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Copy pathmingw.c
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4493 lines (3969 loc) · 117 KB
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#define USE_THE_REPOSITORY_VARIABLE
#define DISABLE_SIGN_COMPARE_WARNINGS
#include "git-compat-util.h"
#include "abspath.h"
#include "alloc.h"
#include "attr.h"
#include "config.h"
#include "dir.h"
#include "environment.h"
#include "gettext.h"
#include "repository.h"
#include "run-command.h"
#include "strbuf.h"
#include "string-list.h"
#include "symlinks.h"
#include "trace2.h"
#include "win32.h"
#include "win32/exit-process.h"
#include "win32/fscache.h"
#include "win32/lazyload.h"
#include "win32/wsl.h"
#include "wrapper.h"
#include "write-or-die.h"
#include <aclapi.h>
#include <conio.h>
#include <sddl.h>
#define SECURITY_WIN32
#include <sspi.h>
#include <wchar.h>
#include <winioctl.h>
#include <winternl.h>
#define STATUS_DELETE_PENDING ((NTSTATUS) 0xC0000056)
#define HCAST(type, handle) ((type)(intptr_t)handle)
void open_in_gdb(void)
{
static struct child_process cp = CHILD_PROCESS_INIT;
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_REPARSE_DATA: 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_A_REPARSE_POINT: 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_REPARSE_ATTRIBUTE_CONFLICT: error = EINVAL; break;
case ERROR_REPARSE_TAG_INVALID: error = EINVAL; break;
case ERROR_REPARSE_TAG_MISMATCH: error = EINVAL; 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, va_list args)
{
char question[4096];
const char *retry_hook;
vsnprintf(question, sizeof(question), format, 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");
}
}
static int retry_ask_yes_no(int *tries, const char *format, ...)
{
static const int delay[] = { 0, 1, 10, 20, 40 };
va_list args;
int result, saved_errno = errno;
if ((*tries) < ARRAY_SIZE(delay)) {
/*
* We assume that some other process had the 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)++;
return 1;
}
va_start(args, format);
result = ask_yes_no_if_possible(format, args);
va_end(args);
errno = saved_errno;
return result;
}
/* Windows only */
enum hide_dotfiles_type {
HIDE_DOTFILES_FALSE = 0,
HIDE_DOTFILES_TRUE,
HIDE_DOTFILES_DOTGITONLY
};
static enum hide_dotfiles_type hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
static char *unset_environment_variables;
int core_fscache;
int are_long_paths_enabled(void)
{
/* default to `false` during initialization */
static const int fallback = 0;
static int enabled = -1;
if (enabled < 0) {
/* avoid infinite recursion */
if (!the_repository)
return fallback;
if (the_repository->config &&
the_repository->config->hash_initialized &&
repo_config_get_bool(the_repository, "core.longpaths", &enabled) < 0)
enabled = 0;
}
return enabled < 0 ? fallback : enabled;
}
int mingw_core_config(const char *var, const char *value,
const struct config_context *ctx UNUSED,
void *cb UNUSED)
{
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.fscache")) {
core_fscache = 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;
}
return 0;
}
static inline int is_wdir_sep(wchar_t wchar)
{
return wchar == L'/' || wchar == L'\\';
}
static const wchar_t *make_relative_to(const wchar_t *path,
const wchar_t *relative_to, wchar_t *out,
size_t size)
{
size_t i = wcslen(relative_to), len;
/* Is `path` already absolute? */
if (is_wdir_sep(path[0]) ||
(iswalpha(path[0]) && path[1] == L':' && is_wdir_sep(path[2])))
return path;
while (i > 0 && !is_wdir_sep(relative_to[i - 1]))
i--;
/* Is `relative_to` in the current directory? */
if (!i)
return path;
len = wcslen(path);
if (i + len + 1 > size) {
error("Could not make '%ls' relative to '%ls' (too large)",
path, relative_to);
return NULL;
}
memcpy(out, relative_to, i * sizeof(wchar_t));
wcscpy(out + i, path);
return out;
}
static DWORD symlink_file_flags = 0, symlink_directory_flags = 1;
enum phantom_symlink_result {
PHANTOM_SYMLINK_RETRY,
PHANTOM_SYMLINK_DONE,
PHANTOM_SYMLINK_DIRECTORY
};
/*
* Changes a file symlink to a directory symlink if the target exists and is a
* directory.
*/
static enum phantom_symlink_result
process_phantom_symlink(const wchar_t *wtarget, const wchar_t *wlink)
{
HANDLE hnd;
BY_HANDLE_FILE_INFORMATION fdata;
wchar_t relative[MAX_LONG_PATH];
const wchar_t *rel;
/*
* Do not follow symlinks to network shares, to avoid NTLM credential
* leak from crafted repositories (e.g. \\attacker-server\share).
* Since paths come in all kind of enterprising shapes and forms (in
* addition to the canonical `\\host\share` form, there's also
* `\??\UNC\host\share`, `\GLOBAL??\UNC\host\share` and also
* `\Device\Mup\host\share`, just to name a few), we simply avoid
* following every symlink target that starts with a slash.
*
* This also catches drive-less absolute paths, of course. These are
* uncommon in practice (and also fragile because they are relative to
* the current working directory's drive). The only "harm" this does
* is that it now requires users to specify via the Git attributes if
* they have such an uncommon symbolic link and need it to be a
* directory type link.
*/
if (is_wdir_sep(wtarget[0])) {
warning("created file symlink '%ls' pointing to '%ls';\n"
"set the `symlink` gitattribute to `dir` if a "
"directory symlink is required", wlink, wtarget);
return PHANTOM_SYMLINK_DONE;
}
/* check that wlink is still a file symlink */
if ((GetFileAttributesW(wlink)
& (FILE_ATTRIBUTE_REPARSE_POINT | FILE_ATTRIBUTE_DIRECTORY))
!= FILE_ATTRIBUTE_REPARSE_POINT)
return PHANTOM_SYMLINK_DONE;
/* make it relative, if necessary */
rel = make_relative_to(wtarget, wlink, relative, ARRAY_SIZE(relative));
if (!rel)
return PHANTOM_SYMLINK_DONE;
/* let Windows resolve the link by opening it */
hnd = CreateFileW(rel, 0,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL,
OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
if (hnd == INVALID_HANDLE_VALUE) {
errno = err_win_to_posix(GetLastError());
return PHANTOM_SYMLINK_RETRY;
}
if (!GetFileInformationByHandle(hnd, &fdata)) {
errno = err_win_to_posix(GetLastError());
CloseHandle(hnd);
return PHANTOM_SYMLINK_RETRY;
}
CloseHandle(hnd);
/* if target exists and is a file, we're done */
if (!(fdata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
return PHANTOM_SYMLINK_DONE;
/* otherwise recreate the symlink with directory flag */
if (DeleteFileW(wlink) &&
CreateSymbolicLinkW(wlink, wtarget, symlink_directory_flags))
return PHANTOM_SYMLINK_DIRECTORY;
errno = err_win_to_posix(GetLastError());
return PHANTOM_SYMLINK_RETRY;
}
/* keep track of newly created symlinks to non-existing targets */
struct phantom_symlink_info {
struct phantom_symlink_info *next;
wchar_t *wlink;
wchar_t *wtarget;
};
static struct phantom_symlink_info *phantom_symlinks = NULL;
static CRITICAL_SECTION phantom_symlinks_cs;
static void process_phantom_symlinks(void)
{
struct phantom_symlink_info *current, **psi;
EnterCriticalSection(&phantom_symlinks_cs);
/* process phantom symlinks list */
psi = &phantom_symlinks;
while ((current = *psi)) {
enum phantom_symlink_result result = process_phantom_symlink(
current->wtarget, current->wlink);
if (result == PHANTOM_SYMLINK_RETRY) {
psi = ¤t->next;
} else {
/* symlink was processed, remove from list */
*psi = current->next;
free(current);
/* if symlink was a directory, start over */
if (result == PHANTOM_SYMLINK_DIRECTORY)
psi = &phantom_symlinks;
}
}
LeaveCriticalSection(&phantom_symlinks_cs);
}
static int create_phantom_symlink(wchar_t *wtarget, wchar_t *wlink)
{
int len;
/* create file symlink */
if (!CreateSymbolicLinkW(wlink, wtarget, symlink_file_flags)) {
errno = err_win_to_posix(GetLastError());
return -1;
}
/* convert to directory symlink if target exists */
switch (process_phantom_symlink(wtarget, wlink)) {
case PHANTOM_SYMLINK_RETRY: {
/* if target doesn't exist, add to phantom symlinks list */
wchar_t wfullpath[MAX_LONG_PATH];
