$ git clone -n https://src.fedoraproject.org/rpms/emacs-blacken.git /var/lib/mock/f39-build-1560401-37338/root/chroot_tmpdir/scmroot/emacs-blacken
Cloning into '/var/lib/mock/f39-build-1560401-37338/root/chroot_tmpdir/scmroot/emacs-blacken'...
$ git fetch origin 07540fb0ae0276a1d76228932754d5eb67ee4361:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/emacs-blacken
 * [new ref]         07540fb0ae0276a1d76228932754d5eb67ee4361 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 07540fb Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild