$ git clone -n https://src.fedoraproject.org/rpms/perl-Crypt-IDEA.git /var/lib/mock/f41-build-815860-149783/root/chroot_tmpdir/scmroot/perl-Crypt-IDEA
Cloning into '/var/lib/mock/f41-build-815860-149783/root/chroot_tmpdir/scmroot/perl-Crypt-IDEA'...
$ git fetch origin 5af11341f8e47d6889cc477af696ec4c159a3548:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Crypt-IDEA
 * [new ref]         5af11341f8e47d6889cc477af696ec4c159a3548 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5af1134 Perl 5.40 rebuild