$ git clone -n https://src.fedoraproject.org/rpms/notmuch.git /var/lib/mock/f40-build-799866-142612/root/chroot_tmpdir/scmroot/notmuch
Cloning into '/var/lib/mock/f40-build-799866-142612/root/chroot_tmpdir/scmroot/notmuch'...
$ git fetch origin fee509dd5af443dcc4030a6e1dc85b68f7358b7a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/notmuch
 * [new ref]         fee509dd5af443dcc4030a6e1dc85b68f7358b7a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fee509d Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild