$ git clone -n https://src.fedoraproject.org/rpms/rust-idna.git /var/lib/mock/f40-build-2713524-72147/root/chroot_tmpdir/scmroot/rust-idna
Cloning into '/var/lib/mock/f40-build-2713524-72147/root/chroot_tmpdir/scmroot/rust-idna'...
$ git fetch origin b54f22a282eaa2ad148bb1080589d1ebf3c2ec70:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-idna
 * [new ref]         b54f22a282eaa2ad148bb1080589d1ebf3c2ec70 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b54f22a Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild