git/t/t1413-reflog-detach.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 reflog interaction with detached HEAD'
GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
reset_state () {
rm -rf .git && "$TAR" xf .git-saved.tar
}
test_expect_success setup '
test_tick &&
git commit --allow-empty -m initial &&
git branch side &&
test_tick &&
git commit --allow-empty -m second &&
"$TAR" cf .git-saved.tar .git
'
test_expect_success baseline '
reset_state &&
git rev-parse main main^ >expect &&
git log -g --format=%H >actual &&
test_cmp expect actual
'
test_expect_success 'switch to branch' '
reset_state &&
git rev-parse side main main^ >expect &&
git checkout side &&
git log -g --format=%H >actual &&
test_cmp expect actual
'
test_expect_success 'detach to other' '
reset_state &&
git rev-parse main side main main^ >expect &&
git checkout side &&
git checkout main^0 &&
git log -g --format=%H >actual &&
test_cmp expect actual
'
test_expect_success 'detach to self' '
reset_state &&
git rev-parse main main main^ >expect &&
git checkout main^0 &&
git log -g --format=%H >actual &&
test_cmp expect actual
'
test_expect_success 'attach to self' '
reset_state &&
git rev-parse main main main main^ >expect &&
git checkout main^0 &&
git checkout main &&
git log -g --format=%H >actual &&
test_cmp expect actual
'
test_expect_success 'attach to other' '
reset_state &&
git rev-parse side main main main^ >expect &&
git checkout main^0 &&
git checkout side &&
git log -g --format=%H >actual &&
test_cmp expect actual
'
test_done