$ git clone -n https://src.fedoraproject.org/rpms/kblocks.git /var/lib/mock/f42-build-side-1-3502864-45979/root/chroot_tmpdir/scmroot/kblocks
Cloning into '/var/lib/mock/f42-build-side-1-3502864-45979/root/chroot_tmpdir/scmroot/kblocks'...
$ git fetch origin 95f5e89572934dc73af58e90d34016c408eb1e31:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kblocks
 * [new ref]         95f5e89572934dc73af58e90d34016c408eb1e31 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 95f5e89 25.04.0