$ git clone -n https://src.fedoraproject.org/rpms/lxtask.git /var/lib/mock/f39-build-1460480-33209/root/chroot_tmpdir/scmroot/lxtask
Cloning into '/var/lib/mock/f39-build-1460480-33209/root/chroot_tmpdir/scmroot/lxtask'...
$ git fetch origin 05c24387a94de2087f4c5826a7c3b50e35e58e2f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lxtask
 * [new ref]         05c24387a94de2087f4c5826a7c3b50e35e58e2f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 05c2438 Update to the latest git