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Viewing changes to external/ngit/Sharpen.Unix/UnixFileHelper.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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external/ngit/Sharpen.Unix/UnixFileHelper.cs
 
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using System;
 
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using System.IO;
 
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using Mono.Unix;
 
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namespace Sharpen.Unix
 
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{
 
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        class UnixFileHelper : FileHelper
 
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        {
 
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                static UnixFileSystemInfo GetUnixFileInfo (string path)
 
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                {
 
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                        try {
 
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                                return Mono.Unix.UnixFileInfo.GetFileSystemEntry (path);
 
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                        } catch (DirectoryNotFoundException ex) {
 
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                                // If we have a file /foo/bar and probe the path /foo/bar/baz, we get a DirectoryNotFound exception
 
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                                // because 'bar' is a file and therefore 'baz' cannot possibly exist. This is annoying.
 
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                                var inner = ex.InnerException as UnixIOException;
 
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                                if (inner != null && inner.ErrorCode == Mono.Unix.Native.Errno.ENOTDIR)
 
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                                        return null;
 
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                                throw;
 
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                        }
 
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                }
 
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                public override bool CanExecute (FilePath path)
 
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                {
 
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                        UnixFileInfo fi = new UnixFileInfo (path);
 
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                        if (!fi.Exists)
 
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                                return false;
 
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                        return 0 != (fi.FileAccessPermissions & (FileAccessPermissions.UserExecute | FileAccessPermissions.GroupExecute | FileAccessPermissions.OtherExecute));
 
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                }
 
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                public override bool CanWrite (FilePath path)
 
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                {
 
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                        var info = GetUnixFileInfo (path);
 
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                        return info != null && info.CanAccess (Mono.Unix.Native.AccessModes.W_OK);
 
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                }
 
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                public override bool Delete (FilePath path)
 
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                {
 
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                        var info = GetUnixFileInfo (path);
 
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                        if (info != null && info.Exists) {
 
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                                try {
 
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                                        info.Delete ();
 
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                                        return true;
 
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                                } catch {
 
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                                        // If the directory is not empty we return false. JGit relies on this
 
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                                        return false;
 
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                                }
 
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                        }
 
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                        return false;
 
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                }
 
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                public override bool Exists (FilePath path)
 
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                {
 
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                        var info = GetUnixFileInfo (path);
 
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                        return info != null && info.Exists;
 
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                }
 
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                public override bool IsDirectory (FilePath path)
 
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                {
 
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                        try {
 
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                                var info = GetUnixFileInfo (path);
 
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                                return info != null && info.Exists && info.FileType == FileTypes.Directory;
 
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                        } catch (DirectoryNotFoundException) {
 
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                                // If the file /foo/bar exists and we query to see if /foo/bar/baz exists, we get a
 
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                                // DirectoryNotFound exception for Mono.Unix. In this case the directory definitely
 
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                                // does not exist.
 
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                                return false;
 
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                        }
 
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                }
 
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                public override bool IsFile (FilePath path)
 
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                {
 
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                        var info = GetUnixFileInfo (path);
 
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                        return info != null && info.Exists && (info.FileType == FileTypes.RegularFile || info.FileType == FileTypes.SymbolicLink);
 
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                }
 
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                public override long LastModified (FilePath path)
 
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                {
 
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                        var info = GetUnixFileInfo (path);
 
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                        return info != null && info.Exists ? info.LastWriteTimeUtc.ToMillisecondsSinceEpoch() : 0;
 
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                }
 
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                public override long Length (FilePath path)
 
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                {
 
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                        var info = GetUnixFileInfo (path);
 
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                        return info != null && info.Exists ? info.Length : 0;
 
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                }
 
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                public override void MakeFileWritable (FilePath file)
 
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                {
 
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                        var info = GetUnixFileInfo (file);
 
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                        if (info != null)
 
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                                info.FileAccessPermissions |= (FileAccessPermissions.GroupWrite | FileAccessPermissions.OtherWrite | FileAccessPermissions.UserWrite);
 
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                }
 
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                public override bool RenameTo (FilePath path, string name)
 
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                {
 
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                        var symlink = GetUnixFileInfo (path) as UnixSymbolicLinkInfo;
 
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                        if (symlink != null) {
 
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                                var newFile = new UnixSymbolicLinkInfo (name);
 
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                                newFile.CreateSymbolicLinkTo (symlink.ContentsPath);
 
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                                return true;
 
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                        } else {
 
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                                // This call replaces the file if it already exists.
 
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                                // File.Move throws an exception if dest already exists
 
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                                return Mono.Unix.Native.Stdlib.rename (path, name) == 0;
 
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                        }
 
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                }
 
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                public override bool SetExecutable (FilePath path, bool exec)
 
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                {
 
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                        UnixFileInfo fi = new UnixFileInfo (path);
 
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                        FileAccessPermissions perms = fi.FileAccessPermissions;
 
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                        if (exec) {
 
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                                if (perms.HasFlag (FileAccessPermissions.UserRead))
 
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                                        perms |= FileAccessPermissions.UserExecute;
 
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                                if (perms.HasFlag (FileAccessPermissions.OtherRead))
 
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                                        perms |= FileAccessPermissions.OtherExecute;
 
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                                if ((perms.HasFlag (FileAccessPermissions.GroupRead)))
 
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                                        perms |= FileAccessPermissions.GroupExecute;
 
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                        } else {
 
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                                if (perms.HasFlag (FileAccessPermissions.UserRead))
 
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                                        perms &= ~FileAccessPermissions.UserExecute;
 
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                                if (perms.HasFlag (FileAccessPermissions.OtherRead))
 
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                                        perms &= ~FileAccessPermissions.OtherExecute;
 
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                                if ((perms.HasFlag (FileAccessPermissions.GroupRead)))
 
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                                        perms &= ~FileAccessPermissions.GroupExecute;
 
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                        }
 
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                        fi.FileAccessPermissions = perms;
 
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                        return true;
 
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                }
 
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                public override bool SetLastModified(FilePath path, long milis)
 
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                {
 
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                        // How can the last write time be set on a symlink?
 
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                        return base.SetLastModified(path, milis);
 
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                }
 
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                public override bool SetReadOnly (FilePath path)
 
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                {
 
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                        try {
 
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                                var info = GetUnixFileInfo (path);
 
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                                if (info != null)
 
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                                        info.FileAccessPermissions &= ~ (FileAccessPermissions.GroupWrite | FileAccessPermissions.OtherWrite | FileAccessPermissions.UserWrite);
 
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                                return true;
 
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                        } catch {
 
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                                return false;
 
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                        }
 
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                }
 
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        }
 
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}
 
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