@matheusbsbs / matheus-bagliano / commits / 8e0a1ec076

builtin/maintenance: introduce "reflog-expire" task

By default, git-maintenance(1) uses the "gc" task to ensure that the repository is well-maintained. This can be changed, for example by either explicitly configuring which tasks should be enabled or by using the "incremental" maintenance strategy. If so, git-maintenance(1) does not know to expire reflog entries, which is a subtask that git-gc(1) knows to perform for the user. Consequently, the reflog will grow indefinitely unless the user manually trims it. Introduce a new "reflog-expire" task that plugs this gap: - When running the task directly, then we simply execute `git reflog expire --all`, which is the same as git-gc(1). - When running git-maintenance(1) with the `--auto` flag, then we only run the task in case the "HEAD" reflog has at least N reflog entries that would be discarded. By default, N is set to 100, but this can be configured via "maintenance.reflog-expire.auto". When a negative integer has been provided we always expire entries, zero causes us to never expire entries, and a positive value specifies how many entries need to exist before we consider pruning the entries. Note that the condition for the `--auto` flags is merely a heuristic and optimized for being fast. This is because `git maintenance run --auto` will be executed quite regularly, so scanning through all reflogs would likely be too expensive in many repositories. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Patrick Steinhardt committed Apr 8, 2025 at 08:22 UTC 8e0a1ec0762405e045d924eed68b872fd29844c9

4 files changed +81

Documentation/config/maintenance.adoc

index 72a9d6cf81..e57f346a06 100644 --- a/Documentation/config/maintenance.adoc +++ b/Documentation/config/maintenance.adoc @@ -69,3 +69,12 @@ maintenance.incremental-repack.auto:: Otherwise, a positive value implies the command should run when the number of pack-files not in the multi-pack-index is at least the value of `maintenance.incremental-repack.auto`. The default value is 10. + +maintenance.reflog-expire.auto:: + This integer config option controls how often the `reflog-expire` task + should be run as part of `git maintenance run --auto`. If zero, then + the `reflog-expire` task will not run with the `--auto` option. A + negative value will force the task to run every time. Otherwise, a + positive value implies the command should run when the number of + expired reflog entries in the "HEAD" reflog is at least the value of + `maintenance.loose-objects.auto`. The default value is 100.

Documentation/git-maintenance.adoc

index 0450d74aff..8bc94a6d4f 100644 --- a/Documentation/git-maintenance.adoc +++ b/Documentation/git-maintenance.adoc @@ -158,6 +158,10 @@ pack-refs:: need to iterate across many references. See linkgit:git-pack-refs[1] for more information. +reflog-expire:: + The `reflog-expire` task deletes any entries in the reflog older than the + expiry threshold. See linkgit:git-reflog[1] for more information. + OPTIONS ------- --auto::

builtin/gc.c

+50

index e8f5705dc5..ce5bb2630f 100644 --- a/builtin/gc.c +++ b/builtin/gc.c @@ -33,6 +33,7 @@ #include "pack.h" #include "pack-objects.h" #include "path.h" +#include "reflog.h" #include "blob.h" #include "tree.h" #include "promisor-remote.h" @@ -285,6 +286,49 @@ static int maintenance_task_pack_refs(struct maintenance_run_opts *opts, return run_command(&cmd); } +struct count_reflog_entries_data { + struct expire_reflog_policy_cb policy; + size_t count; + size_t limit; +}; + +static int count_reflog_entries(struct object_id *old_oid, struct object_id *new_oid, + const char *committer, timestamp_t timestamp, + int tz, const char *msg, void *cb_data) +{ + struct count_reflog_entries_data *data = cb_data; + if (should_expire_reflog_ent(old_oid, new_oid, committer, timestamp, tz, msg, &data->policy)) + data->count++; + return data->count >= data->limit; +} + +static int reflog_expire_condition(struct gc_config *cfg UNUSED) +{ + timestamp_t now = time(NULL); + struct count_reflog_entries_data data = { + .policy = { + .opts = REFLOG_EXPIRE_OPTIONS_INIT(now), + }, + }; + int limit = 100; + + git_config_get_int("maintenance.reflog-expire.auto", &limit); + if (!limit) + return 0; + if (limit < 0) + return 1; + data.limit = limit; + + repo_config(the_repository, reflog_expire_config, &data.policy.opts); + + reflog_expire_options_set_refname(&data.policy.opts, "HEAD"); + refs_for_each_reflog_ent(get_main_ref_store(the_repository), "HEAD", + count_reflog_entries, &data); + + reflog_expiry_cleanup(&data.policy); + return data.count >= data.limit; +} + static int maintenance_task_reflog_expire(struct maintenance_run_opts *opts UNUSED, struct gc_config *cfg UNUSED) { @@ -1383,6 +1427,7 @@ enum maintenance_task_label { TASK_GC, TASK_COMMIT_GRAPH, TASK_PACK_REFS, + TASK_REFLOG_EXPIRE, /* Leave as final value */ TASK__COUNT @@ -1419,6 +1464,11 @@ static struct maintenance_task tasks[] = { maintenance_task_pack_refs, pack_refs_condition, }, + [TASK_REFLOG_EXPIRE] = { + "reflog-expire", + maintenance_task_reflog_expire, + reflog_expire_condition, + }, }; static int compare_tasks_by_selection(const void *a_, const void *b_)

t/t7900-maintenance.sh

+18

index 1909aed95e..ff98cde92c 100755 --- a/t/t7900-maintenance.sh +++ b/t/t7900-maintenance.sh @@ -447,6 +447,24 @@ test_expect_success 'pack-refs task' ' test_subcommand git pack-refs --all --prune <pack-refs.txt ' +test_expect_success 'reflog-expire task' ' + GIT_TRACE2_EVENT="$(pwd)/reflog-expire.txt" \ + git maintenance run --task=reflog-expire && + test_subcommand git reflog expire --all <reflog-expire.txt +' + +test_expect_success 'reflog-expire task --auto only packs when exceeding limits' ' + git reflog expire --all --expire=now && + test_commit reflog-one && + test_commit reflog-two && + GIT_TRACE2_EVENT="$(pwd)/reflog-expire-auto.txt" \ + git -c maintenance.reflog-expire.auto=3 maintenance run --auto --task=reflog-expire && + test_subcommand ! git reflog expire --all <reflog-expire-auto.txt && + GIT_TRACE2_EVENT="$(pwd)/reflog-expire-auto.txt" \ + git -c maintenance.reflog-expire.auto=2 maintenance run --auto --task=reflog-expire && + test_subcommand git reflog expire --all <reflog-expire-auto.txt +' + test_expect_success '--auto and --schedule incompatible' ' test_must_fail git maintenance run --auto --schedule=daily 2>err && test_grep "at most one" err