$ git clone -n https://src.fedoraproject.org/rpms/jack-mixer.git /var/lib/mock/f39-build-1502222-34902/root/chroot_tmpdir/scmroot/jack-mixer
Cloning into '/var/lib/mock/f39-build-1502222-34902/root/chroot_tmpdir/scmroot/jack-mixer'...
$ git fetch origin c09e1f221a5c9ae851f572a9ef16e2b470fe5d96:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jack-mixer
 * [new ref]         c09e1f221a5c9ae851f572a9ef16e2b470fe5d96 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c09e1f2 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild