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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-09 13:34:27 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-09 13:34:27 +0000
commit4dbdc42d9e7c3968ff7f690d00680419c9b8cb0f (patch)
tree47c1d492e9c956c1cd2b74dbd3b9d8b0db44dc4e /refs.c
parentInitial commit. (diff)
downloadgit-4dbdc42d9e7c3968ff7f690d00680419c9b8cb0f.tar.xz
git-4dbdc42d9e7c3968ff7f690d00680419c9b8cb0f.zip
Adding upstream version 1:2.43.0.upstream/1%2.43.0
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'refs.c')
-rw-r--r--refs.c2649
1 files changed, 2649 insertions, 0 deletions
diff --git a/refs.c b/refs.c
new file mode 100644
index 0000000..fcae5dd
--- /dev/null
+++ b/refs.c
@@ -0,0 +1,2649 @@
+/*
+ * The backend-independent part of the reference module.
+ */
+
+#include "git-compat-util.h"
+#include "advice.h"
+#include "config.h"
+#include "environment.h"
+#include "hashmap.h"
+#include "gettext.h"
+#include "hex.h"
+#include "lockfile.h"
+#include "iterator.h"
+#include "refs.h"
+#include "refs/refs-internal.h"
+#include "run-command.h"
+#include "hook.h"
+#include "object-name.h"
+#include "object-store-ll.h"
+#include "object.h"
+#include "path.h"
+#include "tag.h"
+#include "submodule.h"
+#include "worktree.h"
+#include "strvec.h"
+#include "repository.h"
+#include "setup.h"
+#include "sigchain.h"
+#include "date.h"
+#include "commit.h"
+#include "wildmatch.h"
+
+/*
+ * List of all available backends
+ */
+static struct ref_storage_be *refs_backends = &refs_be_files;
+
+static struct ref_storage_be *find_ref_storage_backend(const char *name)
+{
+ struct ref_storage_be *be;
+ for (be = refs_backends; be; be = be->next)
+ if (!strcmp(be->name, name))
+ return be;
+ return NULL;
+}
+
+/*
+ * How to handle various characters in refnames:
+ * 0: An acceptable character for refs
+ * 1: End-of-component
+ * 2: ., look for a preceding . to reject .. in refs
+ * 3: {, look for a preceding @ to reject @{ in refs
+ * 4: A bad character: ASCII control characters, and
+ * ":", "?", "[", "\", "^", "~", SP, or TAB
+ * 5: *, reject unless REFNAME_REFSPEC_PATTERN is set
+ */
+static unsigned char refname_disposition[256] = {
+ 1, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 2, 1,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 4,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 4, 0, 4, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 4, 4
+};
+
+struct ref_namespace_info ref_namespace[] = {
+ [NAMESPACE_HEAD] = {
+ .ref = "HEAD",
+ .decoration = DECORATION_REF_HEAD,
+ .exact = 1,
+ },
+ [NAMESPACE_BRANCHES] = {
+ .ref = "refs/heads/",
+ .decoration = DECORATION_REF_LOCAL,
+ },
+ [NAMESPACE_TAGS] = {
+ .ref = "refs/tags/",
+ .decoration = DECORATION_REF_TAG,
+ },
+ [NAMESPACE_REMOTE_REFS] = {
+ /*
+ * The default refspec for new remotes copies refs from
+ * refs/heads/ on the remote into refs/remotes/<remote>/.
+ * As such, "refs/remotes/" has special handling.
+ */
+ .ref = "refs/remotes/",
+ .decoration = DECORATION_REF_REMOTE,
+ },
+ [NAMESPACE_STASH] = {
+ /*
+ * The single ref "refs/stash" stores the latest stash.
+ * Older stashes can be found in the reflog.
+ */
+ .ref = "refs/stash",
+ .exact = 1,
+ .decoration = DECORATION_REF_STASH,
+ },
+ [NAMESPACE_REPLACE] = {
+ /*
+ * This namespace allows Git to act as if one object ID
+ * points to the content of another. Unlike the other
+ * ref namespaces, this one can be changed by the
+ * GIT_REPLACE_REF_BASE environment variable. This
+ * .namespace value will be overwritten in setup_git_env().
+ */
+ .ref = "refs/replace/",
+ .decoration = DECORATION_GRAFTED,
+ },
+ [NAMESPACE_NOTES] = {
+ /*
+ * The refs/notes/commit ref points to the tip of a
+ * parallel commit history that adds metadata to commits
+ * in the normal history. This ref can be overwritten
+ * by the core.notesRef config variable or the
+ * GIT_NOTES_REFS environment variable.
+ */
+ .ref = "refs/notes/commit",
+ .exact = 1,
+ },
+ [NAMESPACE_PREFETCH] = {
+ /*
+ * Prefetch refs are written by the background 'fetch'
+ * maintenance task. It allows faster foreground fetches
+ * by advertising these previously-downloaded tips without
+ * updating refs/remotes/ without user intervention.
+ */
+ .ref = "refs/prefetch/",
+ },
+ [NAMESPACE_REWRITTEN] = {
+ /*
+ * Rewritten refs are used by the 'label' command in the
+ * sequencer. These are particularly useful during an
+ * interactive rebase that uses the 'merge' command.
+ */
+ .ref = "refs/rewritten/",
+ },
+};
+
+void update_ref_namespace(enum ref_namespace namespace, char *ref)
+{
+ struct ref_namespace_info *info = &ref_namespace[namespace];
+ if (info->ref_updated)
+ free(info->ref);
+ info->ref = ref;
+ info->ref_updated = 1;
+}
+
+/*
+ * Try to read one refname component from the front of refname.
+ * Return the length of the component found, or -1 if the component is
+ * not legal. It is legal if it is something reasonable to have under
+ * ".git/refs/"; We do not like it if:
+ *
+ * - it begins with ".", or
+ * - it has double dots "..", or
+ * - it has ASCII control characters, or
+ * - it has ":", "?", "[", "\", "^", "~", SP, or TAB anywhere, or
+ * - it has "*" anywhere unless REFNAME_REFSPEC_PATTERN is set, or
+ * - it ends with a "/", or
+ * - it ends with ".lock", or
+ * - it contains a "@{" portion
+ *
+ * When sanitized is not NULL, instead of rejecting the input refname
+ * as an error, try to come up with a usable replacement for the input
+ * refname in it.
+ */
+static int check_refname_component(const char *refname, int *flags,
+ struct strbuf *sanitized)
+{
+ const char *cp;
+ char last = '\0';
+ size_t component_start = 0; /* garbage - not a reasonable initial value */
+
+ if (sanitized)
+ component_start = sanitized->len;
+
+ for (cp = refname; ; cp++) {
+ int ch = *cp & 255;
+ unsigned char disp = refname_disposition[ch];
+
+ if (sanitized && disp != 1)
+ strbuf_addch(sanitized, ch);
+
+ switch (disp) {
+ case 1:
+ goto out;
+ case 2:
+ if (last == '.') { /* Refname contains "..". */
+ if (sanitized)
+ /* collapse ".." to single "." */
+ strbuf_setlen(sanitized, sanitized->len - 1);
+ else
+ return -1;
+ }
+ break;
+ case 3:
+ if (last == '@') { /* Refname contains "@{". */
+ if (sanitized)
+ sanitized->buf[sanitized->len-1] = '-';
+ else
+ return -1;
+ }
+ break;
+ case 4:
+ /* forbidden char */
+ if (sanitized)
+ sanitized->buf[sanitized->len-1] = '-';
+ else
+ return -1;
+ break;
+ case 5:
+ if (!(*flags & REFNAME_REFSPEC_PATTERN)) {
+ /* refspec can't be a pattern */
+ if (sanitized)
+ sanitized->buf[sanitized->len-1] = '-';
+ else
+ return -1;
+ }
+
+ /*
+ * Unset the pattern flag so that we only accept
+ * a single asterisk for one side of refspec.
+ */
+ *flags &= ~ REFNAME_REFSPEC_PATTERN;
+ break;
+ }
+ last = ch;
+ }
+out:
+ if (cp == refname)
+ return 0; /* Component has zero length. */
+
+ if (refname[0] == '.') { /* Component starts with '.'. */
+ if (sanitized)
+ sanitized->buf[component_start] = '-';
+ else
+ return -1;
+ }
+ if (cp - refname >= LOCK_SUFFIX_LEN &&
+ !memcmp(cp - LOCK_SUFFIX_LEN, LOCK_SUFFIX, LOCK_SUFFIX_LEN)) {
+ if (!sanitized)
+ return -1;
+ /* Refname ends with ".lock". */
+ while (strbuf_strip_suffix(sanitized, LOCK_SUFFIX)) {
+ /* try again in case we have .lock.lock */
+ }
+ }
+ return cp - refname;
+}
+
+static int check_or_sanitize_refname(const char *refname, int flags,
+ struct strbuf *sanitized)
+{
+ int component_len, component_count = 0;
+
+ if (!strcmp(refname, "@")) {
+ /* Refname is a single character '@'. */
+ if (sanitized)
+ strbuf_addch(sanitized, '-');
+ else
+ return -1;
+ }
+
+ while (1) {
+ if (sanitized && sanitized->len)
+ strbuf_complete(sanitized, '/');
+
+ /* We are at the start of a path component. */
+ component_len = check_refname_component(refname, &flags,
+ sanitized);
+ if (sanitized && component_len == 0)
+ ; /* OK, omit empty component */
+ else if (component_len <= 0)
+ return -1;
+
+ component_count++;
+ if (refname[component_len] == '\0')
+ break;
+ /* Skip to next component. */
+ refname += component_len + 1;
+ }
+
+ if (refname[component_len - 1] == '.') {
+ /* Refname ends with '.'. */
+ if (sanitized)
+ ; /* omit ending dot */
+ else
+ return -1;
+ }
+ if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2)
+ return -1; /* Refname has only one component. */
+ return 0;
+}
+
+int check_refname_format(const char *refname, int flags)
+{
+ return check_or_sanitize_refname(refname, flags, NULL);
+}
+
+void sanitize_refname_component(const char *refname, struct strbuf *out)
+{
+ if (check_or_sanitize_refname(refname, REFNAME_ALLOW_ONELEVEL, out))
+ BUG("sanitizing refname '%s' check returned error", refname);
+}
+
+int refname_is_safe(const char *refname)
+{
+ const char *rest;
+
+ if (skip_prefix(refname, "refs/", &rest)) {
+ char *buf;
+ int result;
+ size_t restlen = strlen(rest);
+
+ /* rest must not be empty, or start or end with "/" */
+ if (!restlen || *rest == '/' || rest[restlen - 1] == '/')
+ return 0;
+
+ /*
+ * Does the refname try to escape refs/?
+ * For example: refs/foo/../bar is safe but refs/foo/../../bar
+ * is not.
+ */
+ buf = xmallocz(restlen);
+ result = !normalize_path_copy(buf, rest) && !strcmp(buf, rest);
+ free(buf);
+ return result;
+ }
+
+ do {
+ if (!isupper(*refname) && *refname != '_')
+ return 0;
+ refname++;
+ } while (*refname);
+ return 1;
+}
+
+/*
+ * Return true if refname, which has the specified oid and flags, can
+ * be resolved to an object in the database. If the referred-to object
+ * does not exist, emit a warning and return false.
+ */
+int ref_resolves_to_object(const char *refname,
+ struct repository *repo,
+ const struct object_id *oid,
+ unsigned int flags)
+{
+ if (flags & REF_ISBROKEN)
+ return 0;
+ if (!repo_has_object_file(repo, oid)) {
+ error(_("%s does not point to a valid object!"), refname);
+ return 0;
+ }
+ return 1;
+}
+
+char *refs_resolve_refdup(struct ref_store *refs,
+ const char *refname, int resolve_flags,
+ struct object_id *oid, int *flags)
+{
+ const char *result;
+
+ result = refs_resolve_ref_unsafe(refs, refname, resolve_flags,
+ oid, flags);
+ return xstrdup_or_null(result);
+}
+
+char *resolve_refdup(const char *refname, int resolve_flags,
+ struct object_id *oid, int *flags)
+{
+ return refs_resolve_refdup(get_main_ref_store(the_repository),
+ refname, resolve_flags,
+ oid, flags);
+}
+
+/* The argument to for_each_filter_refs */
+struct for_each_ref_filter {
+ const char *pattern;
+ const char *prefix;
+ each_ref_fn *fn;
+ void *cb_data;
+};
+
+int read_ref_full(const char *refname, int resolve_flags, struct object_id *oid, int *flags)
+{
+ struct ref_store *refs = get_main_ref_store(the_repository);
+
+ if (refs_resolve_ref_unsafe(refs, refname, resolve_flags,
+ oid, flags))
+ return 0;
+ return -1;
+}
+
+int read_ref(const char *refname, struct object_id *oid)
+{
+ return read_ref_full(refname, RESOLVE_REF_READING, oid, NULL);
+}
+
+int refs_ref_exists(struct ref_store *refs, const char *refname)
+{
+ return !!refs_resolve_ref_unsafe(refs, refname, RESOLVE_REF_READING,
+ NULL, NULL);
+}
+
+int ref_exists(const char *refname)
+{
+ return refs_ref_exists(get_main_ref_store(the_repository), refname);
+}
+
+static int for_each_filter_refs(const char *refname,
+ const struct object_id *oid,
+ int flags, void *data)
+{
+ struct for_each_ref_filter *filter = data;
+
+ if (wildmatch(filter->pattern, refname, 0))
+ return 0;
+ if (filter->prefix)
+ skip_prefix(refname, filter->prefix, &refname);
+ return filter->fn(refname, oid, flags, filter->cb_data);
+}
+
+enum peel_status peel_object(const struct object_id *name, struct object_id *oid)
+{
+ struct object *o = lookup_unknown_object(the_repository, name);
+
+ if (o->type == OBJ_NONE) {
+ int type = oid_object_info(the_repository, name, NULL);
+ if (type < 0 || !object_as_type(o, type, 0))
+ return PEEL_INVALID;
+ }
+
+ if (o->type != OBJ_TAG)
+ return PEEL_NON_TAG;
+
+ o = deref_tag_noverify(o);
+ if (!o)
+ return PEEL_INVALID;
+
+ oidcpy(oid, &o->oid);
+ return PEEL_PEELED;
+}
+
+struct warn_if_dangling_data {
+ FILE *fp;
+ const char *refname;
+ const struct string_list *refnames;
+ const char *msg_fmt;
+};
+
+static int warn_if_dangling_symref(const char *refname,
+ const struct object_id *oid UNUSED,
+ int flags, void *cb_data)
+{
+ struct warn_if_dangling_data *d = cb_data;
+ const char *resolves_to;
+
+ if (!(flags & REF_ISSYMREF))
+ return 0;
+
+ resolves_to = resolve_ref_unsafe(refname, 0, NULL, NULL);
+ if (!resolves_to
+ || (d->refname
+ ? strcmp(resolves_to, d->refname)
+ : !string_list_has_string(d->refnames, resolves_to))) {
+ return 0;
+ }
+
+ fprintf(d->fp, d->msg_fmt, refname);
+ fputc('\n', d->fp);
+ return 0;
+}
+
+void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
+{
+ struct warn_if_dangling_data data;
+
+ data.fp = fp;
+ data.refname = refname;
+ data.refnames = NULL;
+ data.msg_fmt = msg_fmt;
+ for_each_rawref(warn_if_dangling_symref, &data);
+}
+
+void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_list *refnames)
+{
+ struct warn_if_dangling_data data;
+
+ data.fp = fp;
+ data.refname = NULL;
+ data.refnames = refnames;
+ data.msg_fmt = msg_fmt;
+ for_each_rawref(warn_if_dangling_symref, &data);
+}
+
+int refs_for_each_tag_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
+{
+ return refs_for_each_ref_in(refs, "refs/tags/", fn, cb_data);
+}
+
+int for_each_tag_ref(each_ref_fn fn, void *cb_data)
+{
+ return refs_for_each_tag_ref(get_main_ref_store(the_repository), fn, cb_data);
+}
+
+int refs_for_each_branch_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
+{
+ return refs_for_each_ref_in(refs, "refs/heads/", fn, cb_data);
+}
+
+int for_each_branch_ref(each_ref_fn fn, void *cb_data)
+{
+ return refs_for_each_branch_ref(get_main_ref_store(the_repository), fn, cb_data);
+}
+
+int refs_for_each_remote_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
+{
+ return refs_for_each_ref_in(refs, "refs/remotes/", fn, cb_data);
+}
+
+int for_each_remote_ref(each_ref_fn fn, void *cb_data)
+{
+ return refs_for_each_remote_ref(get_main_ref_store(the_repository), fn, cb_data);
+}
+
+int head_ref_namespaced(each_ref_fn fn, void *cb_data)
+{
+ struct strbuf buf = STRBUF_INIT;
+ int ret = 0;
+ struct object_id oid;
+ int flag;
+
+ strbuf_addf(&buf, "%sHEAD", get_git_namespace());
+ if (!read_ref_full(buf.buf, RESOLVE_REF_READING, &oid, &flag))
+ ret = fn(buf.buf, &oid, flag, cb_data);
+ strbuf_release(&buf);
+
+ return ret;
+}
+
+void normalize_glob_ref(struct string_list_item *item, const char *prefix,
+ const char *pattern)
+{
+ struct strbuf normalized_pattern = STRBUF_INIT;
+
+ if (*pattern == '/')
+ BUG("pattern must not start with '/'");
+
+ if (prefix)
+ strbuf_addstr(&normalized_pattern, prefix);
+ else if (!starts_with(pattern, "refs/") &&
+ strcmp(pattern, "HEAD"))
+ strbuf_addstr(&normalized_pattern, "refs/");
+ /*
+ * NEEDSWORK: Special case other symrefs such as REBASE_HEAD,
+ * MERGE_HEAD, etc.
+ */
+
+ strbuf_addstr(&normalized_pattern, pattern);
+ strbuf_strip_suffix(&normalized_pattern, "/");
+
+ item->string = strbuf_detach(&normalized_pattern, NULL);
+ item->util = has_glob_specials(pattern) ? NULL : item->string;
+ strbuf_release(&normalized_pattern);
+}
+
+int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
+ const char *prefix, void *cb_data)
+{
+ struct strbuf real_pattern = STRBUF_INIT;
+ struct for_each_ref_filter filter;
+ int ret;
+
+ if (!prefix && !starts_with(pattern, "refs/"))
+ strbuf_addstr(&real_pattern, "refs/");
+ else if (prefix)
+ strbuf_addstr(&real_pattern, prefix);
+ strbuf_addstr(&real_pattern, pattern);
+
+ if (!has_glob_specials(pattern)) {
+ /* Append implied '/' '*' if not present. */
+ strbuf_complete(&real_pattern, '/');
+ /* No need to check for '*', there is none. */
+ strbuf_addch(&real_pattern, '*');
+ }
+
+ filter.pattern = real_pattern.buf;
+ filter.prefix = prefix;
+ filter.fn = fn;
+ filter.cb_data = cb_data;
+ ret = for_each_ref(for_each_filter_refs, &filter);
+
+ strbuf_release(&real_pattern);
+ return ret;
+}
+
+int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data)
+{
+ return for_each_glob_ref_in(fn, pattern, NULL, cb_data);
+}
+
+const char *prettify_refname(const char *name)
+{
+ if (skip_prefix(name, "refs/heads/", &name) ||
+ skip_prefix(name, "refs/tags/", &name) ||
+ skip_prefix(name, "refs/remotes/", &name))
+ ; /* nothing */
+ return name;
+}
+
+static const char *ref_rev_parse_rules[] = {
+ "%.*s",
+ "refs/%.*s",
+ "refs/tags/%.*s",
+ "refs/heads/%.*s",
+ "refs/remotes/%.*s",
+ "refs/remotes/%.*s/HEAD",
+ NULL
+};
+
+#define NUM_REV_PARSE_RULES (ARRAY_SIZE(ref_rev_parse_rules) - 1)
+
+/*
+ * Is it possible that the caller meant full_name with abbrev_name?
+ * If so return a non-zero value to signal "yes"; the magnitude of
+ * the returned value gives the precedence used for disambiguation.
+ *
+ * If abbrev_name cannot mean full_name, return 0.
+ */
+int refname_match(const char *abbrev_name, const char *full_name)
+{
+ const char **p;
+ const int abbrev_name_len = strlen(abbrev_name);
+ const int num_rules = NUM_REV_PARSE_RULES;
+
+ for (p = ref_rev_parse_rules; *p; p++)
+ if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name)))
+ return &ref_rev_parse_rules[num_rules] - p;
+
+ return 0;
+}
+
+/*
+ * Given a 'prefix' expand it by the rules in 'ref_rev_parse_rules' and add
+ * the results to 'prefixes'
+ */
+void expand_ref_prefix(struct strvec *prefixes, const char *prefix)
+{
+ const char **p;
+ int len = strlen(prefix);
+
+ for (p = ref_rev_parse_rules; *p; p++)
+ strvec_pushf(prefixes, *p, len, prefix);
+}
+
+static const char default_branch_name_advice[] = N_(
+"Using '%s' as the name for the initial branch. This default branch name\n"
+"is subject to change. To configure the initial branch name to use in all\n"
+"of your new repositories, which will suppress this warning, call:\n"
+"\n"
+"\tgit config --global init.defaultBranch <name>\n"
+"\n"
+"Names commonly chosen instead of 'master' are 'main', 'trunk' and\n"
+"'development'. The just-created branch can be renamed via this command:\n"
+"\n"
+"\tgit branch -m <name>\n"
+);
+
+char *repo_default_branch_name(struct repository *r, int quiet)
+{
+ const char *config_key = "init.defaultbranch";
+ const char *config_display_key = "init.defaultBranch";
+ char *ret = NULL, *full_ref;
+ const char *env = getenv("GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME");
+
+ if (env && *env)
+ ret = xstrdup(env);
+ else if (repo_config_get_string(r, config_key, &ret) < 0)
+ die(_("could not retrieve `%s`"), config_display_key);
+
+ if (!ret) {
+ ret = xstrdup("master");
+ if (!quiet)
+ advise(_(default_branch_name_advice), ret);
+ }
+
+ full_ref = xstrfmt("refs/heads/%s", ret);
+ if (check_refname_format(full_ref, 0))
+ die(_("invalid branch name: %s = %s"), config_display_key, ret);
+ free(full_ref);
+
+ return ret;
+}
+
+const char *git_default_branch_name(int quiet)
+{
+ static char *ret;
+
+ if (!ret)
+ ret = repo_default_branch_name(the_repository, quiet);
+
+ return ret;
+}
+
+/*
+ * *string and *len will only be substituted, and *string returned (for
+ * later free()ing) if the string passed in is a magic short-hand form
+ * to name a branch.
+ */
+static char *substitute_branch_name(struct repository *r,
+ const char **string, int *len,
+ int nonfatal_dangling_mark)
+{
+ struct strbuf buf = STRBUF_INIT;
+ struct interpret_branch_name_options options = {
+ .nonfatal_dangling_mark = nonfatal_dangling_mark
+ };
+ int ret = repo_interpret_branch_name(r, *string, *len, &buf, &options);
+
+ if (ret == *len) {
+ size_t size;
+ *string = strbuf_detach(&buf, &size);
+ *len = size;
+ return (char *)*string;
+ }
+
+ return NULL;
+}
+
+int repo_dwim_ref(struct repository *r, const char *str, int len,
+ struct object_id *oid, char **ref, int nonfatal_dangling_mark)
+{
+ char *last_branch = substitute_branch_name(r, &str, &len,
+ nonfatal_dangling_mark);
+ int refs_found = expand_ref(r, str, len, oid, ref);
+ free(last_branch);
+ return refs_found;
+}
+
+int expand_ref(struct repository *repo, const char *str, int len,
+ struct object_id *oid, char **ref)
+{
+ const char **p, *r;
+ int refs_found = 0;
+ struct strbuf fullref = STRBUF_INIT;
+
+ *ref = NULL;
+ for (p = ref_rev_parse_rules; *p; p++) {
+ struct object_id oid_from_ref;
+ struct object_id *this_result;
+ int flag;
+ struct ref_store *refs = get_main_ref_store(repo);
+
+ this_result = refs_found ? &oid_from_ref : oid;
+ strbuf_reset(&fullref);
+ strbuf_addf(&fullref, *p, len, str);
+ r = refs_resolve_ref_unsafe(refs, fullref.buf,
+ RESOLVE_REF_READING,
+ this_result, &flag);
+ if (r) {
+ if (!refs_found++)
+ *ref = xstrdup(r);
+ if (!warn_ambiguous_refs)
+ break;
+ } else if ((flag & REF_ISSYMREF) && strcmp(fullref.buf, "HEAD")) {
+ warning(_("ignoring dangling symref %s"), fullref.buf);
+ } else if ((flag & REF_ISBROKEN) && strchr(fullref.buf, '/')) {
+ warning(_("ignoring broken ref %s"), fullref.buf);
+ }
+ }
+ strbuf_release(&fullref);
+ return refs_found;
+}
+
+int repo_dwim_log(struct repository *r, const char *str, int len,
+ struct object_id *oid, char **log)
+{
+ struct ref_store *refs = get_main_ref_store(r);
+ char *last_branch = substitute_branch_name(r, &str, &len, 0);
+ const char **p;
+ int logs_found = 0;
+ struct strbuf path = STRBUF_INIT;
+
+ *log = NULL;
+ for (p = ref_rev_parse_rules; *p; p++) {
+ struct object_id hash;
+ const char *ref, *it;
+
+ strbuf_reset(&path);
+ strbuf_addf(&path, *p, len, str);
+ ref = refs_resolve_ref_unsafe(refs, path.buf,
+ RESOLVE_REF_READING,
+ oid ? &hash : NULL, NULL);
+ if (!ref)
+ continue;
+ if (refs_reflog_exists(refs, path.buf))
+ it = path.buf;
+ else if (strcmp(ref, path.buf) &&
+ refs_reflog_exists(refs, ref))
+ it = ref;
+ else
+ continue;
+ if (!logs_found++) {
+ *log = xstrdup(it);
+ if (oid)
+ oidcpy(oid, &hash);
+ }
+ if (!warn_ambiguous_refs)
+ break;
+ }
+ strbuf_release(&path);
+ free(last_branch);
+ return logs_found;
+}
+
+int dwim_log(const char *str, int len, struct object_id *oid, char **log)
+{
+ return repo_dwim_log(the_repository, str, len, oid, log);
+}
+
+int is_per_worktree_ref(const char *refname)
+{
+ return starts_with(refname, "refs/worktree/") ||
+ starts_with(refname, "refs/bisect/") ||
+ starts_with(refname, "refs/rewritten/");
+}
+
+static int is_pseudoref_syntax(const char *refname)
+{
+ const char *c;
+
+ for (c = refname; *c; c++) {
+ if (!isupper(*c) && *c != '-' && *c != '_')
+ return 0;
+ }
+
+ /*
+ * HEAD is not a pseudoref, but it certainly uses the
+ * pseudoref syntax.
+ */
+ return 1;
+}
+
+static int is_current_worktree_ref(const char *ref) {
+ return is_pseudoref_syntax(ref) || is_per_worktree_ref(ref);
+}
+
+enum ref_worktree_type parse_worktree_ref(const char *maybe_worktree_ref,
+ const char **worktree_name, int *worktree_name_length,
+ const char **bare_refname)
+{
+ const char *name_dummy;
+ int name_length_dummy;
+ const char *ref_dummy;
+
+ if (!worktree_name)
+ worktree_name = &name_dummy;
+ if (!worktree_name_length)
+ worktree_name_length = &name_length_dummy;
+ if (!bare_refname)
+ bare_refname = &ref_dummy;
+
+ if (skip_prefix(maybe_worktree_ref, "worktrees/", bare_refname)) {
+ const char *slash = strchr(*bare_refname, '/');
+
+ *worktree_name = *bare_refname;
+ if (!slash) {
+ *worktree_name_length = strlen(*worktree_name);
+
+ /* This is an error condition, and the caller tell because the bare_refname is "" */
+ *bare_refname = *worktree_name + *worktree_name_length;
+ return REF_WORKTREE_OTHER;
+ }
+
+ *worktree_name_length = slash - *bare_refname;
+ *bare_refname = slash + 1;
+
+ if (is_current_worktree_ref(*bare_refname))
+ return REF_WORKTREE_OTHER;
+ }
+
+ *worktree_name = NULL;
+ *worktree_name_length = 0;
+
+ if (skip_prefix(maybe_worktree_ref, "main-worktree/", bare_refname)
+ && is_current_worktree_ref(*bare_refname))
+ return REF_WORKTREE_MAIN;
+
+ *bare_refname = maybe_worktree_ref;
+ if (is_current_worktree_ref(maybe_worktree_ref))
+ return REF_WORKTREE_CURRENT;
+
+ return REF_WORKTREE_SHARED;
+}
+
+long get_files_ref_lock_timeout_ms(void)
+{
+ static int configured = 0;
+
+ /* The default timeout is 100 ms: */
+ static int timeout_ms = 100;
+
+ if (!configured) {
+ git_config_get_int("core.filesreflocktimeout", &timeout_ms);
+ configured = 1;
+ }
+
+ return timeout_ms;
+}
+
+int refs_delete_ref(struct ref_store *refs, const char *msg,
+ const char *refname,
+ const struct object_id *old_oid,
+ unsigned int flags)
+{
+ struct ref_transaction *transaction;
+ struct strbuf err = STRBUF_INIT;
+
+ transaction = ref_store_transaction_begin(refs, &err);
+ if (!transaction ||
+ ref_transaction_delete(transaction, refname, old_oid,
+ flags, msg, &err) ||
+ ref_transaction_commit(transaction, &err)) {
+ error("%s", err.buf);
+ ref_transaction_free(transaction);
+ strbuf_release(&err);
+ return 1;
+ }
+ ref_transaction_free(transaction);
+ strbuf_release(&err);
+ return 0;
+}
+
+int delete_ref(const char *msg, const char *refname,
+ const struct object_id *old_oid, unsigned int flags)
+{
+ return refs_delete_ref(get_main_ref_store(the_repository), msg, refname,
+ old_oid, flags);
+}
+
+static void copy_reflog_msg(struct strbuf *sb, const char *msg)
+{
+ char c;
+ int wasspace = 1;
+
+ while ((c = *msg++)) {
+ if (wasspace && isspace(c))
+ continue;
+ wasspace = isspace(c);
+ if (wasspace)
+ c = ' ';
+ strbuf_addch(sb, c);
+ }
+ strbuf_rtrim(sb);
+}
+
+static char *normalize_reflog_message(const char *msg)
+{
+ struct strbuf sb = STRBUF_INIT;
+
+ if (msg && *msg)
+ copy_reflog_msg(&sb, msg);
+ return strbuf_detach(&sb, NULL);
+}
+
+int should_autocreate_reflog(const char *refname)
+{
+ switch (log_all_ref_updates) {
+ case LOG_REFS_ALWAYS:
+ return 1;
+ case LOG_REFS_NORMAL:
+ return starts_with(refname, "refs/heads/") ||
+ starts_with(refname, "refs/remotes/") ||
+ starts_with(refname, "refs/notes/") ||
+ !strcmp(refname, "HEAD");
+ default:
+ return 0;
+ }
+}
+
+int is_branch(const char *refname)
+{
+ return !strcmp(refname, "HEAD") || starts_with(refname, "refs/heads/");
+}
+
+struct read_ref_at_cb {
+ const char *refname;
+ timestamp_t at_time;
+ int cnt;
+ int reccnt;
+ struct object_id *oid;
+ int found_it;
+
+ struct object_id ooid;
+ struct object_id noid;
+ int tz;
+ timestamp_t date;
+ char **msg;
+ timestamp_t *cutoff_time;
+ int *cutoff_tz;
+ int *cutoff_cnt;
+};
+
+static void set_read_ref_cutoffs(struct read_ref_at_cb *cb,
+ timestamp_t timestamp, int tz, const char *message)
+{
+ if (cb->msg)
+ *cb->msg = xstrdup(message);
+ if (cb->cutoff_time)
+ *cb->cutoff_time = timestamp;
+ if (cb->cutoff_tz)
+ *cb->cutoff_tz = tz;
+ if (cb->cutoff_cnt)
+ *cb->cutoff_cnt = cb->reccnt;
+}
+
+static int read_ref_at_ent(struct object_id *ooid, struct object_id *noid,
+ const char *email UNUSED,
+ timestamp_t timestamp, int tz,
+ const char *message, void *cb_data)
+{
+ struct read_ref_at_cb *cb = cb_data;
+ int reached_count;
+
+ cb->tz = tz;
+ cb->date = timestamp;
+
+ /*
+ * It is not possible for cb->cnt == 0 on the first iteration because
+ * that special case is handled in read_ref_at().
+ */
+ if (cb->cnt > 0)
+ cb->cnt--;
+ reached_count = cb->cnt == 0 && !is_null_oid(ooid);
+ if (timestamp <= cb->at_time || reached_count) {
+ set_read_ref_cutoffs(cb, timestamp, tz, message);
+ /*
+ * we have not yet updated cb->[n|o]oid so they still
+ * hold the values for the previous record.
+ */
+ if (!is_null_oid(&cb->ooid) && !oideq(&cb->ooid, noid))
+ warning(_("log for ref %s has gap after %s"),
+ cb->refname, show_date(cb->date, cb->tz, DATE_MODE(RFC2822)));
+ if (reached_count)
+ oidcpy(cb->oid, ooid);
+ else if (!is_null_oid(&cb->ooid) || cb->date == cb->at_time)
+ oidcpy(cb->oid, noid);
+ else if (!oideq(noid, cb->oid))
+ warning(_("log for ref %s unexpectedly ended on %s"),
+ cb->refname, show_date(cb->date, cb->tz,
+ DATE_MODE(RFC2822)));
+ cb->found_it = 1;
+ }
+ cb->reccnt++;
+ oidcpy(&cb->ooid, ooid);
+ oidcpy(&cb->noid, noid);
+ return cb->found_it;
+}
+
+static int read_ref_at_ent_newest(struct object_id *ooid UNUSED,
+ struct object_id *noid,
+ const char *email UNUSED,
+ timestamp_t timestamp, int tz,
+ const char *message, void *cb_data)
+{
+ struct read_ref_at_cb *cb = cb_data;
+
+ set_read_ref_cutoffs(cb, timestamp, tz, message);
+ oidcpy(cb->oid, noid);
+ /* We just want the first entry */
+ return 1;
+}
+
+static int read_ref_at_ent_oldest(struct object_id *ooid, struct object_id *noid,
+ const char *email UNUSED,
+ timestamp_t timestamp, int tz,
+ const char *message, void *cb_data)
+{
+ struct read_ref_at_cb *cb = cb_data;
+
+ set_read_ref_cutoffs(cb, timestamp, tz, message);
+ oidcpy(cb->oid, ooid);
+ if (is_null_oid(cb->oid))
+ oidcpy(cb->oid, noid);
+ /* We just want the first entry */
+ return 1;
+}
+
+int read_ref_at(struct ref_store *refs, const char *refname,
+ unsigned int flags, timestamp_t at_time, int cnt,
+ struct object_id *oid, char **msg,
+ timestamp_t *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
+{
+ struct read_ref_at_cb cb;
+
+ memset(&cb, 0, sizeof(cb));
+ cb.refname = refname;
+ cb.at_time = at_time;
+ cb.cnt = cnt;
+ cb.msg = msg;
+ cb.cutoff_time = cutoff_time;
+ cb.cutoff_tz = cutoff_tz;
+ cb.cutoff_cnt = cutoff_cnt;
+ cb.oid = oid;
+
+ if (cb.cnt == 0) {
+ refs_for_each_reflog_ent_reverse(refs, refname, read_ref_at_ent_newest, &cb);
+ return 0;
+ }
+
+ refs_for_each_reflog_ent_reverse(refs, refname, read_ref_at_ent, &cb);
+
+ if (!cb.reccnt) {
+ if (flags & GET_OID_QUIETLY)
+ exit(128);
+ else
+ die(_("log for %s is empty"), refname);
+ }
+ if (cb.found_it)
+ return 0;
+
+ refs_for_each_reflog_ent(refs, refname, read_ref_at_ent_oldest, &cb);
+
+ return 1;
+}
+
+struct ref_transaction *ref_store_transaction_begin(struct ref_store *refs,
+ struct strbuf *err)
+{
+ struct ref_transaction *tr;
+ assert(err);
+
+ CALLOC_ARRAY(tr, 1);
+ tr->ref_store = refs;
+ return tr;
+}
+
+struct ref_transaction *ref_transaction_begin(struct strbuf *err)
+{
+ return ref_store_transaction_begin(get_main_ref_store(the_repository), err);
+}
+
+void ref_transaction_free(struct ref_transaction *transaction)
+{
+ size_t i;
+
+ if (!transaction)
+ return;
+
+ switch (transaction->state) {
+ case REF_TRANSACTION_OPEN:
+ case REF_TRANSACTION_CLOSED:
+ /* OK */
+ break;
+ case REF_TRANSACTION_PREPARED:
+ BUG("free called on a prepared reference transaction");
+ break;
+ default:
+ BUG("unexpected reference transaction state");
+ break;
+ }
+
+ for (i = 0; i < transaction->nr; i++) {
+ free(transaction->updates[i]->msg);
+ free(transaction->updates[i]);
+ }
+ free(transaction->updates);
+ free(transaction);
+}
+
+struct ref_update *ref_transaction_add_update(
+ struct ref_transaction *transaction,
+ const char *refname, unsigned int flags,
+ const struct object_id *new_oid,
+ const struct object_id *old_oid,
+ const char *msg)
+{
+ struct ref_update *update;
+
+ if (transaction->state != REF_TRANSACTION_OPEN)
+ BUG("update called for transaction that is not open");
+
+ FLEX_ALLOC_STR(update, refname, refname);
+ ALLOC_GROW(transaction->updates, transaction->nr + 1, transaction->alloc);
+ transaction->updates[transaction->nr++] = update;
+
+ update->flags = flags;
+
+ if (flags & REF_HAVE_NEW)
+ oidcpy(&update->new_oid, new_oid);
+ if (flags & REF_HAVE_OLD)
+ oidcpy(&update->old_oid, old_oid);
+ update->msg = normalize_reflog_message(msg);
+ return update;
+}
+
+int ref_transaction_update(struct ref_transaction *transaction,
+ const char *refname,
+ const struct object_id *new_oid,
+ const struct object_id *old_oid,
+ unsigned int flags, const char *msg,
+ struct strbuf *err)
+{
+ assert(err);
+
+ if (!(flags & REF_SKIP_REFNAME_VERIFICATION) &&
+ ((new_oid && !is_null_oid(new_oid)) ?
+ check_refname_format(refname, REFNAME_ALLOW_ONELEVEL) :
+ !refname_is_safe(refname))) {
+ strbuf_addf(err, _("refusing to update ref with bad name '%s'"),
+ refname);
+ return -1;
+ }
+
+ if (flags & ~REF_TRANSACTION_UPDATE_ALLOWED_FLAGS)
+ BUG("illegal flags 0x%x passed to ref_transaction_update()", flags);
+
+ /*
+ * Clear flags outside the allowed set; this should be a noop because
+ * of the BUG() check above, but it works around a -Wnonnull warning
+ * with some versions of "gcc -O3".
+ */
+ flags &= REF_TRANSACTION_UPDATE_ALLOWED_FLAGS;
+
+ flags |= (new_oid ? REF_HAVE_NEW : 0) | (old_oid ? REF_HAVE_OLD : 0);
+
+ ref_transaction_add_update(transaction, refname, flags,
+ new_oid, old_oid, msg);
+ return 0;
+}
+
+int ref_transaction_create(struct ref_transaction *transaction,
+ const char *refname,
+ const struct object_id *new_oid,
+ unsigned int flags, const char *msg,
+ struct strbuf *err)
+{
+ if (!new_oid || is_null_oid(new_oid)) {
+ strbuf_addf(err, "'%s' has a null OID", refname);
+ return 1;
+ }
+ return ref_transaction_update(transaction, refname, new_oid,
+ null_oid(), flags, msg, err);
+}
+
+int ref_transaction_delete(struct ref_transaction *transaction,
+ const char *refname,
+ const struct object_id *old_oid,
+ unsigned int flags, const char *msg,
+ struct strbuf *err)
+{
+ if (old_oid && is_null_oid(old_oid))
+ BUG("delete called with old_oid set to zeros");
+ return ref_transaction_update(transaction, refname,
+ null_oid(), old_oid,
+ flags, msg, err);
+}
+
+int ref_transaction_verify(struct ref_transaction *transaction,
+ const char *refname,
+ const struct object_id *old_oid,
+ unsigned int flags,
+ struct strbuf *err)
+{
+ if (!old_oid)
+ BUG("verify called with old_oid set to NULL");
+ return ref_transaction_update(transaction, refname,
+ NULL, old_oid,
+ flags, NULL, err);
+}
+
+int refs_update_ref(struct ref_store *refs, const char *msg,
+ const char *refname, const struct object_id *new_oid,
+ const struct object_id *old_oid, unsigned int flags,
+ enum action_on_err onerr)
+{
+ struct ref_transaction *t = NULL;
+ struct strbuf err = STRBUF_INIT;
+ int ret = 0;
+
+ t = ref_store_transaction_begin(refs, &err);
+ if (!t ||
+ ref_transaction_update(t, refname, new_oid, old_oid, flags, msg,
+ &err) ||
+ ref_transaction_commit(t, &err)) {
+ ret = 1;
+ ref_transaction_free(t);
+ }
+ if (ret) {
+ const char *str = _("update_ref failed for ref '%s': %s");
+
+ switch (onerr) {
+ case UPDATE_REFS_MSG_ON_ERR:
+ error(str, refname, err.buf);
+ break;
+ case UPDATE_REFS_DIE_ON_ERR:
+ die(str, refname, err.buf);
+ break;
+ case UPDATE_REFS_QUIET_ON_ERR:
+ break;
+ }
+ strbuf_release(&err);
+ return 1;
+ }
+ strbuf_release(&err);
+ if (t)
+ ref_transaction_free(t);
+ return 0;
+}
+
+int update_ref(const char *msg, const char *refname,
+ const struct object_id *new_oid,
+ const struct object_id *old_oid,
+ unsigned int flags, enum action_on_err onerr)
+{
+ return refs_update_ref(get_main_ref_store(the_repository), msg, refname, new_oid,
+ old_oid, flags, onerr);
+}
+
+/*
+ * Check that the string refname matches a rule of the form
+ * "{prefix}%.*s{suffix}". So "foo/bar/baz" would match the rule
+ * "foo/%.*s/baz", and return the string "bar".
+ */
+static const char *match_parse_rule(const char *refname, const char *rule,
+ size_t *len)
+{
+ /*
+ * Check that rule matches refname up to the first percent in the rule.
+ * We can bail immediately if not, but otherwise we leave "rule" at the
+ * %-placeholder, and "refname" at the start of the potential matched
+ * name.
+ */
+ while (*rule != '%') {
+ if (!*rule)
+ BUG("rev-parse rule did not have percent");
+ if (*refname++ != *rule++)
+ return NULL;
+ }
+
+ /*
+ * Check that our "%" is the expected placeholder. This assumes there
+ * are no other percents (placeholder or quoted) in the string, but
+ * that is sufficient for our rev-parse rules.
+ */
+ if (!skip_prefix(rule, "%.*s", &rule))
+ return NULL;
+
+ /*
+ * And now check that our suffix (if any) matches.
+ */
+ if (!strip_suffix(refname, rule, len))
+ return NULL;
+
+ return refname; /* len set by strip_suffix() */
+}
+
+char *refs_shorten_unambiguous_ref(struct ref_store *refs,
+ const char *refname, int strict)
+{
+ int i;
+ struct strbuf resolved_buf = STRBUF_INIT;
+
+ /* skip first rule, it will always match */
+ for (i = NUM_REV_PARSE_RULES - 1; i > 0 ; --i) {
+ int j;
+ int rules_to_fail = i;
+ const char *short_name;
+ size_t short_name_len;
+
+ short_name = match_parse_rule(refname, ref_rev_parse_rules[i],
+ &short_name_len);
+ if (!short_name)
+ continue;
+
+ /*
+ * in strict mode, all (except the matched one) rules
+ * must fail to resolve to a valid non-ambiguous ref
+ */
+ if (strict)
+ rules_to_fail = NUM_REV_PARSE_RULES;
+
+ /*
+ * check if the short name resolves to a valid ref,
+ * but use only rules prior to the matched one
+ */
+ for (j = 0; j < rules_to_fail; j++) {
+ const char *rule = ref_rev_parse_rules[j];
+
+ /* skip matched rule */
+ if (i == j)
+ continue;
+
+ /*
+ * the short name is ambiguous, if it resolves
+ * (with this previous rule) to a valid ref
+ * read_ref() returns 0 on success
+ */
+ strbuf_reset(&resolved_buf);
+ strbuf_addf(&resolved_buf, rule,
+ cast_size_t_to_int(short_name_len),
+ short_name);
+ if (refs_ref_exists(refs, resolved_buf.buf))
+ break;
+ }
+
+ /*
+ * short name is non-ambiguous if all previous rules
+ * haven't resolved to a valid ref
+ */
+ if (j == rules_to_fail) {
+ strbuf_release(&resolved_buf);
+ return xmemdupz(short_name, short_name_len);
+ }
+ }
+
+ strbuf_release(&resolved_buf);
+ return xstrdup(refname);
+}
+
+char *shorten_unambiguous_ref(const char *refname, int strict)
+{
+ return refs_shorten_unambiguous_ref(get_main_ref_store(the_repository),
+ refname, strict);
+}
+
+int parse_hide_refs_config(const char *var, const char *value, const char *section,
+ struct strvec *hide_refs)
+{
+ const char *key;
+ if (!strcmp("transfer.hiderefs", var) ||
+ (!parse_config_key(var, section, NULL, NULL, &key) &&
+ !strcmp(key, "hiderefs"))) {
+ char *ref;
+ int len;
+
+ if (!value)
+ return config_error_nonbool(var);
+
+ /* drop const to remove trailing '/' characters */
+ ref = (char *)strvec_push(hide_refs, value);
+ len = strlen(ref);
+ while (len && ref[len - 1] == '/')
+ ref[--len] = '\0';
+ }
+ return 0;
+}
+
+int ref_is_hidden(const char *refname, const char *refname_full,
+ const struct strvec *hide_refs)
+{
+ int i;
+
+ for (i = hide_refs->nr - 1; i >= 0; i--) {
+ const char *match = hide_refs->v[i];
+ const char *subject;
+ int neg = 0;
+ const char *p;
+
+ if (*match == '!') {
+ neg = 1;
+ match++;
+ }
+
+ if (*match == '^') {
+ subject = refname_full;
+ match++;
+ } else {
+ subject = refname;
+ }
+
+ /* refname can be NULL when namespaces are used. */
+ if (subject &&
+ skip_prefix(subject, match, &p) &&
+ (!*p || *p == '/'))
+ return !neg;
+ }
+ return 0;
+}
+
+const char **hidden_refs_to_excludes(const struct strvec *hide_refs)
+{
+ const char **pattern;
+ for (pattern = hide_refs->v; *pattern; pattern++) {
+ /*
+ * We can't feed any excludes from hidden refs config
+ * sections, since later rules may override previous
+ * ones. For example, with rules "refs/foo" and
+ * "!refs/foo/bar", we should show "refs/foo/bar" (and
+ * everything underneath it), but the earlier exclusion
+ * would cause us to skip all of "refs/foo". We
+ * likewise don't implement the namespace stripping
+ * required for '^' rules.
+ *
+ * Both are possible to do, but complicated, so avoid
+ * populating the jump list at all if we see either of
+ * these patterns.
+ */
+ if (**pattern == '!' || **pattern == '^')
+ return NULL;
+ }
+ return hide_refs->v;
+}
+
+const char *find_descendant_ref(const char *dirname,
+ const struct string_list *extras,
+ const struct string_list *skip)
+{
+ int pos;
+
+ if (!extras)
+ return NULL;
+
+ /*
+ * Look at the place where dirname would be inserted into
+ * extras. If there is an entry at that position that starts
+ * with dirname (remember, dirname includes the trailing
+ * slash) and is not in skip, then we have a conflict.
+ */
+ for (pos = string_list_find_insert_index(extras, dirname, 0);
+ pos < extras->nr; pos++) {
+ const char *extra_refname = extras->items[pos].string;
+
+ if (!starts_with(extra_refname, dirname))
+ break;
+
+ if (!skip || !string_list_has_string(skip, extra_refname))
+ return extra_refname;
+ }
+ return NULL;
+}
+
+int refs_head_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
+{
+ struct object_id oid;
+ int flag;
+
+ if (refs_resolve_ref_unsafe(refs, "HEAD", RESOLVE_REF_READING,
+ &oid, &flag))
+ return fn("HEAD", &oid, flag, cb_data);
+
+ return 0;
+}
+
+int head_ref(each_ref_fn fn, void *cb_data)
+{
+ return refs_head_ref(get_main_ref_store(the_repository), fn, cb_data);
+}
+
+struct ref_iterator *refs_ref_iterator_begin(
+ struct ref_store *refs,
+ const char *prefix,
+ const char **exclude_patterns,
+ int trim,
+ enum do_for_each_ref_flags flags)
+{
+ struct ref_iterator *iter;
+
+ if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) {
+ static int ref_paranoia = -1;
+
+ if (ref_paranoia < 0)
+ ref_paranoia = git_env_bool("GIT_REF_PARANOIA", 1);
+ if (ref_paranoia) {
+ flags |= DO_FOR_EACH_INCLUDE_BROKEN;
+ flags |= DO_FOR_EACH_OMIT_DANGLING_SYMREFS;
+ }
+ }
+
+ iter = refs->be->iterator_begin(refs, prefix, exclude_patterns, flags);
+ /*
+ * `iterator_begin()` already takes care of prefix, but we
+ * might need to do some trimming:
+ */
+ if (trim)
+ iter = prefix_ref_iterator_begin(iter, "", trim);
+
+ /* Sanity check for subclasses: */
+ if (!iter->ordered)
+ BUG("reference iterator is not ordered");
+
+ return iter;
+}
+
+/*
+ * Call fn for each reference in the specified submodule for which the
+ * refname begins with prefix. If trim is non-zero, then trim that
+ * many characters off the beginning of each refname before passing
+ * the refname to fn. flags can be DO_FOR_EACH_INCLUDE_BROKEN to
+ * include broken references in the iteration. If fn ever returns a
+ * non-zero value, stop the iteration and return that value;
+ * otherwise, return 0.
+ */
+static int do_for_each_repo_ref(struct repository *r, const char *prefix,
+ each_repo_ref_fn fn, int trim, int flags,
+ void *cb_data)
+{
+ struct ref_iterator *iter;
+ struct ref_store *refs = get_main_ref_store(r);
+
+ if (!refs)
+ return 0;
+
+ iter = refs_ref_iterator_begin(refs, prefix, NULL, trim, flags);
+
+ return do_for_each_repo_ref_iterator(r, iter, fn, cb_data);
+}
+
+struct do_for_each_ref_help {
+ each_ref_fn *fn;
+ void *cb_data;
+};
+
+static int do_for_each_ref_helper(struct repository *r UNUSED,
+ const char *refname,
+ const struct object_id *oid,
+ int flags,
+ void *cb_data)
+{
+ struct do_for_each_ref_help *hp = cb_data;
+
+ return hp->fn(refname, oid, flags, hp->cb_data);
+}
+
+static int do_for_each_ref(struct ref_store *refs, const char *prefix,
+ const char **exclude_patterns,
+ each_ref_fn fn, int trim,
+ enum do_for_each_ref_flags flags, void *cb_data)
+{
+ struct ref_iterator *iter;
+ struct do_for_each_ref_help hp = { fn, cb_data };
+
+ if (!refs)
+ return 0;
+
+ iter = refs_ref_iterator_begin(refs, prefix, exclude_patterns, trim,
+ flags);
+
+ return do_for_each_repo_ref_iterator(the_repository, iter,
+ do_for_each_ref_helper, &hp);
+}
+
+int refs_for_each_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
+{
+ return do_for_each_ref(refs, "", NULL, fn, 0, 0, cb_data);
+}
+
+int for_each_ref(each_ref_fn fn, void *cb_data)
+{
+ return refs_for_each_ref(get_main_ref_store(the_repository), fn, cb_data);
+}
+
+int refs_for_each_ref_in(struct ref_store *refs, const char *prefix,
+ each_ref_fn fn, void *cb_data)
+{
+ return do_for_each_ref(refs, prefix, NULL, fn, strlen(prefix), 0, cb_data);
+}
+
+int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
+{
+ return refs_for_each_ref_in(get_main_ref_store(the_repository), prefix, fn, cb_data);
+}
+
+int for_each_fullref_in(const char *prefix, each_ref_fn fn, void *cb_data)
+{
+ return do_for_each_ref(get_main_ref_store(the_repository),
+ prefix, NULL, fn, 0, 0, cb_data);
+}
+
+int refs_for_each_fullref_in(struct ref_store *refs, const char *prefix,
+ const char **exclude_patterns,
+ each_ref_fn fn, void *cb_data)
+{
+ return do_for_each_ref(refs, prefix, exclude_patterns, fn, 0, 0, cb_data);
+}
+
+int for_each_replace_ref(struct repository *r, each_repo_ref_fn fn, void *cb_data)
+{
+ const char *git_replace_ref_base = ref_namespace[NAMESPACE_REPLACE].ref;
+ return do_for_each_repo_ref(r, git_replace_ref_base, fn,
+ strlen(git_replace_ref_base),
+ DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
+}
+
+int for_each_namespaced_ref(const char **exclude_patterns,
+ each_ref_fn fn, void *cb_data)
+{
+ struct strbuf buf = STRBUF_INIT;
+ int ret;
+ strbuf_addf(&buf, "%srefs/", get_git_namespace());
+ ret = do_for_each_ref(get_main_ref_store(the_repository),
+ buf.buf, exclude_patterns, fn, 0, 0, cb_data);
+ strbuf_release(&buf);
+ return ret;
+}
+
+int refs_for_each_rawref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
+{
+ return do_for_each_ref(refs, "", NULL, fn, 0,
+ DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
+}
+
+int for_each_rawref(each_ref_fn fn, void *cb_data)
+{
+ return refs_for_each_rawref(get_main_ref_store(the_repository), fn, cb_data);
+}
+
+static int qsort_strcmp(const void *va, const void *vb)
+{
+ const char *a = *(const char **)va;
+ const char *b = *(const char **)vb;
+
+ return strcmp(a, b);
+}
+
+static void find_longest_prefixes_1(struct string_list *out,
+ struct strbuf *prefix,
+ const char **patterns, size_t nr)
+{
+ size_t i;
+
+ for (i = 0; i < nr; i++) {
+ char c = patterns[i][prefix->len];
+ if (!c || is_glob_special(c)) {
+ string_list_append(out, prefix->buf);
+ return;
+ }
+ }
+
+ i = 0;
+ while (i < nr) {
+ size_t end;
+
+ /*
+ * Set "end" to the index of the element _after_ the last one
+ * in our group.
+ */
+ for (end = i + 1; end < nr; end++) {
+ if (patterns[i][prefix->len] != patterns[end][prefix->len])
+ break;
+ }
+
+ strbuf_addch(prefix, patterns[i][prefix->len]);
+ find_longest_prefixes_1(out, prefix, patterns + i, end - i);
+ strbuf_setlen(prefix, prefix->len - 1);
+
+ i = end;
+ }
+}
+
+static void find_longest_prefixes(struct string_list *out,
+ const char **patterns)
+{
+ struct strvec sorted = STRVEC_INIT;
+ struct strbuf prefix = STRBUF_INIT;
+
+ strvec_pushv(&sorted, patterns);
+ QSORT(sorted.v, sorted.nr, qsort_strcmp);
+
+ find_longest_prefixes_1(out, &prefix, sorted.v, sorted.nr);
+
+ strvec_clear(&sorted);
+ strbuf_release(&prefix);
+}
+
+int refs_for_each_fullref_in_prefixes(struct ref_store *ref_store,
+ const char *namespace,
+ const char **patterns,
+ const char **exclude_patterns,
+ each_ref_fn fn, void *cb_data)
+{
+ struct string_list prefixes = STRING_LIST_INIT_DUP;
+ struct string_list_item *prefix;
+ struct strbuf buf = STRBUF_INIT;
+ int ret = 0, namespace_len;
+
+ find_longest_prefixes(&prefixes, patterns);
+
+ if (namespace)
+ strbuf_addstr(&buf, namespace);
+ namespace_len = buf.len;
+
+ for_each_string_list_item(prefix, &prefixes) {
+ strbuf_addstr(&buf, prefix->string);
+ ret = refs_for_each_fullref_in(ref_store, buf.buf,
+ exclude_patterns, fn, cb_data);
+ if (ret)
+ break;
+ strbuf_setlen(&buf, namespace_len);
+ }
+
+ string_list_clear(&prefixes, 0);
+ strbuf_release(&buf);
+ return ret;
+}
+
+static int refs_read_special_head(struct ref_store *ref_store,
+ const char *refname, struct object_id *oid,
+ struct strbuf *referent, unsigned int *type,
+ int *failure_errno)
+{
+ struct strbuf full_path = STRBUF_INIT;
+ struct strbuf content = STRBUF_INIT;
+ int result = -1;
+ strbuf_addf(&full_path, "%s/%s", ref_store->gitdir, refname);
+
+ if (strbuf_read_file(&content, full_path.buf, 0) < 0)
+ goto done;
+
+ result = parse_loose_ref_contents(content.buf, oid, referent, type,
+ failure_errno);
+
+done:
+ strbuf_release(&full_path);
+ strbuf_release(&content);
+ return result;
+}
+
+int refs_read_raw_ref(struct ref_store *ref_store, const char *refname,
+ struct object_id *oid, struct strbuf *referent,
+ unsigned int *type, int *failure_errno)
+{
+ assert(failure_errno);
+ if (!strcmp(refname, "FETCH_HEAD") || !strcmp(refname, "MERGE_HEAD")) {
+ return refs_read_special_head(ref_store, refname, oid, referent,
+ type, failure_errno);
+ }
+
+ return ref_store->be->read_raw_ref(ref_store, refname, oid, referent,
+ type, failure_errno);
+}
+
+int refs_read_symbolic_ref(struct ref_store *ref_store, const char *refname,
+ struct strbuf *referent)
+{
+ return ref_store->be->read_symbolic_ref(ref_store, refname, referent);
+}
+
+const char *refs_resolve_ref_unsafe(struct ref_store *refs,
+ const char *refname,
+ int resolve_flags,
+ struct object_id *oid,
+ int *flags)
+{
+ static struct strbuf sb_refname = STRBUF_INIT;
+ struct object_id unused_oid;
+ int unused_flags;
+ int symref_count;
+
+ if (!oid)
+ oid = &unused_oid;
+ if (!flags)
+ flags = &unused_flags;
+
+ *flags = 0;
+
+ if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
+ if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
+ !refname_is_safe(refname))
+ return NULL;
+
+ /*
+ * repo_dwim_ref() uses REF_ISBROKEN to distinguish between
+ * missing refs and refs that were present but invalid,
+ * to complain about the latter to stderr.
+ *
+ * We don't know whether the ref exists, so don't set
+ * REF_ISBROKEN yet.
+ */
+ *flags |= REF_BAD_NAME;
+ }
+
+ for (symref_count = 0; symref_count < SYMREF_MAXDEPTH; symref_count++) {
+ unsigned int read_flags = 0;
+ int failure_errno;
+
+ if (refs_read_raw_ref(refs, refname, oid, &sb_refname,
+ &read_flags, &failure_errno)) {
+ *flags |= read_flags;
+
+ /* In reading mode, refs must eventually resolve */
+ if (resolve_flags & RESOLVE_REF_READING)
+ return NULL;
+
+ /*
+ * Otherwise a missing ref is OK. But the files backend
+ * may show errors besides ENOENT if there are
+ * similarly-named refs.
+ */
+ if (failure_errno != ENOENT &&
+ failure_errno != EISDIR &&
+ failure_errno != ENOTDIR)
+ return NULL;
+
+ oidclr(oid);
+ if (*flags & REF_BAD_NAME)
+ *flags |= REF_ISBROKEN;
+ return refname;
+ }
+
+ *flags |= read_flags;
+
+ if (!(read_flags & REF_ISSYMREF)) {
+ if (*flags & REF_BAD_NAME) {
+ oidclr(oid);
+ *flags |= REF_ISBROKEN;
+ }
+ return refname;
+ }
+
+ refname = sb_refname.buf;
+ if (resolve_flags & RESOLVE_REF_NO_RECURSE) {
+ oidclr(oid);
+ return refname;
+ }
+ if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
+ if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
+ !refname_is_safe(refname))
+ return NULL;
+
+ *flags |= REF_ISBROKEN | REF_BAD_NAME;
+ }
+ }
+
+ return NULL;
+}
+
+/* backend functions */
+int refs_init_db(struct strbuf *err)
+{
+ struct ref_store *refs = get_main_ref_store(the_repository);
+
+ return refs->be->init_db(refs, err);
+}
+
+const char *resolve_ref_unsafe(const char *refname, int resolve_flags,
+ struct object_id *oid, int *flags)
+{
+ return refs_resolve_ref_unsafe(get_main_ref_store(the_repository), refname,
+ resolve_flags, oid, flags);
+}
+
+int resolve_gitlink_ref(const char *submodule, const char *refname,
+ struct object_id *oid)
+{
+ struct ref_store *refs;
+ int flags;
+
+ refs = get_submodule_ref_store(submodule);
+
+ if (!refs)
+ return -1;
+
+ if (!refs_resolve_ref_unsafe(refs, refname, 0, oid, &flags) ||
+ is_null_oid(oid))
+ return -1;
+ return 0;
+}
+
+struct ref_store_hash_entry
+{
+ struct hashmap_entry ent;
+
+ struct ref_store *refs;
+
+ /* NUL-terminated identifier of the ref store: */
+ char name[FLEX_ARRAY];
+};
+
+static int ref_store_hash_cmp(const void *cmp_data UNUSED,
+ const struct hashmap_entry *eptr,
+ const struct hashmap_entry *entry_or_key,
+ const void *keydata)
+{
+ const struct ref_store_hash_entry *e1, *e2;
+ const char *name;
+
+ e1 = container_of(eptr, const struct ref_store_hash_entry, ent);
+ e2 = container_of(entry_or_key, const struct ref_store_hash_entry, ent);
+ name = keydata ? keydata : e2->name;
+
+ return strcmp(e1->name, name);
+}
+
+static struct ref_store_hash_entry *alloc_ref_store_hash_entry(
+ const char *name, struct ref_store *refs)
+{
+ struct ref_store_hash_entry *entry;
+
+ FLEX_ALLOC_STR(entry, name, name);
+ hashmap_entry_init(&entry->ent, strhash(name));
+ entry->refs = refs;
+ return entry;
+}
+
+/* A hashmap of ref_stores, stored by submodule name: */
+static struct hashmap submodule_ref_stores;
+
+/* A hashmap of ref_stores, stored by worktree id: */
+static struct hashmap worktree_ref_stores;
+
+/*
+ * Look up a ref store by name. If that ref_store hasn't been
+ * registered yet, return NULL.
+ */
+static struct ref_store *lookup_ref_store_map(struct hashmap *map,
+ const char *name)
+{
+ struct ref_store_hash_entry *entry;
+ unsigned int hash;
+
+ if (!map->tablesize)
+ /* It's initialized on demand in register_ref_store(). */
+ return NULL;
+
+ hash = strhash(name);
+ entry = hashmap_get_entry_from_hash(map, hash, name,
+ struct ref_store_hash_entry, ent);
+ return entry ? entry->refs : NULL;
+}
+
+/*
+ * Create, record, and return a ref_store instance for the specified
+ * gitdir.
+ */
+static struct ref_store *ref_store_init(struct repository *repo,
+ const char *gitdir,
+ unsigned int flags)
+{
+ const char *be_name = "files";
+ struct ref_storage_be *be = find_ref_storage_backend(be_name);
+ struct ref_store *refs;
+
+ if (!be)
+ BUG("reference backend %s is unknown", be_name);
+
+ refs = be->init(repo, gitdir, flags);
+ return refs;
+}
+
+struct ref_store *get_main_ref_store(struct repository *r)
+{
+ if (r->refs_private)
+ return r->refs_private;
+
+ if (!r->gitdir)
+ BUG("attempting to get main_ref_store outside of repository");
+
+ r->refs_private = ref_store_init(r, r->gitdir, REF_STORE_ALL_CAPS);
+ r->refs_private = maybe_debug_wrap_ref_store(r->gitdir, r->refs_private);
+ return r->refs_private;
+}
+
+/*
+ * Associate a ref store with a name. It is a fatal error to call this
+ * function twice for the same name.
+ */
+static void register_ref_store_map(struct hashmap *map,
+ const char *type,
+ struct ref_store *refs,
+ const char *name)
+{
+ struct ref_store_hash_entry *entry;
+
+ if (!map->tablesize)
+ hashmap_init(map, ref_store_hash_cmp, NULL, 0);
+
+ entry = alloc_ref_store_hash_entry(name, refs);
+ if (hashmap_put(map, &entry->ent))
+ BUG("%s ref_store '%s' initialized twice", type, name);
+}
+
+struct ref_store *get_submodule_ref_store(const char *submodule)
+{
+ struct strbuf submodule_sb = STRBUF_INIT;
+ struct ref_store *refs;
+ char *to_free = NULL;
+ size_t len;
+ struct repository *subrepo;
+
+ if (!submodule)
+ return NULL;
+
+ len = strlen(submodule);
+ while (len && is_dir_sep(submodule[len - 1]))
+ len--;
+ if (!len)
+ return NULL;
+
+ if (submodule[len])
+ /* We need to strip off one or more trailing slashes */
+ submodule = to_free = xmemdupz(submodule, len);
+
+ refs = lookup_ref_store_map(&submodule_ref_stores, submodule);
+ if (refs)
+ goto done;
+
+ strbuf_addstr(&submodule_sb, submodule);
+ if (!is_nonbare_repository_dir(&submodule_sb))
+ goto done;
+
+ if (submodule_to_gitdir(&submodule_sb, submodule))
+ goto done;
+
+ subrepo = xmalloc(sizeof(*subrepo));
+ /*
+ * NEEDSWORK: Make get_submodule_ref_store() work with arbitrary
+ * superprojects other than the_repository. This probably should be
+ * done by making it take a struct repository * parameter instead of a
+ * submodule path.
+ */
+ if (repo_submodule_init(subrepo, the_repository, submodule,
+ null_oid())) {
+ free(subrepo);
+ goto done;
+ }
+ refs = ref_store_init(subrepo, submodule_sb.buf,
+ REF_STORE_READ | REF_STORE_ODB);
+ register_ref_store_map(&submodule_ref_stores, "submodule",
+ refs, submodule);
+
+done:
+ strbuf_release(&submodule_sb);
+ free(to_free);
+
+ return refs;
+}
+
+struct ref_store *get_worktree_ref_store(const struct worktree *wt)
+{
+ struct ref_store *refs;
+ const char *id;
+
+ if (wt->is_current)
+ return get_main_ref_store(the_repository);
+
+ id = wt->id ? wt->id : "/";
+ refs = lookup_ref_store_map(&worktree_ref_stores, id);
+ if (refs)
+ return refs;
+
+ if (wt->id)
+ refs = ref_store_init(the_repository,
+ git_common_path("worktrees/%s", wt->id),
+ REF_STORE_ALL_CAPS);
+ else
+ refs = ref_store_init(the_repository,
+ get_git_common_dir(),
+ REF_STORE_ALL_CAPS);
+
+ if (refs)
+ register_ref_store_map(&worktree_ref_stores, "worktree",
+ refs, id);
+ return refs;
+}
+
+void base_ref_store_init(struct ref_store *refs, struct repository *repo,
+ const char *path, const struct ref_storage_be *be)
+{
+ refs->be = be;
+ refs->repo = repo;
+ refs->gitdir = xstrdup(path);
+}
+
+/* backend functions */
+int refs_pack_refs(struct ref_store *refs, struct pack_refs_opts *opts)
+{
+ return refs->be->pack_refs(refs, opts);
+}
+
+int peel_iterated_oid(const struct object_id *base, struct object_id *peeled)
+{
+ if (current_ref_iter &&
+ (current_ref_iter->oid == base ||
+ oideq(current_ref_iter->oid, base)))
+ return ref_iterator_peel(current_ref_iter, peeled);
+
+ return peel_object(base, peeled) ? -1 : 0;
+}
+
+int refs_create_symref(struct ref_store *refs,
+ const char *ref_target,
+ const char *refs_heads_master,
+ const char *logmsg)
+{
+ char *msg;
+ int retval;
+
+ msg = normalize_reflog_message(logmsg);
+ retval = refs->be->create_symref(refs, ref_target, refs_heads_master,
+ msg);
+ free(msg);
+ return retval;
+}
+
+int create_symref(const char *ref_target, const char *refs_heads_master,
+ const char *logmsg)
+{
+ return refs_create_symref(get_main_ref_store(the_repository), ref_target,
+ refs_heads_master, logmsg);
+}
+
+int ref_update_reject_duplicates(struct string_list *refnames,
+ struct strbuf *err)
+{
+ size_t i, n = refnames->nr;
+
+ assert(err);
+
+ for (i = 1; i < n; i++) {
+ int cmp = strcmp(refnames->items[i - 1].string,
+ refnames->items[i].string);
+
+ if (!cmp) {
+ strbuf_addf(err,
+ _("multiple updates for ref '%s' not allowed"),
+ refnames->items[i].string);
+ return 1;
+ } else if (cmp > 0) {
+ BUG("ref_update_reject_duplicates() received unsorted list");
+ }
+ }
+ return 0;
+}
+
+static int run_transaction_hook(struct ref_transaction *transaction,
+ const char *state)
+{
+ struct child_process proc = CHILD_PROCESS_INIT;
+ struct strbuf buf = STRBUF_INIT;
+ const char *hook;
+ int ret = 0, i;
+
+ hook = find_hook("reference-transaction");
+ if (!hook)
+ return ret;
+
+ strvec_pushl(&proc.args, hook, state, NULL);
+ proc.in = -1;
+ proc.stdout_to_stderr = 1;
+ proc.trace2_hook_name = "reference-transaction";
+
+ ret = start_command(&proc);
+ if (ret)
+ return ret;
+
+ sigchain_push(SIGPIPE, SIG_IGN);
+
+ for (i = 0; i < transaction->nr; i++) {
+ struct ref_update *update = transaction->updates[i];
+
+ strbuf_reset(&buf);
+ strbuf_addf(&buf, "%s %s %s\n",
+ oid_to_hex(&update->old_oid),
+ oid_to_hex(&update->new_oid),
+ update->refname);
+
+ if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
+ if (errno != EPIPE) {
+ /* Don't leak errno outside this API */
+ errno = 0;
+ ret = -1;
+ }
+ break;
+ }
+ }
+
+ close(proc.in);
+ sigchain_pop(SIGPIPE);
+ strbuf_release(&buf);
+
+ ret |= finish_command(&proc);
+ return ret;
+}
+
+int ref_transaction_prepare(struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ struct ref_store *refs = transaction->ref_store;
+ int ret;
+
+ switch (transaction->state) {
+ case REF_TRANSACTION_OPEN:
+ /* Good. */
+ break;
+ case REF_TRANSACTION_PREPARED:
+ BUG("prepare called twice on reference transaction");
+ break;
+ case REF_TRANSACTION_CLOSED:
+ BUG("prepare called on a closed reference transaction");
+ break;
+ default:
+ BUG("unexpected reference transaction state");
+ break;
+ }
+
+ if (refs->repo->objects->odb->disable_ref_updates) {
+ strbuf_addstr(err,
+ _("ref updates forbidden inside quarantine environment"));
+ return -1;
+ }
+
+ ret = refs->be->transaction_prepare(refs, transaction, err);
+ if (ret)
+ return ret;
+
+ ret = run_transaction_hook(transaction, "prepared");
+ if (ret) {
+ ref_transaction_abort(transaction, err);
+ die(_("ref updates aborted by hook"));
+ }
+
+ return 0;
+}
+
+int ref_transaction_abort(struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ struct ref_store *refs = transaction->ref_store;
+ int ret = 0;
+
+ switch (transaction->state) {
+ case REF_TRANSACTION_OPEN:
+ /* No need to abort explicitly. */
+ break;
+ case REF_TRANSACTION_PREPARED:
+ ret = refs->be->transaction_abort(refs, transaction, err);
+ break;
+ case REF_TRANSACTION_CLOSED:
+ BUG("abort called on a closed reference transaction");
+ break;
+ default:
+ BUG("unexpected reference transaction state");
+ break;
+ }
+
+ run_transaction_hook(transaction, "aborted");
+
+ ref_transaction_free(transaction);
+ return ret;
+}
+
+int ref_transaction_commit(struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ struct ref_store *refs = transaction->ref_store;
+ int ret;
+
+ switch (transaction->state) {
+ case REF_TRANSACTION_OPEN:
+ /* Need to prepare first. */
+ ret = ref_transaction_prepare(transaction, err);
+ if (ret)
+ return ret;
+ break;
+ case REF_TRANSACTION_PREPARED:
+ /* Fall through to finish. */
+ break;
+ case REF_TRANSACTION_CLOSED:
+ BUG("commit called on a closed reference transaction");
+ break;
+ default:
+ BUG("unexpected reference transaction state");
+ break;
+ }
+
+ ret = refs->be->transaction_finish(refs, transaction, err);
+ if (!ret)
+ run_transaction_hook(transaction, "committed");
+ return ret;
+}
+
+int refs_verify_refname_available(struct ref_store *refs,
+ const char *refname,
+ const struct string_list *extras,
+ const struct string_list *skip,
+ struct strbuf *err)
+{
+ const char *slash;
+ const char *extra_refname;
+ struct strbuf dirname = STRBUF_INIT;
+ struct strbuf referent = STRBUF_INIT;
+ struct object_id oid;
+ unsigned int type;
+ struct ref_iterator *iter;
+ int ok;
+ int ret = -1;
+
+ /*
+ * For the sake of comments in this function, suppose that
+ * refname is "refs/foo/bar".
+ */
+
+ assert(err);
+
+ strbuf_grow(&dirname, strlen(refname) + 1);
+ for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) {
+ /*
+ * Just saying "Is a directory" when we e.g. can't
+ * lock some multi-level ref isn't very informative,
+ * the user won't be told *what* is a directory, so
+ * let's not use strerror() below.
+ */
+ int ignore_errno;
+ /* Expand dirname to the new prefix, not including the trailing slash: */
+ strbuf_add(&dirname, refname + dirname.len, slash - refname - dirname.len);
+
+ /*
+ * We are still at a leading dir of the refname (e.g.,
+ * "refs/foo"; if there is a reference with that name,
+ * it is a conflict, *unless* it is in skip.
+ */
+ if (skip && string_list_has_string(skip, dirname.buf))
+ continue;
+
+ if (!refs_read_raw_ref(refs, dirname.buf, &oid, &referent,
+ &type, &ignore_errno)) {
+ strbuf_addf(err, _("'%s' exists; cannot create '%s'"),
+ dirname.buf, refname);
+ goto cleanup;
+ }
+
+ if (extras && string_list_has_string(extras, dirname.buf)) {
+ strbuf_addf(err, _("cannot process '%s' and '%s' at the same time"),
+ refname, dirname.buf);
+ goto cleanup;
+ }
+ }
+
+ /*
+ * We are at the leaf of our refname (e.g., "refs/foo/bar").
+ * There is no point in searching for a reference with that
+ * name, because a refname isn't considered to conflict with
+ * itself. But we still need to check for references whose
+ * names are in the "refs/foo/bar/" namespace, because they
+ * *do* conflict.
+ */
+ strbuf_addstr(&dirname, refname + dirname.len);
+ strbuf_addch(&dirname, '/');
+
+ iter = refs_ref_iterator_begin(refs, dirname.buf, NULL, 0,
+ DO_FOR_EACH_INCLUDE_BROKEN);
+ while ((ok = ref_iterator_advance(iter)) == ITER_OK) {
+ if (skip &&
+ string_list_has_string(skip, iter->refname))
+ continue;
+
+ strbuf_addf(err, _("'%s' exists; cannot create '%s'"),
+ iter->refname, refname);
+ ref_iterator_abort(iter);
+ goto cleanup;
+ }
+
+ if (ok != ITER_DONE)
+ BUG("error while iterating over references");
+
+ extra_refname = find_descendant_ref(dirname.buf, extras, skip);
+ if (extra_refname)
+ strbuf_addf(err, _("cannot process '%s' and '%s' at the same time"),
+ refname, extra_refname);
+ else
+ ret = 0;
+
+cleanup:
+ strbuf_release(&referent);
+ strbuf_release(&dirname);
+ return ret;
+}
+
+int refs_for_each_reflog(struct ref_store *refs, each_ref_fn fn, void *cb_data)
+{
+ struct ref_iterator *iter;
+ struct do_for_each_ref_help hp = { fn, cb_data };
+
+ iter = refs->be->reflog_iterator_begin(refs);
+
+ return do_for_each_repo_ref_iterator(the_repository, iter,
+ do_for_each_ref_helper, &hp);
+}
+
+int for_each_reflog(each_ref_fn fn, void *cb_data)
+{
+ return refs_for_each_reflog(get_main_ref_store(the_repository), fn, cb_data);
+}
+
+int refs_for_each_reflog_ent_reverse(struct ref_store *refs,
+ const char *refname,
+ each_reflog_ent_fn fn,
+ void *cb_data)
+{
+ return refs->be->for_each_reflog_ent_reverse(refs, refname,
+ fn, cb_data);
+}
+
+int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn,
+ void *cb_data)
+{
+ return refs_for_each_reflog_ent_reverse(get_main_ref_store(the_repository),
+ refname, fn, cb_data);
+}
+
+int refs_for_each_reflog_ent(struct ref_store *refs, const char *refname,
+ each_reflog_ent_fn fn, void *cb_data)
+{
+ return refs->be->for_each_reflog_ent(refs, refname, fn, cb_data);
+}
+
+int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn,
+ void *cb_data)
+{
+ return refs_for_each_reflog_ent(get_main_ref_store(the_repository), refname,
+ fn, cb_data);
+}
+
+int refs_reflog_exists(struct ref_store *refs, const char *refname)
+{
+ return refs->be->reflog_exists(refs, refname);
+}
+
+int reflog_exists(const char *refname)
+{
+ return refs_reflog_exists(get_main_ref_store(the_repository), refname);
+}
+
+int refs_create_reflog(struct ref_store *refs, const char *refname,
+ struct strbuf *err)
+{
+ return refs->be->create_reflog(refs, refname, err);
+}
+
+int safe_create_reflog(const char *refname, struct strbuf *err)
+{
+ return refs_create_reflog(get_main_ref_store(the_repository), refname,
+ err);
+}
+
+int refs_delete_reflog(struct ref_store *refs, const char *refname)
+{
+ return refs->be->delete_reflog(refs, refname);
+}
+
+int delete_reflog(const char *refname)
+{
+ return refs_delete_reflog(get_main_ref_store(the_repository), refname);
+}
+
+int refs_reflog_expire(struct ref_store *refs,
+ const char *refname,
+ unsigned int flags,
+ reflog_expiry_prepare_fn prepare_fn,
+ reflog_expiry_should_prune_fn should_prune_fn,
+ reflog_expiry_cleanup_fn cleanup_fn,
+ void *policy_cb_data)
+{
+ return refs->be->reflog_expire(refs, refname, flags,
+ prepare_fn, should_prune_fn,
+ cleanup_fn, policy_cb_data);
+}
+
+int reflog_expire(const char *refname,
+ unsigned int flags,
+ reflog_expiry_prepare_fn prepare_fn,
+ reflog_expiry_should_prune_fn should_prune_fn,
+ reflog_expiry_cleanup_fn cleanup_fn,
+ void *policy_cb_data)
+{
+ return refs_reflog_expire(get_main_ref_store(the_repository),
+ refname, flags,
+ prepare_fn, should_prune_fn,
+ cleanup_fn, policy_cb_data);
+}
+
+int initial_ref_transaction_commit(struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ struct ref_store *refs = transaction->ref_store;
+
+ return refs->be->initial_transaction_commit(refs, transaction, err);
+}
+
+void ref_transaction_for_each_queued_update(struct ref_transaction *transaction,
+ ref_transaction_for_each_queued_update_fn cb,
+ void *cb_data)
+{
+ int i;
+
+ for (i = 0; i < transaction->nr; i++) {
+ struct ref_update *update = transaction->updates[i];
+
+ cb(update->refname,
+ (update->flags & REF_HAVE_OLD) ? &update->old_oid : NULL,
+ (update->flags & REF_HAVE_NEW) ? &update->new_oid : NULL,
+ cb_data);
+ }
+}
+
+int refs_delete_refs(struct ref_store *refs, const char *logmsg,
+ struct string_list *refnames, unsigned int flags)
+{
+ char *msg;
+ int retval;
+
+ msg = normalize_reflog_message(logmsg);
+ retval = refs->be->delete_refs(refs, msg, refnames, flags);
+ free(msg);
+ return retval;
+}
+
+int delete_refs(const char *msg, struct string_list *refnames,
+ unsigned int flags)
+{
+ return refs_delete_refs(get_main_ref_store(the_repository), msg, refnames, flags);
+}
+
+int refs_rename_ref(struct ref_store *refs, const char *oldref,
+ const char *newref, const char *logmsg)
+{
+ char *msg;
+ int retval;
+
+ msg = normalize_reflog_message(logmsg);
+ retval = refs->be->rename_ref(refs, oldref, newref, msg);
+ free(msg);
+ return retval;
+}
+
+int rename_ref(const char *oldref, const char *newref, const char *logmsg)
+{
+ return refs_rename_ref(get_main_ref_store(the_repository), oldref, newref, logmsg);
+}
+
+int refs_copy_existing_ref(struct ref_store *refs, const char *oldref,
+ const char *newref, const char *logmsg)
+{
+ char *msg;
+ int retval;
+
+ msg = normalize_reflog_message(logmsg);
+ retval = refs->be->copy_ref(refs, oldref, newref, msg);
+ free(msg);
+ return retval;
+}
+
+int copy_existing_ref(const char *oldref, const char *newref, const char *logmsg)
+{
+ return refs_copy_existing_ref(get_main_ref_store(the_repository), oldref, newref, logmsg);
+}