$ git clone -n https://src.fedoraproject.org/rpms/rust-gag.git /var/lib/mock/f39-build-1624708-39089/root/chroot_tmpdir/scmroot/rust-gag
Cloning into '/var/lib/mock/f39-build-1624708-39089/root/chroot_tmpdir/scmroot/rust-gag'...
$ git fetch origin 2397798d5b6234d75c272369dbacea7eab4a539a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gag
 * [new ref]         2397798d5b6234d75c272369dbacea7eab4a539a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2397798 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild