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watersb
Apprentice
Joined: 04 Sep 2002
Posts: 297
Location: take a left turn in Tesuque
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 Posted: Fri Apr 11, 2003 7:00 am Post subject: Portage Dependency Tracing |
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You have just typed emerge -pu --deep world and all this stuff appears -- wow! You might ask:
What are all those pacakages for? Try emerge search <pkgname>
Why does it want to install a particular package? That is, where is a particular pacakge's dependency coming from?
This tip suggests a technique for dealing with the second question - where is the dependency for a package coming from?
For a third question -- Geez, do I have to install all this right now? -- you can find out how to defer unwanted packages during an "emerge -pu world", with this excellent tip.
I use the qpkg tool that is part of gentoolkit. But qpkg does not always help me...
You can dump a list of all currently-installed packages in a number of ways; one is to perform "emerge -pe world". The one that I use is to dump all entries in /var/db/pkg to a text file, like this:
| Code: |
# cd /var/dg/pkg
# find . -type d -mindepth 2 | sort > /tmp/packages-installed
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Tonight I've been using this in conjunction with a little script that searches the package deps for entries:
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#! /bin/bash
cd /var/cache/edb/dep
find . -type f | xargs grep -l $1 | sort > /tmp/pkgs-depending-on-$1
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This gives a listing of all the dependencies for every package that is currently in portage, I think; anyway there are way more things in there than I have installed. And note that this will grab anything that matches lexically; that is, by package name.
Save this script in a file called "pkgdep", and then call it like:
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$ pkg-dep pilot-link
$ cat /tmp/pkfs-depending-on-pilot-link
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To answer a question like, "Why is package X getting added?", I've been doing cross-comparisons, searching through all the deps for package X against all of my currently-installed packages:
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for pkg in `cat /tmp/packages-installed`
do
grep $pkg /tmp/pkgs-depending-on-pilot-link
done
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Using this technique is geared towards giving you false-positives; matches occur lexically, and may not be meaningul. I do this because I find that qpkg does not always give me results that I need; I'll read up on qpkg more...
Anyway, I have found this technique useful for sussing out package dependencies, and maybe it will help. |
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mattsteven
Apprentice
Joined: 27 Oct 2003
Posts: 240
Location: Your Planet
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| Posted: Sun Jul 04, 2004 4:54 pm Post subject: Nicely done, this is very useful when bundled into a sin |
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this is very useful for solving the "why are all these unneccesary packages being installed" problem when bundled into a single script!
| Code: |
#!/bin/bash
if [ ! $1 ] ; then
echo "Usage: $0 packagename"
exit 1
fi
if [ ! -f /tmp/packages-installed ] ; then
cd /var/db/pkg
find . -type d -mindepth 2 | sort > /tmp/packages-installed
fi
cd /var/cache/edb/dep/
find . -type f | xargs grep -l $1 | sort > /tmp/pkgs-depending-on-$1
for pkg in `cat /tmp/packages-installed`
do
grep $pkg /tmp/pkgs-depending-on-$1
done
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Matthew Steven
Linux-only desktop since 1998
Graying hair since 2006 |
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