Re: [PATCH 1/2] submodule: Include check for objects when fetching

Junio C Hamano [off-list ref] writes:

Stefan Beller [off-list ref] writes:

quoted

Junio wrote:

quoted

To be complete, the rev-list command line should also run with
"--objects"; after all, a commit walker fetch may have downloaded
commit chain completely but haven't fetched necessary trees and
blobs when it was killed, and "rev-list $sha1 --not --all" would not
catch such a breakage without "--objects".

By adding the --objects switch to rev-list we make sure to do a complete
check.

You also need to drop "-n1" for the command to be equivalent to
quickfetch, I think.

Ahh, I think I need to take it back.

As the existing code relies not just on the exit status of rev-list
but also checks if anything comes out of it, having "-n1" would not
hurt.

The case I was worried about was that we have all commits to connect
$sha1 to what are reachable from refs, but some tree/blob objects
referenced by these commits were missing.  By cutting the displaying
with "-n1", rev-list may happily exit successfully after showing $sha1,
without even realizing that some trees/blobs are missing and the history
leading to $sha1 cannot be considered complete.

But because the code checks the empty-ness of $rev, this case is diagnosed
as "$sha1 is not reachable from any of the refs" correctly anyway,
so it should be OK.

quoted

Signed-off-by: Stefan Beller <redacted>
---
 git-submodule.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/git-submodule.sh b/git-submodule.sh
index 9bc5c5f..f5d6675 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh

@@ -746,7 +746,7 @@ Maybe you want to use 'update --init'?")"
 				# Run fetch only if $sha1 isn't present or it
 				# is not reachable from a ref.
 				(clear_local_git_env; cd "$sm_path" &&
-					( (rev=$(git rev-list -n 1 $sha1 --not --all 2>/dev/null) &&
+					( (rev=$(git rev-list --objects -n 1 $sha1 --not --all 2>/dev/null) &&
 					 test -z "$rev") || git-fetch)) ||
 				die "$(eval_gettext "Unable to fetch in submodule path '\$displaypath'")"
 			fi