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On Thu, 2006-08-24 at 10:10 +0200, Arnau Bria wrote: |
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> Thanks for your reply, I have my wireshark running now... |
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> just one more question, how do you know what "feature" provides each |
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> use in a package? |
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> I mean, how did you know wireshark needed gtk, but talking in general... |
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It's quite easy, but sometimes involves some detective work: |
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gentoo linux # emerge -pv wireshark |
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These are the packages that would be merged, in order: |
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Calculating dependencies... done! |
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[ebuild N ] net-analyzer/wireshark-0.99.2 USE="gtk ssl threads |
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-adns -ipv6 -kerberos (-selinux) -snmp" 12,068 kB |
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Total size of downloads: 12,068 kB |
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So it has a gtk USE flag. Tofind out what "gtk" means, you can either |
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look into /usr/portage/profiles/use.desc directly: |
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gentoo linux # cat /usr/portage/profiles/use.desc | grep gtk |
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gtk - Adds support for x11-libs/gtk+ (The GIMP Toolkit) |
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The other way is to use one of the tools in e.g. gentoolkit. I like |
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equery: |
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gentoo linux # equery uses -a wireshark |
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[ Searching for packages matching wireshark... ] |
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[ Colour Code : set unset ] |
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[ Legend : Left column (U) - USE flags from |
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make.conf ] |
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[ : Right column (I) - USE flags packages was installed |
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with ] |
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[ Found these USE variables for net-analyzer/wireshark-0.99.2 ] |
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U I |
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- - adns : Adds support for the adns DNS client library |
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+ + gtk : Adds support for x11-libs/gtk+ (The GIMP Toolkit) |
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Which nicely displays that wireshark USEs gtk, that the current config |
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for it is to enable it, and that it was compiled with that flag enabled. |
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The gtk flag is very common, it's one of those that when you see it in a |
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spec, you know exactly what it's for and what it means. |
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To truly know what the dev has done with the USE flag, check |
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the .ebuild. IUSE tells you which flags are consulted: |
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IUSE="adns gtk ipv6 snmp ssl kerberos threads selinux" |
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The details are in DEPEND or RDEPEND. For wireshark, it's in RDEPEND. |
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>From the ebuild: |
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RDEPEND=">=sys-libs/zlib-1.1.4 |
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gtk? ( >=dev-libs/glib-2.0.4 |
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=x11-libs/gtk+-2* |
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x11-libs/pango |
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dev-libs/atk ) |
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!gtk? ( =dev-libs/glib-1.2* ) |
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Which means that if gtk is set, portage will also emerge glib, gtk+, |
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pango and atk. If gtk is not set, portage will check for glib, but for a |
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lesser version. You can then iteratively check each of those packages to |
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find what they do. Because !gtk doesn't depend on any X packages at all, |
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we can conclude that no gtk flag means it will be compiled as a |
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console-only app. |
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There are probably 100s of other ways to find all this out. :-) |
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Some resources where this is documented: |
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man emerge |
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man 5 portage |
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man 5 make.conf |
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man equery |
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alan |
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-- |
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