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request-pull: warn if the remote object is not the same as the local one 

In some cases, git request-pull might be invoked with remote and
local objects that differ even though they point to the same commit.
For example, the remote object might be a lightweight tag
vs. an annotated tag on the local side; or the user might have
reworded the tag locally and forgotten to push it.

When this happens git-request-pull will not warn, because it only
checks that "git ls-remote" returns an SHA1 that matches the local
commit (known as $headrev in the script).  This patch makes
git-request-pull retrieve the tag object SHA1 while processing
the "git ls-remote" output, so that it can be matched against the
local object.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Paolo Bonzini 2019-05-28 12:15:43 +02:00 committed by Junio C Hamano
parent 5731dfce06
commit 0454220d66
2 changed files with 63 additions and 15 deletions
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43
git-request-pull.sh
View File

@ -65,6 +65,8 @@ test -z "$head" && die "fatal: Not a valid revision: $local"
headrev=$(git rev-parse --verify --quiet "$head"^0)
test -z "$headrev" && die "fatal: Ambiguous revision: $local"
local_sha1=$(git rev-parse --verify --quiet "$head")
# Was it a branch with a description?
branch_name=${head#refs/heads/}
if test "z$branch_name" = "z$headref" ||
@ -77,42 +79,53 @@ merge_base=$(git merge-base $baserev $headrev) ||
die "fatal: No commits in common between $base and $head"
# $head is the refname from the command line.
# If a ref with the same name as $head exists at the remote
# and their values match, use that.
#
# Otherwise find a random ref that matches $headrev.
# Find a ref with the same name as $head that exists at the remote
# and points to the same commit as the local object.
find_matching_ref='
my ($head,$headrev) = (@ARGV);
my $pattern = qr{/\Q$head\E$};
my ($found);
my ($remote_sha1, $found);
while (<STDIN>) {
chomp;
my ($sha1, $ref, $deref) = /^(\S+)\s+([^^]+)(\S*)$/;
next unless ($sha1 eq $headrev);
if ($ref eq $head) {
$found = $ref;
}
if ($ref =~ $pattern) {
$found = $ref;
}
if ($sha1 eq $head) {
$found = $sha1;
$found = $remote_sha1 = $sha1;
break;
}
if ($ref eq $head || $ref =~ $pattern) {
if ($deref eq "") {
# Remember the matching object on the remote side
$remote_sha1 = $sha1;
}
if ($sha1 eq $headrev) {
$found = $ref;
break;
}
}
}
if ($found) {
print "$found\n";
$remote_sha1 = $headrev if ! defined $remote_sha1;
print "$remote_sha1 $found\n";
}
'
ref=$(git ls-remote "$url" | @@PERL@@ -e "$find_matching_ref" "${remote:-HEAD}" "$headrev")
set fnord $(git ls-remote "$url" | @@PERL@@ -e "$find_matching_ref" "${remote:-HEAD}" "$headrev")
remote_sha1=$2
ref=$3
if test -z "$ref"
then
echo "warn: No match for commit $headrev found at $url" >&2
echo "warn: Are you sure you pushed '${remote:-HEAD}' there?" >&2
status=1
elif test "$local_sha1" != "$remote_sha1"
then
echo "warn: $head found at $url but points to a different object" >&2
echo "warn: Are you sure you pushed '${remote:-HEAD}' there?" >&2
status=1
fi
# Special case: turn "for_linus" to "tags/for_linus" when it is correct

35
t/t5150-request-pull.sh
View File

@ -264,4 +264,39 @@ test_expect_success 'request-pull quotes regex metacharacters properly' '
'
test_expect_success 'pull request with mismatched object' '
rm -fr downstream.git &&
git init --bare downstream.git &&
(
cd local &&
git checkout initial &&
git merge --ff-only master &&
git push origin HEAD:refs/tags/full &&
test_must_fail git request-pull initial "$downstream_url" tags/full \
2>../err
) &&
grep "points to a different object" err &&
grep "Are you sure you pushed" err
'
test_expect_success 'pull request with stale object' '
rm -fr downstream.git &&
git init --bare downstream.git &&
(
cd local &&
git checkout initial &&
git merge --ff-only master &&
git push origin refs/tags/full &&
git tag -f -m"Thirty-one days" full &&
test_must_fail git request-pull initial "$downstream_url" tags/full \
2>../err
) &&
grep "points to a different object" err &&
grep "Are you sure you pushed" err
'
test_done