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| = About =
| | [[User:Ncopa/Install Handbook]] |
| Alpine Linux is an x86 Linux distribution suitable for firewalls, routers, VPN gateways, lightweight servers (http, sql, mail), resque livecd or other embedded devices.
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| == Lightweight ==
| | [[User:Ncopa/buildmsg]] |
| Alpine is based on and [http://busybox.org busybox] (and are thus not a GNU/Linux distro).
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| The base system, excluding the kernel, is less than 2MB. That includes:
| | [[User:Ncopa/Alpine Mirror with MQTT]] |
| * the C library runtime, [http://uclibc.org uclibc]
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| * standard tools from [http://busybox.net busybox] (cp, ls, mv, wget, iproute, nc etc)
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| * package manager, apk-tools
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| * openrc init system
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| == Proactive security ==
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| The default kernel is patched with the grsecurity patches and provides features like:
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| * Address Space Randomization Layout
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| * Memeory protection
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| Alpine Linux is a run-from RAM linux distribution. Its original target was small appliances like routers, VPN gateways, or embedded x86 devices. However, it supports hosting other Linux guest OSes under [http://linux-vserver.org/ VServer] control, making it an attractive hosting solution as well. | |
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| It can boot from a 1GB USB stick, CDrom, or hard drive. Packages compiled against [http://www.uclibc.org/ uClibc] are pulled into RAM for execution. All packages are compiled with [http://www.grsecurity.net/ grsecurity patches] and [http://en.wikipedia.org/wiki/Stack-smashing_protection SSP] to provide a secure runtime environment.
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| The lbu backup system stores all changes to /etc (and custom changes) to the boot media, making system disaster recovery brain-dead simple.
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| = APKBUILD Reference =
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| APKBUILDs are scripts to build alpine packages using the [[abuild]] tool.
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| == Variables ==
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| The following variables are defined by abuild:
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| ; startdir
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| : The directory where APKBUILD script is found.
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| ; srcdir
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| : The directory here sources are downloaded to and unpacked.
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| ; pkgdir
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| : This directory should hold the data files for main package. A normal autotools package has a ''make DESTDIR="$pkgdir" install''.
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| ; subpkgdir
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| : This directory should have the data files for a subpackage. This variable should only be used from subpackage functions.
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| {{Note|All variables that holds a path (i.e ''$srcdir'' and ''$pkgdir'') should always be within quotes in the APKBUILD (for example: ''"$srcdir"''). This is so things don't break in case user has the APKBUILD in a directory with spaces.}}
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| The following variables should be defined by user in APKBUILD:
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| ; depends
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| : Runtime dependencies that are not shared-object dependencies. Shared objects dependencies are autodetected and should not be specified here.
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| ; depends_dev
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| : Runtime dependencies for -dev subpackage.
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| ; install
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| : pre/post install/deinstall/remove scripts.
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| ; license
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| : License(s) for the package.
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| ; makedepends
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| : Build time dependencies.
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| ; options
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| : build time options for package. Valid values are currently only ''!strip'' for avoid stripping the binaries.
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| ; pkgdesc
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| : Short package description.
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| ; pkggroups
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| : Groups to be created during buildtime. This group should be created in a ''$pkgname.pre-install'' script as well so group is created during runtime.
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| ; pkgname
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| : The name of the package. All letters should be lowercase. Lua libraries/modules should be prefixed with ''lua-'' (for example ''lua-posix''), perl modules with ''perl-'' (for example ''perl-xml-''parser), php modules with ''php-'' and python modules with ''py--''.
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| ; pkgusers
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| : Users to be created during buildtime. Use ''$pkgname.pre-install'' for creating the user(s) during runtime.
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| ; pkgver
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| : The package version.
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| ; replaces
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| : package(s) that this package replaces. Useful when files moves from one package to another.
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| ; source
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| : URL(s) to sources and patches.
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| ; subpackages
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| : Subpackages built from this APKBUILD.
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| ; url
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| : The homepage for the package. This is to help users find upstream developer, documentation etc.
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| == Functions ==
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| The following functions should be specified in the APKBUILD. The functions should consider current work directory as undefined.
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| ; prepare()
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| : ''Optional''. Build preparation. Here should patches etc be applied. This is function is for convenience while working with the APKBUILD.
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| ; build()
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| : ''Required''. This is the compilation stage. This function will be called as normal user (unless the package() function is missing - for compatibility reasons). If no compilation is needed this function can contain a single ''return 0''.
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| ; package()
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| : ''Required''. In this function the built application and files should be installed in "$pkgdir".
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| {{Note| Building in fakeroot will reduce performance for parallell builds dramatically. That is why we do the ''build()'' and ''package()'' separation.}}
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| The following functions are provided by abuild and is overrideable:
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| ; fetch()
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| : download remote sources listed in $source to ''$SRCDEST'' and create symlinks to ''$srcdir''.
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| ; unpack()
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| : unpacks .tar.gz .tar.bz2 .tgz and .zip archices in ''$srcdir''.
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| ; dev()
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| : Subpackage function for -dev packages. By default this will only call ''default_dev'' which will move ''$pkgdir/usr/include'', ''*.a'', ''*.la'' and similar files to ''$subpkgdir''.
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| ; doc()
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| : Subpackage function for -doc packages. By default this will only call ''default_doc'' which will move ''$pkgdir/usr/share/doc'', ''$pkgdir/usr/share/man'' and similar to ''$subpkgdir''.
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