$ git clone -n https://github.com/xcp-ng-rpms/xs-opam-repo /var/lib/mock/v8.3-u-psafont1-10266-28847/root/chroot_tmpdir/scmroot/xs-opam-repo
Cloning into '/var/lib/mock/v8.3-u-psafont1-10266-28847/root/chroot_tmpdir/scmroot/xs-opam-repo'...
$ git fetch origin dbcf96a9636f28b0afcdf01cb057d950abd0e444:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xs-opam-repo
 * [new ref]         dbcf96a9636f28b0afcdf01cb057d950abd0e444 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
Filtering content: 100% (2/2)
Filtering content: 100% (2/2), 38.53 MiB | 28.49 MiB/s, done.
HEAD is now at dbcf96a bump release for test build