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* Property types have been improved to indicate what systems they target.
This prevents using eg, Property FreeBSD on a Debian system.
Transition guide for this sweeping API change:
- Change "host name & foo & bar"
to "host name $ props & foo & bar"
- Similarly, `propertyList` and `combineProperties` need `props`
to be used to combine together properties; they no longer accept
lists of properties. (If you have such a list, use `toProps`.)
- And similarly, Chroot, Docker, and Systemd container need `props`
to be used to combine together the properies used inside them.
- The `os` property is removed. Instead use `osDebian`, `osBuntish`,
or `osFreeBSD`. These tell the type checker the target OS of a host.
- Change "Property NoInfo" to "Property UnixLike"
- Change "Property HasInfo" to "Property (HasInfo + UnixLike)"
- Change "RevertableProperty NoInfo" to
"RevertableProperty UnixLike UnixLike"
- Change "RevertableProperty HasInfo" to
"RevertableProperty (HasInfo + UnixLike) UnixLike"
- GHC needs {-# LANGUAGE TypeOperators #-} to use these fancy types.
This is enabled by default for all modules in propellor.cabal. But
if you are using propellor as a library, you may need to enable it
manually.
- If you know a property only works on a particular OS, like Debian
or FreeBSD, use that instead of "UnixLike". For example:
"Property Debian"
- It's also possible make a property support a set of OS's, for example:
"Property (Debian + FreeBSD)"
- Removed `infoProperty` and `simpleProperty` constructors, instead use
`property` to construct a Property.
- Due to the polymorphic type returned by `property`, additional type
signatures tend to be needed when using it. For example, this will
fail to type check, because the type checker cannot guess what type
you intend the intermediate property "go" to have:
foo :: Property UnixLike
foo = go `requires` bar
where
go = property "foo" (return NoChange)
To fix, specify the type of go:
go :: Property UnixLike
- `ensureProperty` now needs to be passed a witness to the type of the
property it's used in.
change this: foo = property desc $ ... ensureProperty bar
to this: foo = property' desc $ \w -> ... ensureProperty w bar
- General purpose properties like cmdProperty have type "Property UnixLike".
When using that to run a command only available on Debian, you can
tighten the type to only the OS that your more specific property works on.
For example:
upgraded :: Property Debian
upgraded = tightenTargets (cmdProperty "apt-get" ["upgrade"])
- Several utility functions have been renamed:
getInfo to fromInfo
propertyInfo to getInfo
propertyDesc to getDesc
propertyChildren to getChildren
* The new `pickOS` property combinator can be used to combine different
properties, supporting different OS's, into one Property that chooses
which to use based on the Host's OS.
* Re-enabled -O0 in propellor.cabal to reign in ghc's memory use handling
these complex new types.
* Added dependency on concurrent-output; removed embedded copy.
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