$ git clone -n https://src.fedoraproject.org/rpms/maturin.git /var/lib/mock/f45-build-18140-510/root/chroot_tmpdir/scmroot/maturin
Cloning into '/var/lib/mock/f45-build-18140-510/root/chroot_tmpdir/scmroot/maturin'...
$ git fetch origin b0862851a45fb0637a9f2e374c91257dd1cf1d33:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/maturin
 * [new ref]         b0862851a45fb0637a9f2e374c91257dd1cf1d33 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b086285 Update to version 1.15.0; Fixes RHBZ#2522075