format-patch: inform user that patch-id generation is unstable

diff --git a/t/t6500-gc.sh b/t/t6500-gc.sh
index 818435f04e49b50965cd674bf046eb3d494fa939..7411bf7fecd89984c7256668863c9f96bb75efbf 100755 (executable)
--- a/t/t6500-gc.sh
+++ b/t/t6500-gc.sh
@@ -4,6 +4,7 @@ test_description='basic git gc tests
 '
 
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-terminal.sh
 
 test_expect_success 'setup' '
        # do not let the amount of physical memory affects gc
@@ -99,6 +100,45 @@ test_expect_success 'auto gc with too many loose objects does not attempt to cre
        test_line_count = 2 new # There is one new pack and its .idx
 '
 
+test_expect_success 'gc --no-quiet' '
+       git -c gc.writeCommitGraph=true gc --no-quiet >stdout 2>stderr &&
+       test_must_be_empty stdout &&
+       test_line_count = 1 stderr &&
+       test_i18ngrep "Computing commit graph generation numbers" stderr
+'
+
+test_expect_success TTY 'with TTY: gc --no-quiet' '
+       test_terminal git -c gc.writeCommitGraph=true gc --no-quiet >stdout 2>stderr &&
+       test_must_be_empty stdout &&
+       test_i18ngrep "Enumerating objects" stderr &&
+       test_i18ngrep "Computing commit graph generation numbers" stderr
+'
+
+test_expect_success 'gc --quiet' '
+       git -c gc.writeCommitGraph=true gc --quiet >stdout 2>stderr &&
+       test_must_be_empty stdout &&
+       test_must_be_empty stderr
+'
+
+test_expect_success 'gc.reflogExpire{Unreachable,}=never skips "expire" via "gc"' '
+       test_config gc.reflogExpire never &&
+       test_config gc.reflogExpireUnreachable never &&
+
+       GIT_TRACE=$(pwd)/trace.out git gc &&
+
+       # Check that git-pack-refs is run as a sanity check (done via
+       # gc_before_repack()) but that git-expire is not.
+       grep -E "^trace: (built-in|exec|run_command): git pack-refs --" trace.out &&
+       ! grep -E "^trace: (built-in|exec|run_command): git reflog expire --" trace.out
+'
+
+test_expect_success 'one of gc.reflogExpire{Unreachable,}=never does not skip "expire" via "gc"' '
+       >trace.out &&
+       test_config gc.reflogExpire never &&
+       GIT_TRACE=$(pwd)/trace.out git gc &&
+       grep -E "^trace: (built-in|exec|run_command): git reflog expire --" trace.out
+'
+
 run_and_wait_for_auto_gc () {
        # We read stdout from gc for the side effect of waiting until the
        # background gc process exits, closing its fd 9.  Furthermore, the
@@ -116,11 +156,11 @@ test_expect_success 'background auto gc does not run if gc.log is present and re
        test_config gc.autopacklimit 1 &&
        test_config gc.autodetach true &&
        echo fleem >.git/gc.log &&
-       test_must_fail git gc --auto 2>err &&
-       test_i18ngrep "^error:" err &&
+       git gc --auto 2>err &&
+       test_i18ngrep "^warning:" err &&
        test_config gc.logexpiry 5.days &&
        test-tool chmtime =-345600 .git/gc.log &&
-       test_must_fail git gc --auto &&
+       git gc --auto &&
        test_config gc.logexpiry 2.days &&
        run_and_wait_for_auto_gc &&
        ls .git/objects/pack/pack-*.pack >packs &&