$ git clone -n https://src.fedoraproject.org/rpms/rust-idna0.3.git /var/lib/mock/f45-build-42507-794/root/chroot_tmpdir/scmroot/rust-idna0.3
Cloning into '/var/lib/mock/f45-build-42507-794/root/chroot_tmpdir/scmroot/rust-idna0.3'...
$ git fetch origin b4294c8ce235fbabffb5bfe9ad6860dbea28f797:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-idna0.3
 * [new ref]         b4294c8ce235fbabffb5bfe9ad6860dbea28f797 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b4294c8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild