u.link, buf) < 0)) {
-			rsyserr(FERROR, errno, "link %s -> \"%s\"",
-				full_fname(buf), safe_fname(file->u.link));
-		}
-		do_unlink(fname);
-		kept = 1;
 	}
 #endif