$ git clone -n https://src.fedoraproject.org/rpms/icecat.git /var/lib/mock/f42-build-3346772-45002/root/chroot_tmpdir/scmroot/icecat
Cloning into '/var/lib/mock/f42-build-3346772-45002/root/chroot_tmpdir/scmroot/icecat'...
$ git fetch origin 825d8dec9725dbcd48a01601be026f7fca31d38b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/icecat
 * [new ref]         825d8dec9725dbcd48a01601be026f7fca31d38b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 825d8de Release 115.21.0