$ git clone -n https://src.fedoraproject.org/rpms/ghc-microlens.git /var/lib/mock/f38-build-side-42-init-devel-967506-28808/root/chroot_tmpdir/scmroot/ghc-microlens
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-967506-28808/root/chroot_tmpdir/scmroot/ghc-microlens'...
$ git fetch origin b4c46a653b3cf417a332dcf7cb55b3d204aad320:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-microlens
 * [new ref]         b4c46a653b3cf417a332dcf7cb55b3d204aad320 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b4c46a6 Convert to %autorelease and %autochangelog