Adding the --fake-super option.

[rsync/rsync.git] / tls.c

diff --git a/tls.c b/tls.c
index cd4e26d..8a38819 100644 (file)
--- a/tls.c
+++ b/tls.c
@@ -34,15 +34,65 @@
  * change. */
 
 #include "rsync.h"
+#include "lib/sysxattrs.h"
 
 #define PROGRAM "tls"
 
 /* These are to make syscall.o shut up. */
 int dry_run = 0;
+int am_root = 0;
 int read_only = 1;
 int list_only = 0;
 int preserve_perms = 0;
 
+#ifdef HAVE_LINUX_XATTRS
+#define XSTAT_ATTR "user.rsync.%stat"
+#else
+#define XSTAT_ATTR "rsync.%stat"
+#endif
+
+static int stat_xattr(const char *fname, STRUCT_STAT *fst)
+{
+       int mode, rdev_major, rdev_minor, uid, gid, len;
+       char buf[256];
+
+       if (am_root >= 0 || IS_DEVICE(fst->st_mode) || IS_SPECIAL(fst->st_mode))
+               return -1;
+
+       len = sys_lgetxattr(fname, XSTAT_ATTR, buf, sizeof buf - 1);
+       if (len >= (int)sizeof buf) {
+               len = -1;
+               errno = ERANGE;
+       }
+       if (len < 0) {
+               if (errno == ENOTSUP || errno == ENOATTR)
+                       return -1;
+               if (errno == EPERM && S_ISLNK(fst->st_mode)) {
+                       fst->st_uid = 0;
+                       fst->st_gid = 0;
+                       return 0;
+               }
+               fprintf(stderr, "failed to read xattr %s for %s: %s\n",
+                       XSTAT_ATTR, fname, strerror(errno));
+               return -1;
+       }
+       buf[len] = '\0';
+
+       if (sscanf(buf, "%o %d,%d %d:%d",
+                  &mode, &rdev_major, &rdev_minor, &uid, &gid) != 5) {
+               fprintf(stderr, "Corrupt %s xattr attached to %s: \"%s\"\n",
+                       XSTAT_ATTR, fname, buf);
+               exit(1);
+       }
+
+       fst->st_mode = from_wire_mode(mode);
+       fst->st_rdev = MAKEDEV(rdev_major, rdev_minor);
+       fst->st_uid = uid;
+       fst->st_gid = gid;
+
+       return 0;
+}
+
 static void failed(char const *what, char const *where)
 {
        fprintf(stderr, PROGRAM ": %s %s: %s\n",
@@ -60,6 +110,8 @@ static void list_file(const char *fname)
 
        if (do_lstat(fname, &buf) < 0)
                failed("stat", fname);
+       if (am_root < 0)
+               stat_xattr(fname, &buf);
 
        /* The size of anything but a regular file is probably not
         * worth thinking about. */
@@ -125,9 +177,11 @@ main(int argc, char *argv[])
                return 1;
        }
 
-       for (argv++; *argv; argv++) {
+       if (getenv("RSYNC_FAKE_SUPER"))
+               am_root = -1;
+
+       for (argv++; *argv; argv++)
                list_file(*argv);
-       }
 
        return 0;
 }