[blfs-dev] Mercurial or wget for openjdk?

Fernando de Oliveira famobr at yahoo.com.br
Sat Sep 5 10:54:34 PDT 2015


Em 05-09-2015 13:40, Bruce Dubbs escreveu:
> Pierre Labastie wrote:
>> Hi all,
>>
>> Sorry for discussing this again, but before the timing given below, I was
>> wondering what the best approach for downloading OpenJDK files was. Using
>> mercurial, it amounts to:
>> ----------
>> hg clone http://hg.openjdk.java.net/jdk8u/jdk8u<rev>
>> cd jdk8u<rev>
>> sh get_source.sh
>> sh common/bin/hgforest.sh update -r jdk8u<rev>-b<build> # not really
>> needed
>> ----------
>> Note that mercurial is needed (obviously), but mercurial depends only on
>> Python, which is a very basic package, and builds very fast (a few
>> tenths of
>> SBU). hgforest is optimized to retrieve several repositories at the
>> same time,
>> so the download time is not too long. Actually, timing gives:
>> -------------
>> time (
>> hg clone http://hg.openjdk.java.net/jdk8u/jdk8u60
>> cd jdk8u60
>> sh get_source.sh
>> sh common/bin/hgforest.sh update -r jdk8u60-b27 )
>> ...
>> real    6m31.868s
>> user    0m0.896s
>> sys     0m0.060s
>>
>> The other approach is to use wget to download tarballs, as proposed by
>> Fernando. For measuring download+unpack time, I use a version slightly
>> different from
>> http://lists.linuxfromscratch.org/pipermail/blfs-dev/2015-May/030258.html:
>>
>> time (
>> PACKAGE=jdk8u60-b27.tar.bz2
>> URL=http://hg.openjdk.java.net/jdk8u/jdk8u60
>> URL_END=archive/$PACKAGE
>> wget $URL/$URL_END
>> tar xf $PACKAGE
>> for additional in corba hotspot jaxp jaxws langtools jdk nashorn; do
>>    wget $URL/$additional/$URL_END -O $additional.tar.bz2
>>    mkdir -p jdk8u60-jdk8u60-b27/$additional
>>    tar --stripcomponents=1 \
>>        -C jdk8u60-jdk8u60-b27/$additional \
>>        -x -f $additional.tar.bz2
>> done
>> )
>> ...
>> real    2m56.273s
>> user    0m8.716s
>> sys     0m2.472s
>>
>> So definitely, the wget approach is shorter. OTOH the mercurial
>> approach is
>> much simpler and less prone to errors. If using wget, I think I'll use
>> some
>> approach similar to what we do for X, as suggested by Fernando, but it
>> would
>> be still complicated, unless maybe we make a file with 4 fields per line:
>> tarball-name, md5 extracted-dirname, final-dirname.
> 
> Using mercurial provides an example for that version control package.  I
> don't wee a problem with doing OpenJDK with mercurial.
> 
> Note, I only build OPenJDK for testing the book.  I cannot recall
> needing or using it in other circumstances.
> 
>   -- Bruce
> 

Why is this result so the expected one?

After forgetting Fernando's suggestion for months, delaying for more
time, waiting BLFS7.8 freeze, and with Bruce playing the game...

Is there a single person that thought the result could be different?

-- 
[]s,
Fernando


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