Change xdl_merge to generate output even for null merges

diff --git a/index-pack.c b/index-pack.c
index 530d820370fb2b02a443873b8b9ddd0bcffcb5ec..c99a1a152c7ddbb63073461b86179f2be5bf9640 100644 (file)
--- a/index-pack.c
+++ b/index-pack.c
@@ -365,8 +365,11 @@ static void *get_data_from_pack(struct object_entry *obj)
        data = src;
        do {
                ssize_t n = pread(pack_fd, data + rdy, len - rdy, from + rdy);
-               if (n <= 0)
+               if (n < 0)
                        die("cannot pread pack file: %s", strerror(errno));
+               if (!n)
+                       die("premature end of pack file, %lu bytes missing",
+                           len - rdy);
                rdy += n;
        } while (rdy < len);
        data = xmalloc(obj->size);
@@ -704,6 +707,7 @@ static struct object_entry *append_obj_to_pack(struct sha1file *f,
        obj[1].idx.offset = obj[0].idx.offset + n;
        obj[1].idx.offset += write_compressed(f, buf, size);
        obj[0].idx.crc32 = crc32_end(f);
+       sha1flush(f);
        hashcpy(obj->idx.sha1, sha1);
        return obj;
 }
@@ -875,10 +879,26 @@ int main(int argc, char **argv)
        char *index_name_buf = NULL, *keep_name_buf = NULL;
        struct pack_idx_entry **idx_objects;
        unsigned char pack_sha1[20];
-       int nongit = 0;
 
-       setup_git_directory_gently(&nongit);
-       git_config(git_index_pack_config, NULL);
+       /*
+        * We wish to read the repository's config file if any, and
+        * for that it is necessary to call setup_git_directory_gently().
+        * However if the cwd was inside .git/objects/pack/ then we need
+        * to go back there or all the pack name arguments will be wrong.
+        * And in that case we cannot rely on any prefix returned by
+        * setup_git_directory_gently() either.
+        */
+       {
+               char cwd[PATH_MAX+1];
+               int nongit;
+
+               if (!getcwd(cwd, sizeof(cwd)-1))
+                       die("Unable to get current working directory");
+               setup_git_directory_gently(&nongit);
+               git_config(git_index_pack_config, NULL);
+               if (chdir(cwd))
+                       die("Cannot come back to cwd");
+       }
 
        for (i = 1; i < argc; i++) {
                char *arg = argv[i];