$ git clone -n https://src.fedoraproject.org/rpms/rust-impls.git /var/lib/mock/f39-build-1493745-34540/root/chroot_tmpdir/scmroot/rust-impls
Cloning into '/var/lib/mock/f39-build-1493745-34540/root/chroot_tmpdir/scmroot/rust-impls'...
$ git fetch origin 8862f794d39ffaf21871eb750b64080c21886b8f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-impls
 * [new ref]         8862f794d39ffaf21871eb750b64080c21886b8f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8862f79 Regenerate with rust2rpm v24