$ git clone -n https://src.fedoraproject.org/rpms/perl-Digest-MD4.git /var/lib/mock/f45-build-23180-596/root/chroot_tmpdir/scmroot/perl-Digest-MD4
Cloning into '/var/lib/mock/f45-build-23180-596/root/chroot_tmpdir/scmroot/perl-Digest-MD4'...
$ git fetch origin a76fdf6c4d8ee5b238c078ce16610c6c26f58db5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Digest-MD4
 * [new ref]         a76fdf6c4d8ee5b238c078ce16610c6c26f58db5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a76fdf6 Perl 5.44 rebuild