$ git clone -n https://src.fedoraproject.org/rpms/perl-Unix-Process.git /var/lib/mock/f45-build-27360-622/root/chroot_tmpdir/scmroot/perl-Unix-Process
Cloning into '/var/lib/mock/f45-build-27360-622/root/chroot_tmpdir/scmroot/perl-Unix-Process'...
$ git fetch origin 3294af3e9d160943df3f33a56eb4d5f934c97deb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Unix-Process
 * [new ref]         3294af3e9d160943df3f33a56eb4d5f934c97deb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3294af3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild