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