$ git clone -n https://src.fedoraproject.org/rpms/upx.git /var/lib/mock/f40-build-2044258-48698/root/chroot_tmpdir/scmroot/upx
Cloning into '/var/lib/mock/f40-build-2044258-48698/root/chroot_tmpdir/scmroot/upx'...
$ git fetch origin ba6186e5c321f4047e3d210dcf8f2fc429e257dc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/upx
 * [new ref]         ba6186e5c321f4047e3d210dcf8f2fc429e257dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ba6186e 4.2.1