$ git clone -n https://src.fedoraproject.org/rpms/unicorn.git /var/lib/mock/f38-build-side-42-init-devel-1339871-30694/root/chroot_tmpdir/scmroot/unicorn
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1339871-30694/root/chroot_tmpdir/scmroot/unicorn'...
$ git fetch origin d2f7b5a63c4bcdf98f99d275b36dc3d969393386:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/unicorn
 * [new ref]         d2f7b5a63c4bcdf98f99d275b36dc3d969393386 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d2f7b5a Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild