$ git clone -n https://src.fedoraproject.org/rpms/calendarsupport.git /var/lib/mock/f42-build-864305-172280/root/chroot_tmpdir/scmroot/calendarsupport
Cloning into '/var/lib/mock/f42-build-864305-172280/root/chroot_tmpdir/scmroot/calendarsupport'...
$ git fetch origin b27685920d76e93ac3fee9ecc78c26bab436114d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/calendarsupport
 * [new ref]         b27685920d76e93ac3fee9ecc78c26bab436114d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b276859 24.12.0