M #-: VR: Further improve the load_env parser (#100)

This handles cases where extra empty lines and line breaks are inserted.

appliances/lib/helpers.rb

@@ -41,30 +41,27 @@ def load_env(path = '/run/one-context/one_env')
     #       literal newlines!
     folded = Enumerator.new do |y|
         cached = []
-        File.read(path).lines.each do |line|
-            if (stripped = line.strip).end_with?(%["])
-                cached << stripped
-                y << cached.join
+
+        yield_prev_line = -> do
+            unless cached.empty?
+                y << cached.join.gsub(/./m, replacements)
                 cached = []
-            else
-                escaped = line.gsub(/./m, replacements)
-                cached << escaped
             end
         end
-    end
-
-    folded.each do |line|
-        line.strip!
-        next if line.empty?
 
-        next unless line.start_with?(%[export ]) && line.end_with?(%["])
+        File.read(path).lines.each do |line|
+            yield_prev_line.call if line =~ /^export [^=]+="/
+            cached << line
+        end
 
-        line.delete_prefix!(%[export ])
+        yield_prev_line.call
+    end
 
-        k, v = line.split(%[=], 2)
-        next if v.nil?
+    folded.each do |line|
+        # Everything to the right of the last " is discarded!
+        next unless line =~ /^export ([^=]+)=(".*")[^"]*$/
 
-        ENV[k] = v.undump
+        ENV[$1] = $2.undump
     end
 end
 

appliances/lib/tests.rb

@@ -34,6 +34,27 @@
                 export E2="A
                 B\nC"
               INPUT
+            ],
+            [ { :E1 => "\nA\nB\n",
+                :E2 => "\nA\nB",
+                :E3 => "A\n\nB\n" },
+              <<~'INPUT'
+
+                export E1="
+                A
+                B
+                "
+
+                export E2="
+                A
+                B"
+
+                export E3="A
+
+                B
+                "
+
+              INPUT
             ]
         ]
         Dir.mktmpdir do |dir|