Mercurial > hg > release > thermostat-0.9
view system-backend/src/main/java/com/redhat/thermostat/backend/system/ProcessUserInfoBuilder.java @ 1102:8757e35030f2
Add user ID to VmInfo and display in clients
This commit adds user ID information to the VmInfo Pojo, which is
gathered by SystemBackend. The UID for a VM is collected by parsing
/proc/${pid}/status, and we then get the username for the UID from the
native function getpwuid_r. Both the vm-info command and the VM Overview
tab of the Swing GUI now show the user under Process Information. I took
inspiration from the id Unix program for the formatting, which is
"uid(username)". The native component of this commit is added to
agent-core for use by system-backend, this was done on request by Mario
since agent-core already has a native component for getting the
hostname. I made this component an OSGi service primarily to hide its
implementation details.
Reviewed-by: omajid, jerboaa
Review-thread: http://icedtea.classpath.org/pipermail/thermostat/2013-May/006674.html
author | Elliott Baron <ebaron@redhat.com> |
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date | Tue, 21 May 2013 12:43:17 -0400 |
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/* * Copyright 2012, 2013 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.backend.system; import java.io.BufferedReader; import java.io.IOException; import java.io.Reader; import java.util.logging.Level; import java.util.logging.Logger; import com.redhat.thermostat.common.utils.LoggingUtils; import com.redhat.thermostat.utils.ProcDataSource; import com.redhat.thermostat.utils.username.UserNameUtil; class ProcessUserInfoBuilder { private static final ProcessUserInfo NON_EXISTENT_USER = new ProcessUserInfo(); private static final String PROC_STATUS_UID = "Uid:"; private static final Logger logger = LoggingUtils.getLogger(ProcessUserInfoBuilder.class); private ProcDataSource source; private UserNameUtil userNameUtil; ProcessUserInfoBuilder(ProcDataSource source, UserNameUtil userNameUtil) { this.source = source; this.userNameUtil = userNameUtil; } static class ProcessUserInfo { private long uid; private String username; ProcessUserInfo(long uid, String username) { this.uid = uid; this.username = username; } ProcessUserInfo() { this.uid = -1; this.username = null; } public long getUid() { return uid; } public String getUsername() { return username; } } ProcessUserInfo build(int pid) { ProcessUserInfo info = NON_EXISTENT_USER; try { Reader reader = source.getStatusReader(pid); long uid = getUidFromProcfs(new BufferedReader(reader)); String name = userNameUtil.getUserName(uid); info = new ProcessUserInfo(uid, name); } catch (IOException e) { logger.log(Level.WARNING, "Unable to read user info for " + pid, e); } return info; } /* * Look for the following line: * Uid: <RealUid> <EffectiveUid> <SavedUid> <FSUid> */ private long getUidFromProcfs(BufferedReader br) throws IOException { long uid = -1; String line; while ((line = br.readLine()) != null) { line = line.trim(); if (line.startsWith(PROC_STATUS_UID)) { String[] parts = line.split("\\s+"); if (parts.length == 5) { try { // Use Real UID uid = Long.parseLong(parts[1]); } catch (NumberFormatException e) { throw new IOException("Unexpected output from ps command", e); } } else { throw new IOException("Expected 5 parts from split /proc/${pid}/status output, got " + parts.length); } } } if (uid < 0) { throw new IOException("Unable to determine UID from /proc/${pid}/status"); } return uid; } }