$ git clone -n https://src.fedoraproject.org/rpms/icecat.git /var/lib/mock/f40-build-2691808-68158/root/chroot_tmpdir/scmroot/icecat
Cloning into '/var/lib/mock/f40-build-2691808-68158/root/chroot_tmpdir/scmroot/icecat'...
$ git fetch origin 63e2e731dedb4132b3bc8d23c5668f7c7409142e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/icecat
 * [new ref]         63e2e731dedb4132b3bc8d23c5668f7c7409142e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 63e2e73 Merge branch 'main' into f40