[maven-mvnd] 02/02: Only check `/proc/self` if apparently on Linux (always fall back to VM name)

[ppalaga]

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ppalaga pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/maven-mvnd.git

commit 2ab4cd80831e9de88d4ef752787aecdc4d2b815f
Author: Jesse Glick <jgl...@apache.org>
AuthorDate: Tue Mar 22 14:41:11 2022 -0400

    Only check `/proc/self` if apparently on Linux (always fall back to VM name)
---
 .../org/mvndaemon/mvnd/common/DaemonRegistry.java  | 30 ++++++++++++----------
 1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/common/src/main/java/org/mvndaemon/mvnd/common/DaemonRegistry.java 
b/common/src/main/java/org/mvndaemon/mvnd/common/DaemonRegistry.java
index 7fcf21c..5d3d7a8 100644
--- a/common/src/main/java/org/mvndaemon/mvnd/common/DaemonRegistry.java
+++ b/common/src/main/java/org/mvndaemon/mvnd/common/DaemonRegistry.java
@@ -271,23 +271,25 @@ public class DaemonRegistry implements AutoCloseable {
     private static final int PROCESS_ID = getProcessId0();
 
     private static int getProcessId0() {
-        try {
-            final Path self = Paths.get("/proc/self");
-            if (Files.exists(self)) {
-                String pid = self.toRealPath().getFileName().toString();
-                if (pid.equals("self")) {
-                    LOGGER.debug("/proc/self symlink could not be followed");
-                } else {
-                    LOGGER.debug("loading own PID from /proc/self link: {}", 
pid);
-                    try {
-                        return Integer.parseInt(pid);
-                    } catch (NumberFormatException x) {
-                        LOGGER.warn("Unable to determine PID from malformed 
/proc/self link `" + pid + "`");
+        if (Os.current() == Os.LINUX) {
+            try {
+                final Path self = Paths.get("/proc/self");
+                if (Files.exists(self)) {
+                    String pid = self.toRealPath().getFileName().toString();
+                    if (pid.equals("self")) {
+                        LOGGER.debug("/proc/self symlink could not be 
followed");
+                    } else {
+                        LOGGER.debug("loading own PID from /proc/self link: 
{}", pid);
+                        try {
+                            return Integer.parseInt(pid);
+                        } catch (NumberFormatException x) {
+                            LOGGER.warn("Unable to determine PID from 
malformed /proc/self link `" + pid + "`");
+                        }
                     }
                 }
+            } catch (IOException ignored) {
+                LOGGER.debug("could not load /proc/self", ignored);
             }
-        } catch (IOException ignored) {
-            LOGGER.debug("could not load /proc/self", ignored);
         }
         String vmname = ManagementFactory.getRuntimeMXBean().getName();
         String pid = vmname.split("@", 0)[0];