On 2010-02-26 09:27-0800 Alan W. Irwin wrote:
All good ideas are copied. From a google search for svn bisect, it appears
there is now a perl svn-bisect script to do svn bisect plus an "official"
svn-bisect script in the works.
I plan to try the perl script for now to see how fast I can come up
with the answer for which revision caused this regression.
It was something of a struggle to install the App::SVN::Bisect perl module
because of dependencies. I have attached my (extremely Debian-specific)
notes on how to deal with those dependency issues. These notes should be
useful for those here running Debian or a Debian derivative such as Ubuntu.
The next steps are
(1) Update my local svn repository for PLplot. Normally I update that every
few months as a sometimes backup of the SF repo while Maurice does that on a
daily basis as part of an automatic backup script he is running. In this
case I will be using the local repository to greatly improve speed as the
bisect updates to a variety of different revisions.
(2) Write a script to do the steps mentioned in the previous e-mail to
demonstrate the error. This is straightforward, but it needs to be
done for every error where either git-bisect or svn-bisect is to be used
to find the revision that corresponds to introducing the regression.
(3) Check out PLplot from the local repository, set up the svn-bisect range
with
svn-bisect --min good-revision --max bad-revision start
then run
svn-bisect run testscript.sh
to find the bad revision, and
svn-bisect reset
to restore the local version back to normal.
This all seems straightforward, but we will see!
Alan
__________________________
Alan W. Irwin
Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).
Programming affiliations with the FreeEOS equation-of-state implementation
for stellar interiors (freeeos.sf.net); PLplot scientific plotting software
package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of
Linux Links project (loll.sf.net); and the Linux Brochure Project
(lbproject.sf.net).
__________________________
Linux-powered Science
__________________________
Directions for building svn-bisect quoted below come from
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=481858. These directions
should be straightforward to generalize for any perl module.
********
building a App::SVN::Bisect package is quite easy using dh-make-perl
(from the dh-make-perl package).
Just run
dh-make-perl --cpan App::SVN::Bisect
and change to the newly created folder App-SVN-Bisect-0.4
Now edit the debian/control file (created by dh-make-perl) and add the
following to Build-Depends-Indep:
libio-all-perl, libyaml-perl, subversion
and to Depends:
subversion
Now you can build the package with debuild.
********
Additional comments: above did not work because of large number of missing
dependencies. It was so bad, that I had to copy downloaded tarball, unpack
it by hand, then run
dh-make-perl App-SVN-Bisect-1.0
which informed me a number of Debian packages were missing which I installed.
**Also Test::Output was missing.
dh-make-perl --cpan Test::Output
then informed me that
Needed libsub-exporter-perl libtest-tester-perl packages which I installed.
Then
dh-make-perl --cpan Test::Output --build >& build.out
+ (as root)
dpkg --install libtest-output-perl_0.16-1_all.deb
worked fine. Subsequently
dh-make-perl App-SVN-Bisect-1.0 --depends libtest-output-perl --build >&
build.out
+ (as root)
dpkg --install libapp-svn-bisect-perl_1.0-1_all.deb
worked fine.
As did
man svn-bisect
Now, just have to learn how to use that command.------------------------------------------------------------------------------
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