$ git clone -n https://src.fedoraproject.org/rpms/seamonkey.git /var/lib/mock/f38-build-side-42-init-devel-1117232-30184/root/chroot_tmpdir/scmroot/seamonkey
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1117232-30184/root/chroot_tmpdir/scmroot/seamonkey'...
$ git fetch origin 3002b38c6eee541ed6c908b8a90018edbef7f8f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/seamonkey
 * [new ref]         3002b38c6eee541ed6c908b8a90018edbef7f8f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3002b38 backport fix for mozbz 1769631