@@ -16,7 +16,7 @@
*/
/*
* Since the initial version of this file was deveo lped on the clock on
* Since the initial version of this file was develo ped on the clock on
* an NSF grant I should say the following boilerplate:
*
* This material is based upon work supported by the National Science
@@ -52,10 +52,10 @@ import org.apache.tools.ant.taskdefs.Execute;
/**
* Creates, Records and Restores Symlinks.
*
* <p> This task performs several related operations. In the most trivial,
* and default usage, it creates a link specified in the link atribute to
* a resource specified in the resource atribute. The second usage of this
* task is to traverses a directory structure specified by a fileset,
* <p> This task performs several related operations. In the most trivial
* and default usage, it creates a link specified in the link att ribute to
* a resource specified in the resource att ribute. The second usage of this
* task is to traverse a directory structure specified by a fileset,
* and write a properties file in each included directory describing the
* links found in that directory. The third usage is to traverse a
* directory structure specified by a fileset, looking for properties files
@@ -92,10 +92,10 @@ import org.apache.tools.ant.taskdefs.Execute;
* </pre>
*
* <p><strong>LIMITATIONS:</strong> Because Java has no direct support for
* handling symlinks this task divines them by comparing canonia cal and
* handling symlinks this task divines them by comparing canonical and
* absolute paths. On non-unix systems this may cause false positives.
* Furthermore, any operating system on which the command
* <code>ln -s link resource</code> is not a valid command on the comandline
* <code>ln -s link resource</code> is not a valid command on the comm and line
* will not be able to use action= "delete", action="single" or
* action="recreate", but action="record" should still work. Finally, the
* lack of support for symlinks in Java means that all links are recorded
@@ -109,7 +109,7 @@ import org.apache.tools.ant.taskdefs.Execute;
public class Symlink extends Task {
// Atributes with setter methods
// Att ributes with setter methods:
private String resource;
private String link;
private String action;
@@ -119,19 +119,21 @@ public class Symlink extends Task {
private boolean failonerror;
private static final FileUtils FILE_UTILS = FileUtils.getFileUtils();
/** Initialize the task. */
public void init() throws BuildException {
super.init();
failonerror = true; // default behavior is to fail on an error
overwrite = false; // dev ault behavior is to not overwrite
overwrite = false; // def ault behavior is to not overwrite
action = "single"; // default behavior is make a single link
fileSets = new Vector();
}
/** The standard method for executing any task. */
/**
* The standard method for executing any task.
* @throws BuildException on error.
*/
public void execute() throws BuildException {
try {
if (action.equals("single")) {
@@ -154,7 +156,6 @@ public class Symlink extends Task {
+ "required for action recreate");
return;
}
listOfLinks = loadLinks(fileSets);
keys = listOfLinks.keys();
@@ -188,17 +189,15 @@ public class Symlink extends Task {
Enumeration links, dirs;
if (fileSets.size() == 0) {
handleError("File set identifying links to "
handleError("Fileset identifying links to "
+ "record required");
return;
}
if (linkFileName == null) {
handleError("Name of file to record links in "
+ "required");
return;
}
// fill our vector with file objects representing
// links (canonical)
vectOfLinks = findLinks(fileSets);
@@ -215,7 +214,6 @@ public class Symlink extends Task {
((Vector) byDir.get(parent)).addElement(thisLink);
}
}
// write a Properties file in each directory
dirs = byDir.keys();
while (dirs.hasMoreElements()) {
@@ -237,8 +235,6 @@ public class Symlink extends Task {
+ "name of a parent link");
}
}
// Get a place to record what we are about to write
writeTo = new File(dir + File.separator
+ linkFileName);
@@ -263,11 +259,11 @@ public class Symlink extends Task {
}
/* ********************************************************** *
* Begin Atribute Setter Methods *
* Begin At tribute Setter Methods *
* ********************************************************** */
/**
* The setter for the overwrite atribute. If set to false (default)
* The setter for the overwrite att ribute. If set to false (default)
* the task will not overwrite existing links, and may stop the build
* if a link already exists depending on the setting of failonerror.
*
@@ -278,22 +274,21 @@ public class Symlink extends Task {
}
/**
* The setter for the failonerror atribute. If set to true (default)
* The setter for the failonerror att ribute. If set to true (default)
* the entire build fails upon error. If set to false, the error is
* logged and the build will continue.
*
* @param foe If true throw build e xception on error else log it.
* @param foe If true throw BuildE xception on error else log it.
*/
public void setFailOnError(boolean foe) {
this.failonerror = foe;
}
/**
* The setter for the "action" attribute. May be "single" "multi"
* The setter for the "action" attribute. May be "single", "multi"
* or "record"
*
* @param typ The action of action to perform
* @param typ The action of action to perform.
*/
public void setAction(String typ) {
this.action = typ;
@@ -302,7 +297,7 @@ public class Symlink extends Task {
/**
* The setter for the "link" attribute. Only used for action = single.
*
* @param lnk The name for the link
* @param lnk The name for the link.
