$ git clone -n https://src.fedoraproject.org/rpms/firefox.git /var/lib/mock/f31-build-108694-33864/root/chroot_tmpdir/scmroot/firefox
Cloning into '/var/lib/mock/f31-build-108694-33864/root/chroot_tmpdir/scmroot/firefox'...
$ git reset --hard b2802deb3dc56b6e8818a5b565414004377e6cdd
HEAD is now at b2802de Enable profile downgrade