$ git clone -n https://src.fedoraproject.org/rpms/icecat.git /var/lib/mock/f39-build-2102205-50539/root/chroot_tmpdir/scmroot/icecat
Cloning into '/var/lib/mock/f39-build-2102205-50539/root/chroot_tmpdir/scmroot/icecat'...
$ git fetch origin 87f2b73b907f5b7fb85ff03630dcf32f87c0434f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/icecat
 * [new ref]         87f2b73b907f5b7fb85ff03630dcf32f87c0434f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 87f2b73 Release 115.6.0 rh1