$ git clone -n https://src.fedoraproject.org/rpms/rust-signature_derive1.git /var/lib/mock/f40-build-2716649-72667/root/chroot_tmpdir/scmroot/rust-signature_derive1
Cloning into '/var/lib/mock/f40-build-2716649-72667/root/chroot_tmpdir/scmroot/rust-signature_derive1'...
$ git fetch origin b4c04c812c0fdb5e18ae155ac89628eaad44aab0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-signature_derive1
 * [new ref]         b4c04c812c0fdb5e18ae155ac89628eaad44aab0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b4c04c8 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild