Plugin dev: how to replace environment variable's value before a build starts?

[Orekaria N]

Hello

I have created this plugin (https://github.com/jenkinsci/global-pre-script-plugin).

The plugin allows to inject variables at the start of any build using a groovy script. It is working very fine.

What I want to improve:

- if the variable was already defined in "manage jenkins -> configure system -> environment variable", injecting a variable with the same name, does not update the value

e.g:

1) environment variable defined in configure system:

  Name: MY_GLOBAL_VAR

  Value: alfa

2) now, in a job:

- when the build starts, the global-pre-inject plugin injects value 'beta' in MY_GLOBAL_VAR

  Value: beta

- when a build step of type execute shell is added:

  echo "MY_GLOBAL_VAR: $MY_GLOBAL_VAR"

- the build console log result:

  MY_GLOBAL_VAR: alfa

issue: the value was overwritten again after the plugin did it

What I am looking for:

Could you tell me where I should inject the value of a variable so it can replace a variable with the same name set in "manage jenkins -> configure system -> environment variables", when a build starts?

Please be specific, I am new to jenkins internals

More info:

- I am currently injecting properties overriding setUpEnvironment of RunListener and returning

return new Environment() {
    @Override
    public void buildEnvVars(Map<String, String> env) {
        env.putAll(groovyMapEnvVars);
    }
};

- I can also inject new values with, e.g. :

EnvironmentContributor.all().add(1, new EnvironmentContributor() {
    @Override
    public void buildEnvironmentFor(@Nonnull Run r, @Nonnull EnvVars envs, @Nonnull TaskListener listener) throws IOException, InterruptedException {
        envs.put("NEW_VAR", "somevalue");
    }
});

Thanks in advance

[Markus Winter]

The envinject plugin allows to configure groovy scripts that set environment variables.
So why write another plugin?

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Am 04.03.20, 17:08 schrieb Orekaria N <orek...@gmail.com>:

        envs . put ( "NEW_VAR" , "somevalue" );
    }
});

Thanks in advance

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