$ git clone -n https://src.fedoraproject.org/rpms/git-time-metric.git /var/lib/mock/f38-build-side-42-init-devel-568193-25905/root/chroot_tmpdir/scmroot/git-time-metric
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-568193-25905/root/chroot_tmpdir/scmroot/git-time-metric'...
$ git fetch origin 148dd9075d7da6cbccb45706756eee4f72450a4e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/git-time-metric
 * [new ref]         148dd9075d7da6cbccb45706756eee4f72450a4e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 148dd90 Rebuild for libgit2 1.5.x