$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Routine.git /var/lib/mock/f45-build-26822-619/root/chroot_tmpdir/scmroot/perl-Test-Routine
Cloning into '/var/lib/mock/f45-build-26822-619/root/chroot_tmpdir/scmroot/perl-Test-Routine'...
$ git fetch origin f2fa0a38dd3ef63a3413007fda02e88622cd80c1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Routine
 * [new ref]         f2fa0a38dd3ef63a3413007fda02e88622cd80c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f2fa0a3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild