Rename resolve_ref() to resolve_ref_unsafe()

resolve_ref() may return a pointer to a shared buffer and can be
overwritten by the next resolve_ref() calls. Callers need to
pay attention, not to keep the pointer when the next call happens.

Rename with "_unsafe" suffix to warn developers (or reviewers) before
introducing new call sites.

This patch is generated using the following command

git grep -l 'resolve_ref(' -- '*.[ch]'|xargs sed -i 's/resolve_ref(/resolve_ref_unsafe(/g'

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/branch.c b/branch.c
index d91a099..772a4c2 100644 (file)
--- a/branch.c
+++ b/branch.c
@@ -182,7 +182,7 @@ int validate_new_branchname(const char *name, struct strbuf *ref,
                const char *head;
                unsigned char sha1[20];
 
-               head = resolve_ref("HEAD", sha1, 0, NULL);
+               head = resolve_ref_unsafe("HEAD", sha1, 0, NULL);
                if (!is_bare_repository() && head && !strcmp(head, ref->buf))
                        die("Cannot force update the current branch.");
        }

diff --git a/builtin/branch.c b/builtin/branch.c
index c459f0b..642b5bd 100644 (file)
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -252,7 +252,7 @@ static char *resolve_symref(const char *src, const char *prefix)
        int flag;
        const char *dst, *cp;
 
-       dst = resolve_ref(src, sha1, 0, &flag);
+       dst = resolve_ref_unsafe(src, sha1, 0, &flag);
        if (!(dst && (flag & REF_ISSYMREF)))
                return NULL;
        if (prefix && (cp = skip_prefix(dst, prefix)))

diff --git a/builtin/commit.c b/builtin/commit.c
index e36e9ad..4d39d25 100644 (file)
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -1304,7 +1304,7 @@ static void print_summary(const char *prefix, const unsigned char *sha1,
        rev.diffopt.break_opt = 0;
        diff_setup_done(&rev.diffopt);
 
-       head = resolve_ref("HEAD", junk_sha1, 0, NULL);
+       head = resolve_ref_unsafe("HEAD", junk_sha1, 0, NULL);
        printf("[%s%s ",
                !prefixcmp(head, "refs/heads/") ?
                        head + 11 :

diff --git a/builtin/fsck.c b/builtin/fsck.c
index 30d0dc8..8c479a7 100644 (file)
--- a/builtin/fsck.c
+++ b/builtin/fsck.c
@@ -563,7 +563,7 @@ static int fsck_head_link(void)
        if (verbose)
                fprintf(stderr, "Checking HEAD link\n");
 
-       head_points_at = resolve_ref("HEAD", head_sha1, 0, &flag);
+       head_points_at = resolve_ref_unsafe("HEAD", head_sha1, 0, &flag);
        if (!head_points_at)
                return error("Invalid HEAD");
        if (!strcmp(head_points_at, "HEAD"))

diff --git a/builtin/log.c b/builtin/log.c
index 4395f3e..89d0cc0 100644 (file)
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -1040,7 +1040,7 @@ static char *find_branch_name(struct rev_info *rev)
        if (positive < 0)
                return NULL;
        strbuf_addf(&buf, "refs/heads/%s", rev->cmdline.rev[positive].name);
-       branch = resolve_ref(buf.buf, branch_sha1, 1, NULL);
+       branch = resolve_ref_unsafe(buf.buf, branch_sha1, 1, NULL);
        if (!branch ||
            prefixcmp(branch, "refs/heads/") ||
            hashcmp(rev->cmdline.rev[positive].item->sha1, branch_sha1))
@@ -1268,7 +1268,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 
                        rev.pending.objects[0].item->flags |= UNINTERESTING;
                        add_head_to_pending(&rev);
-                       ref = resolve_ref("HEAD", sha1, 1, NULL);
+                       ref = resolve_ref_unsafe("HEAD", sha1, 1, NULL);
                        if (ref && !prefixcmp(ref, "refs/heads/"))
                                branch_name = xstrdup(ref + strlen("refs/heads/"));
                        else

diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index 62afac3..d2dcb7e 100644 (file)
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -572,7 +572,7 @@ static void check_aliased_update(struct command *cmd, struct string_list *list)
        int flag;
 
        strbuf_addf(&buf, "%s%s", get_git_namespace(), cmd->ref_name);
-       dst_name = resolve_ref(buf.buf, sha1, 0, &flag);
+       dst_name = resolve_ref_unsafe(buf.buf, sha1, 0, &flag);
        strbuf_release(&buf);
 
        if (!(flag & REF_ISSYMREF))

diff --git a/builtin/remote.c b/builtin/remote.c
index 407abfb..583eec9 100644 (file)
--- a/builtin/remote.c
+++ b/builtin/remote.c
@@ -573,7 +573,7 @@ static int read_remote_branches(const char *refname,
        strbuf_addf(&buf, "refs/remotes/%s/", rename->old);
        if (!prefixcmp(refname, buf.buf)) {
                item = string_list_append(rename->remote_branches, xstrdup(refname));
-               symref = resolve_ref(refname, orig_sha1, 1, &flag);
+               symref = resolve_ref_unsafe(refname, orig_sha1, 1, &flag);
                if (flag & REF_ISSYMREF)
                        item->util = xstrdup(symref);
                else

diff --git a/builtin/show-branch.c b/builtin/show-branch.c
index a1f148e..a59e088 100644 (file)
--- a/builtin/show-branch.c
+++ b/builtin/show-branch.c
@@ -789,7 +789,7 @@ int cmd_show_branch(int ac, const char **av, const char *prefix)
                }
        }
 
-       head_p = resolve_ref("HEAD", head_sha1, 1, NULL);
+       head_p = resolve_ref_unsafe("HEAD", head_sha1, 1, NULL);
        if (head_p) {
                head_len = strlen(head_p);
                memcpy(head, head_p, head_len + 1);

diff --git a/builtin/symbolic-ref.c b/builtin/symbolic-ref.c
index dea849c..2ef5962 100644 (file)
--- a/builtin/symbolic-ref.c
+++ b/builtin/symbolic-ref.c
@@ -12,7 +12,7 @@ static void check_symref(const char *HEAD, int quiet)
 {
        unsigned char sha1[20];
        int flag;
-       const char *refs_heads_master = resolve_ref(HEAD, sha1, 0, &flag);
+       const char *refs_heads_master = resolve_ref_unsafe(HEAD, sha1, 0, &flag);
 
        if (!refs_heads_master)
                die("No such ref: %s", HEAD);

diff --git a/cache.h b/cache.h
index 4887a3e..e6436e0 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -865,7 +865,7 @@ extern int read_ref(const char *filename, unsigned char *sha1);
  *
  * errno is sometimes set on errors, but not always.
  */
-extern const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag);
+extern const char *resolve_ref_unsafe(const char *ref, unsigned char *sha1, int reading, int *flag);
 extern char *resolve_refdup(const char *ref, unsigned char *sha1, int reading, int *flag);
 
 extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);

diff --git a/refs.c b/refs.c
index 8ffb32f..4bf45b1 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -361,7 +361,7 @@ static int warn_if_dangling_symref(const char *refname, const unsigned char *sha
        if (!(flags & REF_ISSYMREF))
                return 0;
 
-       resolves_to = resolve_ref(refname, junk, 0, NULL);
+       resolves_to = resolve_ref_unsafe(refname, junk, 0, NULL);
        if (!resolves_to || strcmp(resolves_to, d->refname))
                return 0;
 
@@ -497,7 +497,7 @@ static int get_packed_ref(const char *ref, unsigned char *sha1)
        return -1;
 }
 
-const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag)
+const char *resolve_ref_unsafe(const char *ref, unsigned char *sha1, int reading, int *flag)
 {
        int depth = MAXDEPTH;
        ssize_t len;
@@ -607,7 +607,7 @@ const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *
 
 char *resolve_refdup(const char *ref, unsigned char *sha1, int reading, int *flag)
 {
-       const char *ret = resolve_ref(ref, sha1, reading, flag);
+       const char *ret = resolve_ref_unsafe(ref, sha1, reading, flag);
        return ret ? xstrdup(ret) : NULL;
 }
 
@@ -620,7 +620,7 @@ struct ref_filter {
 
 int read_ref_full(const char *ref, unsigned char *sha1, int reading, int *flags)
 {
-       if (resolve_ref(ref, sha1, reading, flags))
+       if (resolve_ref_unsafe(ref, sha1, reading, flags))
                return 0;
        return -1;
 }
@@ -1117,7 +1117,7 @@ int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
 
                this_result = refs_found ? sha1_from_ref : sha1;
                mksnpath(fullref, sizeof(fullref), *p, len, str);
-               r = resolve_ref(fullref, this_result, 1, &flag);
+               r = resolve_ref_unsafe(fullref, this_result, 1, &flag);
                if (r) {
                        if (!refs_found++)
                                *ref = xstrdup(r);
@@ -1147,7 +1147,7 @@ int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
                const char *ref, *it;
 
                mksnpath(path, sizeof(path), *p, len, str);
-               ref = resolve_ref(path, hash, 1, NULL);
+               ref = resolve_ref_unsafe(path, hash, 1, NULL);
                if (!ref)
                        continue;
                if (!stat(git_path("logs/%s", path), &st) &&
@@ -1183,7 +1183,7 @@ static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char
        lock = xcalloc(1, sizeof(struct ref_lock));
        lock->lock_fd = -1;
 
-       ref = resolve_ref(ref, lock->old_sha1, mustexist, &type);
+       ref = resolve_ref_unsafe(ref, lock->old_sha1, mustexist, &type);
        if (!ref && errno == EISDIR) {
                /* we are trying to lock foo but we used to
                 * have foo/bar which now does not exist;
@@ -1196,7 +1196,7 @@ static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char
                        error("there are still refs under '%s'", orig_ref);
                        goto error_return;
                }
-               ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type);
+               ref = resolve_ref_unsafe(orig_ref, lock->old_sha1, mustexist, &type);
        }
        if (type_p)
            *type_p = type;
@@ -1359,7 +1359,7 @@ int rename_ref(const char *oldref, const char *newref, const char *logmsg)
        if (log && S_ISLNK(loginfo.st_mode))
                return error("reflog for %s is a symlink", oldref);
 
-       symref = resolve_ref(oldref, orig_sha1, 1, &flag);
+       symref = resolve_ref_unsafe(oldref, orig_sha1, 1, &flag);
        if (flag & REF_ISSYMREF)
                return error("refname %s is a symbolic ref, renaming it is not supported",
                        oldref);
@@ -1648,7 +1648,7 @@ int write_ref_sha1(struct ref_lock *lock,
                unsigned char head_sha1[20];
                int head_flag;
                const char *head_ref;
-               head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag);
+               head_ref = resolve_ref_unsafe("HEAD", head_sha1, 1, &head_flag);
                if (head_ref && (head_flag & REF_ISSYMREF) &&
                    !strcmp(head_ref, lock->ref_name))
                        log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
@@ -1985,7 +1985,7 @@ int update_ref(const char *action, const char *refname,
 int ref_exists(const char *refname)
 {
        unsigned char sha1[20];
-       return !!resolve_ref(refname, sha1, 1, NULL);
+       return !!resolve_ref_unsafe(refname, sha1, 1, NULL);
 }
 
 struct ref *find_ref_by_name(const struct ref *list, const char *name)

diff --git a/remote.c b/remote.c
index 6655bb0..73a3809 100644 (file)
--- a/remote.c
+++ b/remote.c
@@ -482,7 +482,7 @@ static void read_config(void)
                return;
        default_remote_name = xstrdup("origin");
        current_branch = NULL;
-       head_ref = resolve_ref("HEAD", sha1, 0, &flag);
+       head_ref = resolve_ref_unsafe("HEAD", sha1, 0, &flag);
        if (head_ref && (flag & REF_ISSYMREF) &&
            !prefixcmp(head_ref, "refs/heads/")) {
                current_branch =
@@ -1007,7 +1007,7 @@ static char *guess_ref(const char *name, struct ref *peer)
        struct strbuf buf = STRBUF_INIT;
        unsigned char sha1[20];
 
-       const char *r = resolve_ref(peer->name, sha1, 1, NULL);
+       const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
        if (!r)
                return NULL;
 
@@ -1058,7 +1058,7 @@ static int match_explicit(struct ref *src, struct ref *dst,
                unsigned char sha1[20];
                int flag;
 
-               dst_value = resolve_ref(matched_src->name, sha1, 1, &flag);
+               dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
                if (!dst_value ||
                    ((flag & REF_ISSYMREF) &&
                     prefixcmp(dst_value, "refs/heads/")))

diff --git a/transport.c b/transport.c
index 51814b5..e9797c0 100644 (file)
--- a/transport.c
+++ b/transport.c
@@ -163,7 +163,7 @@ static void set_upstreams(struct transport *transport, struct ref *refs,
                /* Follow symbolic refs (mainly for HEAD). */
                localname = ref->peer_ref->name;
                remotename = ref->name;
-               tmp = resolve_ref(localname, sha, 1, &flag);
+               tmp = resolve_ref_unsafe(localname, sha, 1, &flag);
                if (tmp && flag & REF_ISSYMREF &&
                        !prefixcmp(tmp, "refs/heads/"))
                        localname = tmp;