Documentation

assemble – Assembles a configuration file from fragments

Synopsis

  • Assembles a configuration file from fragments. Often a particular program will take a single configuration file and does not support a conf.d style structure where it is easy to build up the configuration from multiple sources. assemble will take a directory of files that can be local or have already been transferred to the system, and concatenate them together to produce a destination file. Files are assembled in string sorting order. Puppet calls this idea fragments.

Parameters

Parameter Choices/Defaults Comments
attributes
-
added in 2.3
Attributes the file or directory should have. To get supported flags look at the man page for chattr on the target system. This string should contain the attributes in the same order as the one displayed by lsattr.
= operator is assumed as default, otherwise + or - operators need to be included in the string.

aliases: attr
backup
boolean
    Choices:
  • no ←
  • yes
Create a backup file (if yes), including the timestamp information so you can get the original file back if you somehow clobbered it incorrectly.
decrypt
boolean
added in 2.4
    Choices:
  • no
  • yes ←
This option controls the autodecryption of source files using vault.
delimiter
-
added in 1.4
A delimiter to separate the file contents.
dest
- / required
A file to create using the concatenation of all of the source files.
group
-
Name of the group that should own the file/directory, as would be fed to chown.
ignore_hidden
boolean
added in 2.0
    Choices:
  • no ←
  • yes
A boolean that controls if files that start with a '.' will be included or not.
mode
-
Mode the file or directory should be. For those used to /usr/bin/chmod remember that modes are actually octal numbers. You must either add a leading zero so that Ansible's YAML parser knows it is an octal number (like 0644 or 01777) or quote it (like '644' or '1777') so Ansible receives a string and can do its own conversion from string into number. Giving Ansible a number without following one of these rules will end up with a decimal number which will have unexpected results. As of version 1.8, the mode may be specified as a symbolic mode (for example, u+rwx or u=rw,g=r,o=r).
owner
-
Name of the user that should own the file/directory, as would be fed to chown.
regexp
-
Assemble files only if regex matches the filename. If not set, all files are assembled. All "\" (backslash) must be escaped as "\\" to comply yaml syntax. Uses Python regular expressions; see http://docs.python.org/2/library/re.html.
remote_src
boolean
added in 1.4
    Choices:
  • no
  • yes ←
If False, it will search for src at originating/master machine, if True it will go to the remote/target machine for the src. Default is True.
selevel
-
Default:
s0
Level part of the SELinux file context. This is the MLS/MCS attribute, sometimes known as the range. _default feature works as for seuser.
serole
-
Role part of SELinux file context, _default feature works as for seuser.
setype
-
Type part of SELinux file context, _default feature works as for seuser.
seuser
-
User part of SELinux file context. Will default to system policy, if applicable. If set to _default, it will use the user portion of the policy if available.
src
- / required
An already existing directory full of source files.
unsafe_writes
boolean
added in 2.2
    Choices:
  • no ←
  • yes
By default this module uses atomic operations to prevent data corruption or inconsistent reads from the target files, but sometimes systems are configured or just broken in ways that prevent this. One example is docker mounted files, which cannot be updated atomically from inside the container and can only be written in an unsafe manner.
This option allows Ansible to fall back to unsafe methods of updating files when atomic operations fail (however, it doesn't force Ansible to perform unsafe writes). IMPORTANT! Unsafe writes are subject to race conditions and can lead to data corruption.
validate
-
added in 2.0
The validation command to run before copying into place. The path to the file to validate is passed in via '%s' which must be present as in the sshd example below. The command is passed securely so shell features like expansion and pipes won't work.

Examples

# Example from Ansible Playbooks
- assemble:
    src: /etc/someapp/fragments
    dest: /etc/someapp/someapp.conf

# When a delimiter is specified, it will be inserted in between each fragment
- assemble:
    src: /etc/someapp/fragments
    dest: /etc/someapp/someapp.conf
    delimiter: '### START FRAGMENT ###'

# Copy a new "sshd_config" file into place, after passing validation with sshd
- assemble:
    src: /etc/ssh/conf.d/
    dest: /etc/ssh/sshd_config
    validate: '/usr/sbin/sshd -t -f %s'

Status

Red Hat Support

More information about Red Hat’s support of this module is available from this Red Hat Knowledge Base article.

Authors

  • Stephen Fromm (@sfromm)

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