$ git clone -n https://src.fedoraproject.org/rpms/firefox.git /var/lib/mock/f38-build-706857-91561/root/chroot_tmpdir/scmroot/firefox
Cloning into '/var/lib/mock/f38-build-706857-91561/root/chroot_tmpdir/scmroot/firefox'...
$ git reset --hard a67d903dec04dbc261030b5ef0499fb806f95666
HEAD is now at a67d903 Build fix