$ git clone -n https://src.fedoraproject.org/rpms/rxvt-unicode.git /var/lib/mock/f45-build-35516-695/root/chroot_tmpdir/scmroot/rxvt-unicode
Cloning into '/var/lib/mock/f45-build-35516-695/root/chroot_tmpdir/scmroot/rxvt-unicode'...
$ git fetch origin 88b200f2132d44dcfdebc6ca1ba92320818ce17c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rxvt-unicode
 * [new ref]         88b200f2132d44dcfdebc6ca1ba92320818ce17c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 88b200f Perl 5.44 rebuild