$ git clone -n https://src.fedoraproject.org/rpms/rust-y4m.git /var/lib/mock/f39-build-1517524-35739/root/chroot_tmpdir/scmroot/rust-y4m
Cloning into '/var/lib/mock/f39-build-1517524-35739/root/chroot_tmpdir/scmroot/rust-y4m'...
$ git fetch origin 11d7b3bb71db055101952149ae77bc3686394ccd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-y4m
 * [new ref]         11d7b3bb71db055101952149ae77bc3686394ccd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 11d7b3b Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild