$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Output.git /var/lib/mock/f45-build-26778-619/root/chroot_tmpdir/scmroot/perl-Test-Output
Cloning into '/var/lib/mock/f45-build-26778-619/root/chroot_tmpdir/scmroot/perl-Test-Output'...
$ git fetch origin 7a73054391b6b3457d7a087f1dab4653c96d0be2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Output
 * [new ref]         7a73054391b6b3457d7a087f1dab4653c96d0be2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7a73054 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild