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-rw-r--r--builtin-tar-tree.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/builtin-tar-tree.c b/builtin-tar-tree.c
index 7663b9bd8e..58a8ccd4d6 100644
--- a/builtin-tar-tree.c
+++ b/builtin-tar-tree.c
@@ -402,3 +402,28 @@ int cmd_tar_tree(int argc, const char **argv, char **envp)
return remote_tar(argc, argv);
return generate_tar(argc, argv, envp);
}
+
+/* ustar header + extended global header content */
+#define HEADERSIZE (2 * RECORDSIZE)
+
+int cmd_get_tar_commit_id(int argc, const char **argv, char **envp)
+{
+ char buffer[HEADERSIZE];
+ struct ustar_header *header = (struct ustar_header *)buffer;
+ char *content = buffer + RECORDSIZE;
+ ssize_t n;
+
+ n = xread(0, buffer, HEADERSIZE);
+ if (n < HEADERSIZE)
+ die("git-get-tar-commit-id: read error");
+ if (header->typeflag[0] != 'g')
+ return 1;
+ if (memcmp(content, "52 comment=", 11))
+ return 1;
+
+ n = xwrite(1, content + 11, 41);
+ if (n < 41)
+ die("git-get-tar-commit-id: write error");
+
+ return 0;
+}