From c8bae7493d2f2910b57f13ded012e86bdcfb0532 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 16:47:53 +0200
Subject: Adding upstream version 1:2.39.2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 builtin/reflog.c | 430 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 430 insertions(+)
 create mode 100644 builtin/reflog.c

(limited to 'builtin/reflog.c')

diff --git a/builtin/reflog.c b/builtin/reflog.c
new file mode 100644
index 0000000..270681d
--- /dev/null
+++ b/builtin/reflog.c
@@ -0,0 +1,430 @@
+#include "builtin.h"
+#include "config.h"
+#include "revision.h"
+#include "reachable.h"
+#include "worktree.h"
+#include "reflog.h"
+
+#define BUILTIN_REFLOG_SHOW_USAGE \
+	N_("git reflog [show] [<log-options>] [<ref>]")
+
+#define BUILTIN_REFLOG_EXPIRE_USAGE \
+	N_("git reflog expire [--expire=<time>] [--expire-unreachable=<time>]\n" \
+	   "                  [--rewrite] [--updateref] [--stale-fix]\n" \
+	   "                  [--dry-run | -n] [--verbose] [--all [--single-worktree] | <refs>...]")
+
+#define BUILTIN_REFLOG_DELETE_USAGE \
+	N_("git reflog delete [--rewrite] [--updateref]\n" \
+	   "                  [--dry-run | -n] [--verbose] <ref>@{<specifier>}...")
+
+#define BUILTIN_REFLOG_EXISTS_USAGE \
+	N_("git reflog exists <ref>")
+
+static const char *const reflog_show_usage[] = {
+	BUILTIN_REFLOG_SHOW_USAGE,
+	NULL,
+};
+
+static const char *const reflog_expire_usage[] = {
+	BUILTIN_REFLOG_EXPIRE_USAGE,
+	NULL
+};
+
+static const char *const reflog_delete_usage[] = {
+	BUILTIN_REFLOG_DELETE_USAGE,
+	NULL
+};
+
+static const char *const reflog_exists_usage[] = {
+	BUILTIN_REFLOG_EXISTS_USAGE,
+	NULL,
+};
+
+static const char *const reflog_usage[] = {
+	BUILTIN_REFLOG_SHOW_USAGE,
+	BUILTIN_REFLOG_EXPIRE_USAGE,
+	BUILTIN_REFLOG_DELETE_USAGE,
+	BUILTIN_REFLOG_EXISTS_USAGE,
+	NULL
+};
+
+static timestamp_t default_reflog_expire;
+static timestamp_t default_reflog_expire_unreachable;
+
+struct worktree_reflogs {
+	struct worktree *worktree;
+	struct string_list reflogs;
+};
+
+static int collect_reflog(const char *ref, const struct object_id *oid UNUSED,
+			  int flags UNUSED, void *cb_data)
+{
+	struct worktree_reflogs *cb = cb_data;
+	struct worktree *worktree = cb->worktree;
+	struct strbuf newref = STRBUF_INIT;
+
+	/*
+	 * Avoid collecting the same shared ref multiple times because
+	 * they are available via all worktrees.
