$ git clone -n https://src.fedoraproject.org/rpms/perl-Digest-Perl-MD5.git /var/lib/mock/f45-build-23142-596/root/chroot_tmpdir/scmroot/perl-Digest-Perl-MD5
Cloning into '/var/lib/mock/f45-build-23142-596/root/chroot_tmpdir/scmroot/perl-Digest-Perl-MD5'...
$ git fetch origin 8c56dd2c6b8d63c8cfdcd1690fb5f7752e9bc59a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Digest-Perl-MD5
 * [new ref]         8c56dd2c6b8d63c8cfdcd1690fb5f7752e9bc59a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8c56dd2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild