$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Command-Simple.git /var/lib/mock/f45-build-26574-618/root/chroot_tmpdir/scmroot/perl-Test-Command-Simple
Cloning into '/var/lib/mock/f45-build-26574-618/root/chroot_tmpdir/scmroot/perl-Test-Command-Simple'...
$ git fetch origin d5f402a84a2404d7a6098327c413f243db3bb56b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Command-Simple
 * [new ref]         d5f402a84a2404d7a6098327c413f243db3bb56b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5f402a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild