$ git clone -n https://src.fedoraproject.org/rpms/libliftoff.git /var/lib/mock/f39-build-1457851-33019/root/chroot_tmpdir/scmroot/libliftoff
Cloning into '/var/lib/mock/f39-build-1457851-33019/root/chroot_tmpdir/scmroot/libliftoff'...
$ git fetch origin c9ffbbae185c07bd40b5c7501e5463330b8fe094:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libliftoff
 * [new ref]         c9ffbbae185c07bd40b5c7501e5463330b8fe094 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c9ffbba Rebase to version 0.4.1 (Fixes RHBZ#2171929)