$ git clone -n https://src.fedoraproject.org/rpms/rust-typed-arena.git /var/lib/mock/f45-build-45812-828/root/chroot_tmpdir/scmroot/rust-typed-arena
Cloning into '/var/lib/mock/f45-build-45812-828/root/chroot_tmpdir/scmroot/rust-typed-arena'...
$ git fetch origin 11289f4f1be043a856b03d74b1f23ecfae268a24:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-typed-arena
 * [new ref]         11289f4f1be043a856b03d74b1f23ecfae268a24 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 11289f4 Regenerate with rust2rpm v28