*/
public void setLink(String lnk) {
this.link = lnk;
@@ -336,32 +331,29 @@ public class Symlink extends Task {
}
/* ********************************************************** *
* Begin Public Utility Methods *
* Begin Public Utility Methods *
* ********************************************************** */
/**
* Deletes a symlink without deleteing the resource it points to.
*
* <p>This is a convenience method that simply invokes
* <code>deleteSymlink(java.io.File)</code>
* <code>deleteSymlink(java.io.File)</code>.
*
* @param path A string containing the path of the symlink to delete
* @param path A string containing the path of the symlink to delete.
*
* @throws FileNotFoundException When the path results in a
* <code>File</code> that doesn't exist.
* @throws IOException If calls to <code>File.rename</code>
* or <code>File.delete</code> fail.
*/
public static void deleteSymlink(String path)
throws IOException, FileNotFoundException {
File linkfil = new File(path);
deleteSymlink(linkfil);
deleteSymlink(new File(path));
}
/**
* Deletes a symlink without delete ing the resource it points to.
* Deletes a symlink without deleting the resource it points to.
*
* <p>This is a utility method that removes a unix symlink without removing
* the resource that the symlink points to. If it is accidentally invoked
@@ -369,11 +361,11 @@ public class Symlink extends Task {
* will be thrown when the deletion is attempted. This method works by
* getting the canonical path of the link, using the canonical path to
* rename the resource (breaking the link) and then deleting the link.
* The resource is then returned to it' s original name inside a finally
* The resource is then returned to its original name inside a finally
* block to ensure that the resource is unharmed even in the event of
* an exception.
*
* @param linkfil A <code>File</code> object of the symlink to delete
* @param linkfil A <code>File</code> object of the symlink to delete.
*
* @throws FileNotFoundException When the path results in a
* <code>File</code> that doesn't exist.
@@ -389,12 +381,11 @@ public class Symlink extends Task {
if (!linkfil.exists()) {
throw new FileNotFoundException("No such symlink: " + linkfil);
}
// find the resource of the existing link
// find the resource of the existing link:
String canstr = linkfil.getCanonicalPath();
File canfil = new File(canstr);
// rename the resource, thus breaking the link
// rename the resource, thus breaking the link:
String parentStr = canfil.getParent();
File parentDir = new File(parentStr);
@@ -407,15 +398,14 @@ public class Symlink extends Task {
throw new IOException("Couldn't rename resource when "
+ "attempting to delete " + linkfil);
}
// delete the (now) broken link
// delete the (now) broken link:
if (!linkfil.delete()) {
throw new IOException("Couldn't delete symlink: " + linkfil
+ " (was it a real file? is this not a "
+ "UNIX system?)");
}
} finally {
// return the resource to its original name.
// return the resource to its original name:
try {
FILE_UTILS.rename(temp, canfil);
} catch (IOException e) {
@@ -427,9 +417,8 @@ public class Symlink extends Task {
}
}
/* ********************************************************** *
* Begin Private Methods *
* Begin Private Methods *
* ********************************************************** */
/**
@@ -438,7 +427,7 @@ public class Symlink extends Task {
* This method use <code>Properties.store</code>
* and thus report exceptions that occur while writing the file.
*
* This is not jdk 1.1 compatible, but a nt 1.6 is not anymore.
* This is not jdk 1.1 compatible, but A nt 1.6 is not anymore.
*
* @param properties The properties object to be written.
* @param propertyfile The File to write to.
@@ -458,13 +447,7 @@ public class Symlink extends Task {
} catch (IOException ioe) {
throw new BuildException(ioe, getLocation());
} finally {
if (fos != null) {
try {
fos.close();
} catch (IOException ioex) {
log("Failed to close output stream");
}
}
FILE_UTILS.close(fos);
}
}
@@ -472,25 +455,22 @@ public class Symlink extends Task {
* Handles errors correctly based on the setting of failonerror.
*
* @param msg The message to log, or include in the
* <code>BuildException</code>
* <code>BuildException</code>.
*/
private void handleError(String msg) {
if (failonerror) {
throw new BuildException(msg);
} else {
log(msg);
}
log(msg);
}
/**
* Conducts the actual construction of a link.
*
* <p> The link is constructed by calling <code>Execute.runCommand</code>.
*
* @param resource The path of the resource we are linking to.
* @param link The name of the link we wish to make
* @param link The name of the link we wish to make.
*/
private void doLink(String resource, String link) throws BuildException {
@@ -500,34 +480,26 @@ public class Symlink extends Task {
return;
}
if (link == null) {
handleError("Must define the link "
+ "name for symlink!");
handleError("Must define the link name for symlink!");
return;
}
File linkfil = new File(link);
String[] cmd = new String[4];
cmd[0] = "ln";
cmd[1] = "-s";
cmd[2] = resource;
cmd[3] = link;
String[] cmd = new String[] {"ln", "-s", resource, link};
try {
if (overwrite && linkfil.exists()) {
deleteSymlink(linkfil);
}
} catch (FileNotFoundException fnfe) {
handleError("Symlink diss apeared before it was deleted:" + link);
handleError("Symlink disap peared before it was deleted: " + link);
} catch (IOException ioe) {
handleError("Unable to overwrite preexisting link " + link);
handleError("Unable to overwrite preexisting link: " + link);
}
log(cmd[0] + " " + cmd[1] + " " + cmd[2] + " " + cmd[3]);
Execute.runCommand(this, cmd);
}
/**
* Simultaneously get included directories and included files.
