[JENKINS-61193] Export no_proxy hosts when using HTTP proxy

src/main/java/org/jenkinsci/plugins/gitclient/CliGitAPIImpl.java

@@ -332,6 +332,7 @@ protected CliGitAPIImpl(String gitExe, File workspace, TaskListener listener, En
         this.listener = listener;
         this.gitExe = gitExe;
         this.environment = environment;
+        this.proxy = null;
 
         if (isZos() && System.getProperty("ibm.system.encoding") != null) {
             this.encoding =
@@ -2079,6 +2080,24 @@ private String launchCommandWithCredentials(
         return launchCommandWithCredentials(args, workDir, credentials, url, TIMEOUT);
     }
 
+    /**
+     * Provides all the no proxy hosts from proxy object
+     * of ProxyConfiguration.  Package protected for testing.
+     * @return hosts not intended to be proxied, concatenated by commas
+     */
+    @NonNull
+    String getNoProxyHosts() {
+        if (proxy == null) {
+            return "";
+        }
+        String noProxyHost = proxy.getNoProxyHost();
+        if (noProxyHost == null || noProxyHost.isEmpty()) {
+            return "";
+        }
+        List<String> noProxyHosts = new ArrayList<>(Arrays.asList(noProxyHost.split("[\t\n,|]+")));
+        return String.join(",", noProxyHosts);
+    }
+
     private String launchCommandWithCredentials(
             ArgumentListBuilder args,
             File workDir,
@@ -2175,6 +2194,7 @@ private String launchCommandWithCredentials(
                             URI http_proxy = new URI("http", userInfo, proxy.name, proxy.port, null, null, null);
                             env.put("http_proxy", http_proxy.toString());
                             env.put("https_proxy", http_proxy.toString());
+                            env.put("no_proxy", getNoProxyHosts());
                         } catch (URISyntaxException ex) {
                             throw new GitException("Failed to create http proxy uri", ex);
                         }

src/test/java/org/jenkinsci/plugins/gitclient/CliGitAPIImplNoProxyHostTest.java

@@ -0,0 +1,44 @@
+package org.jenkinsci.plugins.gitclient;
+
+import static org.hamcrest.MatcherAssert.*;
+import static org.hamcrest.Matchers.*;
+
+import hudson.EnvVars;
+import hudson.ProxyConfiguration;
+import hudson.model.TaskListener;
+import java.io.File;
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * Test that checks all the no proxy hosts are added or not.
+ */
+public class CliGitAPIImplNoProxyHostTest {
+
+    private CliGitAPIImpl cliGit;
+
+    @Before
+    public void createCliGit() {
+        cliGit = new CliGitAPIImpl("git", new File("."), TaskListener.NULL, new EnvVars());
+    }
+
+    @Test
+    public void test_no_proxy_host_is_set_correctly() throws NoSuchFieldException, IllegalAccessException {
+
+        final String proxyHost = "172.16.1.13";
+        final int proxyPort = 3128;
+        final String proxyUser = null;
+        final String proxyPassword = null;
+        final String noProxyHosts = "169.254.169.254";
+
+        ProxyConfiguration proxyConfig =
+                new ProxyConfiguration(proxyHost, proxyPort, proxyUser, proxyPassword, noProxyHosts);
+        cliGit.setProxy(proxyConfig);
+        assertThat(cliGit.getNoProxyHosts(), is(noProxyHosts));
+    }
+
+    @Test
+    public void test_default_value() {
+        assertThat(cliGit.getNoProxyHosts(), is(""));
+    }
+}