server_supports(): parse feature list more carefully

We have been carefully choosing feature names used in the protocol
extensions so that the vocabulary does not contain a word that is a
substring of another word, so it is not a real problem, but we have
recently added "quiet" feature word, which would mean we cannot later
add some other word with "quiet" (e.g. "quiet-push"), which is awkward.

Let's make sure that we can eventually be able to do so by teaching the
clients and servers that feature words consist of non whitespace
letters. This parser also allows us to later add features with parameters
e.g. "feature=1.5" (parameter values need to be quoted for whitespaces,
but we will worry about the detauls when we do introduce them).

Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Clemens Buchacher <drizzd@aon.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index d2dcb7e4af259a43a539f83ab5961472c594c99a..d8ddcaa0c90c0d2e847f7aeb4f878dd050ac272b 100644 (file)
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -731,9 +731,10 @@ static struct command *read_head_info(void)
                refname = line + 82;
                reflen = strlen(refname);
                if (reflen + 82 < len) {
-                       if (strstr(refname + reflen + 1, "report-status"))
+                       const char *feature_list = refname + reflen + 1;
+                       if (parse_feature_request(feature_list, "report-status"))
                                report_status = 1;
-                       if (strstr(refname + reflen + 1, "side-band-64k"))
+                       if (parse_feature_request(feature_list, "side-band-64k"))
                                use_sideband = LARGE_PACKET_MAX;
                }
                cmd = xcalloc(1, sizeof(struct command) + len - 80);

diff --git a/cache.h b/cache.h
index 10afd71d435920a3cc2152208a06058791ea7a04..9bd8c2d06c80c958b5f654fe16e7294883e49a30 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -1037,6 +1037,7 @@ struct extra_have_objects {
 };
 extern struct ref **get_remote_heads(int in, struct ref **list, unsigned int flags, struct extra_have_objects *);
 extern int server_supports(const char *feature);
+extern const char *parse_feature_request(const char *features, const char *feature);
 
 extern struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path);
 

diff --git a/connect.c b/connect.c
index 2ea5c3c0fbedb89e4189d32a455f289398ce106b..912cddeea8c4f09ec523ce19e677358c84eda9b7 100644 (file)
--- a/connect.c
+++ b/connect.c
@@ -101,8 +101,27 @@ struct ref **get_remote_heads(int in, struct ref **list,
 
 int server_supports(const char *feature)
 {
-       return server_capabilities &&
-               strstr(server_capabilities, feature) != NULL;
+       return !!parse_feature_request(server_capabilities, feature);
+}
+
+const char *parse_feature_request(const char *feature_list, const char *feature)
+{
+       int len;
+
+       if (!feature_list)
+               return NULL;
+
+       len = strlen(feature);
+       while (*feature_list) {
+               const char *found = strstr(feature_list, feature);
+               if (!found)
+                       return NULL;
+               if ((feature_list == found || isspace(found[-1])) &&
+                   (!found[len] || isspace(found[len]) || found[len] == '='))
+                       return found;
+               feature_list = found + 1;
+       }
+       return NULL;
 }
 
 enum protocol {

diff --git a/upload-pack.c b/upload-pack.c
index 6f36f6255c3f4e3db4cdc7ca9b9dcca56846c72d..0d11e21a68b227101d6c7f6f4d7b305d08f77d95 100644 (file)
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -585,6 +585,7 @@ static void receive_needs(void)
                write_str_in_full(debug_fd, "#S\n");
        for (;;) {
                struct object *o;
+               const char *features;
                unsigned char sha1_buf[20];
                len = packet_read_line(0, line, sizeof(line));
                reset_timeout();
@@ -616,23 +617,26 @@ static void receive_needs(void)
                    get_sha1_hex(line+5, sha1_buf))
                        die("git upload-pack: protocol error, "
                            "expected to get sha, not '%s'", line);
-               if (strstr(line+45, "multi_ack_detailed"))
+
+               features = line + 45;
+
+               if (parse_feature_request(features, "multi_ack_detailed"))
                        multi_ack = 2;
-               else if (strstr(line+45, "multi_ack"))
+               else if (parse_feature_request(features, "multi_ack"))
                        multi_ack = 1;
-               if (strstr(line+45, "no-done"))
+               if (parse_feature_request(features, "no-done"))
                        no_done = 1;
-               if (strstr(line+45, "thin-pack"))
+               if (parse_feature_request(features, "thin-pack"))
                        use_thin_pack = 1;
-               if (strstr(line+45, "ofs-delta"))
+               if (parse_feature_request(features, "ofs-delta"))
                        use_ofs_delta = 1;
-               if (strstr(line+45, "side-band-64k"))
+               if (parse_feature_request(features, "side-band-64k"))
                        use_sideband = LARGE_PACKET_MAX;
-               else if (strstr(line+45, "side-band"))
+               else if (parse_feature_request(features, "side-band"))
                        use_sideband = DEFAULT_PACKET_MAX;
-               if (strstr(line+45, "no-progress"))
+               if (parse_feature_request(features, "no-progress"))
                        no_progress = 1;
-               if (strstr(line+45, "include-tag"))
+               if (parse_feature_request(features, "include-tag"))
                        use_include_tag = 1;
 
                o = lookup_object(sha1_buf);