$ git clone -n https://github.com/xcp-ng-rpms/libtevent /var/lib/mock/v8.3-u-pcoval1-11108-29533/root/chroot_tmpdir/scmroot/libtevent
Cloning into '/var/lib/mock/v8.3-u-pcoval1-11108-29533/root/chroot_tmpdir/scmroot/libtevent'...
$ git fetch origin 77de31f386d1603526ac5cff3eb450649ed50886:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/libtevent
 * [new ref]         77de31f386d1603526ac5cff3eb450649ed50886 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 77de31f bump release for test build