$ git clone -n https://github.com/xcp-ng-rpms/libidn2.git /var/lib/mock/v8.3-u-pcoval1-11077-29512/root/chroot_tmpdir/scmroot/libidn2
Cloning into '/var/lib/mock/v8.3-u-pcoval1-11077-29512/root/chroot_tmpdir/scmroot/libidn2'...
$ git fetch origin 1b4bba20dbd41b5d5d84d055843d813bbfffb156:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/libidn2
 * [new ref]         1b4bba20dbd41b5d5d84d055843d813bbfffb156 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b4bba2 bump release for test build