From: Nguyễn Thái Ngọc Duy Date: Sun, 13 Nov 2011 10:22:14 +0000 (+0700) Subject: Convert many resolve_ref() calls to read_ref*() and ref_exists() X-Git-Tag: v1.7.9-rc0~82^2~1 X-Git-Url: https://git.tokkee.org/?a=commitdiff_plain;h=c689332;p=git.git Convert many resolve_ref() calls to read_ref*() and ref_exists() resolve_ref() may return a pointer to a static buffer, which is not safe for long-term use because if another resolve_ref() call happens, the buffer may be changed. Many call sites though do not care about this buffer. They simply check if the return value is NULL or not. Convert all these call sites to new wrappers to reduce resolve_ref() calls from 57 to 34. If we change resolve_ref() prototype later on to avoid passing static buffer out, this helps reduce changes. Signed-off-by: Nguyễn Thái Ngọc Duy Signed-off-by: Junio C Hamano --- diff --git a/builtin/branch.c b/builtin/branch.c index 51ca6a02d..0fe9c4dfe 100644 --- a/builtin/branch.c +++ b/builtin/branch.c @@ -186,7 +186,7 @@ static int delete_branches(int argc, const char **argv, int force, int kinds) free(name); name = xstrdup(mkpath(fmt, bname.buf)); - if (!resolve_ref(name, sha1, 1, NULL)) { + if (read_ref(name, sha1)) { error(_("%sbranch '%s' not found."), remote, bname.buf); ret = 1; @@ -565,7 +565,6 @@ static int print_ref_list(int kinds, int detached, int verbose, int abbrev, stru static void rename_branch(const char *oldname, const char *newname, int force) { struct strbuf oldref = STRBUF_INIT, newref = STRBUF_INIT, logmsg = STRBUF_INIT; - unsigned char sha1[20]; struct strbuf oldsection = STRBUF_INIT, newsection = STRBUF_INIT; int recovery = 0; @@ -577,7 +576,7 @@ static void rename_branch(const char *oldname, const char *newname, int force) * Bad name --- this could be an attempt to rename a * ref that we used to allow to be created by accident. */ - if (resolve_ref(oldref.buf, sha1, 1, NULL)) + if (ref_exists(oldref.buf)) recovery = 1; else die(_("Invalid branch name: '%s'"), oldname); diff --git a/builtin/checkout.c b/builtin/checkout.c index 2a8077242..beeaee411 100644 --- a/builtin/checkout.c +++ b/builtin/checkout.c @@ -288,7 +288,7 @@ static int checkout_paths(struct tree *source_tree, const char **pathspec, commit_locked_index(lock_file)) die(_("unable to write new index file")); - resolve_ref("HEAD", rev, 0, &flag); + read_ref_full("HEAD", rev, 0, &flag); head = lookup_commit_reference_gently(rev, 1); errs |= post_checkout_hook(head, head, 0); @@ -866,7 +866,7 @@ static int parse_branchname_arg(int argc, const char **argv, setup_branch_path(new); if (!check_refname_format(new->path, 0) && - resolve_ref(new->path, branch_rev, 1, NULL)) + !read_ref(new->path, branch_rev)) hashcpy(rev, branch_rev); else new->path = NULL; /* not an existing branch */ diff --git a/builtin/merge.c b/builtin/merge.c index dffd5ec12..42b4f9e7b 100644 --- a/builtin/merge.c +++ b/builtin/merge.c @@ -420,7 +420,7 @@ static struct object *want_commit(const char *name) static void merge_name(const char *remote, struct strbuf *msg) { struct object *remote_head; - unsigned char branch_head[20], buf_sha[20]; + unsigned char branch_head[20]; struct strbuf buf = STRBUF_INIT; struct strbuf bname = STRBUF_INIT; const char *ptr; @@ -479,7 +479,7 @@ static void merge_name(const char *remote, struct strbuf *msg) strbuf_addstr(&truname, "refs/heads/"); strbuf_addstr(&truname, remote); strbuf_setlen(&truname, truname.len - len); - if (resolve_ref(truname.buf, buf_sha, 1, NULL)) { + if (ref_exists(truname.buf)) { strbuf_addf(msg, "%s\t\tbranch '%s'%s of .\n", sha1_to_hex(remote_head->sha1), diff --git a/builtin/remote.c b/builtin/remote.c index c81064381..407abfb0f 100644 --- a/builtin/remote.c +++ b/builtin/remote.c @@ -343,8 +343,7 @@ static int get_ref_states(const struct ref *remote_refs, struct ref_states *stat states->tracked.strdup_strings = 1; states->stale.strdup_strings = 1; for (ref = fetch_map; ref; ref = ref->next) { - unsigned char sha1[20]; - if (!ref->peer_ref || read_ref(ref->peer_ref->name, sha1)) + if (!ref->peer_ref || !ref_exists(ref->peer_ref->name)) string_list_append(&states->new, abbrev_branch(ref->name)); else string_list_append(&states->tracked, abbrev_branch(ref->name)); @@ -710,7 +709,7 @@ static int mv(int argc, const char **argv) int flag = 0; unsigned char sha1[20]; - resolve_ref(item->string, sha1, 1, &flag); + read_ref_full(item->string, sha1, 1, &flag); if (!(flag & REF_ISSYMREF)) continue; if (delete_ref(item->string, NULL, REF_NODEREF)) @@ -1220,10 +1219,9 @@ static int set_head(int argc, const char **argv) usage_with_options(builtin_remote_sethead_usage, options); if (head_name) { - unsigned char sha1[20]; strbuf_addf(&buf2, "refs/remotes/%s/%s", argv[0], head_name); /* make sure it's valid */ - if (!resolve_ref(buf2.buf, sha1, 1, NULL)) + if (!ref_exists(buf2.buf)) result |= error("Not a valid ref: %s", buf2.buf); else if (create_symref(buf.buf, buf2.buf, "remote set-head")) result |= error("Could not setup %s", buf.buf); diff --git a/builtin/replace.c b/builtin/replace.c index 517fa1031..4a8970e9c 100644 --- a/builtin/replace.c +++ b/builtin/replace.c @@ -58,7 +58,7 @@ static int for_each_replace_name(const char **argv, each_replace_name_fn fn) had_error = 1; continue; } - if (!resolve_ref(ref, sha1, 1, NULL)) { + if (read_ref(ref, sha1)) { error("replace ref '%s' not found.", *p); had_error = 1; continue; @@ -97,7 +97,7 @@ static int replace_object(const char *object_ref, const char *replace_ref, if (check_refname_format(ref, 0)) die("'%s' is not a valid ref name.", ref); - if (!resolve_ref(ref, prev, 1, NULL)) + if (read_ref(ref, prev)) hashclr(prev); else if (!force) die("replace ref '%s' already exists", ref); diff --git a/builtin/show-ref.c b/builtin/show-ref.c index fafb6dd50..391166190 100644 --- a/builtin/show-ref.c +++ b/builtin/show-ref.c @@ -225,7 +225,7 @@ int cmd_show_ref(int argc, const char **argv, const char *prefix) unsigned char sha1[20]; if (!prefixcmp(*pattern, "refs/") && - resolve_ref(*pattern, sha1, 1, NULL)) { + !read_ref(*pattern, sha1)) { if (!quiet) show_one(*pattern, sha1); } diff --git a/builtin/tag.c b/builtin/tag.c index 9b6fd9549..439249d46 100644 --- a/builtin/tag.c +++ b/builtin/tag.c @@ -174,7 +174,7 @@ static int for_each_tag_name(const char **argv, each_tag_name_fn fn) had_error = 1; continue; } - if (!resolve_ref(ref, sha1, 1, NULL)) { + if (read_ref(ref, sha1)) { error(_("tag '%s' not found."), *p); had_error = 1; continue; @@ -518,7 +518,7 @@ int cmd_tag(int argc, const char **argv, const char *prefix) if (strbuf_check_tag_ref(&ref, tag)) die(_("'%s' is not a valid tag name."), tag); - if (!resolve_ref(ref.buf, prev, 1, NULL)) + if (read_ref(ref.buf, prev)) hashclr(prev); else if (!force) die(_("tag '%s' already exists"), tag); diff --git a/bundle.c b/bundle.c index 08020bc3a..4742f2734 100644 --- a/bundle.c +++ b/bundle.c @@ -320,7 +320,7 @@ int create_bundle(struct bundle_header *header, const char *path, continue; if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1) continue; - if (!resolve_ref(e->name, sha1, 1, &flag)) + if (read_ref_full(e->name, sha1, 1, &flag)) flag = 0; display_ref = (flag & REF_ISSYMREF) ? e->name : ref; diff --git a/cache.h b/cache.h index 2e6ad3604..5badece71 100644 --- a/cache.h +++ b/cache.h @@ -832,6 +832,8 @@ static inline int get_sha1_with_context(const char *str, unsigned char *sha1, st extern int get_sha1_hex(const char *hex, unsigned char *sha1); extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */ +extern int read_ref_full(const char *filename, unsigned char *sha1, + int reading, int *flags); extern int read_ref(const char *filename, unsigned char *sha1); /* diff --git a/notes-merge.c b/notes-merge.c index e9e419931..e33c2c9f1 100644 --- a/notes-merge.c +++ b/notes-merge.c @@ -568,7 +568,7 @@ int notes_merge(struct notes_merge_options *o, o->local_ref, o->remote_ref); /* Dereference o->local_ref into local_sha1 */ - if (!resolve_ref(o->local_ref, local_sha1, 0, NULL)) + if (read_ref_full(o->local_ref, local_sha1, 0, NULL)) die("Failed to resolve local notes ref '%s'", o->local_ref); else if (!check_refname_format(o->local_ref, 0) && is_null_sha1(local_sha1)) diff --git a/refs.c b/refs.c index e69ba26b7..44c1c86e1 100644 --- a/refs.c +++ b/refs.c @@ -334,7 +334,7 @@ static void get_ref_dir(const char *submodule, const char *base, flag |= REF_ISBROKEN; } } else - if (!resolve_ref(ref, sha1, 1, &flag)) { + if (read_ref_full(ref, sha1, 1, &flag)) { hashclr(sha1); flag |= REF_ISBROKEN; } @@ -612,13 +612,18 @@ struct ref_filter { void *cb_data; }; -int read_ref(const char *ref, unsigned char *sha1) +int read_ref_full(const char *ref, unsigned char *sha1, int reading, int *flags) { - if (resolve_ref(ref, sha1, 1, NULL)) + if (resolve_ref(ref, sha1, reading, flags)) return 0; return -1; } +int read_ref(const char *ref, unsigned char *sha1) +{ + return read_ref_full(ref, sha1, 1, NULL); +} + #define DO_FOR_EACH_INCLUDE_BROKEN 01 static int do_one_ref(const char *base, each_ref_fn fn, int trim, int flags, void *cb_data, struct ref_entry *entry) @@ -663,7 +668,7 @@ int peel_ref(const char *ref, unsigned char *sha1) goto fallback; } - if (!resolve_ref(ref, base, 1, &flag)) + if (read_ref_full(ref, base, 1, &flag)) return -1; if ((flag & REF_ISPACKED)) { @@ -746,7 +751,7 @@ static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data) return 0; } - if (resolve_ref("HEAD", sha1, 1, &flag)) + if (!read_ref_full("HEAD", sha1, 1, &flag)) return fn("HEAD", sha1, flag, cb_data); return 0; @@ -826,7 +831,7 @@ int head_ref_namespaced(each_ref_fn fn, void *cb_data) int flag; strbuf_addf(&buf, "%sHEAD", get_git_namespace()); - if (resolve_ref(buf.buf, sha1, 1, &flag)) + if (!read_ref_full(buf.buf, sha1, 1, &flag)) ret = fn(buf.buf, sha1, flag, cb_data); strbuf_release(&buf); @@ -1022,7 +1027,7 @@ int refname_match(const char *abbrev_name, const char *full_name, const char **r static struct ref_lock *verify_lock(struct ref_lock *lock, const unsigned char *old_sha1, int mustexist) { - if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) { + if (read_ref_full(lock->ref_name, lock->old_sha1, mustexist, NULL)) { error("Can't verify ref %s", lock->ref_name); unlock_ref(lock); return NULL; @@ -1377,7 +1382,8 @@ int rename_ref(const char *oldref, const char *newref, const char *logmsg) goto rollback; } - if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1, REF_NODEREF)) { + if (!read_ref_full(newref, sha1, 1, &flag) && + delete_ref(newref, sha1, REF_NODEREF)) { if (errno==EISDIR) { if (remove_empty_directories(git_path("%s", newref))) { error("Directory not empty: %s", newref); @@ -1929,7 +1935,7 @@ static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data) retval = do_for_each_reflog(log, fn, cb_data); } else { unsigned char sha1[20]; - if (!resolve_ref(log, sha1, 0, NULL)) + if (read_ref_full(log, sha1, 0, NULL)) retval = error("bad ref for %s", log); else retval = fn(log, sha1, 0, cb_data); @@ -2072,7 +2078,6 @@ char *shorten_unambiguous_ref(const char *ref, int strict) */ for (j = 0; j < rules_to_fail; j++) { const char *rule = ref_rev_parse_rules[j]; - unsigned char short_objectname[20]; char refname[PATH_MAX]; /* skip matched rule */ @@ -2086,7 +2091,7 @@ char *shorten_unambiguous_ref(const char *ref, int strict) */ mksnpath(refname, sizeof(refname), rule, short_name_len, short_name); - if (!read_ref(refname, short_objectname)) + if (ref_exists(refname)) break; } diff --git a/remote.c b/remote.c index e2ef99114..6655bb05b 100644 --- a/remote.c +++ b/remote.c @@ -1507,13 +1507,13 @@ int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs) * nothing to report. */ base = branch->merge[0]->dst; - if (!resolve_ref(base, sha1, 1, NULL)) + if (read_ref(base, sha1)) return 0; theirs = lookup_commit_reference(sha1); if (!theirs) return 0; - if (!resolve_ref(branch->refname, sha1, 1, NULL)) + if (read_ref(branch->refname, sha1)) return 0; ours = lookup_commit_reference(sha1); if (!ours)