JSON-102: read package version from file

server/server_version.cc

@@ -1,14 +1,16 @@
 #include "server_version.hh"
 #include "inout.hh"
+#include <fstream>
+#include <sstream>
 
 #include <pEp/pEpEngine.h> // for PEP_VERSION and get_engine_version()
 
 namespace {
 
 #ifdef PACKAGE_VERSION
-	const char* const PackageVersion = PACKAGE_VERSION;
+	char* PackageVersion = PACKAGE_VERSION;
 #else
-	const char* const PackageVersion = nullptr;
+	char* PackageVersion = nullptr;
 #endif
 
 
@@ -78,7 +80,21 @@ ServerVersion::ServerVersion(unsigned maj, unsigned min, unsigned p)
 , patch{p}
 , name {VersionName}
 , package_version{PackageVersion}
-{}
+{
+	if (!PackageVersion) {
+		std::ifstream packver("PackageVersion");
+		if (packver.is_open() && packver.good()) {
+			std::stringstream sstr;
+			sstr << packver.rdbuf();
+			std::string contents = sstr.str();
+			contents.erase(std::remove(contents.begin(), contents.end(), '\n'), contents.end());
+			contents.erase(std::remove(contents.begin(), contents.end(), '\r'), contents.end());
+			PackageVersion = new char[contents.length() + 1];
+			strcpy(PackageVersion, contents.c_str());
+			this->package_version = PackageVersion;
+		}
+	}
+}
 
 const ServerVersion& server_version()
 {

server/server_version.hh

@@ -17,7 +17,7 @@ struct ServerVersion
 	// The version name is of the form "(##) name" where ## is a monotonic increasing number.
 	std::string name;
 	
-	const char* const package_version; // must be set via -D, e.g. -D'PACKAGE_VERSION="deb9-0.1"'
+	const char* package_version; // must be set via -D, e.g. -D'PACKAGE_VERSION="deb9-0.1"'
 
 	// returns "major.minor.patch"
 	std::string major_minor_patch() const;