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image.pp
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image.pp
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# == Class: docker
#
# Module to install an up-to-date version of a Docker image
# from the registry
#
# === Parameters
# [*ensure*]
# Whether you want the image present or absent.
#
# [*image*]
# If you want the name of the image to be different from the
# name of the puppet resource you can pass a value here.
#
# [*image_tag*]
# If you want a specific tag of the image to be installed
#
# [*image_digest*]
# If you want a specific content digest of the image to be installed
#
# [*docker_file*]
# If you want to add a docker image from specific docker file
#
# [*docker_tar*]
# If you want to load a docker image from specific docker tar
#
define docker::image(
$ensure = 'present',
$image = $title,
$image_tag = undef,
$image_digest = undef,
$force = false,
$docker_file = undef,
$docker_dir = undef,
$docker_tar = undef,
) {
include docker::params
$docker_command = $docker::params::docker_command
validate_re($ensure, '^(present|absent|latest)$')
validate_re($image, '^[\S]*$')
validate_bool($force)
# Wrapper used to ensure images are up to date
ensure_resource('file', '/usr/local/bin/update_docker_image.sh',
{
ensure => $docker::params::ensure,
owner => 'root',
group => 'root',
mode => '0555',
content => template('docker/update_docker_image.sh.erb'),
}
)
if ($docker_file) and ($docker_dir) {
fail 'docker::image must not have both $docker_file and $docker_dir set'
}
if ($docker_file) and ($docker_tar) {
fail 'docker::image must not have both $docker_file and $docker_tar set'
}
if ($docker_dir) and ($docker_tar) {
fail 'docker::image must not have both $docker_dir and $docker_tar set'
}
if ($image_digest) and ($docker_file) {
fail 'docker::image must not have both $image_digest and $docker_file set'
}
if ($image_digest) and ($docker_dir) {
fail 'docker::image must not have both $image_digest and $docker_dir set'
}
if ($image_digest) and ($docker_tar) {
fail 'docker::image must not have both $image_digest and $docker_tar set'
}
if $force {
$image_force = '-f '
} else {
$image_force = ''
}
if $image_tag {
$image_arg = "${image}:${image_tag}"
$image_remove = "${docker_command} rmi ${image_force}${image}:${image_tag}"
$image_find = "${docker_command} images | egrep '^(docker.io/)?${image} ' | awk '{ print \$2 }' | grep ^${image_tag}$"
} elsif $image_digest {
$image_arg = "${image}@${image_digest}"
$image_remove = "${docker_command} rmi ${image_force}${image}:${image_digest}"
$image_find = "${docker_command} images --digests | egrep '^(docker.io/)?${image} ' | awk '{ print \$3 }' | grep ^${image_digest}$"
} else {
$image_arg = $image
$image_remove = "${docker_command} rmi ${image_force}${image}"
$image_find = "${docker_command} images | cut -d ' ' -f 1 | egrep '^(docker\\.io/)?${image}$'"
}
if $docker_dir {
$image_install = "${docker_command} build -t ${image_arg} ${docker_dir}"
} elsif $docker_file {
$image_install = "${docker_command} build -t ${image_arg} - < ${docker_file}"
} elsif $docker_tar {
$image_install = "${docker_command} load -i ${docker_tar}"
} else {
$image_install = "/usr/local/bin/update_docker_image.sh ${image_arg}"
}
if $ensure == 'absent' {
exec { $image_remove:
path => ['/bin', '/usr/bin'],
onlyif => $image_find,
timeout => 0,
}
} elsif $ensure == 'latest' {
exec { "echo 'Update of ${image_arg} complete'":
environment => 'HOME=/root',
path => ['/bin', '/usr/bin'],
timeout => 0,
onlyif => $image_install,
require => File['/usr/local/bin/update_docker_image.sh'],
}
} elsif $ensure == 'present' {
exec { $image_install:
unless => $image_find,
environment => 'HOME=/root',
path => ['/bin', '/usr/bin'],
timeout => 0,
returns => ['0', '2'],
require => File['/usr/local/bin/update_docker_image.sh'],
}
}
}

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