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Handle OS pretty name on old OS without OS release #35453

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merged 5 commits into from
Nov 13, 2018
Merged

Handle OS pretty name on old OS without OS release #35453

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82e8dff
Handle OS pretty name on old OS without OS release
jasontedor Nov 12, 2018
cac0f9f
Fix Javadocs
jasontedor Nov 12, 2018
c09423d
Javadoc round two
jasontedor Nov 12, 2018
f802b9a
Merge branch 'master' into redhat-release
jasontedor Nov 12, 2018
5c61807
Remove import
jasontedor Nov 12, 2018
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11 changes: 10 additions & 1 deletion qa/evil-tests/src/test/java/org/elasticsearch/monitor/os/EvilOsProbeTests.java
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,7 @@

import java.io.IOException;
import java.nio.file.Files;
import java.util.Collections;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
Expand All @@ -36,7 +37,15 @@ public class EvilOsProbeTests extends ESTestCase {
public void testOsPrettyName() throws IOException {
final OsInfo osInfo = OsProbe.getInstance().osInfo(randomLongBetween(1, 100), randomIntBetween(1, 8));
if (Constants.LINUX) {
final List<String> lines = Files.readAllLines(PathUtils.get("/etc/os-release"));
final List<String> lines;
if (Files.exists(PathUtils.get("/etc/os-release"))) {
lines = Files.readAllLines(PathUtils.get("/etc/os-release"));
} else if (Files.exists(PathUtils.get("/usr/lib/os-release"))) {
lines = Files.readAllLines(PathUtils.get("/usr/lib/os-release"));
} else {
lines = Collections.singletonList(
"PRETTY_NAME=\"" + Files.readAllLines(PathUtils.get("/etc/system-release")).get(0) + "\"");
}
for (final String line : lines) {
if (line != null && line.startsWith("PRETTY_NAME=")) {
final Matcher matcher = Pattern.compile("PRETTY_NAME=(\"?|'?)?([^\"']+)\\1").matcher(line.trim());
Expand Down
28 changes: 20 additions & 8 deletions server/src/main/java/org/elasticsearch/monitor/os/OsProbe.java
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Expand Up @@ -33,6 +33,7 @@
import java.lang.reflect.Method;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
Expand Down Expand Up @@ -566,22 +567,33 @@ private String getPrettyName() throws IOException {
}

/**
* The lines from {@code /etc/os-release} or {@code /usr/lib/os-release} as a fallback. These file represents identification of the
* underlying operating system. The structure of the file is newlines of key-value pairs of shell-compatible variable assignments.
* The lines from {@code /etc/os-release} or {@code /usr/lib/os-release} as a fallback, with an additional fallback to
* {@code /etc/system-release}. These files represent identification of the underlying operating system. The structure of the file is
* newlines of key-value pairs of shell-compatible variable assignments.
*
* @return the lines from {@code /etc/os-release} or {@code /usr/lib/os-release}
* @throws IOException if an I/O exception occurs reading {@code /etc/os-release} or {@code /usr/lib/os-release}
* @return the lines from {@code /etc/os-release} or {@code /usr/lib/os-release} or {@code /etc/system-release}
* @throws IOException if an I/O exception occurs reading {@code /etc/os-release} or {@code /usr/lib/os-release} or
* {@code /etc/system-release}
*/
@SuppressForbidden(reason = "access /etc/os-release or /usr/lib/os-release")
@SuppressForbidden(reason = "access /etc/os-release or /usr/lib/os-release or /etc/system-release")
List<String> readOsRelease() throws IOException {
final List<String> lines;
if (Files.exists(PathUtils.get("/etc/os-release"))) {
lines = Files.readAllLines(PathUtils.get("/etc/os-release"));
} else {
assert lines != null && lines.isEmpty() == false;
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Do we want to have this as an assertion or as an IllegalStateException or similar? If a user runs this on some weird Linux distribution that has an empty file here they might get odd errors later on, although I suppose you could argue that if they're not running on a supported OS then they're on their own anyway.

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Exactly, we code for the platforms that we support and use these assertions to ensure that everything is as expected on those platforms.

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++

return lines;
} else if (Files.exists(PathUtils.get("/usr/lib/os-release"))) {
lines = Files.readAllLines(PathUtils.get("/usr/lib/os-release"));
assert lines != null && lines.isEmpty() == false;
return lines;
} else if (Files.exists(PathUtils.get("/etc/system-release"))) {
// fallback for older Red Hat-like OS
lines = Files.readAllLines(PathUtils.get("/etc/system-release"));
assert lines != null && lines.size() == 1;
return Collections.singletonList("PRETTY_NAME=\"" + lines.get(0) + "\"");
} else {
return Collections.emptyList();
}
assert lines != null && lines.isEmpty() == false;
return lines;
}

public OsStats osStats() {
Expand Down
1 change: 1 addition & 0 deletions server/src/main/resources/org/elasticsearch/bootstrap/security.policy
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Original file line number Diff line number Diff line change
Expand Up @@ -127,6 +127,7 @@ grant {
// OS release on Linux
permission java.io.FilePermission "/etc/os-release", "read";
permission java.io.FilePermission "/usr/lib/os-release", "read";
permission java.io.FilePermission "/etc/system-release", "read";

// io stats on Linux
permission java.io.FilePermission "/proc/self/mountinfo", "read";
Expand Down