$ git clone -n https://src.fedoraproject.org/rpms/perl-Digest-MD5.git /var/lib/mock/f40-build-2239109-53596/root/chroot_tmpdir/scmroot/perl-Digest-MD5
Cloning into '/var/lib/mock/f40-build-2239109-53596/root/chroot_tmpdir/scmroot/perl-Digest-MD5'...
$ git fetch origin 96dc27bcacfa80aecbe3c7d4b046876fc62aaea9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Digest-MD5
 * [new ref]         96dc27bcacfa80aecbe3c7d4b046876fc62aaea9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 96dc27b 2.59 bump (rhbz#2256301)