+	 */
+	if (!worktree->is_current &&
+	    parse_worktree_ref(ref, NULL, NULL, NULL) == REF_WORKTREE_SHARED)
+		return 0;
+
+	strbuf_worktree_ref(worktree, &newref, ref);
+	string_list_append_nodup(&cb->reflogs, strbuf_detach(&newref, NULL));
+
+	return 0;
+}
+
+static struct reflog_expire_cfg {
+	struct reflog_expire_cfg *next;
+	timestamp_t expire_total;
+	timestamp_t expire_unreachable;
+	char pattern[FLEX_ARRAY];
+} *reflog_expire_cfg, **reflog_expire_cfg_tail;
+
+static struct reflog_expire_cfg *find_cfg_ent(const char *pattern, size_t len)
+{
+	struct reflog_expire_cfg *ent;
+
+	if (!reflog_expire_cfg_tail)
+		reflog_expire_cfg_tail = &reflog_expire_cfg;
+
+	for (ent = reflog_expire_cfg; ent; ent = ent->next)
+		if (!strncmp(ent->pattern, pattern, len) &&
+		    ent->pattern[len] == '\0')
+			return ent;
+
+	FLEX_ALLOC_MEM(ent, pattern, pattern, len);
+	*reflog_expire_cfg_tail = ent;
+	reflog_expire_cfg_tail = &(ent->next);
+	return ent;
+}
+
+/* expiry timer slot */
+#define EXPIRE_TOTAL   01
+#define EXPIRE_UNREACH 02
+
+static int reflog_expire_config(const char *var, const char *value, void *cb)
+{
+	const char *pattern, *key;
+	size_t pattern_len;
+	timestamp_t expire;
+	int slot;
+	struct reflog_expire_cfg *ent;
+
+	if (parse_config_key(var, "gc", &pattern, &pattern_len, &key) < 0)
+		return git_default_config(var, value, cb);
+
+	if (!strcmp(key, "reflogexpire")) {
+		slot = EXPIRE_TOTAL;
+		if (git_config_expiry_date(&expire, var, value))
+			return -1;
+	} else if (!strcmp(key, "reflogexpireunreachable")) {
+		slot = EXPIRE_UNREACH;
+		if (git_config_expiry_date(&expire, var, value))
+			return -1;
+	} else
+		return git_default_config(var, value, cb);
+
+	if (!pattern) {
+		switch (slot) {
+		case EXPIRE_TOTAL:
+			default_reflog_expire = expire;
+			break;
+		case EXPIRE_UNREACH:
+			default_reflog_expire_unreachable = expire;
+			break;
+		}
+		return 0;
+	}
+
+	ent = find_cfg_ent(pattern, pattern_len);
+	if (!ent)
+		return -1;
+	switch (slot) {
+	case EXPIRE_TOTAL:
+		ent->expire_total = expire;
+		break;
+	case EXPIRE_UNREACH:
+		ent->expire_unreachable = expire;
+		break;
+	}
+	return 0;
+}
+
+static void set_reflog_expiry_param(struct cmd_reflog_expire_cb *cb, const char *ref)
+{
+	struct reflog_expire_cfg *ent;
+
+	if (cb->explicit_expiry == (EXPIRE_TOTAL|EXPIRE_UNREACH))
+		return; /* both given explicitly -- nothing to tweak */
+
+	for (ent = reflog_expire_cfg; ent; ent = ent->next) {
+		if (!wildmatch(ent->pattern, ref, 0)) {
+			if (!(cb->explicit_expiry & EXPIRE_TOTAL))
+				cb->expire_total = ent->expire_total;
+			if (!(cb->explicit_expiry & EXPIRE_UNREACH))
+				cb->expire_unreachable = ent->expire_unreachable;
+			return;
+		}
+	}
+
+	/*
+	 * If unconfigured, make stash never expire
+	 */
+	if (!strcmp(ref, "refs/stash")) {
+		if (!(cb->explicit_expiry & EXPIRE_TOTAL))
+			cb->expire_total = 0;
+		if (!(cb->explicit_expiry & EXPIRE_UNREACH))
+			cb->expire_unreachable = 0;
+		return;
+	}
+
+	/* Nothing matched -- use the default value */
+	if (!(cb->explicit_expiry & EXPIRE_TOTAL))
+		cb->expire_total = default_reflog_expire;
+	if (!(cb->explicit_expiry & EXPIRE_UNREACH))
