$ git clone -n https://src.fedoraproject.org/rpms/rust-mime_guess.git /var/lib/mock/f40-build-2082789-49866/root/chroot_tmpdir/scmroot/rust-mime_guess
Cloning into '/var/lib/mock/f40-build-2082789-49866/root/chroot_tmpdir/scmroot/rust-mime_guess'...
$ git fetch origin f56e1e3e2b30c6ce719e0fd0051bb0546293ab6d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-mime_guess
 * [new ref]         f56e1e3e2b30c6ce719e0fd0051bb0546293ab6d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f56e1e3 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild