$ git clone -n https://github.com/xcp-ng-rpms/lvm2.git /var/lib/mock/v8.3-u-prebuild-9269-28049/root/chroot_tmpdir/scmroot/lvm2
Cloning into '/var/lib/mock/v8.3-u-prebuild-9269-28049/root/chroot_tmpdir/scmroot/lvm2'...
$ git fetch origin 8a4bb75359d87a7b659a36dd42df691a4cfa6ff8:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/lvm2
 * [new ref]         8a4bb75359d87a7b659a36dd42df691a4cfa6ff8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8a4bb75 bump release for test build