% Copyright (C) 2002-2005 David Roundy % % This program is free software; you can redistribute it and/or modify % it under the terms of the GNU General Public License as published by % the Free Software Foundation; either version 2, or (at your option) % any later version. % % This program is distributed in the hope that it will be useful, % but WITHOUT ANY WARRANTY; without even the implied warranty of % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the % GNU General Public License for more details. % % You should have received a copy of the GNU General Public License % along with this program; see the file COPYING. If not, write to % the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, % Boston, MA 02110-1301, USA. \darcsCommand{pull} \begin{code} {-# OPTIONS_GHC -cpp #-} module Darcs.Commands.Pull ( pull, fetch ) where import System.Exit ( ExitCode(..), exitWith ) import Workaround ( getCurrentDirectory ) import Control.Monad ( when ) import Data.List ( nub ) import Data.Maybe ( fromMaybe ) import Darcs.Commands ( DarcsCommand(..), putVerbose, putInfo ) import Darcs.CommandsAux ( checkPaths ) import Darcs.Arguments ( DarcsFlag( Verbose, DryRun, MarkConflicts, Intersection, Complement, AllowConflicts, NoAllowConflicts, XMLOutput ), nocompress, ignoretimes, definePatches, depsSel, pullConflictOptions, useExternalMerge, matchSeveral, fixUrl, allInteractive, repoCombinator, printDryRunMessageAndExit, test, dryRun, setDefault, summary, workingRepoDir, remoteRepo, setScriptsExecutableOption, nolinks, networkOptions, umaskOption, allowUnrelatedRepos, restrictPaths, changesReverse, getOutput, output ) import Darcs.Flags( doReverse ) import Darcs.Repository ( Repository, identifyRepositoryFor, withGutsOf, amInRepository, withRepoLock, ($-), tentativelyMergePatches, finalizeRepositoryChanges, applyToWorking, readRepo, checkUnrelatedRepos, invalidateIndex, modifyCache, modifyCache, HashedDir(..), Cache(..), CacheLoc(..), WritableOrNot(..)) import qualified Darcs.Repository.Cache as DarcsCache import Darcs.Repository.Merge import Darcs.Hopefully ( info, hopefully, patchDesc ) import Darcs.Patch ( RepoPatch, description ) import Darcs.Patch.Info ( PatchInfo ) import Darcs.Patch.Bundle( makeBundleN, patchFilename ) import Darcs.Hopefully ( PatchInfoAnd ) #ifdef GADT_WITNESSES import Darcs.Patch.Set ( Origin ) #endif import Darcs.Patch.Set ( PatchSet(..), SealedPatchSet, newset2FL ) import Darcs.Witnesses.Ordered ( (:>)(..), (:\/:)(..), FL(..), RL(..), (:>>)(..) , mapFL, nullFL, reverseFL, mapFL_FL, unsafeCoercePEnd ) import Darcs.Patch.Permutations ( partitionFL ) import Darcs.Repository.Prefs ( addToPreflist, defaultrepo, setDefaultrepo, getPreflist ) import Darcs.Repository.Motd (showMotd ) import Darcs.Patch.Depends ( findUncommon, findCommonWithThem, newsetIntersection, newsetUnion ) import Darcs.SelectChanges ( selectChanges, WhichChanges(..), filterOutConflicts, runSelection, selectionContext) import Darcs.Utils ( clarifyErrors, formatPath ) import Darcs.Witnesses.Sealed ( Sealed(..), seal ) import Printer ( putDocLn, vcat, ($$), text, putDoc ) import Darcs.Lock ( writeDocBinFile ) import Darcs.RepoPath ( useAbsoluteOrStd, stdOut ) #include "impossible.h" #include "gadts.h" pullDescription :: String pullDescription = "Copy and apply patches from another repository to this one." fetchDescription :: String fetchDescription = "Fetch patches from another repository, but don't apply them." pullHelp :: String pullHelp = "Pull is used to bring changes made in another repository into the current\n"++ "repository (that is, either the one in the current directory, or the one\n"++ "specified with the --repodir option). Pull allows you to bring over all or\n"++ "some of the patches that are in that repository but not in this one. Pull\n"++ "accepts arguments, which are URLs from which to pull, and when called\n"++ "without an argument, pull will use the repository from which you have most\n"++ "recently either pushed or pulled.\n" fetchHelp :: String fetchHelp = "fetch is used to bring changes made in another repository\n" ++ "into the current repository without actually applying\n"++ "them. Fetch allows you to bring over all or\n"++ "some of the patches that are in that repository but not in this one. Fetch\n"++ "accepts arguments, which are URLs from which to fetch, and when called\n"++ "without an argument, fetch will use the repository from which you have most\n"++ "recently either pushed or pulled.\n"++ "The fetched patches are stored into a patch bundle, to be later\n" ++ "applied using \"darcs apply\"." fetch :: DarcsCommand fetch = DarcsCommand { commandName = "fetch", commandHelp = fetchHelp, commandDescription = fetchDescription, commandExtraArgs = -1, commandExtraArgHelp = ["[REPOSITORY]..."], commandCommand = fetchCmd, commandPrereq = amInRepository, commandGetArgPossibilities = getPreflist "repos", commandArgdefaults = defaultrepo, commandAdvancedOptions = [repoCombinator, remoteRepo] ++ networkOptions, commandBasicOptions = [matchSeveral, allInteractive] ++dryRun++ [summary, depsSel, setDefault False, workingRepoDir, output, allowUnrelatedRepos]} pull :: DarcsCommand pull = DarcsCommand {commandName = "pull", commandHelp = pullHelp, commandDescription = pullDescription, commandExtraArgs = -1, commandExtraArgHelp = ["[REPOSITORY]..."], commandCommand = pullCmd, commandPrereq = amInRepository, commandGetArgPossibilities = getPreflist "repos", commandArgdefaults = defaultrepo, commandAdvancedOptions = [repoCombinator, nocompress, nolinks, ignoretimes, remoteRepo, setScriptsExecutableOption, umaskOption, restrictPaths, changesReverse ] ++ networkOptions, commandBasicOptions = [matchSeveral, allInteractive, pullConflictOptions, useExternalMerge, test]++dryRun++[summary, depsSel, setDefault False, workingRepoDir, allowUnrelatedRepos]} mergeOpts :: [DarcsFlag] -> [DarcsFlag] mergeOpts opts | NoAllowConflicts `elem` opts = opts | AllowConflicts `elem` opts = opts | otherwise = MarkConflicts : opts pullCmd :: [DarcsFlag] -> [String] -> IO () pullCmd opts repos = do pullingFrom <- mapM (fixUrl opts) repos withRepoLock opts $- \ initRepo -> do let repository = modifyCache initRepo $ addReposToCache pullingFrom r <- fetchPatches opts' repos "pull" repository applyPatches opts' repository r where opts' = mergeOpts opts addReposToCache repos (Ca cache) = Ca $ [ toReadOnlyCache r | r <- repos ] ++ cache toReadOnlyCache = Cache DarcsCache.Repo NotWritable fetchCmd :: [DarcsFlag] -> [String] -> IO () fetchCmd opts repos = withRepoLock opts $- \ repository -> fetchPatches opts repos "fetch" repository >>= makeBundle opts fetchPatches :: FORALL(p r u t) (RepoPatch p) => [DarcsFlag] -> [String] -> String -> Repository p C(r u r) -> IO ( SealedPatchSet p C(Origin), Sealed ((FL (PatchInfoAnd p) :\/: FL (PatchInfoAnd p)) C(r))) fetchPatches opts unfixedrepodirs@(_:_) jobname repository = do here <- getCurrentDirectory repodirs <- (nub . filter (/= here)) `fmap` mapM (fixUrl opts) unfixedrepodirs -- Test to make sure we aren't trying to pull from the current repo when (null repodirs) $ fail "Can't pull from current repository!" old_default <- getPreflist "defaultrepo" when (old_default == repodirs && not (XMLOutput `elem` opts)) $ let pulling = if DryRun `elem` opts then "Would pull" else "Pulling" in putInfo opts $ text $ pulling++" from "++concatMap formatPath repodirs++"..." (Sealed them, Sealed compl) <- readRepos repository opts repodirs setDefaultrepo (head repodirs) opts mapM_ (addToPreflist "repos") repodirs mapM_ (showMotd opts) repodirs us <- readRepo repository checkUnrelatedRepos opts us them common :>> _ <- return $ findCommonWithThem us them us' :\/: them' <- return $ findUncommon us them _ :\/: compl' <- return $ findUncommon us compl let avoided = mapFL info compl' ps :> _ <- return $ partitionFL (not . (`elem` avoided) . info) them' when (Verbose `elem` opts) $ do case us' of (x@(_:>:_)) -> putDocLn $ text "We have the following new (to them) patches:" $$ (vcat $ mapFL description x) _ -> return () when (not $ nullFL ps) $ putDocLn $ text "They have the following patches to pull:" $$ (vcat $ mapFL description ps) (hadConflicts, Sealed psFiltered) <- filterOutConflicts opts (reverseFL us') repository ps when hadConflicts $ putStrLn "Skipping some patches which would cause conflicts." when (nullFL psFiltered) $ do putInfo opts $ text "No remote changes to pull in!" definePatches psFiltered exitWith ExitSuccess let context = selectionContext jobname opts Nothing [] selector = if doReverse opts then selectChanges FirstReversed else selectChanges First (to_be_pulled :> _) <- runSelection (selector psFiltered) $ context return (seal common, seal $ us' :\/: to_be_pulled) fetchPatches _ [] jobname _ = fail $ "No default repository to " ++ jobname ++ " from, please specify one" applyPatches :: forall p C(r u t a). (RepoPatch p) => [DarcsFlag] -> Repository p C(r u r) -> (SealedPatchSet p C(Origin), Sealed ((FL (PatchInfoAnd p) :\/: FL (PatchInfoAnd p)) C(r))) -> IO () applyPatches opts repository (_, Sealed (us' :\/: to_be_pulled)) = do printDryRunMessageAndExit "pull" opts to_be_pulled definePatches to_be_pulled when (nullFL to_be_pulled) $ do putStrLn "You don't want to pull any patches, and that's fine with me!" exitWith ExitSuccess checkPaths opts to_be_pulled putVerbose opts $ text "Getting and merging the following patches:" putVerbose opts $ vcat $ mapFL description to_be_pulled Sealed pw <- tentativelyMergePatches repository "pull" opts us' to_be_pulled invalidateIndex repository withGutsOf repository $ do finalizeRepositoryChanges repository revertable $ applyToWorking repository opts pw return () putInfo opts $ text "Finished pulling and applying." makeBundle :: forall p C(r u t x) . (RepoPatch p) => [DarcsFlag] -> (SealedPatchSet p C(Origin), Sealed ((FL (PatchInfoAnd p) :\/: FL (PatchInfoAnd p)) C(r))) -> IO () makeBundle opts (Sealed common, Sealed (_ :\/: to_be_fetched)) = do bundle <- makeBundleN Nothing (unsafeCoercePEnd common) $ mapFL_FL hopefully to_be_fetched let fname = case to_be_fetched of (x:>:_)-> patchFilename $ patchDesc x o = fromMaybe stdOut (getOutput opts fname) useAbsoluteOrStd writeDocBinFile putDoc o $ bundle revertable :: IO a -> IO a revertable x = x `clarifyErrors` unlines ["Error applying patch to the working directory.","", "This may have left your working directory an inconsistent", "but recoverable state. If you had no un-recorded changes", "by using 'darcs revert' you should be able to make your", "working directory consistent again."] {- Read in the specified pull-from repositories. Perform Intersection, Union, or Complement read. In patch-theory terms (stated in set algebra, where + is union and & is intersection and \ is complement): Union = ((R1 + R2 + ... + Rn) \ Rc) Intersection = ((R1 & R2 & ... & Rn) \ Rc) Complement = (R1 \ Rc) \ ((R2 + R3 + ... + Rn) \ Rc) where Rc = local repo R1 = 1st specified pull repo R2, R3, Rn = other specified pull repo Since Rc is not provided here yet, the result of readRepos is a tuple: the first patchset(s) to be complemented against Rc and then the second patchset(s) to be complemented against Rc. -} readRepos :: RepoPatch p => Repository p C(r u t) -> [DarcsFlag] -> [String] -> IO (SealedPatchSet p C(Origin),SealedPatchSet p C(Origin)) readRepos _ _ [] = impossible readRepos to_repo opts us = do rs <- mapM (\u -> do r <- identifyRepositoryFor to_repo u ps <- readRepo r return $ seal ps) us return $ if Intersection `elem` opts then (newsetIntersection rs, seal (PatchSet NilRL NilRL)) else if Complement `elem` opts then (head rs, newsetUnion $ tail rs) else (newsetUnion rs, seal (PatchSet NilRL NilRL)) \end{code} \begin{options} --intersection, --union [DEFAULT], --complement \end{options} If you provide more than one repository as an argument to pull, darcs' behavior is determined by the presence of the \verb!--complement!, \verb!--intersection!, and \verb!--union! flags. \begin{itemize} \item The default (\verb!--union!) behavior is to pull any patches that are in any of the specified repositories ($ R_1 \bigcup R_2 \bigcup R_3 \ldots$). \item If you instead specify the \verb!--intersection! flag, darcs will only pull those patches which are present in all source repositories ($ R_1 \bigcap R_2 \bigcap R_3 \ldots$). \item If you specify the \verb!--complement! flag, darcs will only pull elements in the first repository that do not exist in any of the remaining repositories\footnote{The first thing darcs will do is remove duplicates, keeping only the first specification. This is noticeable for the complement operation, since mathematically $ S \backslash S \rightarrow \emptyset $, one would expect that ``\texttt{darcs pull --complement repo1 repo1}'' would result in no pulls, but the duplicate elimination removes the second \texttt{repo1}, reducing the above to effectively ``\texttt{darcs pull repo1}''. The expected functionality could be seen via ``\texttt{darcs get -a repo1 repo2; darcs pull --complement repo1 repo2}'', but there are easier ways of doing nothing!} ($ R_1 \backslash (R_2 \bigcup R_3 \bigcup \ldots$)). \end{itemize} \begin{options} --external-merge \end{options} You can use an external interactive merge tool to resolve conflicts with the flag \verb!--external-merge!. For more details see subsection~\ref{resolution}. \begin{options} --matches, --patches, --tags, --no-deps \end{options} The \verb!--patches!, \verb!--matches!, \verb!--tags!, and \verb!--no-deps! options can be used to select which patches to pull, as described in subsection~\ref{selecting}. \begin{options} --no-test, --test \end{options} If you specify the \verb!--test! option, pull will run the test (if a test exists) on a scratch copy of the repository contents prior to actually performing the pull. If the test fails, the pull will be aborted. \begin{options} --verbose \end{options} Adding the \verb!--verbose! option causes another section to appear in the output which also displays a summary of patches that you have and the remote repository lacks. Thus, the following syntax can be used to show you all the patch differences between two repositories: \begin{verbatim} darcs pull --dry-run --verbose \end{verbatim}