[gentoo-user] Is binary emerge equivalent to source emerge?

[gentoo-user] Is binary emerge equivalent to source emerge?

[Ian Clowes]

Hi

I've been building a box for a specific purpose by emerge-ing and playing 
with various packages until I ended up with something that matched what I 
wanted.

I'd now like to rebuild the box including just the packages that turned out 
to be relevant.

Rather than do source installs again I was thinking of using the current box 
to build binary packages before wiping it and doing a rebuild from these 
binaries, hence saving on heaps of build time after setting make.conf, etc. 
to match the current install.  One additional step that I think is important 
is to use a Portage snapshot from the current machine.

A few questions...

1) Does this seem like a sensible idea?  Will it generally work?
2) Will --usepkg --getbinpkg use binary packages for dependencies?
3) Is the resultant Portage database equivalent to source emerges, 
especially in respect of future --updates, --newuse, etc?
4) Am I right to use a Portage snapshot from the current machine?
5) Is this idea so close to the Catalyst idea that I should use its methods 
to achieve my aims?

TIA
IanC


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Re: [gentoo-user] Is binary emerge equivalent to source emerge?

[Zac Medico]

Sascha Lucas wrote:
>   - -uD --newuse --usepkg world (binary if possible, else ebuild) does not
>     work very well

I've also had problems with --usepkg.  When it gives me problems, as a workaround, I force emerge to do what I want with emerge --usepkgonly --nodeps --oneshot for each and every binpkg that I want merged.  If I think that this may have broken something then afterwards I use "revdep-rebuild -p" to check linking integrity.

Zac
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Re: [gentoo-user] Is binary emerge equivalent to source emerge?

[Sascha Lucas]

Hi Ian,

> 1) Does this seem like a sensible idea?  Will it generally work?
> 2) Will --usepkg --getbinpkg use binary packages for dependencies?
> 3) Is the resultant Portage database equivalent to source emerges, especially 
> in respect of future --updates, --newuse, etc?
> 4) Am I right to use a Portage snapshot from the current machine?
> 5) Is this idea so close to the Catalyst idea that I should use its methods 
> to achieve my aims?

I'm answering to your thread, because I'm also playing with binary merges. 
At the moment I'm not realy happy with it. I've played with catalyst/GRP, 
PORTAGE_BINHOST (aka --getbinpkg), PKGDIR via nfs (aka --usepkg).

Perhaps there is someone out there who can point me to some docs etc. Or 
correct my following statments:

to 1)
  - yes it will work
  - you have 3 choices how to build your binarys
    * GRP with catalyst (usefull if your USE-/CFLAGS-Falgs etc. on the
      build system and target system differ)
    * quickpkg from allready installed ebuilds
    * FEATURES="buildpkg" in make.conf (creates bin's on merge)
  - the last 2 are usefull if your USE-/CFLAGS-Flags are identical or do
    not differ much

  - what you need is:
    * portage-snapshot (can be done with catalyst)
    * stage3 from internet or actual build with catalyst
    * binarys build with USE-/CFLAGS-Flags you want on the target

to 2)
   - yes binarys are used for deps
   - --usepkg looks for binarys in PKGDIR=${PORTDIR}/packages
   - --getbinpkg looks for binarys on PORTAGE_BINHOST (I tried ftp)
   - both have a "only" variant which should use only binarys
   - the only-variants doesn't make me happy, because they seem to ignore
     different USE-Flags

to 3)
   - if you mean /var/db/pkg then yes it's the same
   - updates seem to work (-kuD world)
   - -uD --newuse world (ebuild only) works
   - -uD --newuse --usepkg world (binary if possible, else ebuild) does not
     work very well

to 4 and 5) may be something in my comments to 1-3.

Perhaps I'm doing something wrong.... then please tell me the better way.

THX,

Sascha.
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Re: [gentoo-user] Is binary emerge equivalent to source emerge?

[Zac Medico]

[-- Attachment #1: Type: text/plain, Size: 852 bytes --]

Sascha Lucas wrote:
>> I've also had problems with --usepkg.  When it gives me problems, as a 
>> workaround, I force emerge to do what I want with emerge --usepkgonly 
>> --nodeps --oneshot for each and every binpkg that I want merged.  If I 
>> think that this may have broken something then afterwards I use 
>> "revdep-rebuild -p" to check linking integrity.
> 
> 
> thats nearly the same like I do: emerge --usepkg --oneshot binpkgs.
> 
> So I assume, I'm not alone with this problem (--newuse & --usepkg & 
> -uD). The question is, is there a missunderstanding or a bug?
> 
> Sascha.

There are a few open bugs related to binpkg handling.  Attached is a script that prints out the use flags of a binpkg (similar to emerge -pv output).  I you believe that you have discovered an unreported bug, then please file a new bug at bugs.gentoo.org.

Zac

[-- Attachment #2: binpkg-use.py --]
[-- Type: text/x-python, Size: 376 bytes --]

#!/usr/bin/python

import sys
if len(sys.argv)!=2:
	print "usage: %s <tbz2 file>" % sys.argv[0]
	sys.exit(1)

sys.path = ["/usr/lib/portage/pym"]+sys.path
import xpak
mytbz2=xpak.tbz2(sys.argv[1])
myuse=mytbz2.getelements("USE")
myiuse=mytbz2.getelements("IUSE")
for use in myiuse:
	operator="-"
	if use in myuse:
		operator="+"
	sys.stdout.write( operator + use + " ")
print

Re: [gentoo-user] Is binary emerge equivalent to source emerge?

[Sascha Lucas]

> I've also had problems with --usepkg.  When it gives me problems, as a 
> workaround, I force emerge to do what I want with emerge --usepkgonly 
> --nodeps --oneshot for each and every binpkg that I want merged.  If I think 
> that this may have broken something then afterwards I use "revdep-rebuild -p" 
> to check linking integrity.

thats nearly the same like I do: emerge --usepkg --oneshot binpkgs.

So I assume, I'm not alone with this problem (--newuse & --usepkg & -uD). 
The question is, is there a missunderstanding or a bug?

Sascha.
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Re: [gentoo-user] Is binary emerge equivalent to source emerge?

[Sascha Lucas]

> There are a few open bugs related to binpkg handling.  Attached is a script 
> that prints out the use flags of a binpkg (similar to emerge -pv output).  I 
> you believe that you have discovered an unreported bug, then please file a 
> new bug at bugs.gentoo.org.

I did fill a bug report. Bug #105231 if someone is interested.

Sascha.

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