$ git clone -n https://src.fedoraproject.org/rpms/libXNVCtrl.git /var/lib/mock/f40-build-2238052-53555/root/chroot_tmpdir/scmroot/libXNVCtrl
Cloning into '/var/lib/mock/f40-build-2238052-53555/root/chroot_tmpdir/scmroot/libXNVCtrl'...
$ git fetch origin 02eee8757ad2c345996c51b55209f45eda222003:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libXNVCtrl
 * [new ref]         02eee8757ad2c345996c51b55209f45eda222003 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 02eee87 Remove vendor special case