$ git clone -n https://src.fedoraproject.org/rpms/icecat.git /var/lib/mock/f39-build-2547341-61806/root/chroot_tmpdir/scmroot/icecat
Cloning into '/var/lib/mock/f39-build-2547341-61806/root/chroot_tmpdir/scmroot/icecat'...
$ git fetch origin 66b640dd224bcd979ad59f332ee0a58a7f34c5bf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/icecat
 * [new ref]         66b640dd224bcd979ad59f332ee0a58a7f34c5bf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66b640d Release 115.8.0