$ git clone -n https://src.fedoraproject.org/rpms/rust-tzfile.git /var/lib/mock/f38-build-side-43-rust-devel-1406706-31261/root/chroot_tmpdir/scmroot/rust-tzfile
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1406706-31261/root/chroot_tmpdir/scmroot/rust-tzfile'...
$ git fetch origin b71abb97e1fa8e270b17e22953f9a6e868212287:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tzfile
 * [new ref]         b71abb97e1fa8e270b17e22953f9a6e868212287 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b71abb9 Bump chrono-tz dev-dependency from 0.5 to 0.8