[PATCH v2] xfsrestore: suggest -x rather than assert for false roots

Donald Douwsma
2023-08-07T04:56:21Z

If we're going to have a fix for false root problems its a good idea to
let people know that there's a way to recover, error out with a useful
message that mentions the `-x` option rather than just assert.

Before

xfsrestore: searching media for directory dump
xfsrestore: reading directories
xfsrestore: tree.c:757: tree_begindir: Assertion `ino != persp->p_rootino || hardh == persp->p_rooth' failed.
Aborted

After

xfsrestore: ERROR: tree.c:791: tree_begindir: Assertion `ino != persp->p_rootino || hardh == persp->p_rooth` failed.
xfsrestore: ERROR: False root detected. Recovery may be possible using the `-x` option
Aborted

Fixes: d7cba7410710 ("xfsrestore: fix rootdir due to xfsdump bulkstat misuse")
Signed-off-by: Donald Douwsma <ddouwsma@redhat.com>

---
Changes for v2
- Use xfsprogs style for conditional
- Remove trailing white-space
- Place printf format all on one line for grepability
- use __func__ instead of gcc specific __FUNCTION__
---
restore/tree.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/restore/tree.c b/restore/tree.c
index bfa07fe..e959aa1 100644
--- a/restore/tree.c
+++ b/restore/tree.c
@@ -783,8 +783,15 @@ tree_begindir(filehdr_t *fhdrp, dah_t *dahp)
/* lookup head of hardlink list
*/
hardh = link_hardh(ino, gen);
- if (need_fixrootdir == BOOL_FALSE)
- assert(ino != persp->p_rootino || hardh == persp->p_rooth);
+ if (need_fixrootdir == BOOL_FALSE &&
+ !(ino != persp->p_rootino || hardh == persp->p_rooth)) {
+ mlog(MLOG_ERROR | MLOG_TREE,
+"%s:%d: %s: Assertion `ino != persp->p_rootino || hardh == persp->p_rooth` failed.\n",
+ __FILE__, __LINE__, __func__);
+ mlog(MLOG_ERROR | MLOG_TREE, _(
+"False root detected. Recovery may be possible using the `-x` option\n"));
+ return NH_NULL;
+ }

/* already present
*/
--
2.39.3