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Change By:
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Arnaud Nauwynck
(06/Jun/13 12:42 PM)
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Description:
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the EnvInject plugin does not really set the "environment variables" at the OS level, using native POSIX call "putenv()".
It is only available in some jenkins sub-tasks when calling appropriate jenkins API to exec tasks... but not when calling plain old java code "System.exec()" within a Mojo.... so most Mojo don't work (my problem was when using maven-dotnet-plugin, that forks to execute "Msbuild.exe")
When doing few search over google to set an environment variable in java, I found a piece of code that might be "portable enough", using JNA native calls to standards dlls (msvcrt on Windows / libc on Linux, which solve 100% of my needs)
It simply exposes a method "putenv()" to be called as this:
{quote}SetEnvUtil.putenv("testvar", "123", 1); {quote}
So my request is to add such calls within the EnvInject plugin, but I don't know how to patch exactly the EnvInject jenkins plugin
It depends on the JNA jar, for example using the maven dependency
{
{monospaced
code
}
}
<dependency>
<groupId>net.java.dev.jna</groupId>
<artifactId>jna</artifactId>
<version>3.4.0</version>
</dependency>
{
{monospaced
code
}
}
Here is the utility class
{
{monospaced
code:title=SetEnvUtil.java
}
}
import com.sun.jna.Library;
import com.sun.jna.Native;
public class SetEnvUtil {
// Inside the Environment class...
public interface WinLibC extends Library {
public String getenv(String name);
public int _putenv(String name);
}
public interface LinuxLibC extends Library {
public String getenv(String name);
public int setenv(String name, String value, int overwrite);
public int unsetenv(String name);
}
private static Object libc;
static {
String osName = System.getProperty("os.name");
if (osName.equals("Linux")) {
libc = Native.loadLibrary("c", LinuxLibC.class);
} else {
libc = Native.loadLibrary("msvcrt", WinLibC.class);
}
}
public static String getenv(String name) {
if (libc instanceof LinuxLibC) {
return ((LinuxLibC) libc).getenv(name);
} else {
return ((WinLibC) libc).getenv(name);
}
}
public static int setenv(String name, String value, int overwrite) {
if (libc instanceof LinuxLibC) {
return ((LinuxLibC) libc).setenv(name, value, overwrite);
} else {
return ((WinLibC) libc)._putenv(name + "=" + value);
}
}
public static int unsetenv(String name) {
if (libc instanceof LinuxLibC) {
return ((LinuxLibC) libc).unsetenv(name);
} else {
return ((WinLibC) libc)._putenv(name + "=");
}
}
}
{
{monospaced
code
}
}
I have done a simple Main for testing purpose, so you can convinced it works simply:
{
{monospaced
code:title=SetEnvMain.java
}
}
public class SetEnvMain {
public static final String TEST_VAR_NAME = "TEST_VAR";
public static void main(String[] args) {
dump("before setenv() ... ");
// *** first setenv() : add new env var
SetEnvUtil.setenv(TEST_VAR_NAME , "123", 1);
dump("after setenv(\"" + TEST_VAR_NAME + ", \"123\") ... ");
// *** second call setenv() : override existing var
SetEnvUtil.setenv(TEST_VAR_NAME , "456", 1);
dump("after setenv(\"" + TEST_VAR_NAME + ", \"456\") ... ");
}
public static void dump(String messagePrefix) {
String var_native = SetEnvUtil.getenv(TEST_VAR_NAME);
String var_cached = System.getenv(TEST_VAR_NAME); // FALSE... cached by java!
System.out.println(messagePrefix + " " + TEST_VAR_NAME + ": " + var_native + ", (cached): " + var_cached);
}
}
{
{monospaced
code
}
}
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