Rework discussion of untar and build.
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Bradley M. Kuhn
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1 changed files with 59 additions and 40 deletions
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@ -402,56 +402,75 @@ require a very specific host system. Even in this case, a
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\hyperref[thinkpenguin-glibc-214-issue]{minor annoyance was found that more
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detailed instructions would address}.
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* The actual building of the source code was completed in the following way:
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** Since the instructions didn't mention a specific distro to use, we ran the
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build on an amd64 Debian 6 machine we had. The only distro requirement was:
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Anyway, since these instructions did not specify a specific host system, the
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investigator simply used his own amd64 Debian 6 desktop system. Before
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beginning, the investigator used the following command:
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To build your own firmware you need to have access to a GNU/Linux system
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(case-sensitive filesystem required).
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\lstset{tabsize=2}
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\begin{lstlisting}[language=bash]
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$ dpkg --list | egrep '^iii' | less
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\end{lstlisting}
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** The README mentioned that:
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to verify that the required packages listed in the README were
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installed\footnote{The \verb0dpkg0 command is a Debian-specific way of
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finding installed packages.}.
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"In order to build firmware images for your router,the
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following needs to be installed :
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gcc, binutils, bzip2, flex, python, perl, make, find,
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grep, diff, unzip, gawk, getopt, libz-dev and libc headers."
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Next, the investigator then extracted the primary source package with the
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following command:
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So we ran "dpkg --list" and confirmed that each package was installed (this
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is indicated by a leading "ii" on the line containing the package). Other
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GNU/Linux distributions may have other ways of determing which packages are
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installed.
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** We then extracted the LibreCMC tarball by running
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"tar --posix -jxpf /media/libreCMC\verb0_0v1\verb0_02\verb0_01\verb0_0SRC/librecmc-v1.2.1.tar.bz2". The
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CD did contain another tarball (librecmc-u-boot.tar.bz2), but there appeared
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to be separate instructions for that (in the u-boot\verb0_0reflash text file in the
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same directory). Having the README be more explicit about this would be nice
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but did not ultimately prevent us from determing the proper steps to execute.
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** The README mentioned the following optional step, which we skipped because
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we did not need to modify the configuration for our initial build:
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\lstset{tabsize=2}
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\begin{lstlisting}[language=bash]
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$ tar --posix -jxpf libCMC/librecmc-v1.2.1.tar.bz2
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\end{lstlisting}
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Please use "make menuconfig" to configure your appreciated
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configuration for the toolchain and firmware. Please note that
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the default configuration is what was used to build the firmware
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image for your router. It is advised that you use this configuration.
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The investigator did notice an additional source release, entitled
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``librecmc-u-boot.tar.bz2''. The investigator concluded upon simple
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inspection that the instructions found in ``u-boot\verb0_0reflash'' were
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specific instructions for that part of the CCS\@. This was a minor
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annoyance, and ideally the ``README'' would list that fact, but the existing
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layout met the reasonable standard that community-oriented GPL enforcers
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typically apply, since the skilled investigator could determine the correct
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course of action with a few moments of study.
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** The next instruction was 'Simply running "make" will build your firmware.'
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So we entered the "librecmc" directory that had been created from the above
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"tar" command and then ran "make". The build took about 40 minutes to run on
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our system. The command used and output from running it are available here:
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The investigator then noted the additional step offered by the ``README'',
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which read:
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\begin{quotation}
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Please use ``make menuconfig'' to configure your appreciated configuration
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for the toolchain and firmware. Please note that the default configuration is
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what was used to build the firmware image for your router. It is advised that
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you use this configuration.
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\end{quotation}
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enforcement-case-studies\verb0_0log-output/thinkpenguin\verb0_0librecmc-complete.log
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This instruction actually goes above and beyond the requirements of GPL\@.
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Specifically, the instruction guides users in their first step toward
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exercising the freedom to modify the software. While the GPL does contain
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requirements that facility the freedom to modify (such as ensuring the CCS is
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in the ``preferred form \hellip for making modifications to it'' form, it
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does not require that you write specific instructions explaining how
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modifications might be undertaken. This instruction therefore exemplifies
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the exceptional quality of this particular CCS\@.
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% FIXME: Above, I'd like to see more ``walk through'' of the step by step
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% instructions. The text is a bit terse: could be expanded to talk more.
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% FIXME(dg): Hopefully the above will suffice. I can expand more/differently if
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% such is desired.
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%FIXME: add a \hyperref to some ``preferred for for modification'' stuff above.
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* It was helpful to know that we could use "make menuconfig" for configuration
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changes, as being able to modify the source is an important part of the GPL's
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requirements. Adding instructions like these shows that the distributor is
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aware of and interested in promoting the spirit of the GPL, by making it
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easier to modify the source than may be strictly required by the GPL's text.
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However, for purposes of the CCS verification process, typically the
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investigator avoids any unnecessary changes to the source code during the
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build process, lest the investigator err and cause the build to fail through
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his own modification, and thus incorrectly identify the CCS as inadequate.
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Therefore, the investigator proceeded to simply run:
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\lstset{tabsize=2}
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\begin{lstlisting}[language=bash]
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$ cd libCMC
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$ make
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\end{lstlisting}
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and waited approximately 40 minutes for the build to complete\footnote{Build
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times will likely vary widely on various host systems}. The investigator
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kept a
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\href{https://gitorious.org/copyleft-org/tutorial/source/master:enforcement-case-studies_log-output/thinkpenguin_librecmc-complete.log}{full
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log of the build}, which is not included herein due its size (approximately
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7.2K of text).
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% FIXME: We should somewhere (perhaps on each step we discuss) talk about
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% what often goes wrong on those steps, and why this is right. As written
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