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lib/repo: Handle EACCES for POSIX locking 

If `glnx_make_lock_file` falls back to `flock`, on NFS this uses POSIX
locks (`F_SETLK`). As such, we need to be able to handle `EACCES` as
well as `EAGAIN` (see `fnctl(2)`).

I think this is what coreos-ostree-importer has been hitting, which runs
on RHEL7 in the Fedora infra and does locking over an NFS share where
multiple apps could concurrently pull things into the repo.
This commit is contained in:
Jonathan Lebon 2020-06-30 15:05:19 -04:00
parent fd8ecdf047
commit 1d755f62af
2 changed files with 4 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/libostree/ostree-repo-commit.c
View File

@ -1933,7 +1933,7 @@ rename_pending_loose_objects (OstreeRepo *self,
return TRUE;
}
/* Try to lock a transaction stage directory created by
/* Try to lock and delete a transaction stage directory created by
* ostree_repo_prepare_transaction().
*/
static gboolean

4
src/libostree/ostree-repo.c
View File

@ -5980,7 +5980,9 @@ _ostree_repo_try_lock_tmpdir (int tmpdir_dfd,
if (!glnx_make_lock_file (tmpdir_dfd, lock_name, LOCK_EX | LOCK_NB,
file_lock_out, &local_error))
{
if (g_error_matches (local_error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK))
/* we need to handle EACCES too in the case of POSIX locks; see F_SETLK in fcntl(2) */
if (g_error_matches (local_error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK)
|| g_error_matches (local_error, G_IO_ERROR, G_IO_ERROR_PERMISSION_DENIED))
{
did_lock = FALSE;
}