PKG_NG: pkg deinstall fails with "argument list too long"

[Baptiste Daroussin]

On Tue, Aug 28, 2012 at 11:14:55AM +0200, Stefan Esser wrote:
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> Am 27.08.2012 23:23, schrieb Baptiste Daroussin:
> > On Mon, Aug 27, 2012 at 10:22:27PM +0200, olli hauer wrote:
> 
> Please do not hijack this thread, even if you are also reporting a
> problem with PKG_NG. Threads are free and nobody bothered to reply
> to the more urgent problem of the failed deinstallation.
> 
> >> On 2012-08-27 20:03, Stefan Esser wrote:
> >>> PKG_NG seems to have introduced a limit on the size of ports
> >>> that can be deinstalled:
> >>> 
> >>> # cd /usr/ports/math/lapack #  make deinstall ===>
> >>> Deinstalling for math/lapack ===>   Deinstalling
> >>> lapack-3.4.0_2 The following packages will be deinstalled:
> >>> 
> >>> lapack-3.4.0_2
> >>> 
> >>> The deinstallation will free 28 MB Deinstalling
> >>> lapack-3.4.0_2...lapack-3.4.0_2 is required by: qrupdate-1.1.1,
> >>> deleting anyway pkg: Cannot run script(DEINSTALL): Argument
> >>> list too long *** [deinstall] Error code 3
> 
> I have located the line that is causing this error. It is the
> posix_spawn on line 102 of libpkg/script.c. The argument length
> is limited to KERN_ARGMAX (sysctl kern.argmax) which seems to
> be a R/O value initialized to 256KB.
> 
> AFAICT this is not even a loader tuneable. A new kernel must
> be built, or pkg must be modified to honor the argument length
> limit.
> 
> The argument is the string argument of "sh -c <string>", which
> can not be split in the general case.
> 
> In the specific case of math/lapack, the arguments to execve()
> (called by posix_spawn()) are:
> 
> argv[0] = "sh"
> argv[1] = "-c"
> argv[2] = " set -- lapack-3.4.0_2
> rm -f /usr/local/man/cat3/INSTALL_ilaver.f.3.gz ...
> /usr/local/man/cat3/zupmtr.f.3.gz.bz2"
> 
> The argument list must be broken into pieces of less than 256KB,
> since rising KERN_ARGMAX to >330KB will lead to the same problem
> with the next port with even longer PLIST.
> 

Thank you very much, this is already known and being worked on.

btw the cat3 lines in plist do not longer exists in the ports tree, I removed
this ugly thing a while ago now.

what will be done is keeping the currently behaviours if the script allows it,
and switch to the slower sh -s whan the script is longer.

regards,
Bapt
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