From f50d0d58c8eb659e803282e19cf15398e3a8e373 Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Wed, 3 Jun 2020 14:38:39 +0300
Subject: Fix $process.run() to properly handle proces_path_ex

---
 libbuild2/build/script/parser.cxx | 12 +++---------
 libbuild2/functions-process.cxx   | 34 +++++++++++++++++++++++++++-------
 libbuild2/variable.cxx            | 15 ++++++++++++++-
 libbuild2/variable.hxx            | 14 ++++++++++----
 4 files changed, 54 insertions(+), 21 deletions(-)

diff --git a/libbuild2/build/script/parser.cxx b/libbuild2/build/script/parser.cxx
index 2a0555e..c4c4b03 100644
--- a/libbuild2/build/script/parser.cxx
+++ b/libbuild2/build/script/parser.cxx
@@ -475,18 +475,12 @@ namespace build2
         {
           // Find the end of the value.
           //
-          auto b (ns.begin ()), i (b), e (ns.end ());
-          for (i += i->pair ? 2 : 1; i != e && i->pair; i += 2)
-          {
-            if (!i->simple () ||
-                (i->value != "name" && i->value != "checksum"))
-              break;
-          }
+          auto b (ns.begin ());
+          auto i (value_traits<process_path_ex>::find_end (ns));
 
           if (b->pair || i != b + 1) // First is a pair or pairs after.
           {
-            pp_ns.insert (pp_ns.end (),
-                          make_move_iterator (b), make_move_iterator (i));
+            pp_ns = names (make_move_iterator (b), make_move_iterator (i));
 
             ns.erase (b, i);
 
diff --git a/libbuild2/functions-process.cxx b/libbuild2/functions-process.cxx
index e6c0582..de06f27 100644
--- a/libbuild2/functions-process.cxx
+++ b/libbuild2/functions-process.cxx
@@ -210,19 +210,39 @@ namespace build2
     if (args.empty () || args[0].empty ())
       fail << "executable name expected in process." << fn << "()";
 
-    process_path pp;
+    optional<process_path> pp;
+
     try
     {
       size_t erase;
 
-      // This can be a process_path (pair) or just a path.
+      // This can be a process_path (pair), process_path_ex (process_path
+      // followed by the name@ and checksum@ pairs), or just a path.
+      //
+      // First, check if the arguments begin with a process_path[_ex] and, if
+      // that's the case, only use the leading name/pair to create the process
+      // path, discarding the meta-information.
       //
-      if (args[0].pair)
+      if (args[0].file ())
       {
-        pp = convert<process_path> (move (args[0]), move (args[1]));
-        erase = 2;
+        // Find the end of the process_path[_ex] value.
+        //
+        auto b (args.begin ());
+        auto i (value_traits<process_path_ex>::find_end (args));
+
+        if (b->pair || i != b + 1) // First is a pair or pairs after.
+        {
+          pp = convert<process_path> (
+            names (make_move_iterator (b),
+                   make_move_iterator (b + (b->pair ? 2 : 1))));
+
+          erase = i - b;
+        }
       }
-      else
+
+      // Fallback to a path, if this is not a process path.
+      //
+      if (!pp)
       {
         // Strip the builtin-escaping '^' character, if present.
         //
@@ -254,7 +274,7 @@ namespace build2
       fail << "invalid process." << fn << "() executable path: " << e;
     }
 
-    return pair<process_path, strings> (move (pp),
+    return pair<process_path, strings> (move (*pp),
                                         program_args (move (args), fn));
   }
 
diff --git a/libbuild2/variable.cxx b/libbuild2/variable.cxx
index e0502ef..9009fdc 100644
--- a/libbuild2/variable.cxx
+++ b/libbuild2/variable.cxx
@@ -1083,7 +1083,7 @@ namespace build2
 
       const string& k ((i++)->value);
 
-      // NOTE: see also build::script::parser::parse_program().
+      // NOTE: see also find_end() below.
       //
       if (k == "name")
       {
@@ -1107,6 +1107,19 @@ namespace build2
     return pp;
   }
 
+  names::iterator value_traits<process_path_ex>::
+  find_end (names& ns)
+  {
+    auto b (ns.begin ()), i (b), e (ns.end ());
+    for (i += i->pair ? 2 : 1; i != e && i->pair; i += 2)
+    {
+      if (!i->simple () || (i->value != "name" && i->value != "checksum"))
+        break;
+    }
+
+    return i;
+  }
+
   static void
   process_path_ex_assign (value& v, names&& ns, const variable* var)
   {
diff --git a/libbuild2/variable.hxx b/libbuild2/variable.hxx
index 9febe5e..c1cfa84 100644
--- a/libbuild2/variable.hxx
+++ b/libbuild2/variable.hxx
@@ -881,8 +881,8 @@ namespace build2
     static_assert (sizeof (process_path) <= value::size_,
                    "insufficient space");
 
-    // Represented as a @-pair of names. As a result it cannot be stored in a
-    // container.
+    // Represented as a potential @-pair of name(s). As a result it cannot be
+    // stored in a container.
     //
     static process_path convert (name&&, name*);
     static void assign (value&, process_path&&);
@@ -902,8 +902,9 @@ namespace build2
     static_assert (sizeof (process_path_ex) <= value::size_,
                    "insufficient space");
 
-    // Represented as a @-pair of names corresponding to process_path followed
-    // by the name@ and checksum@ pairs. So it's a container-like.
+    // Represented as a potential @-pair of name(s) corresponding to
+    // process_path followed by the name@ and checksum@ pairs. So it's a
+    // container-like.
     //
     static process_path_ex convert (names&&);
     static void assign (value&, process_path_ex&&);
@@ -912,6 +913,11 @@ namespace build2
     static const bool empty_value = true;
     static const char* const type_name;
     static const build2::value_type value_type;
+
+    // Find the end of the process_path_ex value representation assuming
+    // the first name or name pair is the process_path representation.
+    //
+    static names::iterator find_end (names&);
   };
 
   // target_triplet
-- 
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