$ git clone -n https://src.fedoraproject.org/rpms/rust-clang-ast.git /var/lib/mock/f41-build-733010-13196/root/chroot_tmpdir/scmroot/rust-clang-ast
Cloning into '/var/lib/mock/f41-build-733010-13196/root/chroot_tmpdir/scmroot/rust-clang-ast'...
$ git fetch origin 7b2d1afd07821bcaabaad555ab0f91ddf62d479b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-clang-ast
 * [new ref]         7b2d1afd07821bcaabaad555ab0f91ddf62d479b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b2d1af Update to version 0.1.24 (rhbz#2284215)