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java.lang.Object org.apache.tools.ant.ProjectComponent org.apache.tools.ant.Task org.apache.tools.ant.dispatch.DispatchTask org.apache.tools.ant.taskdefs.optional.unix.Symlink
public class Symlink
Creates, Deletes, Records and Restores Symlinks.
This task performs several related operations. In the most trivial and default usage, it creates a link specified in the link attribute to a resource specified in the resource attribute. 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 (also specified as included in the fileset) and recreate the links that have been previously recorded for each directory. Finally, it can be used to remove a symlink without deleting the associated resource.
Usage examples:
Make a link named "foo" to a resource named "bar.foo" in subdir:
<symlink link="${dir.top}/foo" resource="${dir.top}/subdir/bar.foo"/>
Record all links in subdir and its descendants in files named "dir.links":
<symlink action="record" linkfilename="dir.links"> <fileset dir="${dir.top}" includes="subdir/**" /> </symlink>
Recreate the links recorded in the previous example:
<symlink action="recreate"> <fileset dir="${dir.top}" includes="subdir/**/dir.links" /> </symlink>
Delete a link named "foo" to a resource named "bar.foo" in subdir:
<symlink action="delete" link="${dir.top}/foo"/>
LIMITATIONS: Because Java has no direct support for
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
ln -s link resource
is not a valid command on the command 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 as links to the canonical resource name.
Therefore the link: link --> subdir/dir/../foo.bar
will be
recorded as link=subdir/foo.bar
and restored as
link --> subdir/foo.bar
.
Field Summary |
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Fields inherited from class org.apache.tools.ant.Task |
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target, taskName, taskType, wrapper |
Fields inherited from class org.apache.tools.ant.ProjectComponent |
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description, location, project |
Constructor Summary | |
---|---|
Symlink()
|
Method Summary | |
---|---|
void |
addFileset(FileSet set)
Add a fileset to this task. |
void |
delete()
Delete a symlink. |
static void |
deleteSymlink(java.io.File linkfil)
Delete a symlink (without deleting the associated resource). |
static void |
deleteSymlink(java.lang.String path)
Delete a symlink (without deleting the associated resource). |
void |
execute()
The standard method for executing any task. |
void |
init()
Initialize the task. |
void |
record()
Record symlinks. |
void |
recreate()
Restore symlinks. |
void |
setAction(java.lang.String action)
Set the action to be performed. |
void |
setFailOnError(boolean foe)
Set failonerror mode. |
void |
setLink(java.lang.String lnk)
Set the name of the link. |
void |
setLinkfilename(java.lang.String lf)
Set the name of the file to which links will be written. |
void |
setOverwrite(boolean owrite)
Set overwrite mode. |
void |
setResource(java.lang.String src)
Set the name of the resource to which a link should be created. |
void |
single()
Create a symlink. |
Methods inherited from class org.apache.tools.ant.dispatch.DispatchTask |
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getAction, getActionParameterName |
Methods inherited from class org.apache.tools.ant.Task |
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bindToOwner, getOwningTarget, getRuntimeConfigurableWrapper, getTaskName, getTaskType, getWrapper, handleErrorFlush, handleErrorOutput, handleFlush, handleInput, handleOutput, isInvalid, log, log, log, log, maybeConfigure, perform, reconfigure, setOwningTarget, setRuntimeConfigurableWrapper, setTaskName, setTaskType |
Methods inherited from class org.apache.tools.ant.ProjectComponent |
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clone, getDescription, getLocation, getProject, setDescription, setLocation, setProject |
Methods inherited from class java.lang.Object |
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equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public Symlink()
Method Detail |
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public void init() throws BuildException
init
in class Task
BuildException
- on error.public void execute() throws BuildException
execute
in class Task
BuildException
- on error.public void single() throws BuildException
BuildException
- on error.public void delete() throws BuildException
BuildException
- on error.public void recreate() throws BuildException
BuildException
- on error.public void record() throws BuildException
BuildException
- on error.public void setOverwrite(boolean owrite)
owrite
- If true overwrite existing links.public void setFailOnError(boolean foe)
foe
- If true throw BuildException on error, else log it.public void setAction(java.lang.String action)
setAction
in class DispatchTask
action
- The action to perform.public void setLink(java.lang.String lnk)
lnk
- The name for the link.public void setResource(java.lang.String src)
src
- The resource to be linked.public void setLinkfilename(java.lang.String lf)
lf
- The name of the file to write links to.public void addFileset(FileSet set)
set
- The fileset to add.public static void deleteSymlink(java.lang.String path) throws java.io.IOException, java.io.FileNotFoundException
This is a convenience method that simply invokes
deleteSymlink(java.io.File)
.
path
- A string containing the path of the symlink to delete.
java.io.FileNotFoundException
- When the path results in a
File
that doesn't exist.
java.io.IOException
- If calls to File.rename
or File.delete
fail.public static void deleteSymlink(java.io.File linkfil) throws java.io.IOException, java.io.FileNotFoundException
This is a utility method that removes a unix symlink without removing the resource that the symlink points to. If it is accidentally invoked on a real file, the real file will not be harmed, but an exception 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 its original name inside a finally block to ensure that the resource is unharmed even in the event of an exception.
linkfil
- A File
object of the symlink to delete.
java.io.FileNotFoundException
- When the path results in a
File
that doesn't exist.
java.io.IOException
- If calls to File.rename
,
File.delete
or
File.getCanonicalPath
fail.
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