struct phantom_symlink_info *psi;
/* convert to absolute path to be independent of cwd */
len = GetFullPathNameW(wlink, MAX_LONG_PATH, wfullpath, NULL);
if (!len || len >= MAX_LONG_PATH) {
errno = err_win_to_posix(GetLastError());
return -1;
}
/* over-allocate and fill phantom_symlink_info structure */
psi = xmalloc(sizeof(struct phantom_symlink_info) +
sizeof(wchar_t) * (len + wcslen(wtarget) + 2));
psi->wlink = (wchar_t *)(psi + 1);
wcscpy(psi->wlink, wfullpath);
psi->wtarget = psi->wlink + len + 1;
wcscpy(psi->wtarget, wtarget);
EnterCriticalSection(&phantom_symlinks_cs);
psi->next = phantom_symlinks;
phantom_symlinks = psi;
LeaveCriticalSection(&phantom_symlinks_cs);
break;
}
case PHANTOM_SYMLINK_DIRECTORY:
/* if we created a dir symlink, process other phantom symlinks */
process_phantom_symlinks();
break;
default:
break;
}
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 handle_in_use_error)
{
int tries = 0;
wchar_t wpathname[MAX_LONG_PATH];
if (xutftowcs_long_path(wpathname, pathname) < 0)
return -1;
if (DeleteFileW(wpathname))
return 0;
do {
/* read-only files cannot be removed */
_wchmod(wpathname, 0666);
if (!_wunlink(wpathname))
return 0;
if (!is_file_in_use_error(GetLastError()))
break;
/*
* _wunlink() / DeleteFileW() for directory symlinks fails with
* ERROR_ACCESS_DENIED (EACCES), so try _wrmdir() as well. This is the
* same error we get if a file is in use (already checked above).
*/
if (!_wrmdir(wpathname))
return 0;
if (!handle_in_use_error)
return -1;
} while (retry_ask_yes_no(&tries, "Unlink of file '%s' failed. "
"Should I try again?", pathname));
return -1;
}
static int is_dir_empty(const wchar_t *wpath)
{
WIN32_FIND_DATAW findbuf;
HANDLE handle;
wchar_t wbuf[MAX_LONG_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 tries = 0;
wchar_t wpathname[MAX_LONG_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_long_path(wpathname, pathname) < 0)
return -1;
do {
if (!_wrmdir(wpathname)) {
invalidate_lstat_cache();
return 0;
}
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;
}
} while (retry_ask_yes_no(&tries, "Deletion of directory '%s' failed. "
"Should I try again?", pathname));
return -1;
}
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 UNUSED)
{
int ret;
wchar_t wpath[MAX_LONG_PATH];
if (!is_valid_win32_path(path, 0)) {
errno = EINVAL;
return -1;
}
/* CreateDirectoryW path limit is 248 (MAX_PATH - 8.3 file name) */
if (xutftowcs_path_ex(wpath, path, MAX_LONG_PATH, -1, 248,
are_long_paths_enabled()) < 0)
return -1;
ret = _wmkdir(wpath);
if (!ret)
process_phantom_symlinks();
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)) {
errno = ENOSYS;
return -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 | FILE_SHARE_DELETE,
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;
}
/*
* Ideally, we'd use `_wopen()` to implement this functionality so that we
* don't have to reimplement it, but unfortunately we do not have tight control
* over the share mode there. And while `_wsopen()` and friends exist that give
* us _some_ control over the share mode, this family of functions doesn't give
* us the ability to enable FILE_SHARE_DELETE, either. But this is a strict
* requirement for us though so that we can unlink or rename over files that
* are held open by another process.
*
* We are thus forced to implement our own emulation of `open()`. To make our
* life simpler we only implement basic support for this, namely opening
* existing files for reading and/or writing. This means that newly created
* files won't have their sharing mode set up correctly, but for now I couldn't
* find any case where this matters. We may have to revisit that in the future
* though based on our needs.
*/
static int mingw_open_existing(const wchar_t *filename, int oflags, ...)
{
SECURITY_ATTRIBUTES security_attributes = {
.nLength = sizeof(security_attributes),
.bInheritHandle = !(oflags & O_NOINHERIT),
};
HANDLE handle;
DWORD access;
int fd;
/* We only support basic flags. */
if (oflags & ~(O_ACCMODE | O_NOINHERIT)) {
errno = ENOSYS;
return -1;
}
switch (oflags & O_ACCMODE) {
case O_RDWR:
access = GENERIC_READ | GENERIC_WRITE;
break;
case O_WRONLY:
access = GENERIC_WRITE;
break;
default:
access = GENERIC_READ;
break;
}
handle = CreateFileW(filename, access,
FILE_SHARE_WRITE | FILE_SHARE_READ | FILE_SHARE_DELETE,
&security_attributes, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (handle == INVALID_HANDLE_VALUE) {
DWORD err = GetLastError();
if (err == ERROR_ACCESS_DENIED) {
DWORD attrs = GetFileAttributesW(filename);
if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
handle = CreateFileW(filename, access,
FILE_SHARE_WRITE | FILE_SHARE_READ | FILE_SHARE_DELETE,
&security_attributes, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL| FILE_FLAG_BACKUP_SEMANTICS, NULL);
}
if (handle == INVALID_HANDLE_VALUE) {
err = GetLastError();
/* See `mingw_open_append()` for why we have this conversion. */
if (err == ERROR_INVALID_PARAMETER)
err = ERROR_PATH_NOT_FOUND;
errno = err_win_to_posix(err);
return -1;
}
}
fd = _open_osfhandle((intptr_t)handle, oflags | 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, ...)
{
static int append_atomically = -1;
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_LONG_PATH];
open_fn_t open_fn;
WIN32_FILE_ATTRIBUTE_DATA fdata;
DECLARE_PROC_ADDR(ntdll.dll, NTSTATUS, NTAPI, RtlGetLastNtStatus, void);
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;
}
/*
* Only set append_atomically to default value(1) when repo is initialized
* and fail to get config value
*/
if (append_atomically < 0 && the_repository && the_repository->commondir &&
repo_config_get_bool(the_repository, "windows.appendatomically", &append_atomically))
append_atomically = 1;
if (append_atomically && (oflags & O_APPEND) &&
!is_local_named_pipe_path(filename))
open_fn = mingw_open_append;
else if (!(oflags & ~(O_ACCMODE | O_NOINHERIT)))
open_fn = mingw_open_existing;
else
open_fn = _wopen;
if (filename && !strcmp(filename, "/dev/null"))
wcscpy(wfilename, L"nul");
else if (xutftowcs_long_path(wfilename, filename) < 0)
return -1;
/*
* When `symlink` exists and is a symbolic link pointing to a
* non-existing file, `_wopen(symlink, O_CREAT | O_EXCL)` would
* create that file. Not what we want: Linux would say `EEXIST`
* in that instance, which is therefore what Git expects.
*/
if (create &&
GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata) &&
(fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT)) {
errno = EEXIST;
return -1;
}
fd = open_fn(wfilename, oflags, mode);
/*
* Internally, `_wopen()` uses the `CreateFile()` API with CREATE_NEW,
* which may error out with ERROR_ACCESS_DENIED and an NtStatus of
* STATUS_DELETE_PENDING when the file is scheduled for deletion via
* `DeleteFileW()`. The file essentially exists, so we map errno to
* EEXIST instead of EACCESS so that callers don't have to special-case
* this.
*
* This fixes issues for example with the lockfile interface when one
* process has a lock that it is about to commit or release while
* another process wants to acquire it.
*/
if (fd < 0 && create && GetLastError() == ERROR_ACCESS_DENIED &&
INIT_PROC_ADDR(RtlGetLastNtStatus) && RtlGetLastNtStatus() == STATUS_DELETE_PENDING)
errno = EEXIST;
else if ((oflags & O_CREAT) && fd >= 0 && are_wsl_compatible_mode_bits_enabled()) {
_mode_t wsl_mode = S_IFREG | (mode&0777);
set_wsl_mode_bits_by_handle((HANDLE)_get_osfhandle(fd), wsl_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 UNUSED)
{
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;
}