mirror of
https://git.proxmox.com/git/libgit2
synced 2025-05-08 04:30:48 +00:00
e6ed0d2f03
Introduce a simple counter that `p_fsync` implements. This is useful for ensuring that `p_fsync` is called when we expect it to be, for example when we have enabled an odb backend to perform `fsync`s when writing objects.
726 lines
16 KiB
C
726 lines
16 KiB
C
/*
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* Copyright (C) the libgit2 contributors. All rights reserved.
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*
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* This file is part of libgit2, distributed under the GNU GPL v2 with
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* a Linking Exception. For full terms see the included COPYING file.
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*/
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#include "../posix.h"
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#include "../fileops.h"
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#include "path.h"
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#include "path_w32.h"
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#include "utf-conv.h"
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#include "repository.h"
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#include "reparse.h"
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#include "global.h"
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#include "buffer.h"
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#include <errno.h>
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#include <io.h>
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#include <fcntl.h>
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#include <ws2tcpip.h>
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#ifndef FILE_NAME_NORMALIZED
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# define FILE_NAME_NORMALIZED 0
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#endif
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#ifndef IO_REPARSE_TAG_SYMLINK
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#define IO_REPARSE_TAG_SYMLINK (0xA000000CL)
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#endif
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/* Options which we always provide to _wopen.
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*
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* _O_BINARY - Raw access; no translation of CR or LF characters
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* _O_NOINHERIT - Do not mark the created handle as inheritable by child processes.
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* The Windows default is 'not inheritable', but the CRT's default (following
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* POSIX convention) is 'inheritable'. We have no desire for our handles to be
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* inheritable on Windows, so specify the flag to get default behavior back. */
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#define STANDARD_OPEN_FLAGS (_O_BINARY | _O_NOINHERIT)
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/* Allowable mode bits on Win32. Using mode bits that are not supported on
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* Win32 (eg S_IRWXU) is generally ignored, but Wine warns loudly about it
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* so we simply remove them.
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*/
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#define WIN32_MODE_MASK (_S_IREAD | _S_IWRITE)
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/* GetFinalPathNameByHandleW signature */
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typedef DWORD(WINAPI *PFGetFinalPathNameByHandleW)(HANDLE, LPWSTR, DWORD, DWORD);
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/**
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* Truncate or extend file.
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*
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* We now take a "git_off_t" rather than "long" because
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* files may be longer than 2Gb.
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*/
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int p_ftruncate(int fd, git_off_t size)
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{
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if (size < 0) {
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errno = EINVAL;
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return -1;
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}
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#if !defined(__MINGW32__) || defined(MINGW_HAS_SECURE_API)
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return ((_chsize_s(fd, size) == 0) ? 0 : -1);
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#else
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/* TODO MINGW32 Find a replacement for _chsize() that handles big files. */
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if (size > INT32_MAX) {
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errno = EFBIG;
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return -1;
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}
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return _chsize(fd, (long)size);
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#endif
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}
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int p_mkdir(const char *path, mode_t mode)
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{
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git_win32_path buf;
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GIT_UNUSED(mode);
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if (git_win32_path_from_utf8(buf, path) < 0)
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return -1;
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return _wmkdir(buf);
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}
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int p_link(const char *old, const char *new)
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{
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GIT_UNUSED(old);
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GIT_UNUSED(new);
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errno = ENOSYS;
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return -1;
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}
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int p_unlink(const char *path)
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{
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git_win32_path buf;
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int error;
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if (git_win32_path_from_utf8(buf, path) < 0)
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return -1;
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error = _wunlink(buf);
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/* If the file could not be deleted because it was
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* read-only, clear the bit and try again */
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if (error == -1 && errno == EACCES) {
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_wchmod(buf, 0666);
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error = _wunlink(buf);
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}
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return error;
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}
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int p_fsync(int fd)
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{
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HANDLE fh = (HANDLE)_get_osfhandle(fd);
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p_fsync__cnt++;
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if (fh == INVALID_HANDLE_VALUE) {
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errno = EBADF;
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return -1;
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}
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if (!FlushFileBuffers(fh)) {
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DWORD code = GetLastError();
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if (code == ERROR_INVALID_HANDLE)
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errno = EINVAL;
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else
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errno = EIO;
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return -1;
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}
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return 0;
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}
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#define WIN32_IS_WSEP(CH) ((CH) == L'/' || (CH) == L'\\')
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static int lstat_w(
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wchar_t *path,
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struct stat *buf,
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bool posix_enotdir)
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{
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WIN32_FILE_ATTRIBUTE_DATA fdata;
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if (GetFileAttributesExW(path, GetFileExInfoStandard, &fdata)) {
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if (!buf)
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return 0;
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return git_win32__file_attribute_to_stat(buf, &fdata, path);
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}
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switch (GetLastError()) {
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case ERROR_ACCESS_DENIED:
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errno = EACCES;
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break;
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default:
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errno = ENOENT;
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break;
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}
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/* To match POSIX behavior, set ENOTDIR when any of the folders in the
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* file path is a regular file, otherwise set ENOENT.
