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mingw.c
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mingw.c
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#include "../git-compat-util.h"
#include "win32.h"
#include <aclapi.h>
#include <sddl.h>
#include <conio.h>
#include <wchar.h>
#include "../strbuf.h"
#include "../run-command.h"
#include "../abspath.h"
#include "../alloc.h"
#include "win32/lazyload.h"
#include "../config.h"
#include "../environment.h"
#include "../trace2.h"
#include "../symlinks.h"
#include "../wrapper.h"
#include "dir.h"
#include "gettext.h"
#define SECURITY_WIN32
#include <sspi.h>
#define HCAST(type, handle) ((type)(intptr_t)handle)
static const int delay[] = { 0, 1, 10, 20, 40 };
void open_in_gdb(void)
{
static struct child_process cp = CHILD_PROCESS_INIT;
extern char *_pgmptr;
strvec_pushl(&cp.args, "mintty", "gdb", NULL);
strvec_pushf(&cp.args, "--pid=%d", getpid());
cp.clean_on_exit = 1;
if (start_command(&cp) < 0)
die_errno("Could not start gdb");
sleep(1);
}
int err_win_to_posix(DWORD winerr)
{
int error = ENOSYS;
switch(winerr) {
case ERROR_ACCESS_DENIED: error = EACCES; break;
case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
case ERROR_ALREADY_EXISTS: error = EEXIST; break;
case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
case ERROR_BAD_COMMAND: error = EIO; break;
case ERROR_BAD_DEVICE: error = ENODEV; break;
case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
case ERROR_BAD_FORMAT: error = ENOEXEC; break;
case ERROR_BAD_LENGTH: error = EINVAL; break;
case ERROR_BAD_PATHNAME: error = ENOENT; break;
case ERROR_BAD_PIPE: error = EPIPE; break;
case ERROR_BAD_UNIT: error = ENODEV; break;
case ERROR_BAD_USERNAME: error = EINVAL; break;
case ERROR_BROKEN_PIPE: error = EPIPE; break;
case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
case ERROR_BUSY: error = EBUSY; break;
case ERROR_BUSY_DRIVE: error = EBUSY; break;
case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
case ERROR_CANNOT_MAKE: error = EACCES; break;
case ERROR_CANTOPEN: error = EIO; break;
case ERROR_CANTREAD: error = EIO; break;
case ERROR_CANTWRITE: error = EIO; break;
case ERROR_CRC: error = EIO; break;
case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
case ERROR_DEVICE_IN_USE: error = EBUSY; break;
case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
case ERROR_DIRECTORY: error = EINVAL; break;
case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
case ERROR_DISK_CHANGE: error = EIO; break;
case ERROR_DISK_FULL: error = ENOSPC; break;
case ERROR_DRIVE_LOCKED: error = EBUSY; break;
case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
case ERROR_FILE_EXISTS: error = EEXIST; break;
case ERROR_FILE_INVALID: error = ENODEV; break;
case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
case ERROR_GEN_FAILURE: error = EIO; break;
case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
case ERROR_INVALID_ACCESS: error = EACCES; break;
case ERROR_INVALID_ADDRESS: error = EFAULT; break;
case ERROR_INVALID_BLOCK: error = EFAULT; break;
case ERROR_INVALID_DATA: error = EINVAL; break;
case ERROR_INVALID_DRIVE: error = ENODEV; break;
case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
case ERROR_INVALID_FLAGS: error = EINVAL; break;
case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
case ERROR_INVALID_HANDLE: error = EBADF; break;
case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
case ERROR_INVALID_NAME: error = EINVAL; break;
case ERROR_INVALID_OWNER: error = EINVAL; break;
case ERROR_INVALID_PARAMETER: error = EINVAL; break;
case ERROR_INVALID_PASSWORD: error = EPERM; break;
case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
case ERROR_INVALID_WORKSTATION: error = EACCES; break;
case ERROR_IO_DEVICE: error = EIO; break;
case ERROR_IO_INCOMPLETE: error = EINTR; break;
case ERROR_LOCKED: error = EBUSY; break;
case ERROR_LOCK_VIOLATION: error = EACCES; break;
case ERROR_LOGON_FAILURE: error = EACCES; break;
case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
case ERROR_MORE_DATA: error = EPIPE; break;
case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
case ERROR_NOACCESS: error = EFAULT; break;
case ERROR_NONE_MAPPED: error = EINVAL; break;
case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
case ERROR_NOT_READY: error = EAGAIN; break;
case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
case ERROR_NO_DATA: error = EPIPE; break;
case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
case ERROR_OPEN_FAILED: error = EIO; break;
case ERROR_OPEN_FILES: error = EBUSY; break;
case ERROR_OPERATION_ABORTED: error = EINTR; break;
case ERROR_OUTOFMEMORY: error = ENOMEM; break;
case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
case ERROR_PATH_BUSY: error = EBUSY; break;
case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
case ERROR_PIPE_BUSY: error = EBUSY; break;
case ERROR_PIPE_CONNECTED: error = EPIPE; break;
case ERROR_PIPE_LISTENING: error = EPIPE; break;
case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
case ERROR_READ_FAULT: error = EIO; break;
case ERROR_SEEK: error = EIO; break;
case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
case ERROR_SHARING_VIOLATION: error = EACCES; break;
case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
case ERROR_SUCCESS: BUG("err_win_to_posix() called without an error!");
case ERROR_SWAPERROR: error = ENOENT; break;
case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
case ERROR_WRITE_FAULT: error = EIO; break;
case ERROR_WRITE_PROTECT: error = EROFS; break;
}
return error;
}
static inline int is_file_in_use_error(DWORD errcode)
{
switch (errcode) {
case ERROR_SHARING_VIOLATION:
case ERROR_ACCESS_DENIED:
return 1;
}
return 0;
}
static int read_yes_no_answer(void)
{
char answer[1024];
if (fgets(answer, sizeof(answer), stdin)) {
size_t answer_len = strlen(answer);
int got_full_line = 0, c;
/* remove the newline */
if (answer_len >= 2 && answer[answer_len-2] == '\r') {
answer[answer_len-2] = '\0';
got_full_line = 1;
} else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
answer[answer_len-1] = '\0';
got_full_line = 1;
}
/* flush the buffer in case we did not get the full line */
if (!got_full_line)
while ((c = getchar()) != EOF && c != '\n')
;
} else
/* we could not read, return the
* default answer which is no */
return 0;
if (tolower(answer[0]) == 'y' && !answer[1])
return 1;
if (!strncasecmp(answer, "yes", sizeof(answer)))
return 1;
if (tolower(answer[0]) == 'n' && !answer[1])
return 0;
if (!strncasecmp(answer, "no", sizeof(answer)))
return 0;
/* did not find an answer we understand */
return -1;
}
static int ask_yes_no_if_possible(const char *format, ...)
{
char question[4096];
const char *retry_hook;
va_list args;
va_start(args, format);
vsnprintf(question, sizeof(question), format, args);
va_end(args);
retry_hook = mingw_getenv("GIT_ASK_YESNO");
if (retry_hook) {
struct child_process cmd = CHILD_PROCESS_INIT;
strvec_pushl(&cmd.args, retry_hook, question, NULL);
return !run_command(&cmd);
}
if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
return 0;
while (1) {
int answer;
fprintf(stderr, "%s (y/n) ", question);
if ((answer = read_yes_no_answer()) >= 0)
return answer;
fprintf(stderr, "Sorry, I did not understand your answer. "
"Please type 'y' or 'n'\n");
}
}
/* Windows only */
enum hide_dotfiles_type {
HIDE_DOTFILES_FALSE = 0,
HIDE_DOTFILES_TRUE,
HIDE_DOTFILES_DOTGITONLY
};
static int core_restrict_inherited_handles = -1;
static enum hide_dotfiles_type hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
static char *unset_environment_variables;
int mingw_core_config(const char *var, const char *value,
const struct config_context *ctx, void *cb)
{
if (!strcmp(var, "core.hidedotfiles")) {
if (value && !strcasecmp(value, "dotgitonly"))
hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
else
hide_dotfiles = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "core.unsetenvvars")) {
if (!value)
return config_error_nonbool(var);
free(unset_environment_variables);
unset_environment_variables = xstrdup(value);
return 0;
}
if (!strcmp(var, "core.restrictinheritedhandles")) {
if (value && !strcasecmp(value, "auto"))
core_restrict_inherited_handles = -1;
else
core_restrict_inherited_handles =
git_config_bool(var, value);
return 0;
}
return 0;
}
/* Normalizes NT paths as returned by some low-level APIs. */
static wchar_t *normalize_ntpath(wchar_t *wbuf)
{
int i;
/* fix absolute path prefixes */
if (wbuf[0] == '\\') {
/* strip NT namespace prefixes */
if (!wcsncmp(wbuf, L"\\??\\", 4) ||
!wcsncmp(wbuf, L"\\\\?\\", 4))
wbuf += 4;
else if (!wcsnicmp(wbuf, L"\\DosDevices\\", 12))
wbuf += 12;
/* replace remaining '...UNC\' with '\\' */
if (!wcsnicmp(wbuf, L"UNC\\", 4)) {
wbuf += 2;
*wbuf = '\\';
}
}
/* convert backslashes to slashes */
for (i = 0; wbuf[i]; i++)
if (wbuf[i] == '\\')
wbuf[i] = '/';
return wbuf;
}
int mingw_unlink(const char *pathname)
{
int ret, tries = 0;
wchar_t wpathname[MAX_PATH];
if (xutftowcs_path(wpathname, pathname) < 0)
return -1;
if (DeleteFileW(wpathname))
return 0;
/* read-only files cannot be removed */
_wchmod(wpathname, 0666);
while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
if (!is_file_in_use_error(GetLastError()))
break;
/*
* We assume that some other process had the source or
* destination file open at the wrong moment and retry.
* In order to give the other process a higher chance to
* complete its operation, we give up our time slice now.
* If we have to retry again, we do sleep a bit.
*/
Sleep(delay[tries]);
tries++;
}
while (ret == -1 && is_file_in_use_error(GetLastError()) &&
ask_yes_no_if_possible("Unlink of file '%s' failed. "
"Should I try again?", pathname))
ret = _wunlink(wpathname);
return ret;
}
static int is_dir_empty(const wchar_t *wpath)
{
WIN32_FIND_DATAW findbuf;
HANDLE handle;
wchar_t wbuf[MAX_PATH + 2];
wcscpy(wbuf, wpath);
wcscat(wbuf, L"\\*");
handle = FindFirstFileW(wbuf, &findbuf);
if (handle == INVALID_HANDLE_VALUE)
return GetLastError() == ERROR_NO_MORE_FILES;
while (!wcscmp(findbuf.cFileName, L".") ||
!wcscmp(findbuf.cFileName, L".."))
if (!FindNextFileW(handle, &findbuf)) {
DWORD err = GetLastError();
FindClose(handle);
return err == ERROR_NO_MORE_FILES;
}
FindClose(handle);
return 0;
}
int mingw_rmdir(const char *pathname)
{
int ret, tries = 0;
wchar_t wpathname[MAX_PATH];
struct stat st;
/*
* Contrary to Linux' `rmdir()`, Windows' _wrmdir() and _rmdir()
* (and `RemoveDirectoryW()`) will attempt to remove the target of a
* symbolic link (if it points to a directory).
*
* This behavior breaks the assumption of e.g. `remove_path()` which
* upon successful deletion of a file will attempt to remove its parent
* directories recursively until failure (which usually happens when
* the directory is not empty).
*
* Therefore, before calling `_wrmdir()`, we first check if the path is
* a symbolic link. If it is, we exit and return the same error as
* Linux' `rmdir()` would, i.e. `ENOTDIR`.
*/
if (!mingw_lstat(pathname, &st) && S_ISLNK(st.st_mode)) {
errno = ENOTDIR;
return -1;
}
if (xutftowcs_path(wpathname, pathname) < 0)
return -1;
while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
if (!is_file_in_use_error(GetLastError()))
errno = err_win_to_posix(GetLastError());
if (errno != EACCES)
break;
if (!is_dir_empty(wpathname)) {
errno = ENOTEMPTY;
break;
}
/*
* We assume that some other process had the source or
* destination file open at the wrong moment and retry.
* In order to give the other process a higher chance to
* complete its operation, we give up our time slice now.
* If we have to retry again, we do sleep a bit.
*/
Sleep(delay[tries]);
tries++;
}
while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
ask_yes_no_if_possible("Deletion of directory '%s' failed. "
"Should I try again?", pathname))
ret = _wrmdir(wpathname);
if (!ret)
invalidate_lstat_cache();
return ret;
}
static inline int needs_hiding(const char *path)
{
const char *basename;
if (hide_dotfiles == HIDE_DOTFILES_FALSE)
return 0;
/* We cannot use basename(), as it would remove trailing slashes */
win32_skip_dos_drive_prefix((char **)&path);
if (!*path)
return 0;
for (basename = path; *path; path++)
if (is_dir_sep(*path)) {
do {
path++;
} while (is_dir_sep(*path));
/* ignore trailing slashes */
if (*path)
basename = path;
else
break;
}
if (hide_dotfiles == HIDE_DOTFILES_TRUE)
return *basename == '.';
assert(hide_dotfiles == HIDE_DOTFILES_DOTGITONLY);
return !strncasecmp(".git", basename, 4) &&
(!basename[4] || is_dir_sep(basename[4]));
}
static int set_hidden_flag(const wchar_t *path, int set)
{
DWORD original = GetFileAttributesW(path), modified;
if (set)
modified = original | FILE_ATTRIBUTE_HIDDEN;
else
modified = original & ~FILE_ATTRIBUTE_HIDDEN;
if (original == modified || SetFileAttributesW(path, modified))
return 0;
errno = err_win_to_posix(GetLastError());
return -1;
}
int mingw_mkdir(const char *path, int mode)
{
int ret;
wchar_t wpath[MAX_PATH];
if (!is_valid_win32_path(path, 0)) {
errno = EINVAL;
return -1;
}
if (xutftowcs_path(wpath, path) < 0)
return -1;
ret = _wmkdir(wpath);
if (!ret && needs_hiding(path))
return set_hidden_flag(wpath, 1);
return ret;
}
/*
* Calling CreateFile() using FILE_APPEND_DATA and without FILE_WRITE_DATA
* is documented in [1] as opening a writable file handle in append mode.
* (It is believed that) this is atomic since it is maintained by the
* kernel unlike the O_APPEND flag which is racily maintained by the CRT.
*
* [1] https://docs.microsoft.com/en-us/windows/desktop/fileio/file-access-rights-constants
*
* This trick does not appear to work for named pipes. Instead it creates
* a named pipe client handle that cannot be written to. Callers should
* just use the regular _wopen() for them. (And since client handle gets
* bound to a unique server handle, it isn't really an issue.)
*/
static int mingw_open_append(wchar_t const *wfilename, int oflags, ...)
{
HANDLE handle;
int fd;
DWORD create = (oflags & O_CREAT) ? OPEN_ALWAYS : OPEN_EXISTING;
/* only these flags are supported */
if ((oflags & ~O_CREAT) != (O_WRONLY | O_APPEND))
return errno = ENOSYS, -1;
/*
* FILE_SHARE_WRITE is required to permit child processes
* to append to the file.
*/
handle = CreateFileW(wfilename, FILE_APPEND_DATA,
FILE_SHARE_WRITE | FILE_SHARE_READ,
NULL, create, FILE_ATTRIBUTE_NORMAL, NULL);
if (handle == INVALID_HANDLE_VALUE) {
DWORD err = GetLastError();
/*
* Some network storage solutions (e.g. Isilon) might return
* ERROR_INVALID_PARAMETER instead of expected error
* ERROR_PATH_NOT_FOUND, which results in an unknown error. If
* so, let's turn the error to ERROR_PATH_NOT_FOUND instead.
*/
if (err == ERROR_INVALID_PARAMETER)
err = ERROR_PATH_NOT_FOUND;
errno = err_win_to_posix(err);
return -1;
}
/*
* No O_APPEND here, because the CRT uses it only to reset the
* file pointer to EOF before each write(); but that is not
* necessary (and may lead to races) for a file created with
* FILE_APPEND_DATA.
*/
fd = _open_osfhandle((intptr_t)handle, O_BINARY);
if (fd < 0)
CloseHandle(handle);
return fd;
}
/*
* Does the pathname map to the local named pipe filesystem?
* That is, does it have a "//./pipe/" prefix?
*/
static int is_local_named_pipe_path(const char *filename)
{
return (is_dir_sep(filename[0]) &&
is_dir_sep(filename[1]) &&
filename[2] == '.' &&
is_dir_sep(filename[3]) &&
!strncasecmp(filename+4, "pipe", 4) &&
is_dir_sep(filename[8]) &&
filename[9]);
}
int mingw_open (const char *filename, int oflags, ...)
{
typedef int (*open_fn_t)(wchar_t const *wfilename, int oflags, ...);
va_list args;
unsigned mode;
int fd, create = (oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL);
wchar_t wfilename[MAX_PATH];
open_fn_t open_fn;
va_start(args, oflags);
mode = va_arg(args, int);
va_end(args);
if (!is_valid_win32_path(filename, !create)) {
errno = create ? EINVAL : ENOENT;
return -1;
}
if ((oflags & O_APPEND) && !is_local_named_pipe_path(filename))
open_fn = mingw_open_append;
else
open_fn = _wopen;
if (filename && !strcmp(filename, "/dev/null"))
wcscpy(wfilename, L"nul");
else if (xutftowcs_path(wfilename, filename) < 0)
return -1;
fd = open_fn(wfilename, oflags, mode);
if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
DWORD attrs = GetFileAttributesW(wfilename);
if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
errno = EISDIR;
}
if ((oflags & O_CREAT) && needs_hiding(filename)) {
/*
* Internally, _wopen() uses the CreateFile() API which errors
* out with an ERROR_ACCESS_DENIED if CREATE_ALWAYS was
* specified and an already existing file's attributes do not
* match *exactly*. As there is no mode or flag we can set that
* would correspond to FILE_ATTRIBUTE_HIDDEN, let's just try
* again *without* the O_CREAT flag (that corresponds to the
* CREATE_ALWAYS flag of CreateFile()).
*/
if (fd < 0 && errno == EACCES)
fd = open_fn(wfilename, oflags & ~O_CREAT, mode);
if (fd >= 0 && set_hidden_flag(wfilename, 1))
warning("could not mark '%s' as hidden.", filename);
}
return fd;
}
static BOOL WINAPI ctrl_ignore(DWORD type)
{
return TRUE;
}
#undef fgetc
int mingw_fgetc(FILE *stream)
{
int ch;
if (!isatty(_fileno(stream)))
return fgetc(stream);
SetConsoleCtrlHandler(ctrl_ignore, TRUE);
while (1) {
ch = fgetc(stream);
if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
break;
/* Ctrl+C was pressed, simulate SIGINT and retry */
mingw_raise(SIGINT);
}
SetConsoleCtrlHandler(ctrl_ignore, FALSE);
return ch;
}
#undef fopen
FILE *mingw_fopen (const char *filename, const char *otype)
{
int hide = needs_hiding(filename);
FILE *file;
wchar_t wfilename[MAX_PATH], wotype[4];
if (filename && !strcmp(filename, "/dev/null"))
wcscpy(wfilename, L"nul");
else if (!is_valid_win32_path(filename, 1)) {
int create = otype && strchr(otype, 'w');
errno = create ? EINVAL : ENOENT;
return NULL;
} else if (xutftowcs_path(wfilename, filename) < 0)
return NULL;
if (xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
return NULL;
if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
error("could not unhide %s", filename);
return NULL;
}
file = _wfopen(wfilename, wotype);
if (!file && GetLastError() == ERROR_INVALID_NAME)
errno = ENOENT;
if (file && hide && set_hidden_flag(wfilename, 1))
warning("could not mark '%s' as hidden.", filename);
return file;
}
FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
{
int hide = needs_hiding(filename);
FILE *file;
wchar_t wfilename[MAX_PATH], wotype[4];
if (filename && !strcmp(filename, "/dev/null"))
wcscpy(wfilename, L"nul");
else if (!is_valid_win32_path(filename, 1)) {
int create = otype && strchr(otype, 'w');
errno = create ? EINVAL : ENOENT;
return NULL;
} else if (xutftowcs_path(wfilename, filename) < 0)
return NULL;
if (xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
return NULL;
if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
error("could not unhide %s", filename);
return NULL;
}
file = _wfreopen(wfilename, wotype, stream);
if (file && hide && set_hidden_flag(wfilename, 1))
warning("could not mark '%s' as hidden.", filename);
return file;
}
#undef fflush
int mingw_fflush(FILE *stream)
{
int ret = fflush(stream);
/*
* write() is used behind the scenes of stdio output functions.
