$ git clone -n https://src.fedoraproject.org/rpms/libguestfs.git /var/lib/mock/f33-build-534664-64864/root/chroot_tmpdir/scmroot/libguestfs
Cloning into '/var/lib/mock/f33-build-534664-64864/root/chroot_tmpdir/scmroot/libguestfs'...
$ git reset --hard 631e83f5f9b1538a29be610f3f68497b726e792b
HEAD is now at 631e83f Disable LTO.