From patchwork Wed Mar 2 22:27:23 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: John Cai X-Patchwork-Id: 12766881 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 65412C433F5 for ; Wed, 2 Mar 2022 22:27:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235961AbiCBW2Z (ORCPT ); Wed, 2 Mar 2022 17:28:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49546 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235906AbiCBW2P (ORCPT ); Wed, 2 Mar 2022 17:28:15 -0500 Received: from mail-wm1-x332.google.com (mail-wm1-x332.google.com [IPv6:2a00:1450:4864:20::332]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BC3A213D5D for ; Wed, 2 Mar 2022 14:27:28 -0800 (PST) Received: by mail-wm1-x332.google.com with SMTP id r10-20020a1c440a000000b00386f2897400so453677wma.5 for ; Wed, 02 Mar 2022 14:27:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=message-id:in-reply-to:references:from:date:subject:mime-version :content-transfer-encoding:fcc:to:cc; bh=KpOjNOAFZg7ax3GBpPfoZjk+pxLki7xXiG3ZQ4bgPKM=; b=lXWGSaFzTDuZyTaQlTu4mhZRbCHEmoAONNVU6j704BaP1YWWF84HNcFFNztCZHFI7i dR/jbH60UAjPLqMzVkDGpfX1RWJzYnTdROxjlVftZytBtXkv+Z1Do4Fn5vE+TfaCEC3U aai5J7By8fRwIZ4GvV9uOMS7yrvsK4A/nZT/vOhHmkkl4Pu21VMgaxsZUOX4cNqXr2PZ Y+y9Lree56+s5l/Elurm8WZhR8PYmrVbLghfFrKvgW0WQ1B/TbmerO3yz6ifYhIcBreg 5UeVathx9eDusELHizMK6Fu0dflFkMEA6OHn4HQQ7OFNsQOVrXIFbxSaeJGOuE/b6oqJ agGA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:in-reply-to:references:from:date :subject:mime-version:content-transfer-encoding:fcc:to:cc; bh=KpOjNOAFZg7ax3GBpPfoZjk+pxLki7xXiG3ZQ4bgPKM=; b=PUg+7Ur3KKbjZjXIQFshCkp8dWrFLmv8RABHUEZqm1065yMMCa0ZBpUDxeAE4tGS3E gmpyCSfBvYYmeqxi8MioUCpuF5cmMSoCVeiQQu9uzknVaE75+Suan6H1WAlKySV1eS8y odvZ98XZtx5dqDXe/h0xw9VSXINDxnyCMFLhtytCW6PQxCKzMlLWbRRWhFWy3S8Ygo0U iFo5x2AocfKQ+Nc0ezdH3uPp117RA3JfcTOo1TeLrZ0XAQDZ0C5E7BqPV7rqP7AjrZhF tptrgiAq/I84drufQCNjUbfMGW2C5m4I9yEK/aPMtTqrShW4aisdoIo83R38LmWVQBVj WPHg== X-Gm-Message-State: AOAM530X40TKvl81YTwux9vDHXonNzILDBGlstE9Uo8Cit6MvmA0oQyT HP9H5lZZsWyvEVLTm81xvkQhkh142X8= X-Google-Smtp-Source: ABdhPJzBr7H8VETgHRq9OziyQHwJnTQgMcZK516NqfUrvFAt0Cc7XGApRGgYIOa8vEIx5hSINAjfkQ== X-Received: by 2002:a05:600c:3787:b0:386:aa15:7117 with SMTP id o7-20020a05600c378700b00386aa157117mr1561590wmr.113.1646260046805; Wed, 02 Mar 2022 14:27:26 -0800 (PST) Received: from [127.0.0.1] ([13.74.141.28]) by smtp.gmail.com with ESMTPSA id n10-20020a5d598a000000b001efab095615sm229353wri.29.2022.03.02.14.27.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Mar 2022 14:27:26 -0800 (PST) Message-Id: <50471c2ee6fb8897267d86c9fe655aabb564249c.1646260044.git.gitgitgadget@gmail.com> In-Reply-To: References: Date: Wed, 02 Mar 2022 22:27:23 +0000 Subject: [PATCH v4 2/3] reflog: libify delete reflog function and helpers MIME-Version: 1.0 Fcc: Sent To: git@vger.kernel.org Cc: =?utf-8?b?w4Z2YXIgQXJuZmrDtnLDsA==?= Bjarmason , Taylor Blau , John Cai , John Cai Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org From: John Cai From: John Cai Currently stash shells out to reflog in order to delete refs. In an effort to reduce how much we shell out to a subprocess, libify the functionality that stash needs into reflog.c. Add a reflog_delete function that is pretty much the logic in the while loop in builtin/reflog.c cmd_reflog_delete(). This is a function that builtin/reflog.c and builtin/stash.c can both call. Also move functions needed by reflog_delete and export them. Helped-by: Ævar Arnfjörð Bjarmason Signed-off-by: John Cai --- Makefile | 1 + builtin/reflog.c | 455 +---------------------------------------------- object.h | 2 +- reflog.c | 432 ++++++++++++++++++++++++++++++++++++++++++++ reflog.h | 43 +++++ 5 files changed, 481 insertions(+), 452 deletions(-) create mode 100644 reflog.c create mode 100644 reflog.h diff --git a/Makefile b/Makefile index 6f0b4b775fe..876d4dfd6cb 100644 --- a/Makefile +++ b/Makefile @@ -989,6 +989,7 @@ LIB_OBJS += rebase-interactive.o LIB_OBJS += rebase.o LIB_OBJS += ref-filter.o LIB_OBJS += reflog-walk.o +LIB_OBJS += reflog.o LIB_OBJS += refs.o LIB_OBJS += refs/debug.o LIB_OBJS += refs/files-backend.o diff --git a/builtin/reflog.c b/builtin/reflog.c index 85b838720c3..940db196f62 100644 --- a/builtin/reflog.c +++ b/builtin/reflog.c @@ -1,16 +1,9 @@ #include "builtin.h" #include "config.h" -#include "lockfile.h" -#include "object-store.h" -#include "repository.h" -#include "commit.h" -#include "refs.h" -#include "dir.h" -#include "tree-walk.h" -#include "diff.h" #include "revision.h" #include "reachable.h" #include "worktree.h" +#include "reflog.h" static const char reflog_exists_usage[] = N_("git reflog exists "); @@ -18,404 +11,11 @@ N_("git reflog exists "); static timestamp_t default_reflog_expire; static timestamp_t default_reflog_expire_unreachable; -struct cmd_reflog_expire_cb { - int stalefix; - int explicit_expiry; - timestamp_t expire_total; - timestamp_t expire_unreachable; - int recno; -}; - -struct expire_reflog_policy_cb { - enum { - UE_NORMAL, - UE_ALWAYS, - UE_HEAD - } unreachable_expire_kind; - struct commit_list *mark_list; - unsigned long mark_limit; - struct cmd_reflog_expire_cb cmd; - struct commit *tip_commit; - struct commit_list *tips; - unsigned int dry_run:1; -}; - struct worktree_reflogs { struct worktree *worktree; struct string_list reflogs; }; -/* Remember to update object flag allocation in object.h */ -#define INCOMPLETE (1u<<10) -#define STUDYING (1u<<11) -#define REACHABLE (1u<<12) - -static int tree_is_complete(const struct object_id *oid) -{ - struct tree_desc desc; - struct name_entry entry; - int complete; - struct tree *tree; - - tree = lookup_tree(the_repository, oid); - if (!tree) - return 0; - if (tree->object.flags & SEEN) - return 1; - if (tree->object.flags & INCOMPLETE) - return 0; - - if (!tree->buffer) { - enum object_type type; - unsigned long size; - void *data = read_object_file(oid, &type, &size); - if (!data) { - tree->object.flags |= INCOMPLETE; - return 0; - } - tree->buffer = data; - tree->size = size; - } - init_tree_desc(&desc, tree->buffer, tree->size); - complete = 1; - while (tree_entry(&desc, &entry)) { - if (!has_object_file(&entry.oid) || - (S_ISDIR(entry.mode) && !tree_is_complete(&entry.oid))) { - tree->object.flags |= INCOMPLETE; - complete = 0; - } - } - free_tree_buffer(tree); - - if (complete) - tree->object.flags |= SEEN; - return complete; -} - -static int commit_is_complete(struct commit *commit) -{ - struct object_array study; - struct object_array found; - int is_incomplete = 0; - int i; - - /* early return */ - if (commit->object.flags & SEEN) - return 1; - if (commit->object.flags & INCOMPLETE) - return 0; - /* - * Find all commits that are reachable and are not marked as - * SEEN. Then make sure the trees and blobs contained are - * complete. After that, mark these commits also as SEEN. - * If some of the objects that are needed to complete this - * commit are missing, mark this commit as INCOMPLETE. - */ - memset(&study, 0, sizeof(study)); - memset(&found, 0, sizeof(found)); - add_object_array(&commit->object, NULL, &study); - add_object_array(&commit->object, NULL, &found); - commit->object.flags |= STUDYING; - while (study.nr) { - struct commit *c; - struct commit_list *parent; - - c = (struct commit *)object_array_pop(&study); - if (!c->object.parsed && !parse_object(the_repository, &c->object.oid)) - c->object.flags |= INCOMPLETE; - - if (c->object.flags & INCOMPLETE) { - is_incomplete = 1; - break; - } - else if (c->object.flags & SEEN) - continue; - for (parent = c->parents; parent; parent = parent->next) { - struct commit *p = parent->item; - if (p->object.flags & STUDYING) - continue; - p->object.flags |= STUDYING; - add_object_array(&p->object, NULL, &study); - add_object_array(&p->object, NULL, &found); - } - } - if (!is_incomplete) { - /* - * make sure all commits in "found" array have all the - * necessary objects. - */ - for (i = 0; i < found.nr; i++) { - struct commit *c = - (struct commit *)found.objects[i].item; - if (!tree_is_complete(get_commit_tree_oid(c))) { - is_incomplete = 1; - c->object.flags |= INCOMPLETE; - } - } - if (!is_incomplete) { - /* mark all found commits as complete, iow SEEN */ - for (i = 0; i < found.nr; i++) - found.objects[i].item->flags |= SEEN; - } - } - /* clear flags from the objects we traversed */ - for (i = 0; i < found.nr; i++) - found.objects[i].item->flags &= ~STUDYING; - if (is_incomplete) - commit->object.flags |= INCOMPLETE; - else { - /* - * If we come here, we have (1) traversed the ancestry chain - * from the "commit" until we reach SEEN commits (which are - * known to be complete), and (2) made sure that the commits - * encountered during the above traversal refer to trees that - * are complete. Which means that we know *all* the commits - * we have seen during this process are complete. - */ - for (i = 0; i < found.nr; i++) - found.objects[i].item->flags |= SEEN; - } - /* free object arrays */ - object_array_clear(&study); - object_array_clear(&found); - return !is_incomplete; -} - -static int keep_entry(struct commit **it, struct object_id *oid) -{ - struct commit *commit; - - if (is_null_oid(oid)) - return 1; - commit = lookup_commit_reference_gently(the_repository, oid, 1); - if (!commit) - return 0; - - /* - * Make sure everything in this commit exists. - * - * We have walked all the objects reachable from the refs - * and cache earlier. The commits reachable by this commit - * must meet SEEN commits -- and then we should mark them as - * SEEN as well. - */ - if (!commit_is_complete(commit)) - return 0; - *it = commit; - return 1; -} - -/* - * Starting from commits in the cb->mark_list, mark commits that are - * reachable from them. Stop the traversal at commits older than - * the expire_limit and queue them back, so that the caller can call - * us again to restart the traversal with longer expire_limit. - */ -static void mark_reachable(struct expire_reflog_policy_cb *cb) -{ - struct commit_list *pending; - timestamp_t expire_limit = cb->mark_limit; - struct commit_list *leftover = NULL; - - for (pending = cb->mark_list; pending; pending = pending->next) - pending->item->object.flags &= ~REACHABLE; - - pending = cb->mark_list; - while (pending) { - struct commit_list *parent; - struct commit *commit = pop_commit(&pending); - if (commit->object.flags & REACHABLE) - continue; - if (parse_commit(commit)) - continue; - commit->object.flags |= REACHABLE; - if (commit->date < expire_limit) { - commit_list_insert(commit, &leftover); - continue; - } - commit->object.flags |= REACHABLE; - parent = commit->parents; - while (parent) { - commit = parent->item; - parent = parent->next; - if (commit->object.flags & REACHABLE) - continue; - commit_list_insert(commit, &pending); - } - } - cb->mark_list = leftover; -} - -static int unreachable(struct expire_reflog_policy_cb *cb, struct commit *commit, struct object_id *oid) -{ - /* - * We may or may not have the commit yet - if not, look it - * up using the supplied sha1. - */ - if (!commit) { - if (is_null_oid(oid)) - return 0; - - commit = lookup_commit_reference_gently(the_repository, oid, - 1); - - /* Not a commit -- keep it */ - if (!commit) - return 0; - } - - /* Reachable from the current ref? Don't prune. */ - if (commit->object.flags & REACHABLE) - return 0; - - if (cb->mark_list && cb->mark_limit) { - cb->mark_limit = 0; /* dig down to the root */ - mark_reachable(cb); - } - - return !(commit->object.flags & REACHABLE); -} - -/* - * Return true iff the specified reflog entry should be expired. - */ -static int should_expire_reflog_ent(struct object_id *ooid, struct object_id *noid, - const char *email, timestamp_t timestamp, int tz, - const char *message, void *cb_data) -{ - struct expire_reflog_policy_cb *cb = cb_data; - struct commit *old_commit, *new_commit; - - if (timestamp < cb->cmd.expire_total) - return 1; - - old_commit = new_commit = NULL; - if (cb->cmd.stalefix && - (!keep_entry(&old_commit, ooid) || !keep_entry(&new_commit, noid))) - return 1; - - if (timestamp < cb->cmd.expire_unreachable) { - switch (cb->unreachable_expire_kind) { - case UE_ALWAYS: - return 1; - case UE_NORMAL: - case UE_HEAD: - if (unreachable(cb, old_commit, ooid) || unreachable(cb, new_commit, noid)) - return 1; - break; - } - } - - if (cb->cmd.recno && --(cb->cmd.recno) == 0) - return 1; - - return 0; -} - -static int should_expire_reflog_ent_verbose(struct object_id *ooid, - struct object_id *noid, - const char *email, - timestamp_t timestamp, int tz, - const char *message, void *cb_data) -{ - struct expire_reflog_policy_cb *cb = cb_data; - int expire; - - expire = should_expire_reflog_ent(ooid, noid, email, timestamp, tz, - message, cb); - - if (!expire) - printf("keep %s", message); - else if (cb->dry_run) - printf("would prune %s", message); - else - printf("prune %s", message); - - return expire; -} - -static int push_tip_to_list(const char *refname, const struct object_id *oid, - int flags, void *cb_data) -{ - struct commit_list **list = cb_data; - struct commit *tip_commit; - if (flags & REF_ISSYMREF) - return 0; - tip_commit = lookup_commit_reference_gently(the_repository, oid, 1); - if (!tip_commit) - return 0; - commit_list_insert(tip_commit, list); - return 0; -} - -static int is_head(const char *refname) -{ - switch (ref_type(refname)) { - case REF_TYPE_OTHER_PSEUDOREF: - case REF_TYPE_MAIN_PSEUDOREF: - if (parse_worktree_ref(refname, NULL, NULL, &refname)) - BUG("not a worktree ref: %s", refname); - break; - default: - break; - } - return !strcmp(refname, "HEAD"); -} - -static void reflog_expiry_prepare(const char *refname, - const struct object_id *oid, - void *cb_data) -{ - struct expire_reflog_policy_cb *cb = cb_data; - struct commit_list *elem; - struct commit *commit = NULL; - - if (!cb->cmd.expire_unreachable || is_head(refname)) { - cb->unreachable_expire_kind = UE_HEAD; - } else { - commit = lookup_commit(the_repository, oid); - cb->unreachable_expire_kind = commit ? UE_NORMAL : UE_ALWAYS; - } - - if (cb->cmd.expire_unreachable <= cb->cmd.expire_total) - cb->unreachable_expire_kind = UE_ALWAYS; - - switch (cb->unreachable_expire_kind) { - case UE_ALWAYS: - return; - case UE_HEAD: - for_each_ref(push_tip_to_list, &cb->tips); - for (elem = cb->tips; elem; elem = elem->next) - commit_list_insert(elem->item, &cb->mark_list); - break; - case UE_NORMAL: - commit_list_insert(commit, &cb->mark_list); - /* For reflog_expiry_cleanup() below */ - cb->tip_commit = commit; - } - cb->mark_limit = cb->cmd.expire_total; - mark_reachable(cb); -} - -static void reflog_expiry_cleanup(void *cb_data) -{ - struct expire_reflog_policy_cb *cb = cb_data; - struct commit_list *elem; - - switch (cb->unreachable_expire_kind) { - case UE_ALWAYS: - return; - case UE_HEAD: - for (elem = cb->tips; elem; elem = elem->next) - clear_commit_marks(elem->item, REACHABLE); - free_commit_list(cb->tips); - break; - case UE_NORMAL: - clear_commit_marks(cb->tip_commit, REACHABLE); - break; - } -} - static int collect_reflog(const char *ref, const struct object_id *oid, int unused, void *cb_data) { struct worktree_reflogs *cb = cb_data; @@ -704,16 +304,6 @@ static int cmd_reflog_expire(int argc, const char **argv, const char *prefix) return status; } -static int count_reflog_ent(struct object_id *ooid, struct object_id *noid, - const char *email, timestamp_t timestamp, int tz, - const char *message, void *cb_data) -{ - struct cmd_reflog_expire_cb *cb = cb_data; - if (!cb->expire_total || timestamp < cb->expire_total) - cb->recno++; - return 0; -} - static const char * reflog_delete_usage[] = { N_("git reflog delete [--rewrite] [--updateref] " "[--dry-run | -n] [--verbose] ..."), @@ -722,11 +312,10 @@ static const char * reflog_delete_usage[] = { static int cmd_reflog_delete(int argc, const char **argv, const char *prefix) { - struct cmd_reflog_expire_cb cmd = { 0 }; int i, status = 0; unsigned int flags = 0; int verbose = 0; - reflog_expiry_should_prune_fn *should_prune_fn = should_expire_reflog_ent; + const struct option options[] = { OPT_BIT(0, "dry-run", &flags, N_("do not actually prune any entries"), EXPIRE_REFLOGS_DRY_RUN), @@ -742,48 +331,12 @@ static int cmd_reflog_delete(int argc, const char **argv, const char *prefix) argc = parse_options(argc, argv, prefix, options, reflog_delete_usage, 0); - if (verbose) - should_prune_fn = should_expire_reflog_ent_verbose; - if (argc < 1) return error(_("no reflog specified to delete")); - for (i = 0; i < argc; i++) { - const char *spec = strstr(argv[i], "@{"); - char *ep, *ref; - int recno; - struct expire_reflog_policy_cb cb = { - .dry_run = !!(flags & EXPIRE_REFLOGS_DRY_RUN), - }; - - if (!spec) { - status |= error(_("not a reflog: %s"), argv[i]); - continue; - } + for (i = 0; i < argc; i++) + status |= reflog_delete(argv[i], flags, verbose); - if (!dwim_log(argv[i], spec - argv[i], NULL, &ref)) { - status |= error(_("no reflog for '%s'"), argv[i]); - continue; - } - - recno = strtoul(spec + 2, &ep, 10); - if (*ep == '}') { - cmd.recno = -recno; - for_each_reflog_ent(ref, count_reflog_ent, &cmd); - } else { - cmd.expire_total = approxidate(spec + 2); - for_each_reflog_ent(ref, count_reflog_ent, &cmd); - cmd.expire_total = 0; - } - - cb.cmd = cmd; - status |= reflog_expire(ref, flags, - reflog_expiry_prepare, - should_prune_fn, - reflog_expiry_cleanup, - &cb); - free(ref); - } return status; } diff --git a/object.h b/object.h index cb556ab7753..a2219464c2b 100644 --- a/object.h +++ b/object.h @@ -75,7 +75,7 @@ struct object_array { * builtin/fsck.c: 0--3 * builtin/gc.c: 0 * builtin/index-pack.c: 2021 - * builtin/reflog.c: 10--12 + * reflog.c: 10--12 * builtin/show-branch.c: 0-------------------------------------------26 * builtin/unpack-objects.c: 2021 */ diff --git a/reflog.c b/reflog.c new file mode 100644 index 00000000000..333fd8708fe --- /dev/null +++ b/reflog.c @@ -0,0 +1,432 @@ +#include "cache.h" +#include "object-store.h" +#include "reflog.h" +#include "refs.h" +#include "revision.h" +#include "worktree.h" + +/* Remember to update object flag allocation in object.h */ +#define INCOMPLETE (1u<<10) +#define STUDYING (1u<<11) +#define REACHABLE (1u<<12) + +static int tree_is_complete(const struct object_id *oid) +{ + struct tree_desc desc; + struct name_entry entry; + int complete; + struct tree *tree; + + tree = lookup_tree(the_repository, oid); + if (!tree) + return 0; + if (tree->object.flags & SEEN) + return 1; + if (tree->object.flags & INCOMPLETE) + return 0; + + if (!tree->buffer) { + enum object_type type; + unsigned long size; + void *data = read_object_file(oid, &type, &size); + if (!data) { + tree->object.flags |= INCOMPLETE; + return 0; + } + tree->buffer = data; + tree->size = size; + } + init_tree_desc(&desc, tree->buffer, tree->size); + complete = 1; + while (tree_entry(&desc, &entry)) { + if (!has_object_file(&entry.oid) || + (S_ISDIR(entry.mode) && !tree_is_complete(&entry.oid))) { + tree->object.flags |= INCOMPLETE; + complete = 0; + } + } + free_tree_buffer(tree); + + if (complete) + tree->object.flags |= SEEN; + return complete; +} + +static int commit_is_complete(struct commit *commit) +{ + struct object_array study; + struct object_array found; + int is_incomplete = 0; + int i; + + /* early return */ + if (commit->object.flags & SEEN) + return 1; + if (commit->object.flags & INCOMPLETE) + return 0; + /* + * Find all commits that are reachable and are not marked as + * SEEN. Then make sure the trees and blobs contained are + * complete. After that, mark these commits also as SEEN. + * If some of the objects that are needed to complete this + * commit are missing, mark this commit as INCOMPLETE. + */ + memset(&study, 0, sizeof(study)); + memset(&found, 0, sizeof(found)); + add_object_array(&commit->object, NULL, &study); + add_object_array(&commit->object, NULL, &found); + commit->object.flags |= STUDYING; + while (study.nr) { + struct commit *c; + struct commit_list *parent; + + c = (struct commit *)object_array_pop(&study); + if (!c->object.parsed && !parse_object(the_repository, &c->object.oid)) + c->object.flags |= INCOMPLETE; + + if (c->object.flags & INCOMPLETE) { + is_incomplete = 1; + break; + } + else if (c->object.flags & SEEN) + continue; + for (parent = c->parents; parent; parent = parent->next) { + struct commit *p = parent->item; + if (p->object.flags & STUDYING) + continue; + p->object.flags |= STUDYING; + add_object_array(&p->object, NULL, &study); + add_object_array(&p->object, NULL, &found); + } + } + if (!is_incomplete) { + /* + * make sure all commits in "found" array have all the + * necessary objects. + */ + for (i = 0; i < found.nr; i++) { + struct commit *c = + (struct commit *)found.objects[i].item; + if (!tree_is_complete(get_commit_tree_oid(c))) { + is_incomplete = 1; + c->object.flags |= INCOMPLETE; + } + } + if (!is_incomplete) { + /* mark all found commits as complete, iow SEEN */ + for (i = 0; i < found.nr; i++) + found.objects[i].item->flags |= SEEN; + } + } + /* clear flags from the objects we traversed */ + for (i = 0; i < found.nr; i++) + found.objects[i].item->flags &= ~STUDYING; + if (is_incomplete) + commit->object.flags |= INCOMPLETE; + else { + /* + * If we come here, we have (1) traversed the ancestry chain + * from the "commit" until we reach SEEN commits (which are + * known to be complete), and (2) made sure that the commits + * encountered during the above traversal refer to trees that + * are complete. Which means that we know *all* the commits + * we have seen during this process are complete. + */ + for (i = 0; i < found.nr; i++) + found.objects[i].item->flags |= SEEN; + } + /* free object arrays */ + object_array_clear(&study); + object_array_clear(&found); + return !is_incomplete; +} + +static int keep_entry(struct commit **it, struct object_id *oid) +{ + struct commit *commit; + + if (is_null_oid(oid)) + return 1; + commit = lookup_commit_reference_gently(the_repository, oid, 1); + if (!commit) + return 0; + + /* + * Make sure everything in this commit exists. + * + * We have walked all the objects reachable from the refs + * and cache earlier. The commits reachable by this commit + * must meet SEEN commits -- and then we should mark them as + * SEEN as well. + */ + if (!commit_is_complete(commit)) + return 0; + *it = commit; + return 1; +} + +/* + * Starting from commits in the cb->mark_list, mark commits that are + * reachable from them. Stop the traversal at commits older than + * the expire_limit and queue them back, so that the caller can call + * us again to restart the traversal with longer expire_limit. + */ +static void mark_reachable(struct expire_reflog_policy_cb *cb) +{ + struct commit_list *pending; + timestamp_t expire_limit = cb->mark_limit; + struct commit_list *leftover = NULL; + + for (pending = cb->mark_list; pending; pending = pending->next) + pending->item->object.flags &= ~REACHABLE; + + pending = cb->mark_list; + while (pending) { + struct commit_list *parent; + struct commit *commit = pop_commit(&pending); + if (commit->object.flags & REACHABLE) + continue; + if (parse_commit(commit)) + continue; + commit->object.flags |= REACHABLE; + if (commit->date < expire_limit) { + commit_list_insert(commit, &leftover); + continue; + } + commit->object.flags |= REACHABLE; + parent = commit->parents; + while (parent) { + commit = parent->item; + parent = parent->next; + if (commit->object.flags & REACHABLE) + continue; + commit_list_insert(commit, &pending); + } + } + cb->mark_list = leftover; +} + +static int unreachable(struct expire_reflog_policy_cb *cb, struct commit *commit, struct object_id *oid) +{ + /* + * We may or may not have the commit yet - if not, look it + * up using the supplied sha1. + */ + if (!commit) { + if (is_null_oid(oid)) + return 0; + + commit = lookup_commit_reference_gently(the_repository, oid, + 1); + + /* Not a commit -- keep it */ + if (!commit) + return 0; + } + + /* Reachable from the current ref? Don't prune. */ + if (commit->object.flags & REACHABLE) + return 0; + + if (cb->mark_list && cb->mark_limit) { + cb->mark_limit = 0; /* dig down to the root */ + mark_reachable(cb); + } + + return !(commit->object.flags & REACHABLE); +} + +/* + * Return true iff the specified reflog entry should be expired. + */ +int should_expire_reflog_ent(struct object_id *ooid, struct object_id *noid, + const char *email, timestamp_t timestamp, int tz, + const char *message, void *cb_data) +{ + struct expire_reflog_policy_cb *cb = cb_data; + struct commit *old_commit, *new_commit; + + if (timestamp < cb->cmd.expire_total) + return 1; + + old_commit = new_commit = NULL; + if (cb->cmd.stalefix && + (!keep_entry(&old_commit, ooid) || !keep_entry(&new_commit, noid))) + return 1; + + if (timestamp < cb->cmd.expire_unreachable) { + switch (cb->unreachable_expire_kind) { + case UE_ALWAYS: + return 1; + case UE_NORMAL: + case UE_HEAD: + if (unreachable(cb, old_commit, ooid) || unreachable(cb, new_commit, noid)) + return 1; + break; + } + } + + if (cb->cmd.recno && --(cb->cmd.recno) == 0) + return 1; + + return 0; +} + +int should_expire_reflog_ent_verbose(struct object_id *ooid, + struct object_id *noid, + const char *email, + timestamp_t timestamp, int tz, + const char *message, void *cb_data) +{ + struct expire_reflog_policy_cb *cb = cb_data; + int expire; + + expire = should_expire_reflog_ent(ooid, noid, email, timestamp, tz, + message, cb); + + if (!expire) + printf("keep %s", message); + else if (cb->dry_run) + printf("would prune %s", message); + else + printf("prune %s", message); + + return expire; +} + +static int push_tip_to_list(const char *refname, const struct object_id *oid, + int flags, void *cb_data) +{ + struct commit_list **list = cb_data; + struct commit *tip_commit; + if (flags & REF_ISSYMREF) + return 0; + tip_commit = lookup_commit_reference_gently(the_repository, oid, 1); + if (!tip_commit) + return 0; + commit_list_insert(tip_commit, list); + return 0; +} + +static int is_head(const char *refname) +{ + switch (ref_type(refname)) { + case REF_TYPE_OTHER_PSEUDOREF: + case REF_TYPE_MAIN_PSEUDOREF: + if (parse_worktree_ref(refname, NULL, NULL, &refname)) + BUG("not a worktree ref: %s", refname); + break; + default: + break; + } + return !strcmp(refname, "HEAD"); +} + +void reflog_expiry_prepare(const char *refname, + const struct object_id *oid, + void *cb_data) +{ + struct expire_reflog_policy_cb *cb = cb_data; + struct commit_list *elem; + struct commit *commit = NULL; + + if (!cb->cmd.expire_unreachable || is_head(refname)) { + cb->unreachable_expire_kind = UE_HEAD; + } else { + commit = lookup_commit(the_repository, oid); + cb->unreachable_expire_kind = commit ? UE_NORMAL : UE_ALWAYS; + } + + if (cb->cmd.expire_unreachable <= cb->cmd.expire_total) + cb->unreachable_expire_kind = UE_ALWAYS; + + switch (cb->unreachable_expire_kind) { + case UE_ALWAYS: + return; + case UE_HEAD: + for_each_ref(push_tip_to_list, &cb->tips); + for (elem = cb->tips; elem; elem = elem->next) + commit_list_insert(elem->item, &cb->mark_list); + break; + case UE_NORMAL: + commit_list_insert(commit, &cb->mark_list); + /* For reflog_expiry_cleanup() below */ + cb->tip_commit = commit; + } + cb->mark_limit = cb->cmd.expire_total; + mark_reachable(cb); +} + +void reflog_expiry_cleanup(void *cb_data) +{ + struct expire_reflog_policy_cb *cb = cb_data; + struct commit_list *elem; + + switch (cb->unreachable_expire_kind) { + case UE_ALWAYS: + return; + case UE_HEAD: + for (elem = cb->tips; elem; elem = elem->next) + clear_commit_marks(elem->item, REACHABLE); + free_commit_list(cb->tips); + break; + case UE_NORMAL: + clear_commit_marks(cb->tip_commit, REACHABLE); + break; + } +} + +int count_reflog_ent(struct object_id *ooid, struct object_id *noid, + const char *email, timestamp_t timestamp, int tz, + const char *message, void *cb_data) +{ + struct cmd_reflog_expire_cb *cb = cb_data; + if (!cb->expire_total || timestamp < cb->expire_total) + cb->recno++; + return 0; +} + +int reflog_delete(const char *rev, enum expire_reflog_flags flags, int verbose) +{ + struct cmd_reflog_expire_cb cmd = { 0 }; + int status = 0; + reflog_expiry_should_prune_fn *should_prune_fn = should_expire_reflog_ent; + const char *spec = strstr(rev, "@{"); + char *ep, *ref; + int recno; + struct expire_reflog_policy_cb cb = { + .dry_run = !!(flags & EXPIRE_REFLOGS_DRY_RUN), + }; + + if (verbose) + should_prune_fn = should_expire_reflog_ent_verbose; + + if (!spec) + return error(_("not a reflog: %s"), rev); + + if (!dwim_log(rev, spec - rev, NULL, &ref)) { + status |= error(_("no reflog for '%s'"), rev); + goto cleanup; + } + + recno = strtoul(spec + 2, &ep, 10); + if (*ep == '}') { + cmd.recno = -recno; + for_each_reflog_ent(ref, count_reflog_ent, &cmd); + } else { + cmd.expire_total = approxidate(spec + 2); + for_each_reflog_ent(ref, count_reflog_ent, &cmd); + cmd.expire_total = 0; + } + + cb.cmd = cmd; + status |= reflog_expire(ref, flags, + reflog_expiry_prepare, + should_prune_fn, + reflog_expiry_cleanup, + &cb); + + cleanup: + free(ref); + return status; +} diff --git a/reflog.h b/reflog.h new file mode 100644 index 00000000000..d2906fb9f8d --- /dev/null +++ b/reflog.h @@ -0,0 +1,43 @@ +#ifndef REFLOG_H +#define REFLOG_H +#include "refs.h" + +struct cmd_reflog_expire_cb { + int stalefix; + int explicit_expiry; + timestamp_t expire_total; + timestamp_t expire_unreachable; + int recno; +}; + +struct expire_reflog_policy_cb { + enum { + UE_NORMAL, + UE_ALWAYS, + UE_HEAD + } unreachable_expire_kind; + struct commit_list *mark_list; + unsigned long mark_limit; + struct cmd_reflog_expire_cb cmd; + struct commit *tip_commit; + struct commit_list *tips; + unsigned int dry_run:1; +}; + +int reflog_delete(const char *rev, enum expire_reflog_flags flags, + int verbose); +void reflog_expiry_cleanup(void *cb_data); +void reflog_expiry_prepare(const char *refname, const struct object_id *oid, + void *cb_data); +int should_expire_reflog_ent(struct object_id *ooid, struct object_id *noid, + const char *email, timestamp_t timestamp, int tz, + const char *message, void *cb_data); +int count_reflog_ent(struct object_id *ooid, struct object_id *noid, + const char *email, timestamp_t timestamp, int tz, + const char *message, void *cb_data); +int should_expire_reflog_ent_verbose(struct object_id *ooid, + struct object_id *noid, + const char *email, + timestamp_t timestamp, int tz, + const char *message, void *cb_data); +#endif /* REFLOG_H */