[PATCH] Add --info-only option to git-update-cache.

diff --git a/pull.c b/pull.c
index 0bed44f4cbf6716cfc3152f35626123992766408..ed3078e3b27c62c07558fd94f339801cbd685593 100644 (file)
--- a/pull.c
+++ b/pull.c
@@ -3,6 +3,13 @@
 #include "cache.h"
 #include "commit.h"
 #include "tree.h"
+#include "tag.h"
+#include "blob.h"
+#include "refs.h"
+
+const char *write_ref = NULL;
+
+const unsigned char *current_ref = NULL;
 
 int get_tree = 0;
 int get_history = 0;
@@ -31,15 +38,18 @@ static void report_missing(const char *what, const unsigned char *missing)
 
 static int make_sure_we_have_it(const char *what, unsigned char *sha1)
 {
-       int status;
-       if (has_sha1_file(sha1))
-               return 0;
-       status = fetch(sha1);
-       if (status && what)
-               report_missing(what, sha1);
+       int status = 0;
+
+       if (!has_sha1_file(sha1)) {
+               status = fetch(sha1);
+               if (status && what)
+                       report_missing(what, sha1);
+       }
        return status;
 }
 
+static int process_unknown(unsigned char *sha1);
+
 static int process_tree(unsigned char *sha1)
 {
        struct tree *tree = lookup_tree(sha1);
@@ -98,16 +108,71 @@ static int process_commit(unsigned char *sha1)
        return 0;
 }
 
+static int process_tag(unsigned char *sha1)
+{
+       struct tag *obj = lookup_tag(sha1);
+
+       if (parse_tag(obj))
+               return -1;
+       return process_unknown(obj->tagged->sha1);
+}
+
+static int process_unknown(unsigned char *sha1)
+{
+       struct object *obj;
+       if (make_sure_we_have_it("object", sha1))
+               return -1;
+       obj = parse_object(sha1);
+       if (!obj)
+               return error("Unable to parse object %s", sha1_to_hex(sha1));
+       if (obj->type == commit_type)
+               return process_commit(sha1);
+       if (obj->type == tree_type)
+               return process_tree(sha1);
+       if (obj->type == blob_type)
+               return 0;
+       if (obj->type == tag_type)
+               return process_tag(sha1);
+       return error("Unable to determine requirement of type %s for %s",
+                    obj->type, sha1_to_hex(sha1));
+}
+
+static int interpret_target(char *target, unsigned char *sha1)
+{
+       if (!get_sha1_hex(target, sha1))
+               return 0;
+       if (!check_ref_format(target)) {
+               if (!fetch_ref(target, sha1)) {
+                       return 0;
+               }
+       }
+       return -1;
+}
+
+
 int pull(char *target)
 {
-       int retval;
        unsigned char sha1[20];
-       retval = get_sha1_hex(target, sha1);
-       if (retval)
-               return retval;
-       retval = make_sure_we_have_it(commitS, sha1);
-       if (retval)
-               return retval;
-       memcpy(current_commit_sha1, sha1, 20);
-       return process_commit(sha1);
+       int fd = -1;
+
+       if (write_ref && current_ref) {
+               fd = lock_ref_sha1(write_ref, current_ref);
+               if (fd < 0)
+                       return -1;
+       }
+
+       if (interpret_target(target, sha1))
+               return error("Could not interpret %s as something to pull",
+                            target);
+       if (process_unknown(sha1))
+               return -1;
+       
+       if (write_ref) {
+               if (current_ref) {
+                       write_ref_sha1(write_ref, fd, sha1);
+               } else {
+                       write_ref_sha1_unlocked(write_ref, sha1);
+               }
+       }
+       return 0;
 }