$ git clone -n https://src.fedoraproject.org/rpms/rust-signature_derive.git /var/lib/mock/f39-build-1517167-35693/root/chroot_tmpdir/scmroot/rust-signature_derive
Cloning into '/var/lib/mock/f39-build-1517167-35693/root/chroot_tmpdir/scmroot/rust-signature_derive'...
$ git fetch origin 306bb083cdd79981b9ba62513dde97632e5a4d10:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-signature_derive
 * [new ref]         306bb083cdd79981b9ba62513dde97632e5a4d10 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 306bb08 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild