procps 3.32 Debian packages

Following up from the upstream release of a new procps, the Debian packages have also been updated. This upload has a significant change in that, I hope, procps is now multi-arch compliant. To make this happen, the libprocps library is now in it’s own package, separate from the binaries. It also means that if you have programs not from procps that link to this library they are now broken. I put in a Breaks: line for the three I know about (xmem, guymager and open-vm-tools) which will need a recompile with a small tweak in the control file and linked statements.

As suggested in the multi arch implementation wiki page, I tested the libprocps0-dev package by compiling something against it, in this case another Debian package xmem. Doing this was very useful for teasing out some bugs on the dev package itself that did not appear while linking the library to the procps binaries.

In short, the new procps has a lot fewer patches than the old ones and the next version will have less as I have already included the current changes into the upstream git repository. The main differences are now

  • freebsd linux version is read from a file not from uts
  • includes use __restrict not the auto make defined restrict which may not be present in third party packages
  • libnucrsesw conditionally linked with watch for 8bit watch

The three are really bugs, especially the last, which is why the patches will disappear next release.

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procps-ng version 3.3.2 released

procps-ng version 3.3.2 was released today.  This version fixes some bugs introduced in version 3.3.1 as well as a number of enhancements. Below is the most significant set of changes that 3.3.2 brings.

NLS

The most visible change is that procps-ng is now international.  The NLS changes took a long windy path but we got there in the end. This means all procps-ng programs can now use standard gettext PO files to output in any supported language.  While the programs have been enabled for translations, there are no po files as yet but we expect them to follow soon.

Library Changes

procps always had a “closed” library, meaning that it wasn’t supposed to be used for other non-procps programs.  This meant the library was always called libprocps-(version) rather than using a SONAME. Procps 3.3.2 now uses a SONAME of version 0.0.0 The API hasn’t changed but it will be in subsequent versions.

Patch Backporting

Due to the stagnant natute of procps development in the past, there have been a large number of patches each distribution carries for procps. A significant number of patches have been incorportated into procps-ng, giving a more consistent look across the distributions and meaning any subsquent fixes or enhancements are done in one place.  A major goal of procps-ng was to reduce the number of distribution specific patches which this change has helped greatly.

Debian Packages

The Debian packages will be worked on soon and will clear up some confusion about the procps binaries and library packages as this will now be split into two.  It also means that some programs that depend on libprocps will break, but going on from this point will be able to use the normal shlibs process to manage that, rather than the ugly crunch we will have now.

 

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When a dynamic library and program share functions

This is about making procps have a proper library but it really is a generic sort of question.  Say you are making a library and a program that uses that library.  Now at times you may have convience type functions; procps has them for things like escaping command names or allocation different sorts of memory.  Both the library and the programs use some of these functions.

Now, there seems only two approaches to this setup.  The first is to have the function stay in the library and for the program to call this function, just like all the other library functions.  But this means the library has exposed for all other programs that link to it and that doesn’t really make a lot of sense.

The second method is to have the functions defined in both places, perhaps in a file that is linked with the program and the library.  That seems to be duplicating the code in two different places.  Namespace collision could be a problem but that easily fixed with using some unqiue prefix.  I really don’t think having procfs_malloc, procfs_calloc and procfs_strdup are that useful.

I’m sure this sort of problem has been solved elsewhere.  Has anyone else come across this? The functions are simple utility type functions such as malloc a block of memory, if there is a problem print to stderr.

 

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procps-ng 3.3.1 released

Procps-ng, the Debian, Fedora and OpenSuSE fork of procps had another release today.  This is a bugfix release that fixes some important bugs that have cropped up in 3.3.0

pgrep crashes, pgrep -u not finding processes and a problem with top forest view have all been fixed.

An important addition to this release is that test scripts have now been added using the Dejagnu framework.  This framework tests most of the programs that ship with procps-ng.  There is only 100 tests so far and they are only tested for Linux architecture, but we expect to increase this test count and sophistication with each release.

The test scripts even found long-present but unknown bugs in the package. For example, running ps with output flags around the signal masks work as expected in Linux, but fail on kFreeBSD.  This is due to the unusual output of the relevant lines on that architecture. This is not a new bug, bug has been around for quite some time; noone ever noticed (or reported) it.

 

The Debian package has already been built and uploaded to the master FTP server.

Oh, and it is the first package with my new GPG key!

 

 

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New procps 3.3.0 for Debian

Coming soon after the upstream procps 3.3.0 being released, the Debian packages have been uploaded tonight.  The Debian packages have had the added benefit of being a day late by having a tiny 2 line patch to stop pgrep from crashing.

One regression that is on purpose, watch is currently not 8-bit clean again until I can sort out how to get the linking right with the new build process.

 

Testing Systems

The embarrassing problem with pgrep did start a discussion about testing, especially regression testing.  I’ve recently started using unit testing in my python programs and love the level of assurance those tests give me that I haven’t broken anything (to a degree anyhow). I’d really like to be able to type “make test” and have each of the programs run through a series of tests.

The problem with packages like procps (psmisc too) is that you really need to test the entire program, not just a stub, and that the program needs access to a know level of /proc.  The only thing I have seen that is even remotely what is needed is the bunch of scripts that coreutils uses which creates dummy files and directories to operate the commands on.  I expect we could do something similar with some scripts that create a known process but if anyone has a better idea about how to test a command line program let me know.

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