X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/66203a982b3d249bafda9b9272c4c103c19e4a9b..d17e1dd2dae6bfd9e2e147a0dd3039848dd43abc:/backup.c

diff --git a/backup.c b/backup.c
index 24f8523a..dd1b3dd0 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.
@@ -21,28 +21,34 @@
 #include "rsync.h"
 
 extern int verbose;
+extern int backup_suffix_len;
+extern int backup_dir_len;
 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;
 
 /* 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 (strlen(fname) + backup_suffix_len > MAXPATHLEN-1) {
+		rprintf(FERROR, "backup filename too long\n");
 		return 0;
 	}
 
-	slprintf(fnamebak,sizeof(fnamebak),"%s%s",fname,backup_suffix);
-	if (do_rename(fname,fnamebak) != 0) {
+	snprintf(fnamebak, sizeof(fnamebak), "%s%s", fname, backup_suffix);
+	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;
 }
@@ -63,14 +69,68 @@ static int make_dir(char *name, int mask)
 	*p = 0;
 
 	/* make the new directory, if that fails then make its parent */
-	while (do_mkdir (newdir, mask) != 0)
-		if ((errno != ENOENT) || !make_dir (newdir, mask))
+	while (do_mkdir(newdir, mask) != 0) {
+		if (errno != ENOENT || !make_dir(newdir, mask))
 			return 0;
+	}
 
 	return 1;
 } /* make_dir */
 
 
+/****************************************************************************
+Create a directory given an absolute path, perms based upon another directory
+path
+****************************************************************************/
+static int make_bak_dir(char *fname, char *bak_path)
+{
+	STRUCT_STAT st;
+	STRUCT_STAT *st2;
+	char fullpath[MAXPATHLEN];
+	extern int orig_umask;
+	char *p;
+	char *q;
+
+	while(strncmp(bak_path, "./", 2) == 0) bak_path += 2;
+
+	if (bak_path[strlen(bak_path)-1] != '/') {
+		snprintf(fullpath, sizeof(fullpath), "%s/", bak_path);
+	} else {
+		snprintf(fullpath, sizeof(fullpath), "%s", bak_path);
+	}
+	p = fullpath;
+	q = &fullpath[strlen(fullpath)];  /* End of bak_path string */
+	strcat(fullpath, fname);
+
+	/* Make the directories */
+	while ((p = strchr(p, '/')) != NULL) {
+		*p = 0;
+		if (do_lstat(fullpath, &st) != 0) {
+			do_mkdir(fullpath, 0777 & ~orig_umask);
+			if (p > q) {
+				if (do_lstat(q, &st) != 0) {
+					rprintf(FERROR, "make_bak_dir stat %s failed: %s\n",
+						full_fname(fullpath), strerror(errno));
+				} else {
+					st2 = &st;
+					set_modtime(fullpath, st2->st_mtime);
+					if (do_lchown(fullpath, st2->st_uid, st2->st_gid) != 0) {
+						rprintf(FERROR, "make_bak_dir chown %s failed: %s\n",
+							full_fname(fullpath), strerror(errno));
+					}
+					if (do_chmod(fullpath, st2->st_mode) != 0) {
+						rprintf(FERROR, "make_bak_dir failed to set permissions on %s: %s\n",
+							full_fname(fullpath), strerror(errno));
+					}
+				}
+			}
+		}
+		*p = '/';
+		p++;
+	}
+	return 0;
+}
+
 /* robustly move a file, creating new directory structures if necessary */
 static int robust_move(char *src, char *dst)
 {
@@ -79,33 +139,35 @@ static int robust_move(char *src, char *dst)
 	int failed;
 
 	while (keep_trying) {
-		if (keep_path_extfs)
-			failed = copy_file (src, dst, 0755);
-		else
-			failed = robust_rename (src, dst);
+		if (keep_path_extfs) {
+			failed = copy_file(src, dst, 0755);
+			if (!failed)
+				do_unlink(src);
+		} else
+			failed = robust_rename(src, dst);
 
 		if (failed) {
-			if (verbose > 2)
-				rprintf (FERROR, "robust_move failed: %s(%d)\n",
-					strerror (errno), errno);
+			if (verbose > 2) {
+				rprintf(FERROR, "robust_move failed: %s(%d)\n",
+					strerror(errno), errno);
+			}
 			switch (errno) {
-				/* external filesystem */
-				case EXDEV:
-					keep_path_extfs = 1;
-					keep_trying--;
-					break;
-				/* no directory to write to */
-				case ENOENT:
-					make_dir (dst, 0755);
-					keep_trying--;
-					break;
-				default:
-					keep_trying = 0;
-			} /* switch */
+			case EXDEV:	/* external filesystem */
+				keep_path_extfs = 1;
+				keep_trying--;
+				break;
+			case ENOENT:	/* no directory to write to */
+				make_dir(dst, 0700);
+				keep_trying--;
+				break;
+			default:
+				keep_trying = 0;
+				break;
+			}
 		} else
 			keep_trying = 0;
 	} /* while */
-	return (!failed);
+	return !failed;
 } /* robust_move */
 
 
@@ -113,57 +175,120 @@ static int robust_move(char *src, char *dst)
    We will move the file to be deleted into a parallel directory tree */
 static int keep_backup(char *fname)
 {
+
 	static int initialised;
 
 	char keep_name [MAXPATHLEN];
 	STRUCT_STAT st;
 	struct file_struct *file;
 
+	int kept = 0;
+	int ret_code;
+
 	if (!initialised) {
-		if (backup_dir[strlen(backup_dir) - 1] == '/')
-			backup_dir[strlen(backup_dir) - 1] = 0;
+		if (backup_dir_len && backup_dir[backup_dir_len - 1] == '/')
+			backup_dir[--backup_dir_len] = '\0';
 		if (verbose > 0)
-			rprintf (FINFO, "backup_dir is %s\n", backup_dir);
+			rprintf(FINFO, "backup_dir is %s\n", backup_dir);
 		initialised = 1;
 	}
 
 	/* return if no file to keep */
 #if SUPPORT_LINKS
-	if (do_lstat (fname, &st)) return 1;
+	if (do_lstat(fname, &st)) return 1;
 #else
-	if (do_stat (fname, &st)) return 1;
+	if (do_stat(fname, &st)) return 1;
 #endif
 
-	file = make_file (0, fname);
+	file = make_file(fname, NULL, NO_EXCLUDES);
+
+	/* the file could have disappeared */
+	if (!file) return 1;
 
 	/* make a complete pathname for backup file */
-	if (strlen(backup_dir) + strlen(fname) > (MAXPATHLEN - 1)) {
-		rprintf (FERROR, "keep_backup filename too long\n");
+	if (backup_dir_len+strlen(fname)+backup_suffix_len > MAXPATHLEN-1) {
+		rprintf(FERROR, "keep_backup filename too long\n");
 		return 0;
 	}
-	slprintf(keep_name, sizeof (keep_name), "%s/%s", backup_dir, fname);
 
-	if (!S_ISDIR(file->mode)) {
-	/* move to keep tree if a file */
-		if (!robust_move (fname, keep_name))
-			rprintf(FERROR, "keep_backup failed %s -> %s : %s\n",
-				fname, keep_name, strerror(errno));
-	} else {
-	/* this bit only used to "keep" empty directories */
-		/* make the parent directories */
-		make_dir (keep_name, 0755);
-		/* now make the (empty) directory */
-		do_mkdir (keep_name, file->mode);
+	snprintf(keep_name, sizeof (keep_name), "%s/%s%s",
+	    backup_dir, fname, backup_suffix);
+
+#ifdef HAVE_MKNOD
+	/* Check to see if this is a device file, or link */
+	if (IS_DEVICE(file->mode)) {
+		if (am_root && preserve_devices) {
+			make_bak_dir(fname, backup_dir);
+			if (do_mknod(keep_name, file->mode, file->u.rdev) != 0) {
+				rprintf(FERROR, "mknod %s failed: %s\n",
+					full_fname(keep_name), 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 */
+		make_bak_dir(fname, backup_dir);
+		do_mkdir(keep_name, file->mode);
+		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)) {
+		extern int safe_symlinks;
+		if (safe_symlinks && unsafe_symlink(file->u.link, keep_name)) {
+			if (verbose) {
+				rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n",
+					full_fname(keep_name), file->u.link);
+			}
+			kept = 1;
+		}
+		make_bak_dir(fname, backup_dir);
+		if (do_symlink(file->u.link, keep_name) != 0) {
+			rprintf(FERROR, "link %s -> %s : %s\n",
+				full_fname(keep_name), file->u.link, strerror(errno));
+		}
+		do_unlink(fname);
+		kept = 1;
+	}
+#endif
+	if (!kept && preserve_hard_links && file->link_u.links
+	    && file->F_HEAD != file) {
 		if (verbose > 1)
-			rprintf (FINFO, "keep_backup: made empty dir: %s\n",
-				keep_name);
+			rprintf(FINFO, "%s is a hard link\n", f_name(file));
+	}
+
+	if (!kept && !S_ISREG(file->mode)) {
+		rprintf(FINFO, "make_bak: skipping non-regular file %s\n",
+			fname);
 	}
 
-	set_perms (keep_name, file, NULL, 0);
-	free_file (file);
-	free (file);
+	/* move to keep tree if a file */
+	if (!kept) {
+		if (!robust_move(fname, keep_name)) {
+			rprintf(FERROR, "keep_backup failed: %s -> \"%s\": %s\n",
+				full_fname(fname), keep_name, strerror(errno));
+		}
+	}
+	set_perms(keep_name, file, NULL, 0);
+	free_file(file);
+	free(file);
+
 	if (verbose > 1)
-		rprintf (FINFO, "keep_backup %s -> %s\n", fname, keep_name);
+		rprintf(FINFO, "keep_backup %s -> %s\n", fname, keep_name);
 	return 1;
 } /* keep_backup */
 
@@ -172,8 +297,6 @@ static int keep_backup(char *fname)
 int make_backup(char *fname)
 {
 	if (backup_dir)
-		return (keep_backup(fname));
-	else
-		return (make_simple_backup(fname));
+		return keep_backup(fname);
+	return make_simple_backup(fname);
 }
-