perlquestion
tphyahoo
Monks, I'm installing ImageMagick from source on a large number of machines. I have everything automated, except there's a small tweak to /etc/ld.so.conf that I am still doing by hand. I was just wondering if there was a way to automate that away as well.
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This install from source and tweak /etc/ld.so.conf process is something I have to do for a number of dependencies, not just for imagemagick, so I will wind up with a number of scripts that look kind of like the one below.
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So basically I need to add a line to a conf file, but I shouldn't add it if it's already there. I can think of many ways to do it, but wonder if there's one way that is particularly sweet and easy... you know... a one liner :)
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I'm thinking perl, but if there's a way to do this with bash or sed or howsoever, fine with that as well.
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As a bonus, here's my automated install of ImageMagick. If anybody has comments or improvements, fire away.
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Oh, and before suggesting to me that I do "apt-get -y install perlmagick", that won't work for me in my situation, because it's a locally installed perl in a delicate state.
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<code>
cat install-imagemagick.sh
#!/bin/bash
su -c '(
# uncomment the following line if you need to get the file
#wget 'http://downloads.sourceforge.net/imagemagick/ImageMagick-6.3.0-5.tar.gz'
tar -xzvf ImageMagick-6.3.0-5.tar.gz
cd ImageMagick-6.3.0
./configure
make
make install
cd -
rm -rf ImageMagick-6.3.0
)' 2>&1 | tee installImageMagickOut.txt
echo "
*****************************************************************
image magic should be installed from source.
now let's test if perl -MImageMagick works
you may get errors about a missing .so file
if this happens, try doing ( updatedb; locate the-so-file.so; )
then change /etc/ld.so.conf to include the directory containing that file
then do ldconfig and try again
*****************************************************************
"
/usr/local/path/to/custom/perl -MImage::Magick -e ''
</code>
UPDATE: Thanks to [mk] for putting me on the right track :) Her solution was good, but it inserted lines rather than tacking them on at the end, which bugged me aesthetically.
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I played around with her solution and some other ideas, and finally have something that I like. In the end, a combinatino of bash and perl seemed like the most natural solution to me. Hope this isn't too much of an obfu :) :
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UPDATE 2: (deleted update 1)
For those that still care, VSarkiss pointed me towards a less boneheaded way of doing this. My final result:
<code>
$ cat so-config-imagemagick.sh
#!/bin/bash
./so-config-from-subdir.sh
if [ ! -f /etc/ld.so.conf.d/imagemagick.conf ];
then echo /usr/local/lib >> /etc/ld.so.conf.d/imagemagick.conf
ldconfig
fi
result=`/usr/angebote/perlroot/bin/perl -MImage::Magick -e ''`
if [ -n "$result" ];
then
echo result: $result
exit
echo
"seems there was a problem configuring shared libraries for image magick
running /usr/angebote/perlroot/bin/perl -MImage::Magick -e '' resulted in error
$result
if you got an error about a missing .so file, try doing ( updatedb; locate the-so-file.so; )
then change /etc/ld.so.conf to include the directory containing that file
then do ldconfig and try again
"
fi
$ cat so-config-from-subdir.sh
#!/bin/bash
# if we aren't reading from the ld.so.conf.d subdir, start doing so
# if the result of the grep is a zero length string
config_from_subdir=`grep 'include /etc/ld.so.conf.d/\*.conf' /etc/ld.so.conf`;
if [ -z "$config_from_subdir" ];
then
echo 'include /etc/ld.so.conf.d/*.conf' >> /etc/ld.so.conf
fi
mkdir -p /etc/ld.so.conf.d
$
</code>