php-hotfix/docs/EXPRESSIONS.md

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Matching Expressions
====================
Hotfixes can provide a `for` key with an array of supported systems. The
expressions are evaluated using Symfony's ExpressionLanguage and as such
can handle some pretty complex stuff.
For a hotfix to be considered supported, at least one of the expressions
must evaluate to true.
## Example:
for:
- lsb.id=='raspbian'
- lsb.id=='ubuntu' and lsb.release=>'16.04'
## System facts
### Distribution
Information is retrieved using `lsb_release` or the `/etc/os-release` file.
lsb.id Distribution ID (ex. ubuntu or raspbian)
lsb.description Pretty description
lsb.release Version number (ex. 16.04 or 8)
lsb.codename Release codename (ex. xenial, not always present)