$ git clone -n https://github.com/xcp-ng-rpms/curl /var/lib/mock/v8.3-u-prebuild-9206-28003/root/chroot_tmpdir/scmroot/curl
Cloning into '/var/lib/mock/v8.3-u-prebuild-9206-28003/root/chroot_tmpdir/scmroot/curl'...
$ git fetch origin 2f82536265a7349a3661beedf505a882ba3241c0:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/curl
 * [new ref]         2f82536265a7349a3661beedf505a882ba3241c0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2f82536 bump release for test build