$ git clone -n https://src.fedoraproject.org/rpms/gnome-tour.git /var/lib/mock/f40-build-2238109-53557/root/chroot_tmpdir/scmroot/gnome-tour
Cloning into '/var/lib/mock/f40-build-2238109-53557/root/chroot_tmpdir/scmroot/gnome-tour'...
$ git fetch origin 908fa3ca14d80309309eec3f37ceeb1a21f5da10:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-tour
 * [new ref]         908fa3ca14d80309309eec3f37ceeb1a21f5da10 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 908fa3c Update to 45.0