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*/
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if (errno == ENOENT && posix_enotdir) {
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size_t path_len = wcslen(path);
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/* scan up path until we find an existing item */
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while (1) {
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DWORD attrs;
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/* remove last directory component */
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for (path_len--; path_len > 0 && !WIN32_IS_WSEP(path[path_len]); path_len--);
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if (path_len <= 0)
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break;
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path[path_len] = L'\0';
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attrs = GetFileAttributesW(path);
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if (attrs != INVALID_FILE_ATTRIBUTES) {
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if (!(attrs & FILE_ATTRIBUTE_DIRECTORY))
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errno = ENOTDIR;
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break;
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}
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}
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}
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return -1;
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}
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static int do_lstat(const char *path, struct stat *buf, bool posixly_correct)
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{
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git_win32_path path_w;
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int len;
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if ((len = git_win32_path_from_utf8(path_w, path)) < 0)
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return -1;
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git_win32__path_trim_end(path_w, len);
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return lstat_w(path_w, buf, posixly_correct);
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}
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int p_lstat(const char *filename, struct stat *buf)
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{
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return do_lstat(filename, buf, false);
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}
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int p_lstat_posixly(const char *filename, struct stat *buf)
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{
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return do_lstat(filename, buf, true);
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}
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int p_utimes(const char *filename, const struct p_timeval times[2])
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{
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int fd, error;
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if ((fd = p_open(filename, O_RDWR)) < 0)
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return fd;
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error = p_futimes(fd, times);
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close(fd);
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return error;
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}
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int p_futimes(int fd, const struct p_timeval times[2])
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{
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HANDLE handle;
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FILETIME atime = {0}, mtime = {0};
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if (times == NULL) {
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SYSTEMTIME st;
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GetSystemTime(&st);
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SystemTimeToFileTime(&st, &atime);
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SystemTimeToFileTime(&st, &mtime);
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} else {
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git_win32__timeval_to_filetime(&atime, times[0]);
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git_win32__timeval_to_filetime(&mtime, times[1]);
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}
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if ((handle = (HANDLE)_get_osfhandle(fd)) == INVALID_HANDLE_VALUE)
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return -1;
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if (SetFileTime(handle, NULL, &atime, &mtime) == 0)
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return -1;
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return 0;
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}
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int p_readlink(const char *path, char *buf, size_t bufsiz)
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{
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git_win32_path path_w, target_w;
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git_win32_utf8_path target;
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int len;
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/* readlink(2) does not NULL-terminate the string written
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* to the target buffer. Furthermore, the target buffer need
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* not be large enough to hold the entire result. A truncated
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* result should be written in this case. Since this truncation
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* could occur in the middle of the encoding of a code point,
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* we need to buffer the result on the stack. */
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if (git_win32_path_from_utf8(path_w, path) < 0 ||
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git_win32_path_readlink_w(target_w, path_w) < 0 ||
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(len = git_win32_path_to_utf8(target, target_w)) < 0)
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return -1;
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bufsiz = min((size_t)len, bufsiz);
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memcpy(buf, target, bufsiz);
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return (int)bufsiz;
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}
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int p_symlink(const char *old, const char *new)
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{
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/* Real symlinks on NTFS require admin privileges. Until this changes,
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* libgit2 just creates a text file with the link target in the contents.
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*/
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return git_futils_fake_symlink(old, new);
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}
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int p_open(const char *path, int flags, ...)
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{
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git_win32_path buf;
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mode_t mode = 0;
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if (git_win32_path_from_utf8(buf, path) < 0)
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return -1;
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if (flags & O_CREAT) {
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va_list arg_list;
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va_start(arg_list, flags);
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mode = (mode_t)va_arg(arg_list, int);
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va_end(arg_list);
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}
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return _wopen(buf, flags | STANDARD_OPEN_FLAGS, mode & WIN32_MODE_MASK);
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}
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int p_creat(const char *path, mode_t mode)
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{
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git_win32_path buf;
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if (git_win32_path_from_utf8(buf, path) < 0)
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return -1;
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return _wopen(buf,
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_O_WRONLY | _O_CREAT | _O_TRUNC | STANDARD_OPEN_FLAGS,
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mode & WIN32_MODE_MASK);
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}
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int p_getcwd(char *buffer_out, size_t size)
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{
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git_win32_path buf;
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wchar_t *cwd = _wgetcwd(buf, GIT_WIN_PATH_UTF16);
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if (!cwd)
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return -1;
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/* Convert the working directory back to UTF-8 */
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if (git__utf16_to_8(buffer_out, size, cwd) < 0) {
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DWORD code = GetLastError();
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if (code == ERROR_INSUFFICIENT_BUFFER)
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errno = ERANGE;
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else
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errno = EINVAL;
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return -1;
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}
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return 0;
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}
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/*
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* Returns the address of the GetFinalPathNameByHandleW function.
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* This function is available on Windows Vista and higher.
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*/
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static PFGetFinalPathNameByHandleW get_fpnbyhandle(void)
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{
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static PFGetFinalPathNameByHandleW pFunc = NULL;
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PFGetFinalPathNameByHandleW toReturn = pFunc;
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if (!toReturn) {
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HMODULE hModule = GetModuleHandleW(L"kernel32");
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if (hModule)
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toReturn = (PFGetFinalPathNameByHandleW)GetProcAddress(hModule, "GetFinalPathNameByHandleW");
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pFunc = toReturn;
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}
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assert(toReturn);
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return toReturn;
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}
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static int getfinalpath_w(
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git_win32_path dest,
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const wchar_t *path)
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{
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PFGetFinalPathNameByHandleW pgfp = get_fpnbyhandle();
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HANDLE hFile;
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DWORD dwChars;
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if (!pgfp)
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return -1;
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/* Use FILE_FLAG_BACKUP_SEMANTICS so we can open a directory. Do not
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* specify FILE_FLAG_OPEN_REPARSE_POINT; we want to open a handle to the
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* target of the link. */
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hFile = CreateFileW(path, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_DELETE,
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NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
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if (INVALID_HANDLE_VALUE == hFile)
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return -1;
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/* Call GetFinalPathNameByHandle */
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dwChars = pgfp(hFile, dest, GIT_WIN_PATH_UTF16, FILE_NAME_NORMALIZED);
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CloseHandle(hFile);
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if (!dwChars || dwChars >= GIT_WIN_PATH_UTF16)
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return -1;
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/* The path may be delivered to us with a prefix; canonicalize */
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return (int)git_win32__canonicalize_path(dest, dwChars);
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}
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static int follow_and_lstat_link(git_win32_path path, struct stat* buf)
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{
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git_win32_path target_w;
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if (getfinalpath_w(target_w, path) < 0)
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return -1;
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return lstat_w(target_w, buf, false);
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}
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int p_fstat(int fd, struct stat *buf)
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{
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BY_HANDLE_FILE_INFORMATION fhInfo;
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HANDLE fh = (HANDLE)_get_osfhandle(fd);
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if (fh == INVALID_HANDLE_VALUE ||
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!GetFileInformationByHandle(fh, &fhInfo)) {
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errno = EBADF;
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return -1;
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}
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git_win32__file_information_to_stat(buf, &fhInfo);
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return 0;
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}
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int p_stat(const char* path, struct stat* buf)
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{
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git_win32_path path_w;
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int len;
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if ((len = git_win32_path_from_utf8(path_w, path)) < 0 ||
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lstat_w(path_w, buf, false) < 0)
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return -1;
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/* The item is a symbolic link or mount point. No need to iterate
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* to follow multiple links; use GetFinalPathNameFromHandle. */
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if (S_ISLNK(buf->st_mode))
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return follow_and_lstat_link(path_w, buf);
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return 0;
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}
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int p_chdir(const char* path)
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{
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git_win32_path buf;
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if (git_win32_path_from_utf8(buf, path) < 0)
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return -1;
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return _wchdir(buf);
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}
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int p_chmod(const char* path, mode_t mode)
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{
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git_win32_path buf;
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if (git_win32_path_from_utf8(buf, path) < 0)
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return -1;
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return _wchmod(buf, mode);
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}
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int p_rmdir(const char* path)
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{
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git_win32_path buf;
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int error;
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if (git_win32_path_from_utf8(buf, path) < 0)
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return -1;
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error = _wrmdir(buf);
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if (error == -1) {
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switch (GetLastError()) {
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/* _wrmdir() is documented to return EACCES if "A program has an open
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* handle to the directory." This sounds like what everybody else calls
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* EBUSY. Let's convert appropriate error codes.
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*/
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case ERROR_SHARING_VIOLATION:
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errno = EBUSY;
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break;
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/* This error can be returned when trying to rmdir an extant file. */
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case ERROR_DIRECTORY:
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errno = ENOTDIR;
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break;
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}
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}
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return error;
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}
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char *p_realpath(const char *orig_path, char *buffer)
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{
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git_win32_path orig_path_w, buffer_w;
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if (git_win32_path_from_utf8(orig_path_w, orig_path) < 0)
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return NULL;
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/* Note that if the path provided is a relative path, then the current directory
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* is used to resolve the path -- which is a concurrency issue because the current
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* directory is a process-wide variable. */
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if (!GetFullPathNameW(orig_path_w, GIT_WIN_PATH_UTF16, buffer_w, NULL)) {
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if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
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errno = ENAMETOOLONG;
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else
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errno = EINVAL;
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return NULL;
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}
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/* The path must exist. */
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if (GetFileAttributesW(buffer_w) == INVALID_FILE_ATTRIBUTES) {
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errno = ENOENT;
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return NULL;
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}
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if (!buffer && !(buffer = git__malloc(GIT_WIN_PATH_UTF8))) {
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errno = ENOMEM;
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return NULL;
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}
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/* Convert the path to UTF-8. If the caller provided a buffer, then it
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* is assumed to be GIT_WIN_PATH_UTF8 characters in size. If it isn't,
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* then we may overflow. */
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if (git_win32_path_to_utf8(buffer, buffer_w) < 0)
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return NULL;
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git_path_mkposix(buffer);
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return buffer;
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}
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int p_vsnprintf(char *buffer, size_t count, const char *format, va_list argptr)
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{
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#if defined(_MSC_VER)
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int len;
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if (count == 0)
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return _vscprintf(format, argptr);
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#if _MSC_VER >= 1500
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len = _vsnprintf_s(buffer, count, _TRUNCATE, format, argptr);
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#else
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len = _vsnprintf(buffer, count, format, argptr);
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#endif
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if (len < 0)
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return _vscprintf(format, argptr);
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return len;
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#else /* MinGW */
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return vsnprintf(buffer, count, format, argptr);
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#endif
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}
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int p_snprintf(char *buffer, size_t count, const char *format, ...)
|
|
{
|
|
va_list va;
|
|
int r;
|
|
|
|
va_start(va, format);
|
|
r = p_vsnprintf(buffer, count, format, va);
|
|
va_end(va);
|
|
|
|
return r;
|
|
}
|
|
|
|
/* TODO: wut? */
|
|
int p_mkstemp(char *tmp_path)
|
|
{
|
|
#if defined(_MSC_VER) && _MSC_VER >= 1500
|
|
if (_mktemp_s(tmp_path, strlen(tmp_path) + 1) != 0)
|
|
return -1;
|
|
#else
|
|
if (_mktemp(tmp_path) == NULL)
|
|
return -1;
|
|
#endif
|
|
|
|
return p_open(tmp_path, O_RDWR | O_CREAT | O_EXCL, 0744); //-V536
|
|
}
|
|
|
|
int p_access(const char* path, mode_t mode)
|
|
{
|
|
git_win32_path buf;
|
|
|
|
if (git_win32_path_from_utf8(buf, path) < 0)
|
|
return -1;
|
|
|
|
return _waccess(buf, mode & WIN32_MODE_MASK);
|
|
}
|
|
|
|
static int ensure_writable(wchar_t *fpath)
|
|
{
|
|
DWORD attrs;
|
|
|
|
attrs = GetFileAttributesW(fpath);
|
|
if (attrs == INVALID_FILE_ATTRIBUTES) {
|
|
if (GetLastError() == ERROR_FILE_NOT_FOUND)
|
|
return 0;
|
|
|
|
giterr_set(GITERR_OS, "failed to get attributes");
|
|
return -1;
|
|
}
|
|
|
|
if (!(attrs & FILE_ATTRIBUTE_READONLY))
|
|
return 0;
|
|
|
|
attrs &= ~FILE_ATTRIBUTE_READONLY;
|
|
if (!SetFileAttributesW(fpath, attrs)) {
|
|
giterr_set(GITERR_OS, "failed to set attributes");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int p_rename(const char *from, const char *to)
|
|
{
|
|
git_win32_path wfrom;
|
|
git_win32_path wto;
|
|
int rename_tries;
|
|
int rename_succeeded;
|
|
int error;
|
|
|
|
if (git_win32_path_from_utf8(wfrom, from) < 0 ||
|
|
git_win32_path_from_utf8(wto, to) < 0)
|
|
return -1;
|
|
|
|
/* wait up to 50ms if file is locked by another thread or process */
|
|
rename_tries = 0;
|
|
rename_succeeded = 0;
|
|
while (rename_tries < 10) {
|
|
if (ensure_writable(wto) == 0 &&
|
|
MoveFileExW(wfrom, wto, MOVEFILE_REPLACE_EXISTING | MOVEFILE_COPY_ALLOWED) != 0) {
|
|
rename_succeeded = 1;
|
|
break;
|
|
}
|
|
|
|
error = GetLastError();
|
|
if (error == ERROR_SHARING_VIOLATION || error == ERROR_ACCESS_DENIED) {
|
|
Sleep(5);
|
|
rename_tries++;
|
|
} else
|
|
break;
|
|
}
|
|
|
|
return rename_succeeded ? 0 : -1;
|
|
}
|
|
|
|
int p_recv(GIT_SOCKET socket, void *buffer, size_t length, int flags)
|
|
{
|
|
if ((size_t)((int)length) != length)
|
|
return -1; /* giterr_set will be done by caller */
|
|
|
|
return recv(socket, buffer, (int)length, flags);
|
|
}
|
|
|
|
int p_send(GIT_SOCKET socket, const void *buffer, size_t length, int flags)
|
|
{
|
|
if ((size_t)((int)length) != length)
|
|
return -1; /* giterr_set will be done by caller */
|
|
|
|
return send(socket, buffer, (int)length, flags);
|
|
}
|
|
|
|
/**
|
|
* Borrowed from http://old.nabble.com/Porting-localtime_r-and-gmtime_r-td15282276.html
|
|
* On Win32, `gmtime_r` doesn't exist but `gmtime` is threadsafe, so we can use that
|
|
*/
|
|
struct tm *
|
|
p_localtime_r (const time_t *timer, struct tm *result)
|
|
{
|
|
struct tm *local_result;
|
|
local_result = localtime (timer);
|
|
|
|
if (local_result == NULL || result == NULL)
|
|
return NULL;
|
|
|
|
memcpy (result, local_result, sizeof (struct tm));
|
|
return result;
|
|
}
|
|
struct tm *
|
|
p_gmtime_r (const time_t *timer, struct tm *result)
|
|
{
|
|
struct tm *local_result;
|
|
local_result = gmtime (timer);
|
|
|
|
if (local_result == NULL || result == NULL)
|
|
return NULL;
|
|
|
|
memcpy (result, local_result, sizeof (struct tm));
|
|
return result;
|
|
}
|
|
|
|
int p_inet_pton(int af, const char *src, void *dst)
|
|
{
|
|
struct sockaddr_storage sin;
|
|
void *addr;
|
|
int sin_len = sizeof(struct sockaddr_storage), addr_len;
|
|
int error = 0;
|
|
|
|
if (af == AF_INET) {
|
|
addr = &((struct sockaddr_in *)&sin)->sin_addr;
|
|
addr_len = sizeof(struct in_addr);
|
|
} else if (af == AF_INET6) {
|
|
addr = &((struct sockaddr_in6 *)&sin)->sin6_addr;
|
|
addr_len = sizeof(struct in6_addr);
|
|
} else {
|
|
errno = EAFNOSUPPORT;
|
|
return -1;
|
|
}
|
|
|
|
if ((error = WSAStringToAddressA((LPSTR)src, af, NULL, (LPSOCKADDR)&sin, &sin_len)) == 0) {
|
|
memcpy(dst, addr, addr_len);
|
|
return 1;
|
|
}
|
|
|
|
switch(WSAGetLastError()) {
|
|
case WSAEINVAL:
|
|
return 0;
|
|
case WSAEFAULT:
|
|
errno = ENOSPC;
|
|
return -1;
|
|
case WSA_NOT_ENOUGH_MEMORY:
|
|
errno = ENOMEM;
|
|
return -1;
|
|
}
|
|
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|