$ git clone -n https://src.fedoraproject.org/rpms/pam_script.git /var/lib/mock/f41-build-side-1-2650379-27586/root/chroot_tmpdir/scmroot/pam_script
Cloning into '/var/lib/mock/f41-build-side-1-2650379-27586/root/chroot_tmpdir/scmroot/pam_script'...
$ git fetch origin 64dbee1efdeafaa551c08ef14125912e48d6891a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pam_script
 * [new ref]         64dbee1efdeafaa551c08ef14125912e48d6891a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 64dbee1 convert GPLv2+ license to SPDX