$ git clone -n https://src.fedoraproject.org/rpms/rust-os_type.git /var/lib/mock/f40-build-2063023-49167/root/chroot_tmpdir/scmroot/rust-os_type
Cloning into '/var/lib/mock/f40-build-2063023-49167/root/chroot_tmpdir/scmroot/rust-os_type'...
$ git fetch origin 8ed629b91e0edecc1c4e65484c4f0a14b8d730a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-os_type
 * [new ref]         8ed629b91e0edecc1c4e65484c4f0a14b8d730a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8ed629b Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild