$ git clone -n https://src.fedoraproject.org/rpms/xtrlock.git /var/lib/mock/f45-build-39129-732/root/chroot_tmpdir/scmroot/xtrlock
Cloning into '/var/lib/mock/f45-build-39129-732/root/chroot_tmpdir/scmroot/xtrlock'...
$ git fetch origin 17cdfa7c7daa4fbcb2f7d8662fcb7d5fb71e6680:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xtrlock
 * [new ref]         17cdfa7c7daa4fbcb2f7d8662fcb7d5fb71e6680 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 17cdfa7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild