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/* Copyright (C) 2013 Wildfire Games.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* look up directories/files by traversing path components.
*/
#include "precompiled.h"
#include "lib/file/vfs/vfs_lookup.h"
#include "lib/external_libraries/suppress_boost_warnings.h"
#include "lib/sysdep/filesystem.h"
#include "lib/file/file.h"
#include "lib/file/vfs/vfs.h" // error codes
#include "lib/file/vfs/vfs_tree.h"
#include "lib/file/vfs/vfs_populate.h"
#include "lib/timer.h"
static Status CreateDirectory(const OsPath& path)
{
{
const mode_t mode = S_IRWXU; // 0700 as prescribed by XDG basedir
const int ret = wmkdir(path, mode);
if(ret == 0) // success
return INFO::OK;
}
// failed because the directory already exists. this can happen
// when the first vfs_Lookup has addMissingDirectories &&
// !createMissingDirectories, and the directory is subsequently
// created. return 'success' to attach the existing directory..
if(errno == EEXIST)
{
// but first ensure it's really a directory (otherwise, a
// file is "in the way" and needs to be deleted)
struct stat s;
const int ret = wstat(path, &s);
ENSURE(ret == 0); // (wmkdir said it existed)
ENSURE(S_ISDIR(s.st_mode));
return INFO::OK;
}
if (errno == EACCES)
return ERR::FILE_ACCESS;
// unexpected failure
debug_printf("wmkdir failed with errno=%d\n", errno);
DEBUG_WARN_ERR(ERR::LOGIC);
WARN_RETURN(StatusFromErrno());
}
Status vfs_Lookup(const VfsPath& pathname, VfsDirectory* startDirectory, VfsDirectory*& directory, VfsFile** pfile, size_t flags)
{
// extract and validate flags (ensure no unknown bits are set)
const bool addMissingDirectories = (flags & VFS_LOOKUP_ADD) != 0;
const bool createMissingDirectories = (flags & VFS_LOOKUP_CREATE) != 0;
const bool skipPopulate = (flags & VFS_LOOKUP_SKIP_POPULATE) != 0;
const bool createAlways = (flags & VFS_LOOKUP_CREATE_ALWAYS) != 0;
ENSURE((flags & ~(VFS_LOOKUP_ADD|VFS_LOOKUP_CREATE|VFS_LOOKUP_SKIP_POPULATE|VFS_LOOKUP_CREATE_ALWAYS)) == 0);
directory = startDirectory;
if(pfile)
*pfile = 0;
if(!skipPopulate)
RETURN_STATUS_IF_ERR(vfs_Populate(directory));
// early-out for pathname == "" when mounting into VFS root
if(pathname.empty()) // (prevent iterator error in loop end condition)
{
if(pfile) // preserve a guarantee that if pfile then we either return an error or set *pfile
return ERR::VFS_FILE_NOT_FOUND;
else
return INFO::OK;
}
// for each directory component:
size_t pos = 0; // (needed outside of loop)
for(;;)
{
const size_t nextSlash = pathname.string().find_first_of('/', pos);
if(nextSlash == VfsPath::String::npos)
break;
const VfsPath subdirectoryName = pathname.string().substr(pos, nextSlash-pos);
pos = nextSlash+1;
VfsDirectory* subdirectory = directory->GetSubdirectory(subdirectoryName);
if(!subdirectory)
{
if(addMissingDirectories)
subdirectory = directory->AddSubdirectory(subdirectoryName);
else
return ERR::VFS_DIR_NOT_FOUND; // NOWARN
}
if(createMissingDirectories && (!subdirectory->AssociatedDirectory()
|| (createAlways && (subdirectory->AssociatedDirectory()->Flags() & VFS_MOUNT_REPLACEABLE) != 0)))
{
OsPath currentPath;
if(directory->AssociatedDirectory()) // (is NULL when mounting into root)
currentPath = directory->AssociatedDirectory()->Path();
currentPath = currentPath / subdirectoryName;
RETURN_STATUS_IF_ERR(CreateDirectory(currentPath));
PRealDirectory realDirectory(new RealDirectory(currentPath, 0, 0));
RETURN_STATUS_IF_ERR(vfs_Attach(subdirectory, realDirectory));
}
if(!skipPopulate)
RETURN_STATUS_IF_ERR(vfs_Populate(subdirectory));
directory = subdirectory;
}
if(pfile)
{
ENSURE(!pathname.IsDirectory());
const VfsPath filename = pathname.string().substr(pos);
*pfile = directory->GetFile(filename);
if(!*pfile)
return ERR::VFS_FILE_NOT_FOUND; // NOWARN
}
return INFO::OK;
}
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