$ git clone -n https://src.fedoraproject.org/rpms/perl-App-Cmd.git /var/lib/mock/f45-build-21697-587/root/chroot_tmpdir/scmroot/perl-App-Cmd
Cloning into '/var/lib/mock/f45-build-21697-587/root/chroot_tmpdir/scmroot/perl-App-Cmd'...
$ git fetch origin c2e811f188c83f9f567fd9fb0a8016ed8a335b4a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-App-Cmd
 * [new ref]         c2e811f188c83f9f567fd9fb0a8016ed8a335b4a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c2e811f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild