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/* Copyright (C) 2025 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 "vfs_lookup.h"
#include "lib/debug.h"
#include "lib/file/common/real_directory.h"
#include "lib/file/file.h"
#include "lib/file/file_system.h"
#include "lib/file/vfs/vfs.h" // error codes
#include "lib/file/vfs/vfs_populate.h"
#include "lib/file/vfs/vfs_tree.h"
#include "lib/os_path.h"
#include "lib/path.h"
#include "lib/posix/posix_filesystem.h"
#include "lib/sysdep/filesystem.h"
#include <cerrno>
#include <string>
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.
// 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 skipPopulate = (flags & VFS_LOOKUP_SKIP_POPULATE) != 0;
const bool realPath = (flags & VFS_LOOKUP_REAL_PATH) != 0;
ENSURE((flags & ~(VFS_LOOKUP_ADD|VFS_LOOKUP_SKIP_POPULATE|VFS_LOOKUP_REAL_PATH)) == 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)
{
// Preserve a guarantee that if pfile then we either return an error or set *pfile,
// and if looking for a real path ensure an associated directory.
if (pfile || (realPath && !directory->AssociatedDirectory()))
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
}
// When looking for a real path, we need to keep the path of the highest priority subdirectory.
// If the current directory has an associated directory, and the subdir does not / is lower priority,
// we will overwrite it.
PRealDirectory realDir = directory->AssociatedDirectory();
if (realPath && realDir &&
(!subdirectory->AssociatedDirectory() ||
realDir->Priority() > subdirectory->AssociatedDirectory()->Priority()))
{
OsPath currentPath = directory->AssociatedDirectory()->Path();
currentPath = currentPath / subdirectoryName / "";
// Only actually create the directory if we're in LOOKUP_ADD mode.
if (addMissingDirectories)
RETURN_STATUS_IF_ERR(CreateDirectory(currentPath));
else if (!DirectoryExists(currentPath))
return ERR::VFS_DIR_NOT_FOUND;
// Propagate priority and flags to the subdirectory.
// If it already existed, it will be replaced & the memory freed.
PRealDirectory realDirectory(new RealDirectory(currentPath,
realDir ? realDir->Priority() : 0,
realDir ? realDir->Flags() : 0)
);
RETURN_STATUS_IF_ERR(vfs_Attach(subdirectory, realDirectory));
}
if (!skipPopulate)
RETURN_STATUS_IF_ERR(vfs_Populate(subdirectory));
directory = subdirectory;
}
if (realPath && !directory->AssociatedDirectory())
return ERR::VFS_DIR_NOT_FOUND;
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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