Package org.eclipse.jgit.util

Class FS

  • Direct Known Subclasses:
    FS_POSIX, FS_Win32
    public abstract class FS
extends Object
    Abstraction to support various file system operations not in Java.

    • Field Detail

      • DETECTED

        public static final FS DETECTED
        The auto-detected implementation selected for this operating system and JRE.

    • Constructor Detail

      • FS

        protected FS()
        Constructs a file system abstraction.

      • FS

        protected FS​(FS src)
        Initialize this FS using another's current settings.
        Parameters:
        src - the source FS to copy from.

    • Method Detail

      • detect

        public static FS detect()
        Auto-detect the appropriate file system abstraction.
        Returns:
        detected file system abstraction

      • setAsyncFileStoreAttributes

        @Deprecated
public static void setAsyncFileStoreAttributes​(boolean asynch)
        Deprecated.
        Use FS.FileStoreAttributes.setBackground(boolean) instead
        Whether FileStore attributes should be determined asynchronously
        Parameters:
        asynch - whether FileStore attributes should be determined asynchronously. If false access to cached attributes may block for some seconds for the first call per FileStore
        Since:
        5.1.9

      • detect

        public static FS detect​(Boolean cygwinUsed)
        Auto-detect the appropriate file system abstraction, taking into account the presence of a Cygwin installation on the system. Using jgit in combination with Cygwin requires a more elaborate (and possibly slower) resolution of file system paths.
        Parameters:
        cygwinUsed -
        • Boolean.TRUE to assume that Cygwin is used in combination with jgit
        • Boolean.FALSE to assume that Cygwin is not used with jgit
        • null to auto-detect whether a Cygwin installation is present on the system and in this case assume that Cygwin is used
        Note: this parameter is only relevant on Windows.
        Returns:
        detected file system abstraction

      • getFileStoreAttributes

        public static FS.FileStoreAttributes getFileStoreAttributes​(@NonNull
                                                            Path dir)
        Get cached FileStore attributes, if not yet available measure them using a probe file under the given directory.
        Parameters:
        dir - the directory under which the probe file will be created to measure the timer resolution.
        Returns:
        measured filesystem timestamp resolution
        Since:
        5.1.9

      • newInstance

        public abstract FS newInstance()
        Create a new instance of the same type of FS.
        Returns:
        a new instance of the same type of FS.

      • supportsExecute

        public abstract boolean supportsExecute()
        Does this operating system and JRE support the execute flag on files?
        Returns:
        true if this implementation can provide reasonably accurate executable bit information; false otherwise.

      • supportsAtomicCreateNewFile

        public boolean supportsAtomicCreateNewFile()
        Does this file system support atomic file creation via java.io.File#createNewFile()? In certain environments (e.g. on NFS) it is not guaranteed that when two file system clients run createNewFile() in parallel only one will succeed. In such cases both clients may think they created a new file.
        Returns:
        true if this implementation support atomic creation of new Files by File.createNewFile()
        Since:
        4.5

      • supportsSymlinks

        public boolean supportsSymlinks()
        Does this operating system and JRE supports symbolic links. The capability to handle symbolic links is detected at runtime.
        Returns:
        true if symbolic links may be used
        Since:
        3.0

      • isCaseSensitive

        public abstract boolean isCaseSensitive()
        Is this file system case sensitive
        Returns:
        true if this implementation is case sensitive

      • canExecute

        public abstract boolean canExecute​(File f)
        Determine if the file is executable (or not).

        Not all platforms and JREs support executable flags on files. If the feature is unsupported this method will always return false.

        If the platform supports symbolic links and f is a symbolic link this method returns false, rather than the state of the executable flags on the target file.

        Parameters:
        f - abstract path to test.
        Returns:
        true if the file is believed to be executable by the user.

      • setExecute

        public abstract boolean setExecute​(File f,
                                   boolean canExec)
        Set a file to be executable by the user.

        Not all platforms and JREs support executable flags on files. If the feature is unsupported this method will always return false and no changes will be made to the file specified.

        Parameters:
        f - path to modify the executable status of.
        canExec - true to enable execution; false to disable it.
        Returns:
        true if the change succeeded; false otherwise.

      • lastModified

        @Deprecated
public long lastModified​(File f)
                  throws IOException
        Deprecated.
        use lastModifiedInstant(Path) instead
        Get the last modified time of a file system object. If the OS/JRE support symbolic links, the modification time of the link is returned, rather than that of the link target.
        Parameters:
        f - a File object.
        Returns:
        last modified time of f
        Throws:
        IOException
        Since:
        3.0

      • lastModifiedInstant

        public Instant lastModifiedInstant​(Path p)
        Get the last modified time of a file system object. If the OS/JRE support symbolic links, the modification time of the link is returned, rather than that of the link target.
        Parameters:
        p - a Path object.
        Returns:
        last modified time of p
        Since:
        5.1.9

      • lastModifiedInstant

        public Instant lastModifiedInstant​(File f)
        Get the last modified time of a file system object. If the OS/JRE support symbolic links, the modification time of the link is returned, rather than that of the link target.
        Parameters:
        f - a File object.
        Returns:
        last modified time of p
        Since:
        5.1.9

      • setLastModified

        @Deprecated
public void setLastModified​(File f,
                            long time)
                     throws IOException
        Deprecated.
        use setLastModified(Path, Instant) instead
        Set the last modified time of a file system object.

        For symlinks it sets the modified time of the link target.

        Parameters:
        f - a File object.
        time - last modified time
        Throws:
        IOException
        Since:
        3.0

      • setLastModified

        public void setLastModified​(Path p,
                            Instant time)
                     throws IOException
        Set the last modified time of a file system object.

        For symlinks it sets the modified time of the link target.

        Parameters:
        p - a Path object.
        time - last modified time
        Throws:
        IOException
        Since:
        5.1.9

      • length

        public long length​(File path)
            throws IOException
        Get the length of a file or link, If the OS/JRE supports symbolic links it's the length of the link, else the length of the target.
        Parameters:
        path - a File object.
        Returns:
        length of a file
        Throws:
        IOException
        Since:
        3.0

      • delete

        public void delete​(File f)
            throws IOException
        Delete a file. Throws an exception if delete fails.
        Parameters:
        f - a File object.
        Throws:
        IOException - this may be a Java7 subclass with detailed information
        Since:
        3.3

      • resolve

        public File resolve​(File dir,
                    String name)
        Resolve this file to its actual path name that the JRE can use.

        This method can be relatively expensive. Computing a translation may require forking an external process per path name translated. Callers should try to minimize the number of translations necessary by caching the results.

        Not all platforms and JREs require path name translation. Currently only Cygwin on Win32 require translation for Cygwin based paths.

        Parameters:
        dir - directory relative to which the path name is.
        name - path name to translate.
        Returns:
        the translated path. new File(dir,name) if this platform does not require path name translation.

      • userHome

        public File userHome()
        Determine the user's home directory (location where preferences are).

        This method can be expensive on the first invocation if path name translation is required. Subsequent invocations return a cached result.

        Not all platforms and JREs require path name translation. Currently only Cygwin on Win32 requires translation of the Cygwin HOME directory.

        Returns:
        the user's home directory; null if the user does not have one.

      • setUserHome

        public FS setUserHome​(File path)
        Set the user's home directory location.
        Parameters:
        path - the location of the user's preferences; null if there is no home directory for the current user.
        Returns:
        this.

      • retryFailedLockFileCommit

        public abstract boolean retryFailedLockFileCommit()
        Does this file system have problems with atomic renames?
        Returns:
        true if the caller should retry a failed rename of a lock file.

      • userHomeImpl

        protected File userHomeImpl()
        Determine the user's home directory (location where preferences are).
        Returns:
        the user's home directory; null if the user does not have one.

      • searchPath

        protected static File searchPath​(String path,
                                 String... lookFor)
        Searches the given path to see if it contains one of the given files. Returns the first it finds which is executable. Returns null if not found or if path is null.
        Parameters:
        path - List of paths to search separated by File.pathSeparator
        lookFor - Files to search for in the given path
        Returns:
        the first match found, or null
        Since:
        3.0

      • readPipe

        @Nullable
protected static String readPipe​(File dir,
                                 String[] command,
                                 String encoding)
                          throws CommandFailedException
        Execute a command and return a single line of output as a String
        Parameters:
        dir - Working directory for the command
        command - as component array
        encoding - to be used to parse the command's output
        Returns:
        the one-line output of the command or null if there is none
        Throws:
        CommandFailedException - thrown when the command failed (return code was non-zero)

      • readPipe

        @Nullable
protected static String readPipe​(File dir,
                                 String[] command,
                                 String encoding,
                                 Map<String,​String> env)
                          throws CommandFailedException
        Execute a command and return a single line of output as a String
        Parameters:
        dir - Working directory for the command
        command - as component array
        encoding - to be used to parse the command's output
        env - Map of environment variables to be merged with those of the current process
        Returns:
        the one-line output of the command or null if there is none
        Throws:
        CommandFailedException - thrown when the command failed (return code was non-zero)
        Since:
        4.0

      • discoverGitExe

        protected abstract File discoverGitExe()
        Discover the path to the Git executable.
        Returns:
        the path to the Git executable or null if it cannot be determined.
        Since:
        4.0

      • discoverGitSystemConfig

        protected File discoverGitSystemConfig()
        Discover the path to the system-wide Git configuration file
        Returns:
        the path to the system-wide Git configuration file or null if it cannot be determined.
        Since:
        4.0

      • getGitSystemConfig

        public File getGitSystemConfig()
        Get the currently used path to the system-wide Git configuration file.
        Returns:
        the currently used path to the system-wide Git configuration file or null if none has been set.
        Since:
        4.0

      • setGitSystemConfig

        public FS setGitSystemConfig​(File configFile)
        Set the path to the system-wide Git configuration file to use.
        Parameters:
        configFile - the path to the config file.
        Returns:
        this
        Since:
        4.0

      • resolveGrandparentFile

        protected static File resolveGrandparentFile​(File grandchild)
        Get the parent directory of this file's parent directory
        Parameters:
        grandchild - a File object.
        Returns:
        the parent directory of this file's parent directory or null in case there's no grandparent directory
        Since:
        4.0

      • readSymLink

        public String readSymLink​(File path)
                   throws IOException
        Check if a file is a symbolic link and read it
        Parameters:
        path - a File object.
        Returns:
        target of link or null
        Throws:
        IOException
        Since:
        3.0

      • isSymLink

        public boolean isSymLink​(File path)
                  throws IOException
        Whether the path is a symbolic link (and we support these).
        Parameters:
        path - a File object.
        Returns:
        true if the path is a symbolic link (and we support these)
        Throws:
        IOException
        Since:
        3.0

      • exists

        public boolean exists​(File path)
        Tests if the path exists, in case of a symbolic link, true even if the target does not exist
        Parameters:
        path - a File object.
        Returns:
        true if path exists
        Since:
        3.0

      • isDirectory

        public boolean isDirectory​(File path)
        Check if path is a directory. If the OS/JRE supports symbolic links and path is a symbolic link to a directory, this method returns false.
        Parameters:
        path - a File object.
        Returns:
        true if file is a directory,
        Since:
        3.0

      • isFile

        public boolean isFile​(File path)
        Examine if path represents a regular file. If the OS/JRE supports symbolic links the test returns false if path represents a symbolic link.
        Parameters:
        path - a File object.
        Returns:
        true if path represents a regular file
        Since:
        3.0

      • isHidden

        public boolean isHidden​(File path)
                 throws IOException
        Whether path is hidden, either starts with . on unix or has the hidden attribute in windows
        Parameters:
        path - a File object.
        Returns:
        true if path is hidden, either starts with . on unix or has the hidden attribute in windows
        Throws:
        IOException
        Since:
        3.0

      • setHidden

        public void setHidden​(File path,
                      boolean hidden)
               throws IOException
        Set the hidden attribute for file whose name starts with a period.
        Parameters:
        path - a File object.
        hidden - whether to set the file hidden
        Throws:
        IOException
        Since:
        3.0

      • createSymLink

        public void createSymLink​(File path,
                          String target)
                   throws IOException
        Create a symbolic link
        Parameters:
        path - a File object.
        target - target path of the symlink
        Throws:
        IOException
        Since:
        3.0

      • list

        public WorkingTreeIterator.Entry[] list​(File directory,
                                        FileTreeIterator.FileModeStrategy fileModeStrategy)
        Enumerates children of a directory.
        Parameters:
        directory - to get the children of
        fileModeStrategy - to use to calculate the git mode of a child
        Returns:
        an array of entries for the children
        Since:
        5.0

      • runHookIfPresent

        public ProcessResult runHookIfPresent​(Repository repository,
                                      String hookName,
                                      String[] args)
                               throws JGitInternalException
        Checks whether the given hook is defined for the given repository, then runs it with the given arguments.

        The hook's standard output and error streams will be redirected to System.out and System.err respectively. The hook will have no stdin.

        Parameters:
        repository - The repository for which a hook should be run.
        hookName - The name of the hook to be executed.
        args - Arguments to pass to this hook. Cannot be null, but can be an empty array.
        Returns:
        The ProcessResult describing this hook's execution.
        Throws:
        JGitInternalException - if we fail to run the hook somehow. Causes may include an interrupted process or I/O errors.
        Since:
        4.0

      • runHookIfPresent

        public ProcessResult runHookIfPresent​(Repository repository,
                                      String hookName,
                                      String[] args,
                                      OutputStream outRedirect,
                                      OutputStream errRedirect,
                                      String stdinArgs)
                               throws JGitInternalException
        Checks whether the given hook is defined for the given repository, then runs it with the given arguments.
        Parameters:
        repository - The repository for which a hook should be run.
        hookName - The name of the hook to be executed.
        args - Arguments to pass to this hook. Cannot be null, but can be an empty array.
        outRedirect - A print stream on which to redirect the hook's stdout. Can be null, in which case the hook's standard output will be lost.
        errRedirect - A print stream on which to redirect the hook's stderr. Can be null, in which case the hook's standard error will be lost.
        stdinArgs - A string to pass on to the standard input of the hook. May be null.
        Returns:
        The ProcessResult describing this hook's execution.
        Throws:
        JGitInternalException - if we fail to run the hook somehow. Causes may include an interrupted process or I/O errors.
        Since:
        5.11

      • internalRunHookIfPresent

        protected ProcessResult internalRunHookIfPresent​(Repository repository,
                                                 String hookName,
                                                 String[] args,
                                                 OutputStream outRedirect,
                                                 OutputStream errRedirect,
                                                 String stdinArgs)
                                          throws JGitInternalException
        See runHookIfPresent(Repository, String, String[], OutputStream, OutputStream, String) . Should only be called by FS supporting shell scripts execution.
        Parameters:
        repository - The repository for which a hook should be run.
        hookName - The name of the hook to be executed.
        args - Arguments to pass to this hook. Cannot be null, but can be an empty array.
        outRedirect - A print stream on which to redirect the hook's stdout. Can be null, in which case the hook's standard output will be lost.
        errRedirect - A print stream on which to redirect the hook's stderr. Can be null, in which case the hook's standard error will be lost.
        stdinArgs - A string to pass on to the standard input of the hook. May be null.
        Returns:
        The ProcessResult describing this hook's execution.
        Throws:
        JGitInternalException - if we fail to run the hook somehow. Causes may include an interrupted process or I/O errors.
        Since:
        5.11

      • findHook

        public File findHook​(Repository repository,
                     String hookName)
        Tries to find a hook matching the given one in the given repository.
        Parameters:
        repository - The repository within which to find a hook.
        hookName - The name of the hook we're trying to find.
        Returns:
        The File containing this particular hook if it exists in the given repository, null otherwise.
        Since:
        4.0

      • runProcess

        public int runProcess​(ProcessBuilder processBuilder,
                      OutputStream outRedirect,
                      OutputStream errRedirect,
                      String stdinArgs)
               throws IOException,
                      InterruptedException
        Runs the given process until termination, clearing its stdout and stderr streams on-the-fly.
        Parameters:
        processBuilder - The process builder configured for this process.
        outRedirect - A OutputStream on which to redirect the processes stdout. Can be null, in which case the processes standard output will be lost.
        errRedirect - A OutputStream on which to redirect the processes stderr. Can be null, in which case the processes standard error will be lost.
        stdinArgs - A string to pass on to the standard input of the hook. Can be null.
        Returns:
        the exit value of this process.
        Throws:
        IOException - if an I/O error occurs while executing this process.
        InterruptedException - if the current thread is interrupted while waiting for the process to end.
        Since:
        4.2

      • runProcess

        public int runProcess​(ProcessBuilder processBuilder,
                      OutputStream outRedirect,
                      OutputStream errRedirect,
                      InputStream inRedirect)
               throws IOException,
                      InterruptedException
        Runs the given process until termination, clearing its stdout and stderr streams on-the-fly.
        Parameters:
        processBuilder - The process builder configured for this process.
        outRedirect - An OutputStream on which to redirect the processes stdout. Can be null, in which case the processes standard output will be lost.
        errRedirect - An OutputStream on which to redirect the processes stderr. Can be null, in which case the processes standard error will be lost.
        inRedirect - An InputStream from which to redirect the processes stdin. Can be null, in which case the process doesn't get any data over stdin. It is assumed that the whole InputStream will be consumed by the process. The method will close the inputstream after all bytes are read.
        Returns:
        the return code of this process.
        Throws:
        IOException - if an I/O error occurs while executing this process.
        InterruptedException - if the current thread is interrupted while waiting for the process to end.
        Since:
        4.2

      • runInShell

        public abstract ProcessBuilder runInShell​(String cmd,
                                          String[] args)
        Initialize a ProcessBuilder to run a command using the system shell.
        Parameters:
        cmd - command to execute. This string should originate from the end-user, and thus is platform specific.
        args - arguments to pass to command. These should be protected from shell evaluation.
        Returns:
        a partially completed process builder. Caller should finish populating directory, environment, and then start the process.

      • getAttributes

        public FS.Attributes getAttributes​(File path)
        Get the file attributes we care for.
        Parameters:
        path - a File object.
        Returns:
        the file attributes we care for.
        Since:
        3.3

      • normalize

        public File normalize​(File file)
        Normalize the unicode path to composed form.
        Parameters:
        file - a File object.
        Returns:
        NFC-format File
        Since:
        3.3

      • normalize

        public String normalize​(String name)
        Normalize the unicode path to composed form.
        Parameters:
        name - path name
        Returns:
        NFC-format string
        Since:
        3.3