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Posted to issues@maven.apache.org by GitBox <gi...@apache.org> on 2022/10/16 07:23:59 UTC
[GitHub] [maven-mvnd] gnodet commented on a diff in pull request #716: calculate java home from java command
gnodet commented on code in PR #716:
URL: https://github.com/apache/maven-mvnd/pull/716#discussion_r996400406
##########
common/src/main/java/org/mvndaemon/mvnd/common/OsUtils.java:
##########
@@ -101,6 +102,29 @@ public static long findProcessRssInKb(long pid) {
}
}
+ public static String findJavaHomeFromPATH() {
+ final String basename = Os.current().isUnixLike() ? "java" : "java.exe";
+ final String PATH = System.getenv("PATH");
Review Comment:
Please use lowercase `path` for variable names.
##########
common/src/main/java/org/mvndaemon/mvnd/common/OsUtils.java:
##########
@@ -101,6 +102,29 @@ public static long findProcessRssInKb(long pid) {
}
}
+ public static String findJavaHomeFromPATH() {
+ final String basename = Os.current().isUnixLike() ? "java" : "java.exe";
+ final String PATH = System.getenv("PATH");
+ if (null == PATH) {
+ return null;
+ }
+ for (final String dirname : PATH.split(File.pathSeparator)) {
+ final File java = new File(dirname, basename);
+ if (java.isFile() && java.canExecute()) {
+ final String[] cmd = { java.getAbsolutePath(), "-XshowSettings:properties", "-version" };
+ final List<String> output = new ArrayList<String>(1);
+ exec(cmd, output);
+ final List<String> javaHomeLines = output.stream().filter(l -> l.contains(" java.home = "))
Review Comment:
No need for `final` here.
##########
common/src/main/java/org/mvndaemon/mvnd/common/OsUtils.java:
##########
@@ -101,6 +102,29 @@ public static long findProcessRssInKb(long pid) {
}
}
+ public static String findJavaHomeFromPATH() {
+ final String basename = Os.current().isUnixLike() ? "java" : "java.exe";
+ final String PATH = System.getenv("PATH");
+ if (null == PATH) {
+ return null;
+ }
+ for (final String dirname : PATH.split(File.pathSeparator)) {
Review Comment:
This is not completely right. If one of the path element contains an escaped reserved character such as `:`, this won't work. The split should have to take that into account, maybe by using a regex that ensures that the `pathSeparator` is not preceded by an odd number of backslashes.
##########
common/src/main/java/org/mvndaemon/mvnd/common/OsUtils.java:
##########
@@ -101,6 +102,29 @@ public static long findProcessRssInKb(long pid) {
}
}
+ public static String findJavaHomeFromPATH() {
+ final String basename = Os.current().isUnixLike() ? "java" : "java.exe";
+ final String PATH = System.getenv("PATH");
+ if (null == PATH) {
+ return null;
+ }
+ for (final String dirname : PATH.split(File.pathSeparator)) {
+ final File java = new File(dirname, basename);
+ if (java.isFile() && java.canExecute()) {
+ final String[] cmd = { java.getAbsolutePath(), "-XshowSettings:properties", "-version" };
+ final List<String> output = new ArrayList<String>(1);
Review Comment:
The size of `1` does not make much sense here. The output will most probably include much more lines.
##########
common/src/main/java/org/mvndaemon/mvnd/common/OsUtils.java:
##########
@@ -101,6 +102,29 @@ public static long findProcessRssInKb(long pid) {
}
}
+ public static String findJavaHomeFromPATH() {
+ final String basename = Os.current().isUnixLike() ? "java" : "java.exe";
+ final String PATH = System.getenv("PATH");
+ if (null == PATH) {
+ return null;
+ }
+ for (final String dirname : PATH.split(File.pathSeparator)) {
+ final File java = new File(dirname, basename);
Review Comment:
Use nio2 `Path` as in most mvnd code.
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