Pass the varnishd worker environment to the invoked process.

configure.ac

@@ -25,6 +25,7 @@ AC_PROG_CPP
 AC_PATH_PROG([CAT], [cat], [])
 AC_PATH_PROG([TR], [tr], [])
 AC_PATH_PROG([SED], [sed], [])
+AC_PATH_PROG([ENV], [env], [])
 
 AX_PTHREAD(,[AC_MSG_ERROR([Could not configure pthreads support])])
 

src/Makefile.am

@@ -30,7 +30,7 @@ AM_TESTS_ENVIRONMENT = \
 TEST_EXTENSIONS = .vtc
 VTC_LOG_COMPILER = varnishtest -v
 AM_VTC_LOG_FLAGS = -Dvmod_pipe="$(VMOD_PIPE)" -Dcat="$(CAT)" -Dtr="$(TR)" \
-	-Dsed="$(SED)"
+	-Dsed="$(SED)" -Denv="$(ENV)"
 TESTS = @VMOD_TESTS@
 
 # To test an individual VTC test named test.vtc:

src/tests/env.vtc

+# looks like -*- vcl -*-
+
+varnishtest "environment variables in the invoked process"
+
+server s1 {
+	rxreq
+	txresp -body {foo bar baz quux}
+} -start
+
+varnish v1 -vcl+backend {
+	import ${vmod_pipe};
+
+	sub vcl_init {
+		new env = pipe.vdp("${env}");
+		env.arg("-v");
+	}
+
+	sub vcl_deliver {
+		set resp.filters = "env";
+	}
+} -start
+
+client c1 {
+	txreq
+	rxresp
+	expect resp.status == 200
+	expect resp.bodylen > 0
+} -run

src/vdfp_pipe.c

@@ -47,6 +47,8 @@
 
 #include "vcc_if.h"
 
+extern char **environ;
+
 #define VFAIL(ctx, type, fmt, ...)				\
         VRT_fail((ctx), type " pipe failure: " fmt, __VA_ARGS__)
 
@@ -231,8 +233,6 @@ vdp_init(struct req *req, void **priv)
 	}
 
 	if (state->chldpid == 0) {
-		char *envp[] = { NULL };
-
 		close(STDIN_FILENO);
 		close(STDOUT_FILENO);
 		close(STDERR_FILENO);
@@ -247,7 +247,7 @@ vdp_init(struct req *req, void **priv)
 			exit(EXIT_FAILURE);
 
 		errno = 0;
-		if (execve(obj->path, argv, envp) == -1) {
+		if (execve(obj->path, argv, environ) == -1) {
 			VSLb(req->vsl, SLT_Error, "vdfp_pipe: vdp %s: cannot "
 			     "exec %s: %s", obj->name, obj->path,
 			     vstrerror(errno));