nix-build: extend the meaning of $IN_NIX_SHELL

vcunat · vcunat · commit 1bffd83e1a9c · 2016-08-11T17:14:09.000+02:00
An equivalent was originally filed against the perl version: #933
diff --git a/src/nix-build/nix-build.cc b/src/nix-build/nix-build.cc
@@ -332,7 +332,7 @@ int main(int argc, char ** argv)
         }
 
         if (runEnv)
-            setenv("IN_NIX_SHELL", "1", 1);
+            setenv("IN_NIX_SHELL", pure ? "pure" : "impure", 1);
 
         for (auto & expr : exprs) {
             // Instantiate.

Original file line number	Diff line number	Diff line change
`@@ -332,7 +332,7 @@ int main(int argc, char ** argv)`
`332`	`332`	`}`
`333`	`333`
`334`	`334`	`if (runEnv)`
`335`		`- setenv("IN_NIX_SHELL", "1", 1);`
	`335`	`+ setenv("IN_NIX_SHELL", pure ? "pure" : "impure", 1);`
`336`	`336`
`337`	`337`	`for (auto & expr : exprs) {`
`338`	`338`	`// Instantiate.`