fetch: use struct ref to represent refs to be fetched

Even though "git fetch" has full infrastructure to parse refspecs to
be fetched and match them against the list of refs to come up with
the final list of refs to be fetched, the list of refs that are
requested to be fetched were internally converted to a plain list of
strings at the transport layer and then passed to the underlying
fetch-pack driver.

Stop this conversion and instead pass around an array of refs.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 32 insertions, 8 deletions

diff --git a/builtin/fetch-pack.c b/builtin/fetch-pack.c
index 940ae35dc2..670e81fd99 100644
--- a/builtin/fetch-pack.c
+++ b/builtin/fetch-pack.c
@@ -7,12 +7,31 @@ static const char fetch_pack_usage[] =
 "[--include-tag] [--upload-pack=<git-upload-pack>] [--depth=<n>] "
 "[--no-progress] [-v] [<host>:]<directory> [<refs>...]";
 
+static void add_sought_entry_mem(struct ref ***sought, int *nr, int *alloc,
+				 const char *name, int namelen)
+{
+	struct ref *ref = xcalloc(1, sizeof(*ref) + namelen + 1);
+
+	memcpy(ref->name, name, namelen);
+	ref->name[namelen] = '\0';
+	(*nr)++;
+	ALLOC_GROW(*sought, *nr, *alloc);
+	(*sought)[*nr - 1] = ref;
+}
+
+static void add_sought_entry(struct ref ***sought, int *nr, int *alloc,
+			     const char *string)
+{
+	add_sought_entry_mem(sought, nr, alloc, string, strlen(string));
+}
+
 int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
 {
 	int i, ret;
 	struct ref *ref = NULL;
 	const char *dest = NULL;
-	struct string_list sought = STRING_LIST_INIT_DUP;
+	struct ref **sought = NULL;
+	int nr_sought = 0, alloc_sought = 0;
 	int fd[2];
 	char *pack_lockfile = NULL;
 	char **pack_lockfile_ptr = NULL;
@@ -94,7 +113,7 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
 	 * refs from the standard input:
 	 */
 	for (; i < argc; i++)
-		string_list_append(&sought, xstrdup(argv[i]));
+		add_sought_entry(&sought, &nr_sought, &alloc_sought, argv[i]);
 	if (args.stdin_refs) {
 		if (args.stateless_rpc) {
 			/* in stateless RPC mode we use pkt-line to read
@@ -107,14 +126,14 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
 					break;
 				if (line[n-1] == '\n')
 					n--;
-				string_list_append(&sought, xmemdupz(line, n));
+				add_sought_entry_mem(&sought, &nr_sought,  &alloc_sought, line, n);
 			}
 		}
 		else {
 			/* read from stdin one ref per line, until EOF */
 			struct strbuf line = STRBUF_INIT;
 			while (strbuf_getline(&line, stdin, '\n') != EOF)
-				string_list_append(&sought, strbuf_detach(&line, NULL));
+				add_sought_entry(&sought, &nr_sought, &alloc_sought, line.buf);
 			strbuf_release(&line);
 		}
 	}
@@ -131,7 +150,7 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
 	get_remote_heads(fd[0], &ref, 0, NULL);
 
 	ref = fetch_pack(&args, fd, conn, ref, dest,
-			 &sought, pack_lockfile_ptr);
+			 sought, nr_sought, pack_lockfile_ptr);
 	if (pack_lockfile) {
 		printf("lock %s\n", pack_lockfile);
 		fflush(stdout);
@@ -141,7 +160,7 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
 	if (finish_connect(conn))
 		return 1;
 
-	ret = !ref || sought.nr;
+	ret = !ref;
 
 	/*
 	 * If the heads to pull were given, we should have consumed
@@ -149,8 +168,13 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
 	 * remote no-such-ref' would silently succeed without issuing
 	 * an error.
 	 */
-	for (i = 0; i < sought.nr; i++)
-		error("no such remote ref %s", sought.items[i].string);
+	for (i = 0; i < nr_sought; i++) {
+		if (!sought[i] || sought[i]->matched)
+			continue;
+		error("no such remote ref %s", sought[i]->name);
+		ret = 1;
+	}
+
 	while (ref) {
 		printf("%s %s\n",
 		       sha1_to_hex(ref->old_sha1), ref->name);