$ git clone -n https://src.fedoraproject.org/rpms/perl-Mail-Box.git /var/lib/mock/f40-build-2626417-65272/root/chroot_tmpdir/scmroot/perl-Mail-Box
Cloning into '/var/lib/mock/f40-build-2626417-65272/root/chroot_tmpdir/scmroot/perl-Mail-Box'...
$ git fetch origin a9dc9b6fb0b6a8ca3e7f8b6183de653db4507eba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Mail-Box
 * [new ref]         a9dc9b6fb0b6a8ca3e7f8b6183de653db4507eba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a9dc9b6 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild