add eEnv::resolve() to resolve install paths at runtime

4 files changed, 140 insertions, 0 deletions

diff --git a/lib/base/Makefile.am b/lib/base/Makefile.am
index 498244fb..230a37ae 100644
--- a/lib/base/Makefile.am
+++ b/lib/base/Makefile.am
@@ -14,6 +14,8 @@ libenigma_base_la_SOURCES = \
 	console.h \
 	ebase.cpp \
 	ebase.h \
+	eenv.cpp \
+	eenv.h \
 	eerror.cpp \
 	eerror.h \
 	elock.cpp \
@@ -45,3 +47,6 @@ libenigma_base_la_SOURCES = \
 	smartptr.h \
 	thread.cpp \
 	thread.h
+
+EXTRA_DIST = \
+	eenv.cpp.in
diff --git a/lib/base/eenv.cpp.in b/lib/base/eenv.cpp.in
new file mode 100644
index 00000000..52c42147
--- /dev/null
+++ b/lib/base/eenv.cpp.in
@@ -0,0 +1,117 @@
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <wordexp.h>
+#include <lib/base/eenv.h>
+#include <lib/base/eerror.h>
+
+bool eEnv::initialized = false;
+
+void eEnv::initialize()
+{
+	static const struct {
+		std::string name;
+		std::string value;
+	} cfgenv[] = {
+		{ "prefix", "@prefix@" },
+		{ "exec_prefix", "@exec_prefix@" },
+		{ "bindir", "@bindir@" },
+		{ "sbindir", "@sbindir@" },
+		{ "libexecdir", "@libexecdir@" },
+		{ "datarootdir", "@datarootdir@" },
+		{ "datadir", "@datadir@" },
+		{ "sysconfdir", "@sysconfdir@" },
+		{ "sharedstatedir", "@sharedstatedir@" },
+		{ "localstatedir", "@localstatedir@" },
+		{ "libdir", "@libdir@" },
+		{ "localedir", "@localedir@" },
+	};
+	size_t i;
+
+	// 1st pass, as generated by configure.
+	// Variables set by the user will not be overwritten.
+	for (i = 0; i < (sizeof(cfgenv) / sizeof(*cfgenv)); i++) {
+		eDebug("setenv('%s', '%s', 0)", cfgenv[i].name.c_str(), cfgenv[i].value.c_str());
+		setenv(cfgenv[i].name.c_str(), cfgenv[i].value.c_str(), 0);
+	}
+
+	// 2nd pass: Resolve directories.
+	for (i = 0; i < (sizeof(cfgenv) / sizeof(*cfgenv)); i++) {
+		std::string dest;
+		eEnv::resolveVar(dest, "${" + cfgenv[i].name + "}");
+		eDebug("setenv('%s', '%s', 1)", cfgenv[i].name.c_str(), dest.c_str());
+		setenv(cfgenv[i].name.c_str(), dest.c_str(), 1);
+	}
+}
+
+int eEnv::resolveVar(std::string &dest, const char *src)
+{
+	size_t i = 0;
+	int ret;
+	wordexp_t p;
+
+	ret = wordexp(src, &p, WRDE_NOCMD | WRDE_UNDEF);
+	if (ret != 0) {
+		switch (ret) {
+		case WRDE_BADCHAR:
+			eDebug("%s: bad character", __func__);
+			break;
+		case WRDE_BADVAL:
+			eDebug("%s: bad value", __func__);
+			break;
+		case WRDE_CMDSUB:
+			eDebug("%s: invalid command substitution", __func__);
+			break;
+		case WRDE_NOSPACE:
+			eDebug("%s: out of memory", __func__);
+			break;
+		case WRDE_SYNTAX:
+			eDebug("%s: syntax error", __func__);
+			break;
+		default:
+			eDebug("%s: unknown error", __func__);
+			break;
+		}
+
+		return -1;
+	}
+
+	while (i < p.we_wordc) {
+		if (strchr(p.we_wordv[i], '$')) {
+			ret = eEnv::resolveVar(dest, p.we_wordv[i]);
+			if (ret < 0)
+				break;
+		} else {
+			dest.append(p.we_wordv[i]);
+		}
+
+		if (++i < p.we_wordc)
+			dest.append(" ");
+	}
+
+	wordfree(&p);
+	return ret;
+}
+
+int eEnv::resolveVar(std::string &dest, const std::string &src)
+{
+	return eEnv::resolveVar(dest, src.c_str());
+}
+
+std::string eEnv::resolve(const std::string &src)
+{
+	std::string dest;
+
+	if (!initialized) {
+		eEnv::initialize();
+		initialized = true;
+	}
+
+	eDebug("%s: resolve %s", __func__, src.c_str());
+
+	eEnv::resolveVar(dest, src);
+
+	eDebug("%s: -> %s", __func__, dest.c_str());
+
+	return dest;
+}
diff --git a/lib/base/eenv.h b/lib/base/eenv.h
new file mode 100644
index 00000000..3d149f5e
--- /dev/null
+++ b/lib/base/eenv.h
@@ -0,0 +1,16 @@
+#ifndef __lib_base_paths_h
+#define __lib_base_paths_h
+
+#include <string>
+
+class eEnv {
+private:
+	static bool initialized;
+	static void initialize();
+	static int resolveVar(std::string &dest, const char *src);
+	static int resolveVar(std::string &dest, const std::string &src);
+public:
+	static std::string resolve(const std::string &path);
+};
+
+#endif
diff --git a/lib/python/enigma_python.i b/lib/python/enigma_python.i
index 19fb9254..43d94ac9 100644
--- a/lib/python/enigma_python.i
+++ b/lib/python/enigma_python.i
@@ -38,6 +38,7 @@ is usually caused by not marking PSignals as immutable.
 #define SWIG_COMPILE
 #include <lib/base/ebase.h>
 #include <lib/base/smartptr.h>
+#include <lib/base/eenv.h>
 #include <lib/base/eerror.h>
 #include <lib/base/etpm.h>
 #include <lib/base/nconfig.h>
@@ -133,6 +134,7 @@ typedef long time_t;
 %include "std_string.i"
 %include <lib/python/swig.h>
 %include <lib/base/object.h>
+%include <lib/base/eenv.h>
 %include <lib/base/eerror.h>
 
 %immutable eSocketNotifier::activated;