patchPull refs by HTTP

Index: http-pull.c
===================================================================
--- b6a510708036fe29a19c33472f5c0b746e2d26d7/http-pull.c  (mode:100644 sha1:f49525c00228b5db9dc2fbd4860883887bb7dbad)
+++ bc8b6802c7004e93b812698bd699c3548906653b/http-pull.c  (mode:100644 sha1:ec53dad8efbe6e7734b75eaba8821ac290a5abbb)
@@ -16,6 +16,23 @@
 static int local;
 static int zret;
 
+struct buffer
+{
+        size_t posn;
+        size_t size;
+        void *buffer;
+};
+
+static size_t fwrite_buffer(void *ptr, size_t eltsize, size_t nmemb,
+                            struct buffer *buffer) {
+        size_t size = eltsize * nmemb;
+        if (size > buffer->size - buffer->posn)
+                size = buffer->size - buffer->posn;
+        memcpy(buffer->buffer + buffer->posn, ptr, size);
+        buffer->posn += size;
+        return size;
+}
+
 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb, 
 			       void *data) {
 	unsigned char expn[4096];
@@ -94,7 +111,32 @@
 
 int fetch_ref(char *ref, unsigned char *sha1)
 {
-	return -1;
+        char *url, *posn;
+        char hex[42];
+        struct buffer buffer;
+        buffer.size = 41;
+        buffer.posn = 0;
+        buffer.buffer = hex;
+        hex[41] = '\0';
+        
+        curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
+        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
+
+        url = xmalloc(strlen(base) + 6 + strlen(ref));
+        strcpy(url, base);
+        posn = url + strlen(base);
+        strcpy(posn, "refs/");
+        posn += 5;
+        strcpy(posn, ref);
+
+        curl_easy_setopt(curl, CURLOPT_URL, url);
+
+        if (curl_easy_perform(curl))
+                return error("Couldn't get %s for %s\n", url, ref);
+
+        hex[40] = '\0';
+        get_sha1_hex(hex, sha1);
+        return 0;
 }
 
 int main(int argc, char **argv)
@@ -118,11 +160,14 @@
 			get_history = 1;
 		} else if (argv[arg][1] == 'v') {
 			get_verbosely = 1;
+		} else if (argv[arg][1] == 'w') {
+			write_ref = argv[arg + 1];
+			arg++;
 		}
 		arg++;
 	}
 	if (argc < arg + 2) {
-		usage("git-http-pull [-c] [-t] [-a] [-d] [-v] [--recover] commit-id url");
+		usage("git-http-pull [-c] [-t] [-a] [-d] [-v] [--recover] [-w ref] commit-id url");
 		return 1;
 	}
 	commit_id = argv[arg];

Documentation/git-local-pull.txt, local-pull.c

diff --git a/Documentation/git-local-pull.txt b/Documentation/git-local-pull.txt
--- a/Documentation/git-local-pull.txt
+++ b/Documentation/git-local-pull.txt
@@ -9,7 +9,7 @@ git-local-pull - Duplicates another GIT 
 
 SYNOPSIS
 --------
-'git-local-pull' [-c] [-t] [-a] [-l] [-s] [-n] [-v] [-d] [--recover] commit-id path
+'git-local-pull' [-c] [-t] [-a] [-d] [-v] [-w filename] [--recover] [-l] [-s] [-n] commit-id path
 
 DESCRIPTION
 -----------
@@ -32,10 +32,13 @@ OPTIONS
 	usual, to recover after earlier pull that was interrupted.
 -v::
 	Report what is downloaded.
+-w::
+        Writes the commit-id into the filename under $GIT_DIR/refs/ on
+        the local end after the transfer is complete.
 
 Author
 ------
-Written by Linus Torvalds <torvalds@osdl.org>
+Written by Junio C Hamano <junkio@cox.net>
 
 Documentation
 --------------
diff --git a/local-pull.c b/local-pull.c
--- a/local-pull.c
+++ b/local-pull.c
@@ -9,7 +9,7 @@ static int use_link = 0;
 static int use_symlink = 0;
 static int use_filecopy = 1;
 
-static char *path;
+static char *path; /* "Remote" git repository */
 
 int fetch(unsigned char *sha1)
 {
@@ -75,11 +75,34 @@ int fetch(unsigned char *sha1)
 
 int fetch_ref(char *ref, unsigned char *sha1)
 {
-	return -1;
+	static int ref_name_start = -1;
+	static char filename[PATH_MAX];
+	static char hex[41];
+	int ifd;
+
+	if (ref_name_start < 0) {
+		sprintf(filename, "%s/refs/", path);
+		ref_name_start = strlen(filename);
+	}
+	strcpy(filename + ref_name_start, ref);
+	ifd = open(filename, O_RDONLY);
+	if (ifd < 0) {
+		close(ifd);
+		fprintf(stderr, "cannot open %s\n", filename);
+		return -1;
+	}
+	if (read(ifd, hex, 40) != 40 || get_sha1_hex(hex, sha1)) {
+		close(ifd);
+		fprintf(stderr, "cannot read from %s\n", filename);
+		return -1;
+	}
+	close(ifd);
+	pull_say("ref %s\n", sha1_to_hex(sha1));
+	return 0;
 }
 
 static const char *local_pull_usage = 
-"git-local-pull [-c] [-t] [-a] [-l] [-s] [-n] [-v] [-d] [--recover] commit-id path";
+"git-local-pull [-c] [-t] [-a] [-d] [-v] [-w filename] [--recover] [-l] [-s] [-n] commit-id path";
 
 /* 
  * By default we only use file copy.
@@ -114,6 +137,8 @@ int main(int argc, char **argv)
 			use_filecopy = 0;
 		else if (argv[arg][1] == 'v')
 			get_verbosely = 1;
+		else if (argv[arg][1] == 'w')
+			write_ref = argv[++arg];
 		else
 			usage(local_pull_usage);
 		arg++;
------------------------------------------------