+		cb->expire_unreachable = default_reflog_expire_unreachable;
+}
+
+static int expire_unreachable_callback(const struct option *opt,
+				 const char *arg,
+				 int unset)
+{
+	struct cmd_reflog_expire_cb *cmd = opt->value;
+
+	BUG_ON_OPT_NEG(unset);
+
+	if (parse_expiry_date(arg, &cmd->expire_unreachable))
+		die(_("invalid timestamp '%s' given to '--%s'"),
+		    arg, opt->long_name);
+
+	cmd->explicit_expiry |= EXPIRE_UNREACH;
+	return 0;
+}
+
+static int expire_total_callback(const struct option *opt,
+				 const char *arg,
+				 int unset)
+{
+	struct cmd_reflog_expire_cb *cmd = opt->value;
+
+	BUG_ON_OPT_NEG(unset);
+
+	if (parse_expiry_date(arg, &cmd->expire_total))
+		die(_("invalid timestamp '%s' given to '--%s'"),
+		    arg, opt->long_name);
+
+	cmd->explicit_expiry |= EXPIRE_TOTAL;
+	return 0;
+}
+
+static int cmd_reflog_show(int argc, const char **argv, const char *prefix)
+{
+	struct option options[] = {
+		OPT_END()
+	};
+
+	parse_options(argc, argv, prefix, options, reflog_show_usage,
+		      PARSE_OPT_KEEP_DASHDASH | PARSE_OPT_KEEP_ARGV0 |
+		      PARSE_OPT_KEEP_UNKNOWN_OPT);
+
+	return cmd_log_reflog(argc, argv, prefix);
+}
+
+static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
+{
+	struct cmd_reflog_expire_cb cmd = { 0 };
+	timestamp_t now = time(NULL);
+	int i, status, do_all, all_worktrees = 1;
+	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),
+		OPT_BIT(0, "rewrite", &flags,
+			N_("rewrite the old SHA1 with the new SHA1 of the entry that now precedes it"),
+			EXPIRE_REFLOGS_REWRITE),
+		OPT_BIT(0, "updateref", &flags,
+			N_("update the reference to the value of the top reflog entry"),
+			EXPIRE_REFLOGS_UPDATE_REF),
+		OPT_BOOL(0, "verbose", &verbose, N_("print extra information on screen")),
+		OPT_CALLBACK_F(0, "expire", &cmd, N_("timestamp"),
+			       N_("prune entries older than the specified time"),
+			       PARSE_OPT_NONEG,
+			       expire_total_callback),
+		OPT_CALLBACK_F(0, "expire-unreachable", &cmd, N_("timestamp"),
+			       N_("prune entries older than <time> that are not reachable from the current tip of the branch"),
+			       PARSE_OPT_NONEG,
+			       expire_unreachable_callback),
+		OPT_BOOL(0, "stale-fix", &cmd.stalefix,
+			 N_("prune any reflog entries that point to broken commits")),
+		OPT_BOOL(0, "all", &do_all, N_("process the reflogs of all references")),
+		OPT_BOOL(1, "single-worktree", &all_worktrees,
+			 N_("limits processing to reflogs from the current worktree only")),
+		OPT_END()
+	};
+
+	default_reflog_expire_unreachable = now - 30 * 24 * 3600;
+	default_reflog_expire = now - 90 * 24 * 3600;
+	git_config(reflog_expire_config, NULL);
+
+	save_commit_buffer = 0;
+	do_all = status = 0;
+
+	cmd.explicit_expiry = 0;
+	cmd.expire_total = default_reflog_expire;
+	cmd.expire_unreachable = default_reflog_expire_unreachable;
+
+	argc = parse_options(argc, argv, prefix, options, reflog_expire_usage, 0);
+
+	if (verbose)
+		should_prune_fn = should_expire_reflog_ent_verbose;
+
+	/*
+	 * We can trust the commits and objects reachable from refs
+	 * even in older repository.  We cannot trust what's reachable
+	 * from reflog if the repository was pruned with older git.
+	 */
+	if (cmd.stalefix) {
+		struct rev_info revs;
+
+		repo_init_revisions(the_repository, &revs, prefix);
+		revs.do_not_die_on_missing_tree = 1;
+		revs.ignore_missing = 1;
+		revs.ignore_missing_links = 1;
+		if (verbose)
+			printf(_("Marking reachable objects..."));
+		mark_reachable_objects(&revs, 0, 0, NULL);
+		release_revisions(&revs);
+		if (verbose)
+			putchar('\n');
+	}
+
+	if (do_all) {
+		struct worktree_reflogs collected = {
+			.reflogs = STRING_LIST_INIT_DUP,
+		};
+		struct string_list_item *item;
+		struct worktree **worktrees, **p;
+
+		worktrees = get_worktrees();
+		for (p = worktrees; *p; p++) {
+			if (!all_worktrees && !(*p)->is_current)
+				continue;
+			collected.worktree = *p;
+			refs_for_each_reflog(get_worktree_ref_store(*p),
+					     collect_reflog, &collected);
+		}
+		free_worktrees(worktrees);
+
+		for_each_string_list_item(item, &collected.reflogs) {
+			struct expire_reflog_policy_cb cb = {
+				.cmd = cmd,
+				.dry_run = !!(flags & EXPIRE_REFLOGS_DRY_RUN),
+			};
+
+			set_reflog_expiry_param(&cb.cmd,  item->string);
+			status |= reflog_expire(item->string, flags,
+						reflog_expiry_prepare,
+						should_prune_fn,
+						reflog_expiry_cleanup,
+						&cb);
+		}
+		string_list_clear(&collected.reflogs, 0);
+	}
+
+	for (i = 0; i < argc; i++) {
+		char *ref;
+		struct expire_reflog_policy_cb cb = { .cmd = cmd };
+
+		if (!dwim_log(argv[i], strlen(argv[i]), NULL, &ref)) {
+			status |= error(_("%s points nowhere!"), argv[i]);
+			continue;
+		}
+		set_reflog_expiry_param(&cb.cmd, ref);
+		status |= reflog_expire(ref, flags,
+					reflog_expiry_prepare,
+					should_prune_fn,
+					reflog_expiry_cleanup,
+					&cb);
+		free(ref);
+	}
+	return status;
+}
+
+static int cmd_reflog_delete(int argc, const char **argv, const char *prefix)
+{
+	int i, status = 0;
+	unsigned int flags = 0;
+	int verbose = 0;
+
+	const struct option options[] = {
+		OPT_BIT(0, "dry-run", &flags, N_("do not actually prune any entries"),
+			EXPIRE_REFLOGS_DRY_RUN),
+		OPT_BIT(0, "rewrite", &flags,
+			N_("rewrite the old SHA1 with the new SHA1 of the entry that now precedes it"),
+			EXPIRE_REFLOGS_REWRITE),
+		OPT_BIT(0, "updateref", &flags,
+			N_("update the reference to the value of the top reflog entry"),
+			EXPIRE_REFLOGS_UPDATE_REF),
+		OPT_BOOL(0, "verbose", &verbose, N_("print extra information on screen")),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options, reflog_delete_usage, 0);
+
+	if (argc < 1)
+		return error(_("no reflog specified to delete"));
+
+	for (i = 0; i < argc; i++)
+		status |= reflog_delete(argv[i], flags, verbose);
+
+	return status;
+}
+
+static int cmd_reflog_exists(int argc, const char **argv, const char *prefix)
+{
+	struct option options[] = {
+		OPT_END()
+	};
+	const char *refname;
+
+	argc = parse_options(argc, argv, prefix, options, reflog_exists_usage,
+			     0);
+	if (!argc)
+		usage_with_options(reflog_exists_usage, options);
+
+	refname = argv[0];
+	if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
+		die(_("invalid ref format: %s"), refname);
+	return !reflog_exists(refname);
+}
+
+/*
+ * main "reflog"
+ */
+
+int cmd_reflog(int argc, const char **argv, const char *prefix)
+{
+	parse_opt_subcommand_fn *fn = NULL;
+	struct option options[] = {
+		OPT_SUBCOMMAND("show", &fn, cmd_reflog_show),
+		OPT_SUBCOMMAND("expire", &fn, cmd_reflog_expire),
+		OPT_SUBCOMMAND("delete", &fn, cmd_reflog_delete),
+		OPT_SUBCOMMAND("exists", &fn, cmd_reflog_exists),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options, reflog_usage,
+			     PARSE_OPT_SUBCOMMAND_OPTIONAL |
+			     PARSE_OPT_KEEP_DASHDASH | PARSE_OPT_KEEP_ARGV0 |
+			     PARSE_OPT_KEEP_UNKNOWN_OPT);
+	if (fn)
+		return fn(argc - 1, argv + 1, prefix);
+	else
+		return cmd_log_reflog(argc, argv, prefix);
+}
-- 
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