Repair malformed Seriatim build state directories

tests/integration

@@ -94,6 +94,39 @@ run_converge \
   tee "$test_tmp/custom-path-repeat.log"
 require_clean_recap "$test_tmp/custom-path-repeat.log"
 
+sudo rm -rf -- "$custom_state"
+sudo install -o root -g root -m 0644 /dev/null "$custom_state"
+run_converge \
+  -e "seriatim_binary_path=$custom_binary" \
+  -e "seriatim_build_state_dir=$custom_state" |
+  tee "$test_tmp/state-file-repair.log"
+require_changed_recap "$test_tmp/state-file-repair.log"
+test -d "$custom_state"
+test ! -L "$custom_state"
+run_converge \
+  -e "seriatim_binary_path=$custom_binary" \
+  -e "seriatim_build_state_dir=$custom_state" |
+  tee "$test_tmp/state-file-repair-repeat.log"
+require_clean_recap "$test_tmp/state-file-repair-repeat.log"
+
+redirected_state="$test_tmp/redirected-build-state"
+sudo rm -rf -- "$custom_state"
+sudo install -d -o root -g root -m 0755 "$redirected_state"
+sudo ln -s "$redirected_state" "$custom_state"
+run_converge \
+  -e "seriatim_binary_path=$custom_binary" \
+  -e "seriatim_build_state_dir=$custom_state" |
+  tee "$test_tmp/state-link-repair.log"
+require_changed_recap "$test_tmp/state-link-repair.log"
+test -d "$custom_state"
+test ! -L "$custom_state"
+test -z "$(find "$redirected_state" -mindepth 1 -maxdepth 1 -print -quit)"
+run_converge \
+  -e "seriatim_binary_path=$custom_binary" \
+  -e "seriatim_build_state_dir=$custom_state" |
+  tee "$test_tmp/state-link-repair-repeat.log"
+require_clean_recap "$test_tmp/state-link-repair-repeat.log"
+
 baseline_binary=$(binary_digest)
 baseline_state=$(state_digest)
 for scenario in \