$ git clone -n https://src.fedoraproject.org/rpms/ghc-bytestring-nums.git /var/lib/mock/f40-build-741975-110456/root/chroot_tmpdir/scmroot/ghc-bytestring-nums
Cloning into '/var/lib/mock/f40-build-741975-110456/root/chroot_tmpdir/scmroot/ghc-bytestring-nums'...
$ git reset --hard c0f2c8de48742886101028095d13676b2d5d7d11
HEAD is now at c0f2c8d bump release