[PATCH v4 15/15] fetch-pack: restore save_commit_buffer after use
- From
- Jeff Hostetler <git@jeffhostetler.com>
- Date
- Nov 16, 2017, 18:17 UTC
- Message-ID
- <20171116181723.62033-16-git@jeffhostetler.com>
- In-Reply-To
- <20171116181723.62033-1-git@jeffhostetler.com>
From: Jonathan Tan <jonathantanmy@google.com>
In fetch-pack, the global variable save_commit_buffer is set to 0, but not restored to its original value after use.
In particular, if show_log() (in log-tree.c) is invoked after fetch_pack() in the same process, show_log() will return before printing out the commit message (because the invocation to get_cached_commit_buffer() returns NULL, because the commit buffer was not saved). I discovered this when attempting to run "git log -S" in a partial clone, triggering the case where revision walking lazily loads missing objects.
Therefore, restore save_commit_buffer to its original value after use.
An alternative to solve the problem I had is to replace get_cached_commit_buffer() with get_commit_buffer(). That invocation was introduced in commit a97934d ("use get_cached_commit_buffer where appropriate", 2014-06-13) to replace "commit->buffer" introduced in commit 3131b71 ("Add "--show-all" revision walker flag for debugging", 2008-02-13). In the latter commit, the commit author seems to be deciding between not showing an unparsed commit at all and showing an unparsed commit without the message (which is what the commit does), and did not mention parsing the unparsed commit, so I prefer to preserve the existing behavior.
Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com> --- fetch-pack.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/fetch-pack.c b/fetch-pack.c index 895e8f9..121f03e 100644 --- a/fetch-pack.c +++ b/fetch-pack.c @@ -717,6 +717,7 @@ static int everything_local(struct fetch_pack_args *args, { struct ref *ref; int retval; + int old_save_commit_buffer = save_commit_buffer; timestamp_t cutoff = 0; save_commit_buffer = 0; @@ -784,6 +785,9 @@ static int everything_local(struct fetch_pack_args *args, print_verbose(args, _("already have %s (%s)"), oid_to_hex(remote), ref->name); } + + save_commit_buffer = old_save_commit_buffer; + return retval; }
-- 2.9.3