Make git-*-pull say who wants them for missing objects.

This patch updates pull.c, the engine that decides which objects are
needed, given a commit to traverse from, to report which commit was
calling for the object that cannot be retrieved from the remote side.
This complements git-fsck-cache in that it checks the consistency of
the remote repository for reachability.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/pull.c b/pull.c
index bbef245..55f17c0 100644 (file)
--- a/pull.c
+++ b/pull.c
@@ -7,12 +7,31 @@
 int get_tree = 0;
 int get_history = 0;
 int get_all = 0;
+static unsigned char current_commit_sha1[20];
 
-static int make_sure_we_have_it(unsigned char *sha1)
+static const char commitS[] = "commit";
+static const char treeS[] = "tree";
+static const char blobS[] = "blob";
+
+static void report_missing(const char *what, const unsigned char *missing)
+{
+       char missing_hex[41];
+
+       strcpy(missing_hex, sha1_to_hex(missing));;
+       fprintf(stderr,
+               "Cannot obtain needed %s %s\nwhile processing commit %s.\n",
+               what, missing_hex, sha1_to_hex(current_commit_sha1));
+}
+
+static int make_sure_we_have_it(const char *what, unsigned char *sha1)
 {
+       int status;
        if (has_sha1_file(sha1))
                return 0;
-       return fetch(sha1);     
+       status = fetch(sha1);
+       if (status && what)
+               report_missing(what, sha1);
+       return status;
 }
 
 static int process_tree(unsigned char *sha1)
@@ -24,7 +43,8 @@ static int process_tree(unsigned char *sha1)
                return -1;
 
        for (entries = tree->entries; entries; entries = entries->next) {
-               if (make_sure_we_have_it(entries->item.tree->object.sha1))
+               const char *what = entries->directory ? treeS : blobS;
+               if (make_sure_we_have_it(what, entries->item.tree->object.sha1))
                        return -1;
                if (entries->directory) {
                        if (process_tree(entries->item.tree->object.sha1))
@@ -38,14 +58,14 @@ static int process_commit(unsigned char *sha1)
 {
        struct commit *obj = lookup_commit(sha1);
 
-       if (make_sure_we_have_it(sha1))
+       if (make_sure_we_have_it(commitS, sha1))
                return -1;
 
        if (parse_commit(obj))
                return -1;
 
        if (get_tree) {
-               if (make_sure_we_have_it(obj->tree->object.sha1))
+               if (make_sure_we_have_it(treeS, obj->tree->object.sha1))
                        return -1;
                if (process_tree(obj->tree->object.sha1))
                        return -1;
@@ -57,7 +77,8 @@ static int process_commit(unsigned char *sha1)
                for (; parents; parents = parents->next) {
                        if (has_sha1_file(parents->item->object.sha1))
                                continue;
-                       if (make_sure_we_have_it(parents->item->object.sha1)) {
+                       if (make_sure_we_have_it(NULL,
+                                                parents->item->object.sha1)) {
                                /* The server might not have it, and
                                 * we don't mind. 
                                 */
@@ -65,6 +86,7 @@ static int process_commit(unsigned char *sha1)
                        }
                        if (process_commit(parents->item->object.sha1))
                                return -1;
+                       memcpy(current_commit_sha1, sha1, 20);
                }
        }
        return 0;
@@ -77,8 +99,9 @@ int pull(char *target)
        retval = get_sha1_hex(target, sha1);
        if (retval)
                return retval;
-       retval = make_sure_we_have_it(sha1);
+       retval = make_sure_we_have_it(commitS, sha1);
        if (retval)
                return retval;
+       memcpy(current_commit_sha1, sha1, 20);
        return process_commit(sha1);
 }