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transport-helper: report errors properly

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If a push fails because the remote-helper died (with fast-export),
the user may not see any error message. We do correctly die with a
failed exit code, as we notice that the helper has died while
reading back the ref status from the helper. However, we don't print
any message. This is OK if the helper itself printed a useful error
message, but we cannot count on that; let's let the user know that
the helper failed.

In the long run, it may make more sense to propagate the error back
up to push, so that it can present the usual status table and give a
nicer message. But this is a much simpler fix that can help
immediately.

While we're adding tests, let's also confirm that the remote-helper
dying is also detected when importing refs. We currently do so
robustly when the helper uses the "done" feature (and that is what
we test).  We cannot do so reliably when the helper does not use the
"done" feature, but it is not even worth testing; the right solution
is for the helper to start using "done".

Suggested-by: Jeff King <peff@peff.net>
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Jeff King <peff@peff.net>
Acked-by: Sverre Rabbelier <srabbelier@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Felipe Contreras 2013-04-10 17:15:52 -04:00 committed by Junio C Hamano
parent 52a3e011c7
commit 81d340d40a
3 changed files with 40 additions and 1 deletions
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19
git-remote-testgit
View File

@ -61,12 +61,31 @@ do
echo "feature import-marks=$gitmarks"
echo "feature export-marks=$gitmarks"
fi
if test -n "$GIT_REMOTE_TESTGIT_FAILURE"
then
echo "feature done"
exit 1
fi
echo "feature done"
git fast-export "${testgitmarks_args[@]}" $refs |
sed -e "s#refs/heads/#${prefix}/heads/#g"
echo "done"
;;
export)
if test -n "$GIT_REMOTE_TESTGIT_FAILURE"
then
# consume input so fast-export doesn't get SIGPIPE;
# git would also notice that case, but we want
# to make sure we are exercising the later
# error checks
while read line; do
test "done" = "$line" && break
done
exit 1
fi
before=$(git for-each-ref --format='%(refname) %(objectname)')
git fast-import "${testgitmarks_args[@]}" --quiet

20
t/t5801-remote-helpers.sh
View File

@ -166,4 +166,24 @@ test_expect_success 'push ref with existing object' '
compare_refs local dup server dup
'
test_expect_success 'proper failure checks for fetching' '
(GIT_REMOTE_TESTGIT_FAILURE=1 &&
export GIT_REMOTE_TESTGIT_FAILURE &&
cd local &&
test_must_fail git fetch 2> error &&
cat error &&
grep -q "Error while running fast-import" error
)
'
test_expect_success 'proper failure checks for pushing' '
(GIT_REMOTE_TESTGIT_FAILURE=1 &&
export GIT_REMOTE_TESTGIT_FAILURE &&
cd local &&
test_must_fail git push --all 2> error &&
cat error &&
grep -q "Reading from remote helper failed" error
)
'
test_done

2
transport-helper.c
View File

@ -54,7 +54,7 @@ static int recvline_fh(FILE *helper, struct strbuf *buffer)
if (strbuf_getline(buffer, helper, '\n') == EOF) {
if (debug)
fprintf(stderr, "Debug: Remote helper quit.\n");
exit(128);
die("Reading from remote helper failed");
}
if (debug)