patch from James Delahanty <jimd@gie.com> to make --backup-dir work

cross-filesystem

1 files changed, 123 insertions, 18 deletions

diff --git a/backup.c b/backup.c
index 24f8523a..ee323f3f 100644
--- a/backup.c
+++ b/backup.c
@@ -25,6 +25,11 @@ 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)
 {
@@ -71,6 +76,56 @@ static int make_dir(char *name, int mask)
 } /* 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]!='/') {
+                slprintf(fullpath,sizeof(fullpath),"%s/",bak_path);
+        } else {
+                slprintf(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,'/'))) {
+                *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 : %s\n",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 : %s\n",fullpath,strerror(errno));
+                                        };
+                                        if(do_chmod(fullpath,st2->st_mode)!=0) {
+                                                rprintf(FERROR,"make_bak_dir failed to set permissions on %s : %s\n",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)
 {
@@ -113,12 +168,16 @@ 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;
@@ -136,32 +195,78 @@ static int keep_backup(char *fname)
 
 	file = make_file (0, fname);
 
-	/* make a complete pathname for backup file */
-	if (strlen(backup_dir) + strlen(fname) > (MAXPATHLEN - 1)) {
-		rprintf (FERROR, "keep_backup filename too long\n");
-		return 0;
-	}
-	slprintf(keep_name, sizeof (keep_name), "%s/%s", backup_dir, fname);
+        /* make a complete pathname for backup file */
+        if (strlen(backup_dir) + strlen(fname) > (MAXPATHLEN - 1)) {
+                rprintf (FERROR, "keep_backup filename too long\n");
+                return 0;
+        }
+
+        slprintf(keep_name, sizeof (keep_name), "%s/%s", backup_dir, fname);
+
+
+#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->rdev)!=0) {
+                                rprintf(FERROR,"mknod %s : %s\n",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",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->link, keep_name)) {
+                        if (verbose) {
+                                rprintf(FINFO,"ignoring unsafe symlink %s -> %s\n",
+                                        keep_name,file->link);
+                        }
+			kept=1;
+                }
+                make_bak_dir(fname,backup_dir);
+                if(do_symlink(file->link,keep_name) != 0) {
+                        rprintf(FERROR,"link %s -> %s : %s\n",keep_name,file->link,strerror(errno));
+                };
+                do_unlink(fname);
+		kept=1;
+        };
+#endif
+        if(!kept && preserve_hard_links && check_hard_link(file)) {
+                if(verbose > 1) 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);
+        }
 
-	if (!S_ISDIR(file->mode)) {
 	/* move to keep tree if a file */
+	if(!kept) {
 		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);
-		if (verbose > 1)
-			rprintf (FINFO, "keep_backup: made empty dir: %s\n",
-				keep_name);
-	}
-
+	};
 	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);
 	return 1;