$ git clone -n https://github.com/xcp-ng-rpms/libidn2.git /var/lib/mock/v8.3-u-pcoval1-11030-29464/root/chroot_tmpdir/scmroot/libidn2
Cloning into '/var/lib/mock/v8.3-u-pcoval1-11030-29464/root/chroot_tmpdir/scmroot/libidn2'...
$ git fetch origin 944d044a78a276a17ec9898be7f68d421f5d33dc:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/libidn2
 * [new ref]         944d044a78a276a17ec9898be7f68d421f5d33dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 944d044 bump release for test build