setup: introduce the discover_git_directory() function

diff --git a/transport.c b/transport.c
index 04e5d6623e39014622e0a185d37f8a456fd352e6..d72e0894840fc384d67339b549a9a6bce7ba03ec 100644 (file)
--- a/transport.c
+++ b/transport.c
@@ -664,21 +664,89 @@ static const struct string_list *protocol_whitelist(void)
        return enabled ? &allowed : NULL;
 }
 
-int is_transport_allowed(const char *type)
+enum protocol_allow_config {
+       PROTOCOL_ALLOW_NEVER = 0,
+       PROTOCOL_ALLOW_USER_ONLY,
+       PROTOCOL_ALLOW_ALWAYS
+};
+
+static enum protocol_allow_config parse_protocol_config(const char *key,
+                                                       const char *value)
 {
-       const struct string_list *allowed = protocol_whitelist();
-       return !allowed || string_list_has_string(allowed, type);
+       if (!strcasecmp(value, "always"))
+               return PROTOCOL_ALLOW_ALWAYS;
+       else if (!strcasecmp(value, "never"))
+               return PROTOCOL_ALLOW_NEVER;
+       else if (!strcasecmp(value, "user"))
+               return PROTOCOL_ALLOW_USER_ONLY;
+
+       die("unknown value for config '%s': %s", key, value);
 }
 
-void transport_check_allowed(const char *type)
+static enum protocol_allow_config get_protocol_config(const char *type)
 {
-       if (!is_transport_allowed(type))
-               die("transport '%s' not allowed", type);
+       char *key = xstrfmt("protocol.%s.allow", type);
+       char *value;
+
+       /* first check the per-protocol config */
+       if (!git_config_get_string(key, &value)) {
+               enum protocol_allow_config ret =
+                       parse_protocol_config(key, value);
+               free(key);
+               free(value);
+               return ret;
+       }
+       free(key);
+
+       /* if defined, fallback to user-defined default for unknown protocols */
+       if (!git_config_get_string("protocol.allow", &value)) {
+               enum protocol_allow_config ret =
+                       parse_protocol_config("protocol.allow", value);
+               free(value);
+               return ret;
+       }
+
+       /* fallback to built-in defaults */
+       /* known safe */
+       if (!strcmp(type, "http") ||
+           !strcmp(type, "https") ||
+           !strcmp(type, "git") ||
+           !strcmp(type, "ssh") ||
+           !strcmp(type, "file"))
+               return PROTOCOL_ALLOW_ALWAYS;
+
+       /* known scary; err on the side of caution */
+       if (!strcmp(type, "ext"))
+               return PROTOCOL_ALLOW_NEVER;
+
+       /* unknown; by default let them be used only directly by the user */
+       return PROTOCOL_ALLOW_USER_ONLY;
 }
 
-int transport_restrict_protocols(void)
+int is_transport_allowed(const char *type, int from_user)
 {
-       return !!protocol_whitelist();
+       const struct string_list *whitelist = protocol_whitelist();
+       if (whitelist)
+               return string_list_has_string(whitelist, type);
+
+       switch (get_protocol_config(type)) {
+       case PROTOCOL_ALLOW_ALWAYS:
+               return 1;
+       case PROTOCOL_ALLOW_NEVER:
+               return 0;
+       case PROTOCOL_ALLOW_USER_ONLY:
+               if (from_user < 0)
+                       from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
+               return from_user;
+       }
+
+       die("BUG: invalid protocol_allow_config type");
+}
+
+void transport_check_allowed(const char *type)
+{
+       if (!is_transport_allowed(type, -1))
+               die("transport '%s' not allowed", type);
 }
 
 struct transport *transport_get(struct remote *remote, const char *url)
@@ -947,7 +1015,9 @@ int transport_push(struct transport *transport,
                        if (run_pre_push_hook(transport, remote_refs))
                                return -1;
 
-               if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
+               if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
+                             TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
+                   !is_bare_repository()) {
                        struct ref *ref = remote_refs;
                        struct sha1_array commits = SHA1_ARRAY_INIT;
 
@@ -965,7 +1035,8 @@ int transport_push(struct transport *transport,
                }
 
                if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
-                    ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) &&
+                    ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
+                               TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
                      !pretend)) && !is_bare_repository()) {
                        struct ref *ref = remote_refs;
                        struct string_list needs_pushing = STRING_LIST_INIT_DUP;
@@ -984,7 +1055,10 @@ int transport_push(struct transport *transport,
                        sha1_array_clear(&commits);
                }
 
-               push_ret = transport->push_refs(transport, remote_refs, flags);
+               if (!(flags & TRANSPORT_RECURSE_SUBMODULES_ONLY))
+                       push_ret = transport->push_refs(transport, remote_refs, flags);
+               else
+                       push_ret = 0;
                err = push_had_errors(remote_refs);
                ret = push_ret | err;
 
@@ -996,7 +1070,8 @@ int transport_push(struct transport *transport,
                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
                        set_upstreams(transport, remote_refs, pretend);
 
-               if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
+               if (!(flags & (TRANSPORT_PUSH_DRY_RUN |
+                              TRANSPORT_RECURSE_SUBMODULES_ONLY))) {
                        struct ref *ref;
                        for (ref = remote_refs; ref; ref = ref->next)
                                transport_update_tracking_ref(transport->remote, ref, verbose);
@@ -1146,7 +1221,7 @@ static int refs_from_alternate_cb(struct alternate_object_database *e,
        const struct ref *extra;
        struct alternate_refs_data *cb = data;
 
-       other = xstrdup(real_path(e->path));
+       other = real_pathdup(e->path);
        len = strlen(other);
 
        while (other[len-1] == '/')