Difference between revisions of "DeveloperWiki:Building in a Clean Chroot"

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[[Category: DeveloperWiki]]
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= Introduction =
 
= Introduction =
  
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= Why =
 
= Why =
  
Building in a clean chroot prevents missing dependancies in packages, whether due to unwanted linking or packages missing in the depends array in the PKGBUILD.  It also allows you to build a package for the stable repositories (core, extra, community) while having packages from [testing] installed on your system.
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Building in a clean chroot prevents missing dependencies in packages, whether due to unwanted linking or packages missing in the depends array in the PKGBUILD.  It also allows users to build a package for the stable repositories (core, extra, community) while having packages from [testing] installed.
 +
 
 +
= Convenience Way =
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To quickly build a package in a chroot without any further tinkering, one can use the helper scripts from the devtools package.
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These helper scripts should be called in the same directory where the PKGBUILD is, just like with makepkg. For instance, {{ic|extra-i686-build}} automatically sets up chroot in {{ic|/var/lib/archbuild}}, updates it, and builds a package for the extra repository. For multilib builds there is just {{ic|multilib-build}} without an architecture.
 +
 
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{{Tip|Consult the table below for information on which script to use when building for a specific repository and architecture.}}
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{{Note|[core] is omitted because those packages are required to go through [testing] first before landing in [core].}}
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{| class="wikitable"
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! Target repository || Architecture || Build script to use
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|-
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| extra / community || i686 || extra-i686-build
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|-
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| extra / community || x86_64 || extra-x86_64-build
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|-
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| testing / community-testing || i686 || testing-i686-build
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|-
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| testing / community-testing || x86_64 || testing-x86_64-build
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|-
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| staging / community-staging || i686 || staging-i686-build
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|-
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| staging / community-staging || x86_64 || staging-x86_64-build
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|-
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| multilib || x86_64 || multilib-build
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|-
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| multilib-testing || x86_64 || multilib-testing-build
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|-
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| multilib-staging || x86_64 || multilib-staging-build
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|}
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= Classic Way =
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== Setting Up A Chroot ==
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The devtools package provides tools for creating and building within clean chroots. Install it if not done already:
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$ pacman -S devtools
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To make a clean chroot, create a directory in which the chroot will reside.  For example, {{ic|$HOME/chroot}}.
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$ mkdir ~/chroot
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Define the {{ic|CHROOT}} variable:
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$ CHROOT=$HOME/chroot
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Now create the chroot (the sub directory {{ic|root}} is required because the {{ic|$CHROOT}} directory will get other sub directories for clean working copies):
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# mkarchroot $CHROOT/root base-devel
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{{Note|One can also define the {{ic|CHROOT}} variable in {{ic|$HOME/.bashrc}} using the export command if the location is to be repeatedly used. }}
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Edit {{ic|~/.makepkg.conf}} to set the packager name and any makeflags.  Also adjust the [[Pacman#Repositories|mirrorlist]] in {{ic|$CHROOT/root/etc/pacman.d/mirrorlist}} and enable the [[Testing#.5Btesting.5D|[testing]]] repository in {{ic|$CHROOT/root/etc/pacman.conf}}, if desired.
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=== Custom pacman.conf ===
  
= Setting Up A Chroot =
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Alternatively, provide a custom {{ic|pacman.conf}} and {{ic|makepkg.conf}} with the following:
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 +
# mkarchroot -C <pacman.conf> -M <makepkg.conf> $CHROOT/root base-devel
  
The devtools package provides tools for creating and building within clean chroots.  To make a clean chroot, firstly create the directory you want it to reside in. For the purposes of this article this will be called <chrootdir>.  The create your chroot using
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{{Warning|
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Using a custom {{ic|pacman.conf}} or {{ic|makepkg.conf}} during the initial creation of clean chroot can result in unintended custom adjustments to the chroot environment. ''Use with caution.''}}
  
sudo mkarchroot -C <pacman.conf> -M <makepkg.conf> <chrootdir>/root base base-devel sudo
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== Building in the Chroot ==
  
The -C and -M flags are optional, but it is recommended to provide these with clean pacman.conf and makepkg.conf files (directly from the pacman package) during first creation of clean chroot to ensure lack of user specific adjustments.
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Firstly, make sure the chroot is up to date with:
  
Edit the <chrootdir>/root/etc/makepkg.conf file to set the packager name and any makeflags. Also adjust the mirror list in <chrootdir>/root/etc/pacman.d/mirrorlist and enable [testing] in <chrootdir>/root/etc/pacman.conf is wanted.
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  sudo arch-nspawn $CHROOT/root pacman -Syu
  
= Building in the Chroot =
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Then, to build a package in the chroot, run the following from the dir containing the PKGBUILD:
  
Firstly, make sure your chroot is up to date with:
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sudo makechrootpkg -c -r $CHROOT
  
sudo mkarchroot -u <chrootdir>/root
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Passing the -c flag to makechrootpkg ensures that the working chroot (named {{ic|$CHROOT/$USERNAME}}) is cleaned before building starts.
  
Then, to build a package in your chroot run
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== Manual package installation ==
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Packages can be installed manually to the working chroot by using:
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sudo makechrootpkg -r $CHROOT -I package-1.0-1-i686.pkg.tar.xz
  
sudo makechrootpkg -c -r <chrootdir>
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If done from a directory that contains a PKGBUILD, the package will then be built. Avoid being in such a directory if you want to just install the package.
  
The -c flag ensures the chroot is cleaned before building starts.
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== Installation after building ==
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Tell makechrootpkg to simply install a package to the rw layer of the chroot after building by passing the -i arg. Unrecognized args get passed to makepkg, so this calls `makepkg` with the -i arg.
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sudo makechrootpkg -r $CHROOT -- -i
  
 
= Handling Major Rebuilds =
 
= Handling Major Rebuilds =
  
The cleanest way to handle a major rebuild is to create a new chroot and build your first package (typically the package you are doing the rebuild for). Then create a local repo in you chroot. To do this:
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The cleanest way to handle a major rebuild is to use the [staging] repositories. Build the first package against [extra] and push it to [staging]. Then rebuild all following packages against [staging] and push them there.
  
sudo mkdir <chrootdir>/root/repo
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If you can't use [staging], you can build against custom packages using a command like this:
sudo chmod 777 <chrootdir>/root/repo
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The chmod statement allows you to copy package files and create the local repo as your user rather than root.
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sudo extra-x86_64-build -- -I ~/packages/foobar/foobar-2-1-any.pkg.tar.xz
  
cp <package> <chrootdir>/root/repo
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You can specify more than one package to be installed using multiple -I arguments.
repo-add local.db.tar.gz <package>
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Then add the local repo to <chrootdir>/root/etc/pacman.conf
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A simpler, but dirtier way to handle a major rebuild is to install all built packages in the chroot, never cleaning it. Build the first package using:
  
  [local]
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  sudo extra-x86_64-build
Server = file:///repo
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and update your repo
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And build all following packages using:
  
  sudo mkarchroot -u <chrootdir>/repo
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  sudo makechrootpkg -n -r /var/lib/archbuild/extra-x86_64
  
With every additional package rebuilt, copy the package to the local repo directory, add it to the repo database and update your chroot.
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Running namcap (the -n argument) implies installing the package in the chroot. *-build also does this by default.

Revision as of 21:23, 28 June 2013


Introduction

This article is part of the DeveloperWiki.

Why

Building in a clean chroot prevents missing dependencies in packages, whether due to unwanted linking or packages missing in the depends array in the PKGBUILD. It also allows users to build a package for the stable repositories (core, extra, community) while having packages from [testing] installed.

Convenience Way

To quickly build a package in a chroot without any further tinkering, one can use the helper scripts from the devtools package.

These helper scripts should be called in the same directory where the PKGBUILD is, just like with makepkg. For instance, extra-i686-build automatically sets up chroot in /var/lib/archbuild, updates it, and builds a package for the extra repository. For multilib builds there is just multilib-build without an architecture.

Tip: Consult the table below for information on which script to use when building for a specific repository and architecture.
Note: [core] is omitted because those packages are required to go through [testing] first before landing in [core].
Target repository Architecture Build script to use
extra / community i686 extra-i686-build
extra / community x86_64 extra-x86_64-build
testing / community-testing i686 testing-i686-build
testing / community-testing x86_64 testing-x86_64-build
staging / community-staging i686 staging-i686-build
staging / community-staging x86_64 staging-x86_64-build
multilib x86_64 multilib-build
multilib-testing x86_64 multilib-testing-build
multilib-staging x86_64 multilib-staging-build

Classic Way

Setting Up A Chroot

The devtools package provides tools for creating and building within clean chroots. Install it if not done already:

$ pacman -S devtools

To make a clean chroot, create a directory in which the chroot will reside. For example, $HOME/chroot.

$ mkdir ~/chroot

Define the CHROOT variable:

$ CHROOT=$HOME/chroot

Now create the chroot (the sub directory root is required because the $CHROOT directory will get other sub directories for clean working copies):

# mkarchroot $CHROOT/root base-devel
Note: One can also define the CHROOT variable in $HOME/.bashrc using the export command if the location is to be repeatedly used.

Edit ~/.makepkg.conf to set the packager name and any makeflags. Also adjust the mirrorlist in $CHROOT/root/etc/pacman.d/mirrorlist and enable the [testing] repository in $CHROOT/root/etc/pacman.conf, if desired.

Custom pacman.conf

Alternatively, provide a custom pacman.conf and makepkg.conf with the following:

# mkarchroot -C <pacman.conf> -M <makepkg.conf> $CHROOT/root base-devel
Warning: Using a custom pacman.conf or makepkg.conf during the initial creation of clean chroot can result in unintended custom adjustments to the chroot environment. Use with caution.

Building in the Chroot

Firstly, make sure the chroot is up to date with:

sudo arch-nspawn $CHROOT/root pacman -Syu

Then, to build a package in the chroot, run the following from the dir containing the PKGBUILD:

sudo makechrootpkg -c -r $CHROOT

Passing the -c flag to makechrootpkg ensures that the working chroot (named $CHROOT/$USERNAME) is cleaned before building starts.

Manual package installation

Packages can be installed manually to the working chroot by using:

sudo makechrootpkg -r $CHROOT -I package-1.0-1-i686.pkg.tar.xz

If done from a directory that contains a PKGBUILD, the package will then be built. Avoid being in such a directory if you want to just install the package.

Installation after building

Tell makechrootpkg to simply install a package to the rw layer of the chroot after building by passing the -i arg. Unrecognized args get passed to makepkg, so this calls `makepkg` with the -i arg.

sudo makechrootpkg -r $CHROOT -- -i

Handling Major Rebuilds

The cleanest way to handle a major rebuild is to use the [staging] repositories. Build the first package against [extra] and push it to [staging]. Then rebuild all following packages against [staging] and push them there.

If you can't use [staging], you can build against custom packages using a command like this:

sudo extra-x86_64-build -- -I ~/packages/foobar/foobar-2-1-any.pkg.tar.xz

You can specify more than one package to be installed using multiple -I arguments.

A simpler, but dirtier way to handle a major rebuild is to install all built packages in the chroot, never cleaning it. Build the first package using:

sudo extra-x86_64-build

And build all following packages using:

sudo makechrootpkg -n -r /var/lib/archbuild/extra-x86_64

Running namcap (the -n argument) implies installing the package in the chroot. *-build also does this by default.