$ git clone -n https://src.fedoraproject.org/rpms/mingw-libidn2.git /var/lib/mock/f45-build-18555-521/root/chroot_tmpdir/scmroot/mingw-libidn2
Cloning into '/var/lib/mock/f45-build-18555-521/root/chroot_tmpdir/scmroot/mingw-libidn2'...
$ git fetch origin f08d63ff6ad2600313c3abe501abb22fde1a5a27:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mingw-libidn2
 * [new ref]         f08d63ff6ad2600313c3abe501abb22fde1a5a27 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f08d63f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild