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Flexible software building recipe.

Project description

slapos.recipe.build

Contents

The default recipe can be used to execute ad-hoc Python code at init/install/update phases. install must create the path pointed to by location (default is ${buildout:parts-directory}/${:_buildout_section_name_}) and any other file system change is not tracked by buildout. install defaults to update, in which case location is ignored.

Example that installs software:

[buildout]
parts =
  script

[script]
recipe = slapos.recipe.build
slapos_promise =
  directory:include
  file:share/man/man1/foo.1
  statlib:lib/libfoo.a
  statlib:lib/libfoo.la
  dynlib:bin/foo linked:libbar.so.1,libc.so.6,libfoo.so.1 rpath:${bar:location}/lib,!/lib
url = http://host/path/foo.tar.gz
md5sum = ...
install =
  extract_dir = self.extract(self.download())
  self.copyTree(guessworkdir(extract_dir), location)
  ${:update}
update =
  ...

Using the init option:

[section-one]
recipe = slapos.recipe.build
init =
  import platform
  options['foo'] = platform.uname()[4]

[section-two]
bar = ${section-one:foo}

In case of error, a proper traceback is displayed and nothing is installed:

>>> write(sample_buildout, 'buildout.cfg', """
... [buildout]
... parts = script
...
... [script]
... recipe = slapos.recipe.build
... install =
...   import os
...   os.mkdir(location)
...   print(1 / 0.) # this is an error !
... """)

>>> print(system(buildout))
Installing script.
While:
  Installing script.
<BLANKLINE>
An internal error occurred due to a bug in either zc.buildout or in a
recipe being used:
Traceback (most recent call last):
...
  File "script", line 3, in <module>
    print(1 / 0.) # this is an error !
ZeroDivisionError: float division by zero

>>> ls(sample_buildout, 'parts')
<BLANKLINE>

option: environment

Customizing environment variables can be easier with the this option. Values are expanded with Python %-dict formatting, using os.environ. The resulting environ dict is computed on first access of self.environ. Environment variables can be either inlined:

>>> base = """
... [buildout]
... parts = script
...
... [script]
... recipe = slapos.recipe.build
... update =
...   import os
...   os.environ["FOO"] = "1"
...   print("%(FOO)s %(BAR)s" % self.environ)
...   os.environ["FOO"] = "2"
...   print("%(FOO)s %(BAR)s" % self.environ)
... """
>>> write(sample_buildout, 'buildout.cfg', base + """
... environment =
...   BAR=%(FOO)s:%%
... """)
>>> print(system(buildout))
Installing script.
script: [ENV] BAR = 1:%
1 1:%
1 1:%

or put inside a separate section:

>>> write(sample_buildout, 'buildout.cfg', base + """
... environment = env
... [env]
... BAR=%(FOO)s:%%
... """)
>>> print(system(buildout))
Uninstalling script.
Installing script.
script: [ENV] BAR = 1:%
1 1:%
1 1:%

This option works the same way in other recipes that support it, in which case the resulting environ dict is computed at install/update.

option: shared

Boolean (false by default, or true), this option specifies that the part can be installed in a shared mode. This is enabled if paths are listed in the shared-part-list option of the [buildout] section: the location of the part is <one of shared-part-list>/<part name>/<hash of options> and it contains a signature file .buildout-shared.json.

install option is required:

>>> del MD5SUM[:]
>>> base = """
... [buildout]
... parts = script
... shared-part-list =
...   ${:directory}/shared1
...   ${:directory}/shared2
...
... [script]
... recipe = slapos.recipe.build
... shared = true
... """
>>> write(sample_buildout, 'buildout.cfg', base + """
... init = pass
... """)
>>> print(system(buildout))
script: shared at .../shared2/script/<MD5SUM:0>
While:
  Installing.
  Getting section script.
  Initializing section script.
Error: When shared=true, option 'install' must be set

update option is incompatible:

>>> base += """
... install =
...   import os
...   os.makedirs(os.path.join(location, 'foo'))
...   print("directory created")
... """
>>> write(sample_buildout, 'buildout.cfg', base)
>>> print(system(buildout + ' script:update=pass'))
script: shared at .../shared2/script/<MD5SUM:1>
While:
  Installing.
  Getting section script.
  Initializing section script.
Error: When shared=true, option 'update' can't be set

A shared part is installed in the last folder that is listed by shared-part-list:

>>> print(system(buildout))
script: shared at .../shared2/script/<MD5SUM:2>
Uninstalling script.
Installing script.
directory created
>>> shared = 'shared2/script/' + MD5SUM[2]
>>> ls(shared)
-  .buildout-shared.json
l  .buildout-shared.signature
d  foo

.buildout-shared.signature is only there for backward compatibility.

Uninstalling the part leaves the shared part available:

>>> print(system(buildout + ' buildout:parts='))
Uninstalling script.
Unused options for buildout: 'shared-part-list'.
>>> ls(shared)
-  .buildout-shared.json
l  .buildout-shared.signature
d  foo

And reinstalling is instantaneous:

>>> print(system(buildout))
script: shared at .../shared2/script/<MD5SUM:2>
Installing script.
script: shared part is already installed

Setting location option is incompatible:

>>> write(sample_buildout, 'buildout.cfg', base + """
... init =
...   import os
...   options['location'] = os.path.join(
...     self.buildout['buildout']['parts-directory'], 'foo')
... """)
>>> print(system(buildout))
script: shared at .../shared2/script/<MD5SUM:3>
While:
  Installing.
  Getting section script.
  Initializing section script.
Error: When shared=true, option 'location' can't be set

option: location

If empty or unset, the value is initialized automatically according to rules defined above (shared option), and before the init code is executed. This way, it’s possible to initialize other values of the section depending on the actual value of location.

If not shared, the value can be customized in init. This is actually the only way to empty location, which is useful if there’s nothing file/directory to track but you need to distinguish install from update:

>>> write(sample_buildout, 'buildout.cfg', """
... [buildout]
... parts = script
...
... [script]
... recipe = slapos.recipe.build
... init =
...   options['location'] = ''
... install =
...   print("install")
... update =
...   print("update")
... """)

>>> print(system(buildout))
Uninstalling script.
Installing script.
install
>>> print(system(buildout))
Updating script.
update
>>> cat('.installed.cfg')
[buildout]
...
[script]
__buildout_installed__ =
__buildout_signature__ = ...

If install & update run the same code, install can be unset (or empty) and you can ignore location.

slapos.recipe.build:download

Simplest usage is to only specify a URL:

>>> base = """
... [buildout]
... parts = download
...
... [download]
... recipe = slapos.recipe.build:download
... url = https://lab.nexedi.com/nexedi/slapos.recipe.build/raw/master/MANIFEST.in
... """
>>> write(sample_buildout, 'buildout.cfg', base)
>>> print(system(buildout))
Uninstalling script.
Installing download.
Downloading ...
>>> ls('parts/download')
-  download

The file is downloaded to parts/<section_name>/<section_name>.

Because the destination file may be hardlinked (e.g. download from cache or from local file), it shall not be modified in-place without first making sure that st_nlink is 1.

option: filename

In the part folder, the filename can be customized:

>>> write(sample_buildout, 'buildout.cfg', base + """
... filename = somefile
... """)
>>> print(system(buildout))
Uninstalling download.
Installing download.
Downloading ...
>>> ls('parts/download')
-  somefile

When an MD5 checksum is not given, updating the part downloads the file again:

>>> remove('parts/download/somefile')
>>> print(system(buildout))
Updating download.
Downloading ...
>>> ls('parts/download')
-  somefile

option: destination

Rather than having a file inside a part folder, a full path can be given:

>>> write(sample_buildout, 'buildout.cfg', base + """
... destination = ${buildout:parts-directory}/somepath
... """)
>>> print(system(buildout))
Uninstalling download.
Installing download.
Downloading ...
>>> ls('parts')
-  somepath

option: target

In any case, path to download file is exposed by the target option:

>>> cat('.installed.cfg')
[buildout]
...
[download]
__buildout_installed__ = .../parts/somepath
__buildout_signature__ = ...
destination = .../parts/somepath
recipe = slapos.recipe.build:download
target = .../parts/somepath
url = ...

option: md5sum

An MD5 checksum can be specified to check the contents:

>>> base += """
... md5sum = b90c12a875df544907bc84d9c7930653
... """
>>> write(sample_buildout, 'buildout.cfg', base)
>>> print(system(buildout))
Uninstalling download.
Installing download.
Downloading ...
>>> ls('parts/download')
-  download

In such case, updating the part does nothing:

>>> remove('parts/download/download')
>>> print(system(buildout))
Updating download.
>>> ls('parts/download')

In case of checksum mismatch:

>>> print(system(buildout
... + ' download:md5sum=00000000000000000000000000000000'
... ))
Uninstalling download.
Installing download.
Downloading ...
While:
  Installing download.
Error: MD5 checksum mismatch downloading '...'
>>> ls('parts')

option: offline

Boolean option that can be specified to override ${buildout:offline}.

option: alternate-url

Alternate URL. If supported by Buildout, it is used as fallback if the main URL (url option) fails at HTTP level.

Useful when a version of a resource can only be downloaded with a temporary URL as long as it’s the last version, and this version is then moved to a permanent place when a newer version is released: url shall be the final URL and alternate-url the temporary one.

option: shared

Works like the default recipe. Constraints on options are:

  • md5sum option is required
  • destination option is incompatible

Example:

>>> del MD5SUM[4:] # drop added values since previous shared test
>>> write(sample_buildout, 'buildout.cfg', base + """
... shared = true
...
... [buildout]
... shared-part-list =
...   ${:directory}/shared
... """)
>>> print(system(buildout))
download: shared at .../shared/download/<MD5SUM:4>
Installing download.
Downloading ...
>>> shared = 'shared/download/' + MD5SUM[4]
>>> ls(shared)
-  .buildout-shared.json
l  .buildout-shared.signature
-  download

slapos.recipe.build:download-unpacked

Downloads and extracts an archive. In addition to format that setuptools is able to extract, XZ & lzip compression are also supported if xzcat & lunzip executables are available.

By default, the archive is extracted to parts/<section_name> and a single directory at the root of the archive is stripped:

>>> URL = "https://lab.nexedi.com/nexedi/slapos.recipe.build/-/archive/master/slapos.recipe.build-master.tar.gz?path=slapos/recipe/build"
>>> base = """
... [buildout]
... download-cache = download-cache
... parts = download
...
... [download]
... recipe = slapos.recipe.build:download-unpacked
... url = %s
... """ % URL
>>> write(sample_buildout, 'buildout.cfg', base)
>>> print(system(buildout))
Creating directory '.../download-cache'.
Uninstalling download.
Installing download.
Downloading ...
>>> ls('parts/download')
d  slapos

The download cache will avoid to download the same tarball several times.

option: destination

Similar to download recipe:

>>> write(sample_buildout, 'buildout.cfg', base + """
... destination = ${buildout:parts-directory}/somepath
... """)
>>> print(system(buildout))
Uninstalling download.
Installing download.
>>> ls('parts/somepath')
d  slapos

option: target

Like for download recipe, the installation path of the part is exposed by the target option:

>>> cat('.installed.cfg')
[buildout]
...
[download]
__buildout_installed__ = .../parts/somepath
__buildout_signature__ = ...
destination = .../parts/somepath
recipe = slapos.recipe.build:download-unpacked
target = .../parts/somepath
url = ...

option: strip-top-level-dir

Stripping can be enforced:

>>> print(system(buildout + ' download:strip-top-level-dir=true'))
Uninstalling download.
Installing download.
>>> ls('parts/somepath')
d  slapos

Or disabled:

>>> print(system(buildout + ' download:strip-top-level-dir=false'))
Uninstalling download.
Installing download.
>>> ls('parts/somepath')
d  slapos.recipe.build-master-slapos-recipe-build

option: md5sum

An MD5 checksum can be specified to check the downloaded file, like for the download recipe. However, if unset, updating the part does nothing.

option: alternate-url

See the download recipe.

option: environment

Like for the default recipe, environment variables can be customized, here for xzcat & lunzip subprocesses (e.g. PATH).

option: shared

Works like the default recipe. The only constraint on options is that the destination option is incompatible.

Example:

>>> del MD5SUM[5:] # drop added values since previous shared test
>>> write(sample_buildout, 'buildout.cfg', """
... [buildout]
... download-cache = download-cache
... parts = download
... shared-part-list = ${:directory}/shared
...
... [download]
... recipe = slapos.recipe.build:download-unpacked
... url = %s
... shared = true
... """ % URL)
>>> print(system(buildout))
download: shared at .../shared/download/<MD5SUM:5>
Uninstalling download.
Installing download.

slapos.recipe.build:gitclone

Checkout a git repository and its submodules by default. Supports slapos.libnetworkcache if present, and if boolean ‘use-cache’ option is true.

Examples

Those examples use slapos.recipe.build repository as an example.

Simple clone

Only repository parameter is required. For each buildout run, the recipe will pick up the latest commit on the remote master branch:

>>> write(sample_buildout, 'buildout.cfg',
... """
... [buildout]
... parts = git-clone
...
... [git-clone]
... recipe = slapos.recipe.build:gitclone
... repository = https://lab.nexedi.com/nexedi/slapos.recipe.build.git
... use-cache = true
... """)

This will clone the git repository in parts/git-clone directory. Then let’s run the buildout:

>>> print(system(buildout))
Uninstalling download.
Installing git-clone.
Cloning into '/sample-buildout/parts/git-clone'...

Let’s take a look at the buildout parts directory now:

>>> ls(sample_buildout, 'parts')
d git-clone

When updating, it will do a “git fetch; git reset @{upstream}”:

>>> print(system(buildout))
Updating git-clone.
Fetching origin
HEAD is now at ...

Specific branch

You can specify a specific branch using branch option. For each run it will take the latest commit on this remote branch:

>>> write(sample_buildout, 'buildout.cfg',
... """
... [buildout]
... parts = git-clone
...
... [git-clone]
... recipe = slapos.recipe.build:gitclone
... repository = https://lab.nexedi.com/nexedi/slapos.recipe.build.git
... branch = build_remove_downloaded_files
... """)

Then let’s run the buildout:

>>> print(system(buildout))
Uninstalling git-clone.
Running uninstall recipe.
Installing git-clone.
Cloning into '/sample-buildout/parts/git-clone'...

Let’s take a look at the buildout parts directory now:

>>> ls(sample_buildout, 'parts')
d git-clone

And let’s see that current branch is “build”:

>>> import subprocess
>>> cd('parts', 'git-clone')
>>> print(subprocess.check_output(['git', 'branch'], universal_newlines=True))
* build_remove_downloaded_files

When updating, it will do a “git fetch; git reset build”:

>>> cd(sample_buildout)
>>> print(system(buildout))
Updating git-clone.
Fetching origin
HEAD is now at ...

Specific revision

You can specify a specific commit hash or tag using revision option. This option has priority over the “branch” option:

>>> cd(sample_buildout)
>>> write(sample_buildout, 'buildout.cfg',
... """
... [buildout]
... parts = git-clone
...
... [git-clone]
... recipe = slapos.recipe.build:gitclone
... repository = https://lab.nexedi.com/nexedi/slapos.recipe.build.git
... revision = 2566127
... """)

Then let’s run the buildout:

>>> print(system(buildout))
Uninstalling git-clone.
Running uninstall recipe.
Installing git-clone.
Cloning into '/sample-buildout/parts/git-clone'...
HEAD is now at 2566127 ...

Let’s take a look at the buildout parts directory now:

>>> ls(sample_buildout, 'parts')
d git-clone

And let’s see that current revision is “2566127”:

>>> import subprocess
>>> cd(sample_buildout, 'parts', 'git-clone')
>>> print(subprocess.check_output(['git', 'rev-parse', '--short', 'HEAD'], universal_newlines=True))
2566127

When updating, it shouldn’t do anything as revision is mentioned:

>>> cd(sample_buildout)
>>> print(system(buildout))
Updating git-clone.

Empty revision/branch

Specifying an empty revision or an empty branch will make buildout ignore those values as if it was not present at all (allowing to easily extend an existing section specifying a branch):

>>> cd(sample_buildout)
>>> write(sample_buildout, 'buildout.cfg',
... """
... [buildout]
... parts = git-clone
...
... [git-clone-with-branch]
... recipe = slapos.recipe.build:gitclone
... repository = https://lab.nexedi.com/nexedi/slapos.recipe.build.git
... revision = 2566127
...
... [git-clone]
... <= git-clone-with-branch
... revision =
... branch = master
... """)

>>> print(system(buildout))
Uninstalling git-clone.
Running uninstall recipe.
Installing git-clone.
Cloning into '/sample-buildout/parts/git-clone'...

>>> cd(sample_buildout, 'parts', 'git-clone')
>>> print(system('git branch'))
* master

Revision/branch priority

If both revision and branch parameters are set, revision parameters is used and branch parameter is ignored:

>>> cd(sample_buildout)
>>> write(sample_buildout, 'buildout.cfg',
... """
... [buildout]
... parts = git-clone
...
... [git-clone]
... recipe = slapos.recipe.build:gitclone
... repository = https://lab.nexedi.com/nexedi/slapos.recipe.build.git
... branch = mybranch
... revision = 2566127
... """)

>>> print(system(buildout))
Uninstalling git-clone.
Running uninstall recipe.
Installing git-clone.
Warning: "branch" parameter with value "mybranch" is ignored. Checking out to revision 2566127...
Cloning into '/sample-buildout/parts/git-clone'...
HEAD is now at 2566127 ...

>>> cd(sample_buildout, 'parts', 'git-clone')
>>> print(system('git branch'))
* master

Setup a “develop” repository

If you need to setup a repository that will be manually altered over time for development purposes, you need to make sure buildout will NOT alter it and NOT erase your local modifications by specifying the “develop” flag:

[buildout]
parts = git-clone

[git-clone]
recipe = slapos.recipe.build:gitclone
repository = https://example.net/example.git/
develop = true

>>> cd(sample_buildout)
>>> write(sample_buildout, 'buildout.cfg',
... """
... [buildout]
... parts = git-clone
...
... [git-clone]
... recipe = slapos.recipe.build:gitclone
... repository = https://lab.nexedi.com/nexedi/slapos.recipe.build.git
... develop = true
... """)

>>> print(system(buildout))
Uninstalling git-clone.
Running uninstall recipe.
Installing git-clone.
Cloning into '/sample-buildout/parts/git-clone'...

Buildout will then keep local modifications, instead of resetting the repository:

>>> cd(sample_buildout, 'parts', 'git-clone')
>>> print(system('echo foo > setup.py'))

>>> cd(sample_buildout)
>>> print(system(buildout))
Updating git-clone.

>>> cd(sample_buildout, 'parts', 'git-clone')
>>> print(system('cat setup.py'))
foo

Then, when update occurs, nothing is done:

>>> cd(sample_buildout, 'parts', 'git-clone')
>>> print(system('echo kept > local_change'))

>>> print(system('git remote add broken http://git.erp5.org/repos/nowhere'))
...

>>> cd(sample_buildout)
>>> print(system(buildout))
Updating git-clone.

>>> cd(sample_buildout, 'parts', 'git-clone')
>>> print(system('cat local_change'))
kept

In case of uninstall, buildout will keep the repository directory:

>>> cd(sample_buildout)
>>> write(sample_buildout, 'buildout.cfg',
... """
... [buildout]
... parts = git-clone
...
... [git-clone]
... recipe = slapos.recipe.build:gitclone
... repository = https://lab.nexedi.com/nexedi/slapos.recipe.build.git
... develop = true
... # Triggers uninstall/install because of section signature change
... foo = bar
... """)

>>> print(system(buildout))
Uninstalling git-clone.
Running uninstall recipe.
You have uncommited changes in /sample-buildout/parts/git-clone. This folder will be left as is.
Installing git-clone.
destination directory already exists.
...
<BLANKLINE>

Specific git binary

The default git command is git, if for a any reason you don’t have git in your path, you can specify git binary path with git-command option.

Ignore SSL certificate

By default, when remote server use SSL protocol git checks if the SSL certificate of the remote server is valid before executing commands. You can force git to ignore this check using ignore-ssl-certificate boolean option:

[buildout]
parts = git-clone

[git-clone]
recipe = slapos.recipe.build:gitclone
repository = https://example.net/example.git/
ignore-ssl-certificate = true

Ignore cloning submodules

By default, cloning the repository will clone its submodules also. You can force git to ignore cloning submodules by defining ignore-cloning-submodules boolean option to ‘true’:

[buildout]
parts = git-clone

[git-clone]
recipe = slapos.recipe.build:gitclone
repository = https://lab.nexedi.com/tiwariayush/test_erp5
ignore-cloning-submodules = true

Other options

depth
Clone with --depth=<depth> option. See git-clone command.
shared
Clone with --shared option if true. See git-clone command.
sparse-checkout
The value of the sparse-checkout option is written to the $GITDIR/info/sparse-checkout file, which is used to populate the working directory sparsely. See the SPARSE CHECKOUT section of git-read-tree command. This feature is disabled if the value is empty or unset.

Full example

[buildout]
parts = git-clone

[git-binary]
recipe = hexagonit.recipe.cmmi
url = http://git-core.googlecode.com/files/git-1.7.12.tar.gz

[git-clone]
recipe = slapos.recipe.build:gitclone
repository = http://example.net/example.git/
git-command = ${git-binary:location}/bin/git
revision = 0123456789abcdef

slapos.recipe.build:npm

Downloads and installs node.js packages using Node Package Manager (NPM).

Examples

Basic example

Here is example to install one or several modules:

[buildout]
parts = node-package

[node-package]
recipe = slapos.recipe.build:npm
modules =
  colors
  express

# Optional argument specifying perl buildout part, if existing.
# If specified, recipe will use the perl installed by buildout.
# If not specified, will take the globally available perl executable.
node = node-0.6

Specific version

[buildout]
parts = node-package

[node-package]
recipe = slapos.recipe.build:npm
modules =
  express@1.0.2
node = node-0.6

slapos.recipe.build:vm.*

This is a set of recipes to build Virtual Machine images and execute commands inside them. They rely on QEMU and OpenSSH: executables are found via the PATH environment variable. They do nothing on update.

Common options

location
Folder where the recipe stores any produced file. Default: ${buildout:parts-directory}/<section_name>
environment
Extra environment to spawn executables. See the default recipe.
mem
Python expression evaluating to an integer that specifies the RAM size in MB for the VM.
smp
Number of CPUs for the VM. Default: 1

Example

[vm-run-environment]
PATH = ${openssh:location}/bin:${qemu:location}/bin:%(PATH)s

[vm-run-base]
recipe = slapos.recipe.build:vm.run
environment = vm-run-environment
mem = 256 * (${:smp} + 1)
smp = 4

slapos.recipe.build:vm.install-debian

Install Debian from an ISO image. Additional required binaries:

  • 7z (from 7zip), to extract kernel/initrd from the ISO;
  • file, which is used to test that the VM image is bootable.

Currently, it only produces raw images, in discard mode (see -drive QEMU option): combined the use of discard mount option, this minimizes the used space on disk.

Options

location
Produced files: <dist>.img (1 for each token of dists), passwd and optionally ssh.key
arch
QEMU architecture (the recipe runs the qemu-system-<arch> executable). It is also used to select the ISO in the sections refered by dists. Default to host architecture.
dists
List of VMs to build: each token refers to a buildout section name that describes the ISOs to use. See ISO sections below. Tokens can’t contain ‘.’ characters.
size
Size of the VM image. This must be an integer, optionally followed by a IEC or SI suffix.
mem
Default: 384
[<dist>/]preseed.<preseed>
Set the <preseed> value for the installation. The recipe has many default preseed values: you can see the list in the InstallDebianRecipe.preseed class attribute (file slapos/recipe/vm.py). Aliases are recognized (but the recipe includes a mapping that may be out-of-date.). Any value except passwd/* can optionally be prefixed so that they only apply for a particular VM.
[<dist>/]debconf.<owner>
List of debconf value for <owner> (usually a package name), each line with 2 whitespace-separated parts: <key> <value>. Like for preseed.* values, they can be specific to <dist>.
late-command
Shell commands to execute at the end of the installation. They are run inside the target system. This is a reliable alternative to the preseed.preseed/late_command option. The DIST shell variable is set to the VM being built.
packages
Extra packages to install. Like for late-command, do not use preseed.pkgsel/include. If you want to install packages only for some specific <dist>, you can do it in late-command, by testing $DIST and using apt-get install -y.
vm.run

Boolean value that is true by default, to configure the VM for use with the slapos.recipe.build:vm.run recipe:

  • make sure that the ssh and sudo packages are installed
  • an SSH key is automatically created with ssh-keygen, and it can be used to connect as root

ISO sections

<arch>.iso
Name of the section that provides the ISO image, for example by downloading it. This section must define 2 options: location is the folder containing the ISO, and filename is the file name of the ISO.
<arch>.kernel
Path to kernel image inside the ISO.
<arch>.initrd
Path to initrd image inside the ISO.

User setup

By default, there’s no normal user created. Another rule is that a random password is automatically generated if there is no password specified.

You have nothing to do if you only plan to use the VM with vm.run.

For more information about the passwd/* preseed values, you can look at the user-setup-udeb package at https://anonscm.debian.org/cgit/d-i/user-setup.git/tree/ and in particular the user-setup-ask and user-setup-apply scripts.

Example

[vm-install-environment]
# vm-run-environment refers to the section in common options
PATH = ${file:location}/bin:${p7zip:location}/bin:${vm-run-environment:PATH}

[vm-debian]
recipe = slapos.recipe.build:vm.install-debian
environment = vm-install-environment
dists = debian-jessie debian-stretch
size = 2Gi
late-command =
# rdnssd causes too much trouble with QEMU 2.7, because the latter acts as
# a DNS proxy on both IPv4 and IPv6 without translating queries to what the
# host supports.
  dpkg -P rdnssd
debconf.debconf =
  debconf/frontend noninteractive
  debconf/priority critical
# minimal size
preseed.apt-setup/enable-source-repositories = false
preseed.recommends = false
preseed.tasks =

[debian-jessie]
x86_64.iso = debian-amd64-netinst.iso
x86_64.kernel = install.amd/vmlinuz
x86_64.initrd = install.amd/initrd.gz

[debian-stretch]
<= debian-jessie
x86_64.iso = debian-amd64-testing-netinst.iso

[debian-amd64-netinst.iso]
...

slapos.recipe.build:vm.run

Execute shell commands inside a VM, in snapshot mode (the VM image is not modified).

${buildout:directory} is always mounted as /mnt/buildout inside the VM.

Mount points use the 9p file-system. Make sure that:

  • QEMU is built with –enable-virtfs;
  • the VM runs a kernel that is recent enough (Debian Squeeze kernel 2.6.32 is known to fail, and you’d have to use the one from squeeze-backports).

Options

location
Folder where to store any produce file. Inside the guest, it is pointed to by the PARTDIR environment variable. It is also used as temporary storage for changes to the VM image.
vm
Folder containing the VM images and the ssh.key` file. See the location option of the vm.install-* recipes.
dist
VM image to use inside the vm folder.
drives
Extra drives. Each line is passed with -drive
commands
List of <command> options, each one being a shell script to execute via SSH. They are processed in sequence. This is usually only required if you want to reboot the VM. Default: command
mount.<name>
Extra mount point. The value is a host folder that is mounted as /mnt/<name>.
stop-ssh
Tell reboot function how to stop SSH (see Helpers). Default: systemctl stop ssh
user

Execute commands with this user. The value can be root. By default, it is empty and it means that:

  • a slapos user is created with the same uid/gid than the user using this recipe on the host, which can help accessing mount points;
  • sudo must be installed and the created user is allowed to become root without password.

In any case, SSH connects as root.

wait-ssh
Time to wait for (re)boot. The recipe fails if it can’t connect to the SSH server after this number of seconds. Default: 60

Helpers

Before commands are executed, all mount.<name> are mounted and a few helpers are set to make scripting easier.

set -e
This is done before anything else, to make buildout abort if any untested command fails.
reboot
Function to safely reboot the guest. The next command in commands will be executed once the SSH server is back.
map <host_path>
Function to map a folder inside ${buildout:directory}.
PARTDIR
Folder where to store any produced file. Inside the guest, it actually maps to location on the host. This is useful because you can’t write PARTDIR=`map ${:location}` if you don’t explicitly set location.

Example

[vm-run-base]
# extends above example in common options
vm = ${vm-debian:location}
dist = debian-jessie

[vm-debian]
# extends above example in vm.install-debian
packages += build-essential devscripts equivs git

[userhosts-repository]
recipe = slapos.recipe.build:gitclone
repository = https://lab.nexedi.com/nexedi/userhosts.git
# we don't need a working directory on the host
sparse-checkout = /.gitignore

[build-userhosts-map]
<= vm-run-base
repository = `map ${userhosts-repository:location}`
command =
  git clone -s ${:repository} userhosts
  cd userhosts
  mk-build-deps -irs sudo -t 'apt-get -y'
  dpkg-buildpackage -uc -b -jauto
  cd ..
  mv *.changes *.deb $PARTDIR

# Alternate way, which is required if [userhosts-repository] is extended
# in such way that the repository is outside ${buildout:directory}.
[build-userhosts-mount]
<= build-userhosts-map
mount.userhosts = ${userhosts-repository:location}
repository = /mnt/userhosts

[test-reboot]
<= vm-run-base
commands = hello world
hello =
  uptime -s
  echo Hello ...
  reboot
world =
  uptime -s
  echo ... world!

Changes

0.55 (2022-06-07)

  • downloadunpacked: fix extraction of symlinks when using an external decompressor

0.54 (2022-02-11)

  • default: allow ‘install’ to install no file/dir
  • default: fix case where ‘location’ does not contain any directory separator

0.53 (2022-01-11)

  • default: execute ‘init’ after the ‘location’ option is automatically set.
  • Drop multiarch support: see new ‘multiarch’ value in conditional configuration sections since SlapOS fork of zc.buildout version 2.7.1+slapos015.
  • default: make ‘self.download’ use url&md5sum options if called without url.
  • default: add support for xz/lz archives to ‘self.extract’.
  • download*: new ‘offline’ option to override ${buildout:offline}.

0.52 (2021-12-10)

  • default, download-unpacked: improve multiarch support (for the default recipe, multiarch() replaces guessPlatform()).
  • shared: fix trailing whitespace in signature file on Python 2.

0.51 (2021-12-08)

  • download: only take basename of ‘filename’ when the latter is used to calculate destination path
  • download: drop ‘mode’ option
  • gitclone: new ‘depth’ option

0.50 (2021-11-29)

  • download-unpacked: drop unused environment-section option

0.49 (2021-10-04)

  • download-unpacked: fix strip-top-level-dir if unset and nothing should be stripped.
  • Work around circular imports inside slapos.buildout.
  • default: preserve symlinks in copyTree() & extract().
  • default: fix error handling in pipeCommand().
  • shared: change JSON serialization of signature to indent with 2 spaces (instead of 0) and to save non-ascii chars as utf-8 (rather than escaped).

0.48 (2021-09-25)

  • New API to share parts:
    • new Shared class that should be used by recipes to make a part shared;
    • the signature file is in JSON format and it is named .buildout-shared.signature.
  • download*: fix shared=true using new Shared class.
  • download*: new alternate-url option.
  • download-unpacked: decompress directly within target folder to avoid copies accross different file systems.
  • default: add support for shared parts.
  • download-unpacked: environment-section option is deprecated.
  • download-unpacked: extract-directory option is dropped.
  • For some boolean options, the value must be either ‘false’ or ‘true’.

0.47 (2021-07-26)

  • default: Include current line in the tracebacks on error

0.46 (2020-09-11)

  • gitclone: let errors on update propagate

0.45 (2020-04-20)

  • default: only set default ‘location’ option if there’s an install script

0.44 (2020-03-20)

This release contains several backward-incompatible changes.

  • default: remove useless globals & ‘self’ methods
  • default: ‘script’ renamed to ‘install’, new ‘update’, clean up globals/locals
  • default: remove ‘format’ option
  • default: check that ‘install’ script creates ‘location’
  • default: do not warn if slapos_promise is not set
  • default: update doc

0.43 (2020-02-28)

  • default: new ‘init’ option.
  • default: do not strip ‘url’, ‘md5sum’, ‘path’ automatically (these options are not used by the recipe).
  • default: drop workaround for script starting with indentation.
  • shared: don’t touch symlink targets when making read-only recursively.
  • vm: no empty floppy/cdrom drives.
  • vm: always use GPT.
  • vm: switch to XFS.

0.42 (2019-10-16)

  • vm: use virtio-rng with host’s /dev/urandom to fix boot delays with recent OS
  • vm.run: use -cpu host
  • vm.run: new ‘drives’ option

0.41 (2019-06-19)

  • gitclone: add support for submodules, enabled by default.

0.40 (2018-10-29)

  • shared: fix signature test under Python 3.

0.39 (2018-10-26)

  • More Py3 fixes.

0.38 (2018-09-13)

  • download: fix regression in 0.37 breaking support for Python 3

0.37 (2018-08-27)

  • Drop slapos.recipe.build:cpan, use perl-CPAN-package macro instead.
  • downloadunpacked, download: add shared feature.

0.36 (2017-06-29)

  • Do not depend on slapos.libnetworkcache, which is optional.

0.35 (2017-06-21)

  • download: fix default permission of installed files.
  • download: do nothing on update if we’re sure that the source hasn’t changed.

0.34 (2017-06-05)

  • downloadunpacked: make compatible with Python 2.6, now that slapos.recipe.cmmi uses it, and we still want to bootstrap SlapOS on old OS.
  • downloadunpacked: fix clean up of temporary files
  • gitclone: assume unclean on uninstall when git-executable cannot be found.
  • Add support for Python 3, at least to bootstrap SlapOS from Python 3.

0.33 (2017-04-07)

  • download, downloadunpacked: remove downloaded files after unpacking.

0.32 (2017-03-08)

  • downloadunpacked: fix an issue in extracting hard links.

0.31 (2017-03-08)

  • downloadunpacked: support .xz and .lz archives.
  • downloadunpacked: extract symlinks in a tar archive as symlinks.

0.30 (2017-02-23)

  • script option: fix IndentationError with buildout 2, if some lines are indented.

0.28 (2016-11-08)

  • vm.run: workaround for old versions of mount
  • vm.install-debian:
    • No more limit on the number of preseed parameters, by placing a preseed.cfg file inside the initrd, instead of passing them all via the command line. The kernel is usually limited to 32 parameters and it panics when there are too many.
    • Dist-specific options.
    • Recognize preseed aliases.
    • late-command is run with ‘/bin/sh -e’ and it must exit with EX_OK (0), otherwise the installer stops.

0.27 (2016-10-30)

  • vm: change how commands can be easily run with a normal user account on the guest

0.26 (2016-10-29)

  • gitclone: new ‘shared’ option.
  • vm.install-debian: workaround for spurious “No network interfaces detected”
  • vm: use a normal user account by default

0.25 (2016-10-23)

  • gitclone: new ‘sparse-checkout’ option.
  • New vm.* recipes to build VM images and execute commands inside them.