* Since git code does not check for errors after each stdio write
* operation, it can happen that write() is called by a later
* stdio function even if an earlier write() call failed. In the
* case of a pipe whose readable end was closed, only the first
* call to write() reports EPIPE on Windows. Subsequent write()
* calls report EINVAL. It is impossible to notice whether this
* fflush invocation triggered such a case, therefore, we have to
* catch all EINVAL errors whole-sale.
*/
if (ret && errno == EINVAL)
errno = EPIPE;
return ret;
}
#undef write
ssize_t mingw_write(int fd, const void *buf, size_t len)
{
ssize_t result = write(fd, buf, len);
if (result < 0 && (errno == EINVAL || errno == ENOSPC) && buf) {
int orig = errno;
/* check if fd is a pipe */
HANDLE h = (HANDLE) _get_osfhandle(fd);
if (GetFileType(h) != FILE_TYPE_PIPE)
errno = orig;
else if (orig == EINVAL)
errno = EPIPE;
else {
DWORD buf_size;
if (!GetNamedPipeInfo(h, NULL, NULL, &buf_size, NULL))
buf_size = 4096;
if (len > buf_size)
return write(fd, buf, buf_size);
errno = orig;
}
}
return result;
}
int mingw_access(const char *filename, int mode)
{
wchar_t wfilename[MAX_PATH];
if (!strcmp("nul", filename) || !strcmp("/dev/null", filename))
return 0;
if (xutftowcs_path(wfilename, filename) < 0)
return -1;
/* X_OK is not supported by the MSVCRT version */
return _waccess(wfilename, mode & ~X_OK);
}
int mingw_chdir(const char *dirname)
{
wchar_t wdirname[MAX_PATH];
if (xutftowcs_path(wdirname, dirname) < 0)
return -1;
return _wchdir(wdirname);
}
int mingw_chmod(const char *filename, int mode)
{
wchar_t wfilename[MAX_PATH];
if (xutftowcs_path(wfilename, filename) < 0)
return -1;
return _wchmod(wfilename, mode);
}
/*
* The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
* Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
*/
static inline long long filetime_to_hnsec(const FILETIME *ft)
{
long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
/* Windows to Unix Epoch conversion */
return winTime - 116444736000000000LL;
}
static inline void filetime_to_timespec(const FILETIME *ft, struct timespec *ts)
{
long long hnsec = filetime_to_hnsec(ft);
ts->tv_sec = (time_t)(hnsec / 10000000);
ts->tv_nsec = (hnsec % 10000000) * 100;
}
/**
* Verifies that safe_create_leading_directories() would succeed.
*/
static int has_valid_directory_prefix(wchar_t *wfilename)
{
int n = wcslen(wfilename);
while (n > 0) {
wchar_t c = wfilename[--n];
DWORD attributes;
if (!is_dir_sep(c))
continue;
wfilename[n] = L'\0';
attributes = GetFileAttributesW(wfilename);
wfilename[n] = c;
if (attributes &
(FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_DEVICE))
return 1;
if (attributes == INVALID_FILE_ATTRIBUTES)
switch (GetLastError()) {
case ERROR_PATH_NOT_FOUND:
continue;
case ERROR_FILE_NOT_FOUND:
/* This implies parent directory exists. */
return 1;
}
return 0;
}
return 1;
}
/* We keep the do_lstat code in a separate function to avoid recursion.
* When a path ends with a slash, the stat will fail with ENOENT. In
* this case, we strip the trailing slashes and stat again.
*
* If follow is true then act like stat() and report on the link
* target. Otherwise report on the link itself.
