$ git clone -n https://src.fedoraproject.org/rpms/nss.git /var/lib/mock/f31-build-107561-33712/root/chroot_tmpdir/scmroot/nss
Cloning into '/var/lib/mock/f31-build-107561-33712/root/chroot_tmpdir/scmroot/nss'...
$ git reset --hard f767d63b1bd068fa292391b91ff1bad1181152e7
HEAD is now at f767d63 Rebuild with NSPR 4.22