$ git clone -n https://src.fedoraproject.org/rpms/rust-cstr.git /var/lib/mock/f40-build-2137082-50821/root/chroot_tmpdir/scmroot/rust-cstr
Cloning into '/var/lib/mock/f40-build-2137082-50821/root/chroot_tmpdir/scmroot/rust-cstr'...
$ git fetch origin 7f6875264db9da401a99c84e237cd1470dd0d2d5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cstr
 * [new ref]         7f6875264db9da401a99c84e237cd1470dd0d2d5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7f68752 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild