$ git clone -n https://src.fedoraproject.org/rpms/firefox.git /var/lib/mock/f41-build-1020723-18018/root/chroot_tmpdir/scmroot/firefox
Cloning into '/var/lib/mock/f41-build-1020723-18018/root/chroot_tmpdir/scmroot/firefox'...
$ git fetch origin 74a3220fcc39ca432e642cec4c8573ca4d812246:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/firefox
 * [new ref]         74a3220fcc39ca432e642cec4c8573ca4d812246 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 74a3220 Fix duplicated camera entries with PipeWire