947d2a10bc
ghc 8.8.4 seems to have changed something that broke code that has been successfully using forkProcess since 2012. Likely a change to GC internals. Since forkProcess has never had clear documentation about how to use it safely, avoid using it at all. Instead, when git-annex needs to daemonize itself, re-run the git-annex command, in a new process group and session. This commit was sponsored by Luke Shumaker on Patreon.
99 lines
3.1 KiB
Haskell
99 lines
3.1 KiB
Haskell
{- git-annex program path
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-
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- Copyright 2013-2021 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU AGPL version 3 or higher.
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-}
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module Annex.Path (
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programPath,
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readProgramFile,
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gitAnnexChildProcess,
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gitAnnexChildProcessParams,
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gitAnnexDaemonizeParams,
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) where
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import Annex.Common
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import Config.Files
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import Utility.Env
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import Annex.PidLock
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import qualified Annex
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import System.Environment (getExecutablePath, getArgs)
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{- A fully qualified path to the currently running git-annex program.
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-
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- getExecutablePath is used when possible. On OSs it supports
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- well, it returns the complete path to the program. But, on other OSs,
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- it might return just the basename. Fall back to reading the programFile,
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- or searching for the command name in PATH.
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-
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- The standalone build runs git-annex via ld.so, and defeats
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- getExecutablePath. It sets GIT_ANNEX_PROGRAMPATH to the correct path
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- to the wrapper script to use.
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-}
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programPath :: IO FilePath
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programPath = go =<< getEnv "GIT_ANNEX_PROGRAMPATH"
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where
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go (Just p) = return p
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go Nothing = do
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exe <- getExecutablePath
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p <- if isAbsolute exe
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then return exe
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else fromMaybe exe <$> readProgramFile
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maybe cannotFindProgram return =<< searchPath p
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{- Returns the path for git-annex that is recorded in the programFile. -}
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readProgramFile :: IO (Maybe FilePath)
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readProgramFile = do
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programfile <- programFile
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headMaybe . lines <$> readFile programfile
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cannotFindProgram :: IO a
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cannotFindProgram = do
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f <- programFile
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giveup $ "cannot find git-annex program in PATH or in " ++ f
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{- Runs a git-annex child process.
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-
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- Like runsGitAnnexChildProcessViaGit, when pid locking is in use,
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- this takes the pid lock, while running it, and sets an env var
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- that prevents the child process trying to take the pid lock,
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- to avoid it deadlocking.
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-}
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gitAnnexChildProcess
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:: String
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-> [CommandParam]
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-> (CreateProcess -> CreateProcess)
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-> (Maybe Handle -> Maybe Handle -> Maybe Handle -> ProcessHandle -> IO a)
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-> Annex a
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gitAnnexChildProcess subcmd ps f a = do
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cmd <- liftIO programPath
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ps' <- gitAnnexChildProcessParams subcmd ps
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pidLockChildProcess cmd ps' f a
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{- Parameters to pass to a git-annex child process to run a subcommand
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- with some parameters.
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-
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- Includes -c values that were passed on the git-annex command line
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- or due to options like --debug being enabled.
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-}
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gitAnnexChildProcessParams :: String -> [CommandParam] -> Annex [CommandParam]
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gitAnnexChildProcessParams subcmd ps = do
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cps <- gitAnnexGitConfigOverrides
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return (Param subcmd : cps ++ ps)
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gitAnnexGitConfigOverrides :: Annex [CommandParam]
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gitAnnexGitConfigOverrides = concatMap (\c -> [Param "-c", Param c])
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<$> Annex.getGitConfigOverrides
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{- Parameters to pass to git-annex when re-running the current command
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- to daemonize it. Used with Utility.Daemon.daemonize. -}
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gitAnnexDaemonizeParams :: Annex [CommandParam]
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gitAnnexDaemonizeParams = do
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-- This inclues -c parameters passed to git, as well as ones
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-- passed to git-annex.
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cps <- gitAnnexGitConfigOverrides
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-- Get every parameter git-annex was run with.
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ps <- liftIO getArgs
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return (map Param ps ++ cps)
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