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Clarify examples in include merging and deep merging documentation (#607).
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NEWS
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NEWS
@ -1,5 +1,6 @@
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1.7.5.dev0
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* #604: Fix traceback when a configuration section is present but lacking any options.
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* #607: Clarify examples in include merging and deep merging documentation.
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1.7.4
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* #596: Fix special file detection erroring when broken symlinks are encountered.
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@ -106,11 +106,60 @@ But if you do want to merge in a YAML key *and* its values, keep reading!
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## Include merging
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If you need to get even fancier and pull in common configuration options while
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potentially overriding individual options, you can perform a YAML merge of
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included configuration using the YAML `<<` key. For instance, here's an
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example of a main configuration file that pulls in two retention options via
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an include and then overrides one of them locally:
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If you need to get even fancier and merge in common configuration options, you
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can perform a YAML merge of included configuration using the YAML `<<` key.
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For instance, here's an example of a main configuration file that pulls in
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retention and consistency options via a single include:
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```yaml
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<<: !include /etc/borgmatic/common.yaml
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location:
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...
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```
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This is what `common.yaml` might look like:
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```yaml
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retention:
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keep_hourly: 24
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keep_daily: 7
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consistency:
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checks:
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- name: repository
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```
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Once this include gets merged in, the resulting configuration would have all
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of the `location` options from the original configuration file *and* the
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`retention` and `consistency` options from the include.
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Prior to borgmatic version 1.6.0, when there's a section collision between the
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local file and the merged include, the local file's section takes precedence.
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So if the `retention` section appears in both the local file and the include
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file, the included `retention` is ignored in favor of the local `retention`.
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But see below about deep merge in version 1.6.0+.
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Note that this `<<` include merging syntax is only for merging in mappings
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(configuration options and their values). But if you'd like to include a
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single value directly, please see the section above about standard includes.
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Additionally, there is a limitation preventing multiple `<<` include merges
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per section. So for instance, that means you can do one `<<` merge at the
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global level, another `<<` within each configuration section, etc. (This is a
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YAML limitation.)
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### Deep merge
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<span class="minilink minilink-addedin">New in version 1.6.0</span> borgmatic
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performs a deep merge of merged include files, meaning that values are merged
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at all levels in the two configuration files. This allows you to include
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common configuration—up to full borgmatic configuration files—while overriding
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only the parts you want to customize.
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For instance, here's an example of a main configuration file that pulls in two
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retention options via an include and then overrides one of them locally:
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```yaml
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<<: !include /etc/borgmatic/common.yaml
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@ -136,24 +185,8 @@ Once this include gets merged in, the resulting configuration would have a
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When there's an option collision between the local file and the merged
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include, the local file's option takes precedence.
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Note that this `<<` include merging syntax is only for merging in mappings
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(configuration options and their values). But if you'd like to include a
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single value directly, please see the section above about standard includes.
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Additionally, there is a limitation preventing multiple `<<` include merges
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per section. So for instance, that means you can do one `<<` merge at the
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global level, another `<<` within each configuration section, etc. (This is a
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YAML limitation.)
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### Deep merge
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<span class="minilink minilink-addedin">New in version 1.6.0</span> borgmatic
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performs a deep merge of merged include files, meaning that values are merged
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at all levels in the two configuration files. Colliding list values are
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appended together. This allows you to include common configuration—up to full
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borgmatic configuration files—while overriding only the parts you want to
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customize.
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<span class="minilink minilink-addedin">New in version 1.6.1</span> Colliding
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list values are appended together.
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## Configuration overrides
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