$ git clone -n https://src.fedoraproject.org/rpms/perl-Digest-JHash.git /var/lib/mock/f45-build-23141-596/root/chroot_tmpdir/scmroot/perl-Digest-JHash
Cloning into '/var/lib/mock/f45-build-23141-596/root/chroot_tmpdir/scmroot/perl-Digest-JHash'...
$ git fetch origin bf13c5d76f1885f0e95531e5424e0fc85228797e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Digest-JHash
 * [new ref]         bf13c5d76f1885f0e95531e5424e0fc85228797e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf13c5d Perl 5.44 rebuild