$ git clone -n https://src.fedoraproject.org/rpms/perl-CryptX.git /var/lib/mock/f45-build-22685-593/root/chroot_tmpdir/scmroot/perl-CryptX
Cloning into '/var/lib/mock/f45-build-22685-593/root/chroot_tmpdir/scmroot/perl-CryptX'...
$ git fetch origin 09f4b2a1c79275f9bc83e6807aee6545b2e9ca2e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-CryptX
 * [new ref]         09f4b2a1c79275f9bc83e6807aee6545b2e9ca2e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 09f4b2a Update to 0.091 (RHBZ#2513561)