$ git clone -n https://src.fedoraproject.org/rpms/credentials-fetcher.git /var/lib/mock/f38-build-side-42-init-devel-1282390-30671/root/chroot_tmpdir/scmroot/credentials-fetcher
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1282390-30671/root/chroot_tmpdir/scmroot/credentials-fetcher'...
$ git fetch origin 30c808ced6c6d162c931aef66bafcbef12ae26e1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/credentials-fetcher
 * [new ref]         30c808ced6c6d162c931aef66bafcbef12ae26e1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 30c808c Update include arch