*
@@ -535,7 +507,6 @@ public class Symlink extends Task {
* @return A vector of <code>String</code> objects containing the
* included file names and directory names.
*/
private Vector scanDirsAndFiles(DirectoryScanner ds) {
String[] files, dirs;
Vector list = new Vector();
@@ -551,14 +522,13 @@ public class Symlink extends Task {
for (int i = 0; i < dirs.length; i++) {
list.addElement(dirs[i]);
}
return list;
}
/**
* Finds all the links in all supplied filesets.
*
* <p> This method is invoked when the action atribute is is "record".
* <p> This method is invoked when the action att ribute is is "record".
* This means that filesets are interpreted as the directories in
* which links may be found.
*
@@ -576,13 +546,13 @@ public class Symlink extends Task {
*
* @param fileSets The filesets specified by the user.
* @return A vector of <code>File</code> objects containing the
* links (with canonical parent directories)
* links (with canonical parent directories).
*/
private Vector findLinks(Vector fileSets) {
Vector result = new Vector();
// loop through the supplied file sets
// loop through the supplied file sets:
FSLoop: for (int i = 0; i < fileSets.size(); i++) {
FileSet fsTemp = (FileSet) fileSets.elementAt(i);
String workingDir = null;
@@ -604,14 +574,12 @@ public class Symlink extends Task {
+ "fileset skipped");
continue FSLoop;
}
// Get a vector of String with file names that match
// the pattern
// Get a vector of String with file names that match the pattern:
ds = fsTemp.getDirectoryScanner(this.getProject());
links = scanDirsAndFiles(ds);
// Now convert the strings to File Objects
// using the canonical version of the working dir
// using the canonical version of the working dir:
enumLinks = links.elements();
while (enumLinks.hasMoreElements()) {
@@ -620,8 +588,7 @@ public class Symlink extends Task {
+ (String) enumLinks
.nextElement()));
}
// Now loop through and remove the non-links
// Now loop through and remove the non-links:
enumLinks = linksFiles.elements();
@@ -645,13 +612,11 @@ public class Symlink extends Task {
// if failonerror = false, hence the warn and skip.
}
}
enumLinks = removals.elements();
while (enumLinks.hasMoreElements()) {
linksFiles.removeElement(enumLinks.nextElement());
}
// Now we have what we want so add it to results, ensuring that
// no link is returned twice and we have a canonical reference
// to the link. (no symlinks in the parent dir)
@@ -671,11 +636,9 @@ public class Symlink extends Task {
handleError("IOException: " + next + " omitted");
}
}
// Note that these links are now specified with a full
// canonical path irrespective of the working dir of the
// file set so it is ok to mix them in the same vector.
}
return result;
}
@@ -683,14 +646,14 @@ public class Symlink extends Task {
/**
* Load the links from a properties file.
*
* <p> This method is only invoked when the action atribute is set to
* <p> This method is only invoked when the action att ribute is set to
* "multi". The filesets passed in are assumed to specify the names
* of the property files with the link information and the
* subdirectories in which to look for them.
*
* <p> The basic method follwed here is, for each file set:
* <ol>
* <li> Get the canonical version of the dir atribute </li>
* <li> Get the canonical version of the dir att ribute </li>
* <li> Scan for properties files </li>
* <li> load the contents of each properties file found. </li>
* </ol>
@@ -698,14 +661,13 @@ public class Symlink extends Task {
* @param fileSets The <code>FileSet</code>s for this task
* @return The links to be made.
*/
private Properties loadLinks(Vector fileSets) {
Properties finalList = new Properties();
Enumeration keys;
String key, value;
String[] includedFiles;
// loop through the supplied file sets
// loop through the supplied file sets:
FSLoop: for (int i = 0; i < fileSets.size(); i++) {
String workingDir;
FileSet fsTemp = (FileSet) fileSets.elementAt(i);
@@ -722,7 +684,6 @@ public class Symlink extends Task {
+ "task. FileSet skipped.");
continue FSLoop;
}
ds = fsTemp.getDirectoryScanner(this.getProject());
ds.setFollowSymlinks(false);
ds.scan();
@@ -746,11 +707,10 @@ public class Symlink extends Task {
continue FSLoop;
} catch (IOException ioe) {
handleError("Unable to open " + includedFiles[j]
+ " or it' s parent dir"
+ " or its parent dir"
+ "FileSet skipped.");
continue FSLoop;
}
keys = propTemp.keys();
propTemp.list(System.out);
// Write the contents to our master list of links
Matthew Jason Benson