$ git clone -n https://src.fedoraproject.org/rpms/rust-idna0.3.git /var/lib/mock/f38-build-side-43-rust-devel-1409658-31404/root/chroot_tmpdir/scmroot/rust-idna0.3
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1409658-31404/root/chroot_tmpdir/scmroot/rust-idna0.3'...
$ git fetch origin 5dfd997cdb886ed4ca02060bd51592b7011d8d11:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-idna0.3
 * [new ref]         5dfd997cdb886ed4ca02060bd51592b7011d8d11 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5dfd997 Initial import (idna 0.3 compat package)