$ git clone -n https://src.fedoraproject.org/rpms/perl-Proc-Guard.git /var/lib/mock/f45-build-25922-613/root/chroot_tmpdir/scmroot/perl-Proc-Guard
Cloning into '/var/lib/mock/f45-build-25922-613/root/chroot_tmpdir/scmroot/perl-Proc-Guard'...
$ git fetch origin b1290101548998d6722a3e29ecc5c74a1d1268b3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Proc-Guard
 * [new ref]         b1290101548998d6722a3e29ecc5c74a1d1268b3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b129010 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild