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-rw-r--r--src/Propellor/Property/Apt.hs91
1 files changed, 91 insertions, 0 deletions
diff --git a/src/Propellor/Property/Apt.hs b/src/Propellor/Property/Apt.hs
index c0d4ac82..8539c4a6 100644
--- a/src/Propellor/Property/Apt.hs
+++ b/src/Propellor/Property/Apt.hs
@@ -100,6 +100,59 @@ stdSourcesList' suite more = tightenTargets $ setSourcesList
where
generators = [debCdn, kernelOrg, securityUpdates] ++ more
+type PinPriority = Int
+
+-- | Adds an apt source for a suite, and pins that suite to a given pin value
+-- (see apt_preferences(5)). Revert to drop the source and unpin the suite.
+--
+-- If the requested suite is the host's OS suite, the suite is pinned, but no
+-- source is added. That apt source should already be available, or you can use
+-- a property like 'Apt.stdSourcesList'.
+suiteAvailablePinned
+ :: DebianSuite
+ -> PinPriority
+ -> RevertableProperty Debian Debian
+suiteAvailablePinned s pin = available <!> unavailable
+ where
+ available :: Property Debian
+ available = tightenTargets $ combineProperties (desc True) $ props
+ & File.hasContent prefFile
+ [ "Package: *"
+ , "Pin: release " ++ suitePin s
+ , "Pin-Priority: " ++ show pin
+ ]
+ & setSourcesFile
+
+ unavailable :: Property Debian
+ unavailable = tightenTargets $ combineProperties (desc False) $ props
+ & File.notPresent sourcesFile
+ `onChange` update
+ & File.notPresent prefFile
+
+ setSourcesFile :: Property Debian
+ setSourcesFile = withOS (desc True) $ \w o -> case o of
+ (Just (System (Debian _ hostSuite) _))
+ | s /= hostSuite -> ensureProperty w $
+ File.hasContent sourcesFile sources
+ `onChange` update
+ _ -> noChange
+
+ -- Unless we are pinning a backports suite, filter out any backports
+ -- sources that were added by our generators. The user probably doesn't
+ -- want those to be pinned to the same value
+ sources = dropBackports $ concatMap (\gen -> gen s) generators
+ where
+ dropBackports
+ | "-backports" `isSuffixOf` (showSuite s) = id
+ | otherwise = filter (not . isInfixOf "-backports")
+
+ generators = [debCdn, kernelOrg, securityUpdates]
+ prefFile = "/etc/apt/preferences.d/20" ++ showSuite s ++ ".pref"
+ sourcesFile = "/etc/apt/sources.list.d/" ++ showSuite s ++ ".list"
+
+ desc True = "Debian " ++ showSuite s ++ " pinned, priority " ++ show pin
+ desc False = "Debian " ++ showSuite s ++ " not pinned"
+
setSourcesList :: [Line] -> Property DebianLike
setSourcesList ls = sourcesList `File.hasContent` ls `onChange` update
@@ -196,6 +249,38 @@ buildDepIn dir = cmdPropertyEnv "sh" ["-c", cmd] noninteractiveEnv
where
cmd = "cd '" ++ dir ++ "' && mk-build-deps debian/control --install --tool 'apt-get -y --no-install-recommends' --remove"
+-- | Pins a list of packages, package wildcards and/or regular expressions to a
+-- given suite with a given pin priority (see apt_preferences(5)). Revert to
+-- unpin.
+--
+-- Note that this will have no effect unless there is an apt source for the
+-- suite. One way to add an apt source is 'Apt.suiteAvailablePinned'.
+--
+-- For example, to obtain all Emacs Lisp addon packages from sid, you could use
+--
+-- > & Apt.suiteAvailablePinned Unstable (-10)
+-- > & ["elpa-*"] `Apt.pinnedTo` (Unstable, 990)
+pinnedTo
+ :: [String]
+ -> (DebianSuite, PinPriority)
+ -> RevertableProperty UnixLike UnixLike
+pinnedTo ps (suite, pin) = (\p -> pinnedTo' p (suite, pin)) `applyToList` ps
+ `describe` unwords (("pinned to " ++ showSuite suite):ps)
+
+pinnedTo'
+ :: String
+ -> (DebianSuite, PinPriority)
+ -> RevertableProperty UnixLike UnixLike
+pinnedTo' p (suite, pin) =
+ "/etc/apt/preferences.d/10propellor.pref" `File.containsBlock`
+ [ "Package: " ++ p
+ , "Pin: release " ++ suitePin suite
+ , "Pin-Priority: " ++ show pin
+ , ""
+ ]
+
+-- TODO should be RevertableProperty Debian Debian
+
-- | Package installation may fail becuse the archive has changed.
-- Run an update in that case and retry.
robustly :: Property DebianLike -> Property DebianLike
@@ -354,5 +439,11 @@ noPDiffs :: Property DebianLike
noPDiffs = tightenTargets $ "/etc/apt/apt.conf.d/20pdiffs" `File.hasContent`
[ "Acquire::PDiffs \"false\";" ]
+suitePin :: DebianSuite -> String
+suitePin s = prefix s ++ showSuite s
+ where
+ prefix (Stable _) = "n="
+ prefix _ = "a="
+
dpkgStatus :: FilePath
dpkgStatus = "/var/lib/dpkg/status"