*/
static int do_lstat(int follow, const char *file_name, struct stat *buf)
{
WIN32_FILE_ATTRIBUTE_DATA fdata;
wchar_t wfilename[MAX_PATH];
if (xutftowcs_path(wfilename, file_name) < 0)
return -1;
if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
buf->st_ino = 0;
buf->st_gid = 0;
buf->st_uid = 0;
buf->st_nlink = 1;
buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
buf->st_size = fdata.nFileSizeLow |
(((off_t)fdata.nFileSizeHigh)<<32);
buf->st_dev = buf->st_rdev = 0; /* not used by Git */
filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
WIN32_FIND_DATAW findbuf;
HANDLE handle = FindFirstFileW(wfilename, &findbuf);
if (handle != INVALID_HANDLE_VALUE) {
if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
(findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
if (follow) {
char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
} else {
buf->st_mode = S_IFLNK;
}
buf->st_mode |= S_IREAD;
if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
buf->st_mode |= S_IWRITE;
}
FindClose(handle);
}
}
return 0;
}
switch (GetLastError()) {
case ERROR_ACCESS_DENIED:
case ERROR_SHARING_VIOLATION:
case ERROR_LOCK_VIOLATION:
case ERROR_SHARING_BUFFER_EXCEEDED:
errno = EACCES;
break;
case ERROR_BUFFER_OVERFLOW:
errno = ENAMETOOLONG;
break;
case ERROR_NOT_ENOUGH_MEMORY:
errno = ENOMEM;
break;
case ERROR_PATH_NOT_FOUND:
if (!has_valid_directory_prefix(wfilename)) {
errno = ENOTDIR;
break;
}
/* fallthru */
default:
errno = ENOENT;
break;
}
return -1;
}
/* We provide our own lstat/fstat functions, since the provided
* lstat/fstat functions are so slow. These stat functions are
* tailored for Git's usage (read: fast), and are not meant to be
* complete. Note that Git stat()s are redirected to mingw_lstat()
* too, since Windows doesn't really handle symlinks that well.
*/
static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
{
int namelen;
char alt_name[PATH_MAX];
if (!do_lstat(follow, file_name, buf))
return 0;
/* if file_name ended in a '/', Windows returned ENOENT;
* try again without trailing slashes
*/
if (errno != ENOENT)
return -1;
namelen = strlen(file_name);
if (namelen && file_name[namelen-1] != '/')
return -1;
while (namelen && file_name[namelen-1] == '/')
--namelen;
if (!namelen || namelen >= PATH_MAX)
return -1;
memcpy(alt_name, file_name, namelen);
alt_name[namelen] = 0;
return do_lstat(follow, alt_name, buf);
}
static int get_file_info_by_handle(HANDLE hnd, struct stat *buf)
{
BY_HANDLE_FILE_INFORMATION fdata;
if (!GetFileInformationByHandle(hnd, &fdata)) {
errno = err_win_to_posix(GetLastError());
return -1;
}
buf->st_ino = 0;
buf->st_gid = 0;
buf->st_uid = 0;
buf->st_nlink = 1;
buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
buf->st_size = fdata.nFileSizeLow |
(((off_t)fdata.nFileSizeHigh)<<32);
buf->st_dev = buf->st_rdev = 0; /* not used by Git */
filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
return 0;
}
int mingw_lstat(const char *file_name, struct stat *buf)
{
return do_stat_internal(0, file_name, buf);
}
int mingw_stat(const char *file_name, struct stat *buf)
{
return do_stat_internal(1, file_name, buf);
}
int mingw_fstat(int fd, struct stat *buf)
{
HANDLE fh = (HANDLE)_get_osfhandle(fd);
DWORD avail, type = GetFileType(fh) & ~FILE_TYPE_REMOTE;
switch (type) {
case FILE_TYPE_DISK:
return get_file_info_by_handle(fh, buf);
case FILE_TYPE_CHAR:
case FILE_TYPE_PIPE:
/* initialize stat fields */
memset(buf, 0, sizeof(*buf));
buf->st_nlink = 1;
if (type == FILE_TYPE_CHAR) {
buf->st_mode = _S_IFCHR;
} else {
buf->st_mode = _S_IFIFO;
if (PeekNamedPipe(fh, NULL, 0, NULL, &avail, NULL))
buf->st_size = avail;
}
return 0;
default:
errno = EBADF;
return -1;
}
}
static inline void time_t_to_filetime(time_t t, FILETIME *ft)
{
long long winTime = t * 10000000LL + 116444736000000000LL;
ft->dwLowDateTime = winTime;
ft->dwHighDateTime = winTime >> 32;
}
int mingw_utime (const char *file_name, const struct utimbuf *times)
{
FILETIME mft, aft;
int rc;
DWORD attrs;
wchar_t wfilename[MAX_PATH];
HANDLE osfilehandle;
if (xutftowcs_path(wfilename, file_name) < 0)
return -1;
/* must have write permission */
attrs = GetFileAttributesW(wfilename);
if (attrs != INVALID_FILE_ATTRIBUTES &&
(attrs & FILE_ATTRIBUTE_READONLY)) {