From 09c231965f9f8e8f1e86f127a22f112d63ef4d9b Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Tue, 20 Apr 2021 22:48:59 +0300
Subject: Add buildscript depdb builtin 'env' command

---
 libbuild2/build/script/parser.cxx | 29 ++++++++++++++++++++++++++++-
 libbuild2/build/script/parser.hxx | 13 ++++++++-----
 2 files changed, 36 insertions(+), 6 deletions(-)

(limited to 'libbuild2/build/script')

diff --git a/libbuild2/build/script/parser.cxx b/libbuild2/build/script/parser.cxx
index 4c11688..372c622 100644
--- a/libbuild2/build/script/parser.cxx
+++ b/libbuild2/build/script/parser.cxx
@@ -481,7 +481,7 @@ namespace build2
             next (t, tt);
 
             if (tt != type::word ||
-                (v != "clear" && v != "hash" && v != "string"))
+                (v != "clear" && v != "hash" && v != "string" && v != "env"))
             {
               fail (get_location (t))
                 << "expected 'depdb' builtin command instead of " << t;
@@ -950,6 +950,33 @@ namespace build2
                       << "'depdb string' argument change forcing update of "
                       << ctx.env.target;});
             }
+            else if (cmd == "env")
+            {
+              sha256 cs;
+              const char* pf ("invalid 'depdb env' argument: ");
+
+              try
+              {
+                // Skip <cmd>.
+                //
+                for (auto i (ns.begin () + 1); i != ns.end (); ++i)
+                {
+                  string vn (convert<string> (move (*i)));
+                  build2::script::verify_environment_var_name (vn, pf, ll);
+                  hash_environment (cs, vn);
+                }
+              }
+              catch (const invalid_argument& e)
+              {
+                fail (ll) << pf << e;
+              }
+
+              if (ctx.dd.expect (cs.string ()) != nullptr)
+                l4 ([&] {
+                    ctx.trace (ll)
+                      << "'depdb env' environment change forcing update of "
+                      << ctx.env.target;});
+            }
             else
               assert (false);
           }
diff --git a/libbuild2/build/script/parser.hxx b/libbuild2/build/script/parser.hxx
index b5a45ca..15429e3 100644
--- a/libbuild2/build/script/parser.hxx
+++ b/libbuild2/build/script/parser.hxx
@@ -194,13 +194,16 @@ namespace build2
         // The depdb builtin can be used to change the default dependency
         // change tracking:
         //
-        // depdb clear         - Cancels the default variables, targets, and
-        //                       prerequisites change tracking. Can only be
-        //                       the first depdb builtin call.
+        // depdb clear           - Cancel the default variables, targets, and
+        //                         prerequisites change tracking. Can only be
+        //                         the first depdb builtin call.
         //
-        // depdb hash <args>  - Track the argument list change as a hash.
+        // depdb hash <args>     - Track the argument list change as a hash.
         //
-        // depdb string <arg> - Track the argument (single) change as string.
+        // depdb string <arg>    - Track the argument (single) change as string.
+        //
+        // depdb env <var-names> - Track the environment variables change as a
+        //                         hash.
         //
         optional<location> depdb_clear_;    // 'depdb clear' location if any.
         lines              depdb_preamble_; // Note: excludes 'depdb clear'.
-- 
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