log_ref_setup(): improve robustness against races

diff --git a/submodule-config.c b/submodule-config.c
index 098085be69b97687b0febfe9e29c6dc0c64569a1..ec13ab5a3dd82ac90c1c83d9e07dc8c045a992d2 100644 (file)
--- a/submodule-config.c
+++ b/submodule-config.c
@@ -263,12 +263,12 @@ int parse_push_recurse_submodules_arg(const char *opt, const char *arg)
        return parse_push_recurse(opt, arg, 1);
 }
 
-static void warn_multiple_config(const unsigned char *commit_sha1,
+static void warn_multiple_config(const unsigned char *treeish_name,
                                 const char *name, const char *option)
 {
        const char *commit_string = "WORKTREE";
-       if (commit_sha1)
-               commit_string = sha1_to_hex(commit_sha1);
+       if (treeish_name)
+               commit_string = sha1_to_hex(treeish_name);
        warning("%s:.gitmodules, multiple configurations found for "
                        "'submodule.%s.%s'. Skipping second one!",
                        commit_string, name, option);
@@ -276,7 +276,7 @@ static void warn_multiple_config(const unsigned char *commit_sha1,
 
 struct parse_config_parameter {
        struct submodule_cache *cache;
-       const unsigned char *commit_sha1;
+       const unsigned char *treeish_name;
        const unsigned char *gitmodules_sha1;
        int overwrite;
 };
@@ -300,7 +300,7 @@ static int parse_config(const char *var, const char *value, void *data)
                if (!value)
                        ret = config_error_nonbool(var);
                else if (!me->overwrite && submodule->path)
-                       warn_multiple_config(me->commit_sha1, submodule->name,
+                       warn_multiple_config(me->treeish_name, submodule->name,
                                        "path");
                else {
                        if (submodule->path)
@@ -314,7 +314,7 @@ static int parse_config(const char *var, const char *value, void *data)
                int die_on_error = is_null_sha1(me->gitmodules_sha1);
                if (!me->overwrite &&
                    submodule->fetch_recurse != RECURSE_SUBMODULES_NONE)
-                       warn_multiple_config(me->commit_sha1, submodule->name,
+                       warn_multiple_config(me->treeish_name, submodule->name,
                                        "fetchrecursesubmodules");
                else
                        submodule->fetch_recurse = parse_fetch_recurse(
@@ -324,7 +324,7 @@ static int parse_config(const char *var, const char *value, void *data)
                if (!value)
                        ret = config_error_nonbool(var);
                else if (!me->overwrite && submodule->ignore)
-                       warn_multiple_config(me->commit_sha1, submodule->name,
+                       warn_multiple_config(me->treeish_name, submodule->name,
                                        "ignore");
                else if (strcmp(value, "untracked") &&
                         strcmp(value, "dirty") &&
@@ -340,7 +340,7 @@ static int parse_config(const char *var, const char *value, void *data)
                if (!value) {
                        ret = config_error_nonbool(var);
                } else if (!me->overwrite && submodule->url) {
-                       warn_multiple_config(me->commit_sha1, submodule->name,
+                       warn_multiple_config(me->treeish_name, submodule->name,
                                        "url");
                } else {
                        free((void *) submodule->url);
@@ -351,21 +351,21 @@ static int parse_config(const char *var, const char *value, void *data)
                        ret = config_error_nonbool(var);
                else if (!me->overwrite &&
                         submodule->update_strategy.type != SM_UPDATE_UNSPECIFIED)
-                       warn_multiple_config(me->commit_sha1, submodule->name,
+                       warn_multiple_config(me->treeish_name, submodule->name,
                                             "update");
                else if (parse_submodule_update_strategy(value,
                         &submodule->update_strategy) < 0)
                                die(_("invalid value for %s"), var);
        } else if (!strcmp(item.buf, "shallow")) {
                if (!me->overwrite && submodule->recommend_shallow != -1)
-                       warn_multiple_config(me->commit_sha1, submodule->name,
+                       warn_multiple_config(me->treeish_name, submodule->name,
                                             "shallow");
                else
                        submodule->recommend_shallow =
                                git_config_bool(var, value);
        } else if (!strcmp(item.buf, "branch")) {
                if (!me->overwrite && submodule->branch)
-                       warn_multiple_config(me->commit_sha1, submodule->name,
+                       warn_multiple_config(me->treeish_name, submodule->name,
                                             "branch");
                else {
                        free((void *)submodule->branch);
@@ -379,18 +379,18 @@ static int parse_config(const char *var, const char *value, void *data)
        return ret;
 }
 
-static int gitmodule_sha1_from_commit(const unsigned char *commit_sha1,
+static int gitmodule_sha1_from_commit(const unsigned char *treeish_name,
                                      unsigned char *gitmodules_sha1,
                                      struct strbuf *rev)
 {
        int ret = 0;
 
-       if (is_null_sha1(commit_sha1)) {
+       if (is_null_sha1(treeish_name)) {
                hashclr(gitmodules_sha1);
                return 1;
        }
 
-       strbuf_addf(rev, "%s:.gitmodules", sha1_to_hex(commit_sha1));
+       strbuf_addf(rev, "%s:.gitmodules", sha1_to_hex(treeish_name));
        if (get_sha1(rev->buf, gitmodules_sha1) >= 0)
                ret = 1;
 
@@ -402,7 +402,7 @@ static int gitmodule_sha1_from_commit(const unsigned char *commit_sha1,
  * revisions.
  */
 static const struct submodule *config_from(struct submodule_cache *cache,
-               const unsigned char *commit_sha1, const char *key,
+               const unsigned char *treeish_name, const char *key,
                enum lookup_type lookup_type)
 {
        struct strbuf rev = STRBUF_INIT;
@@ -418,7 +418,7 @@ static const struct submodule *config_from(struct submodule_cache *cache,
         * return the first submodule. Can be used to check whether
         * there are any submodules parsed.
         */
-       if (!commit_sha1 || !key) {
+       if (!treeish_name || !key) {
                struct hashmap_iter iter;
                struct submodule_entry *entry;
 
@@ -428,7 +428,7 @@ static const struct submodule *config_from(struct submodule_cache *cache,
                return entry->config;
        }
 
-       if (!gitmodule_sha1_from_commit(commit_sha1, sha1, &rev))
+       if (!gitmodule_sha1_from_commit(treeish_name, sha1, &rev))
                goto out;
 
        switch (lookup_type) {
@@ -448,7 +448,7 @@ static const struct submodule *config_from(struct submodule_cache *cache,
 
        /* fill the submodule config into the cache */
        parameter.cache = cache;
-       parameter.commit_sha1 = commit_sha1;
+       parameter.treeish_name = treeish_name;
        parameter.gitmodules_sha1 = sha1;
        parameter.overwrite = 0;
        git_config_from_mem(parse_config, CONFIG_ORIGIN_SUBMODULE_BLOB, rev.buf,
@@ -471,18 +471,6 @@ static const struct submodule *config_from(struct submodule_cache *cache,
        return submodule;
 }
 
-static const struct submodule *config_from_path(struct submodule_cache *cache,
-               const unsigned char *commit_sha1, const char *path)
-{
-       return config_from(cache, commit_sha1, path, lookup_path);
-}
-
-static const struct submodule *config_from_name(struct submodule_cache *cache,
-               const unsigned char *commit_sha1, const char *name)
-{
-       return config_from(cache, commit_sha1, name, lookup_name);
-}
-
 static void ensure_cache_init(void)
 {
        if (is_cache_init)
@@ -496,7 +484,7 @@ int parse_submodule_config_option(const char *var, const char *value)
 {
        struct parse_config_parameter parameter;
        parameter.cache = &the_submodule_cache;
-       parameter.commit_sha1 = NULL;
+       parameter.treeish_name = NULL;
        parameter.gitmodules_sha1 = null_sha1;
        parameter.overwrite = 1;
 
@@ -504,18 +492,18 @@ int parse_submodule_config_option(const char *var, const char *value)
        return parse_config(var, value, &parameter);
 }
 
-const struct submodule *submodule_from_name(const unsigned char *commit_sha1,
+const struct submodule *submodule_from_name(const unsigned char *treeish_name,
                const char *name)
 {
        ensure_cache_init();
-       return config_from_name(&the_submodule_cache, commit_sha1, name);
+       return config_from(&the_submodule_cache, treeish_name, name, lookup_name);
 }
 
-const struct submodule *submodule_from_path(const unsigned char *commit_sha1,
+const struct submodule *submodule_from_path(const unsigned char *treeish_name,
                const char *path)
 {
        ensure_cache_init();
-       return config_from_path(&the_submodule_cache, commit_sha1, path);
+       return config_from(&the_submodule_cache, treeish_name, path, lookup_path);
 }
 
 void submodule_free(void)