Mercurial > hg > release > thermostat-2.0
view common/portability/src/main/java/com/redhat/thermostat/common/portability/internal/linux/EtcOsRelease.java @ 2574:cd5b08c32052
[PATCH] refactoring portable code part 2
Move more of the Linux "/proc" code into the portability package.
Change pom files to detect linux using os name rather than os family.
Reviewed-by: ebaron, neugens
Review Thread:http://icedtea.classpath.org/pipermail/thermostat/2017-January/022054.html
author | Simon Tooke <stooke@redhat.com> |
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date | Mon, 30 Jan 2017 10:30:19 -0500 |
parents | system-backend/src/main/java/com/redhat/thermostat/backend/system/internal/linux/EtcOsRelease.java@e7fd8adb5f9c |
children |
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/* * Copyright 2012-2017 Red Hat, Inc. * * This file is part of Thermostat. * * Thermostat is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published * by the Free Software Foundation; either version 2, or (at your * option) any later version. * * Thermostat is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Thermostat; see the file COPYING. If not see * <http://www.gnu.org/licenses/>. * * Linking this code with other modules is making a combined work * based on this code. Thus, the terms and conditions of the GNU * General Public License cover the whole combination. * * As a special exception, the copyright holders of this code give * you permission to link this code with independent modules to * produce an executable, regardless of the license terms of these * independent modules, and to copy and distribute the resulting * executable under terms of your choice, provided that you also * meet, for each linked independent module, the terms and conditions * of the license of that module. An independent module is a module * which is not derived from or based on this code. If you modify * this code, you may extend this exception to your version of the * library, but you are not obligated to do so. If you do not wish * to do so, delete this exception statement from your version. */ package com.redhat.thermostat.common.portability.internal.linux; import java.io.BufferedReader; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStreamReader; import java.nio.charset.StandardCharsets; public class EtcOsRelease implements DistributionInformationSource { private static final String EMPTY_STRING = ""; private static final String OS_RELEASE = "/etc/os-release"; private final String osReleaseFile; EtcOsRelease() { this.osReleaseFile = OS_RELEASE; } // package-private for testing EtcOsRelease(String osReleaseFile) { this.osReleaseFile = osReleaseFile; } @Override public DistributionInformation getDistributionInformation() throws IOException { return getFromOsRelease(); } DistributionInformation getFromOsRelease() throws IOException { return getFromOsRelease(osReleaseFile); } DistributionInformation getFromOsRelease(String releaseFile) throws IOException { try (BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(releaseFile), StandardCharsets.UTF_8))) { return getFromOsRelease(reader); } } DistributionInformation getFromOsRelease(BufferedReader reader) throws IOException { String version = DistributionInformation.UNKNOWN_VERSION; String name = DistributionInformation.UNKNOWN_NAME; String line = null; while ((line = reader.readLine()) != null) { // skip whitespace only lines line = line.trim(); if (line.equals(EMPTY_STRING)) { continue; } if (line.matches("^NAME *=.*")) { name = readShellVariable(line); } if (line.matches("^VERSION *=.*")) { version = readShellVariable(line); } } return new DistributionInformation(name, version); } /** Reads and parses a shell variable declaration: {@code FOO="bar"} * * @return the value of the shell variable */ private String readShellVariable(String line) { // TODO we should try to handle shell quotes better String result = line.substring(line.indexOf("=")+1); result = result.trim(); if (result.startsWith("\"") && result.endsWith("\"")) { result = result.substring(1, result.length()-1); result = result.trim(); } return result; } }