$ git clone -n https://src.fedoraproject.org/rpms/fcitx5.git /var/lib/mock/f45-build-8845-396/root/chroot_tmpdir/scmroot/fcitx5
Cloning into '/var/lib/mock/f45-build-8845-396/root/chroot_tmpdir/scmroot/fcitx5'...
$ git fetch origin 6a19a8aabcb959f4d7726872ce208686059aa094:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fcitx5
 * [new ref]         6a19a8aabcb959f4d7726872ce208686059aa094 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6a19a8a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild