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propellor 4.0.0 released with [[!toggle text="these changes"]]
[[!toggleable text="""
* Added Monoid instances for Property and RevertableProperty.
* Removed applyToList. Instead, use mconcat. (API change)
If you had: applyToList accountFor [User "joey", User "root"]
use instead: mconcat (map accountFor [User "joey", User "root"])
* Makefile: Removed "run" target which was default target.
"make" now only builds propellor, does not run it.
Note that propellor 1.0.0 and earlier relied on this target for
the Cron.runPropellor property's cronjob to work, so upgrading
directly from 1.0.0 to 4.0.0 would break that cron job.
* Remove make from propellor's dependency list; it's not used by
propellor any longer.
* Implemented hostChroot, as originally seen in my slides at
Linux.Conf.Au 2017 in January. Now that it's not vaporware, it allows
one Host to build a disk image that has all the properties of another
Host.
* DiskImage building properties used to propagate DNS info out from
the chroot used to build the disk image to the Host. That is no longer
done, since that chroot only exists as a side effect of the disk image
creation and servers will not be running in it.
* The IsInfo types class's propagateInfo function changed to use a
PropagateInfo data type. (API change)
* The action used to satisfy a property changed to Maybe (Propellor Result).
When it is Nothing, propellor knows it can skip displaying the
description of that property. This is mostly useful in the
implementation of mempty. (API change)
* The doNothing property is now simply mempty. The name was retained
because it can be clearer than mempty in some contexts.
* Added Apache.confEnabled."""]]
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