$ git clone -n https://src.fedoraproject.org/rpms/erlang-jiffy.git /var/lib/mock/f31-build-47804-26972/root/chroot_tmpdir/scmroot/erlang-jiffy
Cloning into '/var/lib/mock/f31-build-47804-26972/root/chroot_tmpdir/scmroot/erlang-jiffy'...
$ git reset --hard 4ce98308a38c086fd2bdbb15c2423adde71bd558
HEAD is now at 4ce9830 erlang-jiffy ver. 0.15.2