64 lines
1.9 KiB
Haskell
64 lines
1.9 KiB
Haskell
{- git-annex program path
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-
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- Copyright 2013-2020 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 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 System.Environment (getExecutablePath)
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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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-> (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 ps f a = do
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cmd <- liftIO programPath
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pidLockChildProcess cmd ps f a
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