$ git clone -n https://src.fedoraproject.org/rpms/rust-err-derive.git /var/lib/mock/f40-build-2163045-50956/root/chroot_tmpdir/scmroot/rust-err-derive
Cloning into '/var/lib/mock/f40-build-2163045-50956/root/chroot_tmpdir/scmroot/rust-err-derive'...
$ git fetch origin 04843b6ba7a5c2a9834d98125c9ff6606995af96:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-err-derive
 * [new ref]         04843b6ba7a5c2a9834d98125c9ff6606995af96 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 04843b6 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild