$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-11301-29637/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-11301-29637/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 984b5f6e510ec38ea01a394689de3bfff9774346:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         984b5f6e510ec38ea01a394689de3bfff9774346 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 984b5f6 bump release for test build