$ git clone -n https://github.com/xcp-ng-rpms/libidn2.git /var/lib/mock/v8.3-u-pcoval2-10921-29402/root/chroot_tmpdir/scmroot/libidn2
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10921-29402/root/chroot_tmpdir/scmroot/libidn2'...
$ git fetch origin 0883a5357dabd70c250a2c20018e67269d67f25f:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/libidn2
 * [new ref]         0883a5357dabd70c250a2c20018e67269d67f25f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0883a53 bump release for test build