$ git clone -n https://github.com/xcp-ng-rpms/lvm2.git /var/lib/mock/v8.3-u-pcoval2-11435-29744/root/chroot_tmpdir/scmroot/lvm2
Cloning into '/var/lib/mock/v8.3-u-pcoval2-11435-29744/root/chroot_tmpdir/scmroot/lvm2'...
$ git fetch origin 91459b135ae46891262048e61a8ff52840f4492c:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/lvm2
 * [new ref]         91459b135ae46891262048e61a8ff52840f4492c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 91459b1 bump release for test build