0.24 (2016-10-10)

Improvements to default recipe:

  • Remove location if script fails.
  • If location already exists at install, warn instead of failing.
  • location can be a file. Similarly, the use of self.cleanup_dir_list & self.cleanup_file_list in script is deprecated in favor of self.cleanup_list.

0.23 (2015-10-22)

  • gitclone: We don’t have to fetch, if revision is already present in local git repository

0.22 (2015-10-19)

  • Support zc.buildout 2.

0.21 (2015-04-10)

  • Restore support for build scripts

0.20 (2015-03-06)

  • rerelease because “missing release” was cached in shacache

0.19 (2015-03-06)

  • gitclone: REVERT “when update(), if repository has local changes, don’t do anything but warn user.” With this commit, test nodes would not update the repository if it has local changes (eg. from pyc files)

0.18 (2015-02-05)

  • gitclone: don’t do anything at update() if develop=true.
  • gitclone: develop is false by default.
  • gitclone: don’t raise when uninstall if location does not exist.
  • gitclone: when update(), if repository has local changes, don’t do anything but warn user.

0.17 (2015-02-02)

  • gitclone: keep local changes when there is an error during update

0.16 (2015-01-12)

  • gitclone: fix option name for git-executable

0.15 (2014-11-28)

  • build: Fixup! Remove downloaded files at the end.

0.14 (2014-10-23)

  • build: Remove downloaded files at the end.

0.13 (2014-10-08)

  • gitclone: do not delete the working copy if develop is set.
  • gitclone: revision has priority over branch.
  • gitclone: empty parameter equals no parameter.

0.12 (2013-09-05)

  • gitclone: Do not upload to cache by default. ‘use-cache’ option replaces ‘forbid-download-cache’ and must be explicitely set in order to use cache.
  • gitclone: Do not cache working copy, which just duplicate .git folder.
  • gitclone: do not force to use ‘master’ branch when not specified.
  • gitclone: add git ‘ignore-ssl-certificate’ option.
  • gitclone: if directory is no longer present, install, never update.

0.11.6 (2013-02-25)

  • Cleanup pyc and pyo files when updating git repository [Sebastien Robin]

0.11.5 (2012-10-01)

  • Use @{upstream} git magic value, allow to fix update bugs. [Cedric de Saint Martin]

0.11.4 (2012-09-11)

  • libnetworkcache is added back as a dependency. gitclone has no sense without it in SlapOS context. [Cedric de Saint Martin]

0.11.3 (2012-09-10)

  • Removed explicit dependency of slapos.libnetworkcache. If not present, it will gracefully degrade. [Cedric de Saint Martin]

0.11.2 (2012-09-05)

  • Add location to Buildout “options” dict, so that it is exposed to other Buildout parts. [Cedric de Saint Martin]

0.11.1 (2012-09-05)

  • Add forbid-download-cache parameter, forbidding to fetch git from cache. [Cedric de Saint Martin]
  • Sanitize instance attributes. [Cedric de Saint Martin]

0.11 (2012-09-04)

  • Add slapos.recipe.build:gitclone recipe. [Cedric de Saint Martin]

0.10.2 (2012-08-02)

  • Update manifest to include readme.rst [Cedric de Saint Martin]

0.10.1 (2012-08-02)

  • Minor fix in ReST documentation formatting. [Cedric de Saint Martin]

0.10 (2012-07-02)

  • Add format = yes|no option. [Antoine Catton]

0.9 (2012-06-07)

  • Revert accidental release about upcoming version of slapos.recipe.build

0.8 (2012-06-07)

  • Add support for “path” argument [Cedric de Saint Martin]
  • Cleanup of download entry point [Vincent Pelletier]
  • Add npm and cpan entry points [Cedric de Saint Martin]

0.7 (2011-11-8)

  • Generic: Remove directory when needed, and only if it is wanted. [Cedric de Saint Martin]
  • Add slapos.recipe.downloadunpacked script [Alain Takoudjou]

0.6 (2011-09-08)

  • Cmmi: Support more compatibility with other recipes to build, especially hexagonit.recipe.cmmi. [Łukasz Nowak]
  • Generic: A lot of small improvements (like supporting values with = in environment) [Łukasz Nowak]
  • Generic: Use shlex to parse some options. [Antoine Catton]
  • Generic: Fix patch, it was not working, as not using stdin. [Antoine Catton]

0.5 (2011-09-06)

  • Download: Expose location too for compatiblity. [Łukasz Nowak]

0.4 (2011-09-06)

  • Cmmi: Provide more features to control build process. [Łukasz Nowak]

0.3 (2011-09-05)

  • Provide slapos.recipe.build:download utility. [Łukasz Nowak]

0.2 (2011-09-05)

  • Bugfix: Support buildout’s download cache during downlading. [Łukasz Nowak]
  • Bugfix: Honour correctly passed md5sum to download method. [Łukasz Nowak]
  • Feature: Utility methods pipeCommand and failIfPathExists. [Łukasz Nowak]
  • Bugfix: Rename promisee to promise. [Łukasz Nowak]
  • Feature: Just warn in case of lack of promise. [Łukasz Nowak]

0.1 (2011-08-26)

  • Add copyTree method to recursively copy [Cedric de Saint Martin]
  • add guessPlatform function to guess architecture in case of multi-architecture installation [Cedric de Saint Martin]

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