Hi All,
Attached is an updated version of the task, which supports linking
into named directories (currently only a single source file can be
named, filesets are coming).
Cheers,
Marcus
On Wed, 18 Apr 2001, Marcus Crafter wrote:
> Hi All,
>
> Attached is a simple link task which allows you to create unix
> links from ant build files. It supports both hard and symbolic links.
>
> I'm definitely an ant beginner - so please feel free to point out any
> mistakes. I want to learn the right way to do things.
>
> Couple of questions - how do we handle platform specific tasks like
> this ? (ie. is it acceptable for general consumption ?, core or
> optional, or neither ?).
>
> I'm intending to add support for target directories as well.
>
> ie. ln TARGET-0...[TARGET-N] DIRECTORY
>
> and the option of removing existing destination files, if people would
> find that useful ?
>
> Any implementation ideas for non UNIX platforms ??
>
> Cheers,
>
> Marcus
>
>
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package org.apache.tools.ant.taskdefs;
import java.io.*;
import org.apache.tools.ant.*;
import org.apache.tools.ant.types.Commandline;
/**
* Task to create a link (optionally symbolic) from one file to another.
*
* @author [EMAIL PROTECTED]
*/
public class Link extends Task {
public void setFile(File src) {
this.src = src;
}
public void setToFile(File dest) {
this.destfile = dest;
}
public void setToDir(File dest) {
this.destdir = dest;
}
public void setSymbolic(boolean symbolic) {
this.symbolic = symbolic;
}
public void execute() throws BuildException {
if (src == null || !src.exists()) {
throw new BuildException(
"The file attribute must be present, and name an existing file",
location
);
}
if ((destdir != null && destfile != null) ||
(destdir == null && destfile == null))
{
throw new BuildException(
"Either toDir or toFile must be specified as link targets",
location
);
}
if (destdir != null) // directory target checks
{
if (!destdir.isDirectory())
throw new BuildException(
"toDir must be the name of an existing directory.", location
);
String linkname =
destdir.getPath() + File.separator + src.getName();
if (new File(linkname).exists())
throw new BuildException(
"target " + linkname + " already exists.", location
);
}
else // file target checks
{
if (destfile.exists())
throw new BuildException(
"toFile must name a file which does not exist.", location
);
}
File target = destfile == null ? destdir : destfile;
log("Linking " + src + (symbolic ? ", symbolically" : "") +
(destfile == null ? " into directory " : " to ") +
target, Project.MSG_INFO
);
linkFile(src, target, symbolic);
}
private void linkFile(File from, File to, boolean symbolic)
throws BuildException {
Commandline link = new Commandline();
link.setExecutable("ln");
if (symbolic)
link.createArgument().setValue("-s");
link.createArgument().setFile(from);
link.createArgument().setFile(to);
Execute ex =
new Execute(
new LogStreamHandler(
this, Project.MSG_INFO, Project.MSG_WARN
), null
);
ex.setCommandline(link.getCommandline());
try {
ex.execute();
} catch (IOException e) {
throw new BuildException(e);
}
}
private File src;
private File destfile;
private File destdir;
private boolean symbolic = true;
}
