git/t/t5618-alternate-refs.sh
Ævar Arnfjörð Bjarmason 03267e8656 commit: discard partial cache before (re-)reading it
The read_cache() in prepare_to_commit() would end up clobbering the
pointer we had for a previously populated "the_index.cache_tree" in
the very common case of "git commit" stressed by e.g. the tests being
changed here.

We'd populate "the_index.cache_tree" by calling
"update_main_cache_tree" in prepare_index(), but would not end up with
a "fully prepared" index. What constitutes an existing index is
clearly overly fuzzy, here we'll check "active_nr" (aka
"the_index.cache_nr"), but our "the_index.cache_tree" might have been
malloc()'d already.

Thus the code added in 11c8a74a64 (commit: write cache-tree data when
writing index anyway, 2011-12-06) would end up allocating the
"cache_tree", and would interact here with code added in
7168624c35 (Do not generate full commit log message if it is not
going to be used, 2007-11-28). The result was a very common memory
leak.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
2022-11-21 12:32:48 +09:00

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#!/bin/sh
test_description='test handling of --alternate-refs traversal'
TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
# Avoid test_commit because we want a specific and known set of refs:
#
# base -- one
# \ \
# two -- merged
#
# where "one" and "two" are on separate refs, and "merged" is available only in
# the dependent child repository.
test_expect_success 'set up local refs' '
git checkout -b one &&
test_tick &&
git commit --allow-empty -m base &&
test_tick &&
git commit --allow-empty -m one &&
git checkout -b two HEAD^ &&
test_tick &&
git commit --allow-empty -m two
'
# We'll enter the child repository after it's set up since that's where
# all of the subsequent tests will want to run (and it's easy to forget a
# "-C child" and get nonsense results).
test_expect_success 'set up shared clone' '
git clone -s . child &&
cd child &&
git merge origin/one
'
test_expect_success 'rev-list --alternate-refs' '
git rev-list --remotes=origin >expect &&
git rev-list --alternate-refs >actual &&
test_cmp expect actual
'
test_expect_success 'rev-list --not --alternate-refs' '
git rev-parse HEAD >expect &&
git rev-list HEAD --not --alternate-refs >actual &&
test_cmp expect actual
'
test_expect_success 'limiting with alternateRefsPrefixes' '
test_config core.alternateRefsPrefixes refs/heads/one &&
git rev-list origin/one >expect &&
git rev-list --alternate-refs >actual &&
test_cmp expect actual
'
test_expect_success 'log --source shows .alternate marker' '
git log --oneline --source --remotes=origin >expect.orig &&
sed "s/origin.* /.alternate /" <expect.orig >expect &&
git log --oneline --source --alternate-refs >actual &&
test_cmp expect actual
'
test_done