$ git clone -n https://src.fedoraproject.org/rpms/rust-typenum.git /var/lib/mock/f40-build-2040394-48352/root/chroot_tmpdir/scmroot/rust-typenum
Cloning into '/var/lib/mock/f40-build-2040394-48352/root/chroot_tmpdir/scmroot/rust-typenum'...
$ git fetch origin 7ddc5d4a6ae7dbbd4c6a89507fdebcddb83dd5b8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-typenum
 * [new ref]         7ddc5d4a6ae7dbbd4c6a89507fdebcddb83dd5b8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7ddc5d4 Update to version 1.17.0; Fixes RHBZ#2239172