001 // This file is part of the program FRYSK.
002 //
003 // Copyright 2008, Red Hat Inc.
004 //
005 // FRYSK is free software; you can redistribute it and/or modify it
006 // under the terms of the GNU General Public License as published by
007 // the Free Software Foundation; version 2 of the License.
008 //
009 // FRYSK is distributed in the hope that it will be useful, but
010 // WITHOUT ANY WARRANTY; without even the implied warranty of
011 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 // General Public License for more details.
013 //
014 // You should have received a copy of the GNU General Public License
015 // along with FRYSK; if not, write to the Free Software Foundation,
016 // Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
017 //
018 // In addition, as a special exception, Red Hat, Inc. gives You the
019 // additional right to link the code of FRYSK with code not covered
020 // under the GNU General Public License ("Non-GPL Code") and to
021 // distribute linked combinations including the two, subject to the
022 // limitations in this paragraph. Non-GPL Code permitted under this
023 // exception must only link to the code of FRYSK through those well
024 // defined interfaces identified in the file named EXCEPTION found in
025 // the source code files (the "Approved Interfaces"). The files of
026 // Non-GPL Code may instantiate templates or use macros or inline
027 // functions from the Approved Interfaces without causing the
028 // resulting work to be covered by the GNU General Public
029 // License. Only Red Hat, Inc. may make changes or additions to the
030 // list of Approved Interfaces. You must obey the GNU General Public
031 // License in all respects for all of the FRYSK code and other code
032 // used in conjunction with FRYSK except the Non-GPL Code covered by
033 // this exception. If you modify this file, you may extend this
034 // exception to your version of the file, but you are not obligated to
035 // do so. If you do not wish to provide this exception without
036 // modification, you must delete this exception statement from your
037 // version and license this file solely under the GPL without
038 // exception.
039
040 package frysk.sysroot;
041
042 import java.io.File;
043
044 /**
045 * Map from a Task's executable to its special root directory.
046 */
047
048 public class SysRoot {
049 private File sysRoot;
050
051 public SysRoot (File path) {
052 sysRoot = path;
053 }
054
055 public SysRoot (String string) {
056 sysRoot = new File(string);
057 }
058
059 /**
060 * return a pathname of an executable.
061 *
062 * @param pathname
063 * is the executable.
064 * @return this executable's pathname, searched for on $PATH in the special
065 * root directory.
066 */
067 public SysRootFile getPathViaSysRoot (String pathname) {
068 String pathVar = System.getenv("PATH");
069 return new SysRootFile(sysRoot, findExe(pathVar, pathname));
070 }
071
072 /**
073 * return a pathname of an executable in a system root. Used only for testing.
074 */
075 SysRootFile getPathViaSysRoot (String pathname, String pathVar) {
076 return new SysRootFile(sysRoot, findExe(pathVar, pathname));
077 }
078
079 /**
080 * return a pathname of an executable's source.
081 *
082 * @param pathname
083 * is the executable's compilation directory.
084 * @param file
085 * this executable's source name.
086 * @return the pathname of the executable's source searched for in the
087 * special root directory.
088 */
089 public SysRootFile getSourcePathViaSysRoot (File compilationDir, File f) {
090 if (! f.isAbsolute())
091 // The file refers to a path relative to the
092 // compilation directory, so prepend that directory path.
093 return new SysRootFile(sysRoot, new File(compilationDir, f.getPath()));
094 else
095 return new SysRootFile(sysRoot, f);
096 }
097
098 /**
099 * return a pathname of an executable.
100 *
101 * @return this executable's library pathname, in the special
102 * root directory.
103 */
104 public String getLibPathViaSysRoot () {
105 String libraryPath = "";
106 if (! sysRoot.equals("/")) {
107 if (new File(sysRoot, "/lib").exists())
108 libraryPath += sysRoot + "/lib:";
109 if (new File(sysRoot, "/usr/lib").exists())
110 libraryPath += sysRoot + "/usr/lib";
111 }
112
113 return libraryPath;
114 }
115
116
117 private File findExe(String pathVar, String arg0) {
118 File exeFile = new File(arg0);
119 if (pathVar == null) {
120 return exeFile;
121 }
122
123 if (arg0.startsWith(File.separator)) {
124 return exeFile;
125 }
126
127 String[] path = pathVar.split(":");
128 if (path == null) {
129 return exeFile;
130 }
131
132 // Given "./executable" with sysroot "/"
133 if (sysRoot.getPath().compareTo(File.separator) == 0) {
134 if (! exeFile.isAbsolute()
135 && exeFile.getPath().indexOf(File.separator) != -1
136 && exeFile.exists()) {
137 return exeFile;
138 }
139 }
140
141 // Otherwise search in $PATH
142 for (int i = 0; i < path.length; i++) {
143 File file = new File(new File(sysRoot.getPath(), path[i]), arg0);
144 if (file.exists()) {
145 return new File(path[i], arg0);
146 }
147 }
148 return new File(arg0);
149 }
150 }