[ANNOUNCEMENT] new: unison2.31; updated: unison2.27; obsolete: unison2.13, unison2.17
Mon May 4 13:59:00 GMT 2009
There are several updates to the Unison packages for Cygwin:
* unison2.31 is a new package, now available in the archive.
* unison2.27 has been updated. This is just a minor update of the README.Cygwin file.
* unison2.13 and unison2.17 have had their categories changed to _obsolete. As a result, these packages will no longer be visible in the installer, unless you
uncheck the "Hide obsolete packages" checkbox there. These packages will be removed from the Cygwin archive after a few more months, unless I hear that some of
you still need them.
Unison is a file synchronizer for Unix and Windows. It allows two replicas of a collection of files and directories to be stored on different hosts (or
different disks on the same host), modified separately, and then brought up to date by propagating the changes in each replica to the other.
Obsolescence of unison2.13, unison2.17
The current stable and beta versions of Unison are 2.27 and 2.31, respectively. I usually maintain Unison packages of a few versions prior to the current
stable version, because of the problem that different versions of Unison won't talk to each other: if you need to synchronize with a server that's running e.g.
Unison 2.13, then you have to be running 2.13 in order to do that.
However, 2.13 and 2.17 are getting pretty old now. All bug fixes and new features are going into the current stable and beta releases, 2.27 and 2.31. As a way
of determining how far back to maintain old versions, I look at Debian stable, which moves very slowly. I figure that if Debian stable doesn't include a
version any more, then very few people are still using it, or if they are they can easily upgrade. The current version of Unison in Debian stable is 2.27, so
it's time to say goodbye to 2.13 and 2.17.
If you have a continuing need for unison2.13 or unison2.17, please speak up on the Cygwin list. Otherwise they'll be removed from the archive in a few months.
They may still be removed in any case, since there won't be any new releases of them, and you can continue to use your installed packages.
About Unison in Cygwin
Unison is packaged for Cygwin as several independent packages, each providing a version of Unison that is incompatible with the others. You have to run the
same version of Unison on the client and server, or Unison will issue an error message and quit. By installing one or more of these packages side by side, you
can use whichever one you need to synchronize with a particular host. Please read /usr/share/doc/unison*/README.Cygwin for more details.
The unison* packages also install a convenience symlink from /usr/bin/unison to one of the versioned unison executables, e.g. unison-2.27.exe. alternatives(8)
is used to manage the symlink. If the symlink is being managed in "auto" mode, then it will automatically track the highest numbered version of unison that you
have installed. You can override this choice by either changing the symlink manually with ln(1), or, preferably, by using alternatives(8):
alternatives --display unison shows you the installed versions of unison, their priorities, which executable the symlink points to, and whether the symlink is
being managed in "auto" or "manual" mode.
alternatives --config unison presents a menu from which you can choose which version you want to use as the default. This puts the symlink in manual mode.
alternatives --auto unison puts the symlink in automatic mode, where it will always point to the highest numbered version of unison that's installed on your
alternatives --set unison /usr/bin/unison-$V.exe forces the symlink to point to unison-$V.exe, and puts it in manual mode.
Please see alternatives(8) for more details.
Andrew E. Schulman
To update your installation, click on the "Install Cygwin now" link on
the http://cygwin.com/ web page. This downloads setup.exe to your
system. Then, run setup and answer all of the questions.
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