git-commit-vandalism/t/t2025-checkout-no-overlay.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='checkout --no-overlay <tree-ish> -- <pathspec>'
TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
test_expect_success 'setup' '
git commit --allow-empty -m "initial"
'
test_expect_success 'checkout --no-overlay deletes files not in <tree-ish>' '
>file &&
mkdir dir &&
>dir/file1 &&
git add file dir/file1 &&
git checkout --no-overlay HEAD -- file &&
test_path_is_missing file &&
test_path_is_file dir/file1
'
test_expect_success 'checkout --no-overlay removing last file from directory' '
git checkout --no-overlay HEAD -- dir/file1 &&
test_path_is_missing dir
'
test_expect_success 'checkout -p --overlay is disallowed' '
test_must_fail git checkout -p --overlay HEAD 2>actual &&
test_i18ngrep "fatal: options .-p. and .--overlay. cannot be used together" actual
'
test_expect_success '--no-overlay --theirs with D/F conflict deletes file' '
test_commit file1 file1 &&
test_commit file2 file2 &&
git rm --cached file1 &&
echo 1234 >file1 &&
F1=$(git rev-parse HEAD:file1) &&
F2=$(git rev-parse HEAD:file2) &&
{
echo "100644 $F1 1 file1" &&
echo "100644 $F2 2 file1"
} | git update-index --index-info &&
test_path_is_file file1 &&
git checkout --theirs --no-overlay -- file1 &&
test_path_is_missing file1
'
test_expect_success 'wildcard pathspec matches file in subdirectory' '
git reset --hard &&
mkdir subdir &&
test_commit file3-1 subdir/file3 &&
test_commit file3-2 subdir/file3 &&
git checkout --no-overlay file3-1 "*file3" &&
echo file3-1 >expect &&
test_path_is_file subdir/file3 &&
test_cmp expect subdir/file3
'
test_done