global/git
1
0
Fork 0
mirror of https://github.com/git/git.git synced 2026-01-19 15:09:01 +00:00
Code Issues Packages Projects Releases Wiki Activity

Win32: implement basic symlink() functionality (file symlinks only)

Browse Source 
Implement symlink() that always creates file symlinks. Fails with ENOSYS
if symlinks are disabled or unsupported.

Note: CreateSymbolicLinkW() was introduced with symlink support in Windows
Vista. For compatibility with Windows XP, we need to load it dynamically
and fail gracefully if it isnt's available.

Signed-off-by: Karsten Blees <blees@dcon.de>
This commit is contained in:
Karsten Blees
2015-05-24 01:32:03 +02:00
committed by Jameson Miller
parent 82a90c569c
commit 1f1cffa5ab
2 changed files with 31 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
compat/mingw.c
View File

@@ -270,6 +270,8 @@ int mingw_core_config(const char *var, const char *value, void *cb)
return 0;
}
DECLARE_PROC_ADDR(kernel32.dll, BOOLEAN, CreateSymbolicLinkW, LPCWSTR, LPCWSTR, DWORD);
/* Normalizes NT paths as returned by some low-level APIs. */
static wchar_t *normalize_ntpath(wchar_t *wbuf)
{
@@ -2172,6 +2174,34 @@ int link(const char *oldpath, const char *newpath)
return 0;
}
int symlink(const char *target, const char *link)
{
wchar_t wtarget[MAX_LONG_PATH], wlink[MAX_LONG_PATH];
int len;
/* fail if symlinks are disabled or API is not supported (WinXP) */
if (!has_symlinks || !INIT_PROC_ADDR(CreateSymbolicLinkW)) {
errno = ENOSYS;
return -1;
}
if ((len = xutftowcs_long_path(wtarget, target)) < 0
|| xutftowcs_long_path(wlink, link) < 0)
return -1;
/* convert target dir separators to backslashes */
while (len--)
if (wtarget[len] == '/')
wtarget[len] = '\\';
/* create file symlink */
if (!CreateSymbolicLinkW(wlink, wtarget, 0)) {
errno = err_win_to_posix(GetLastError());
return -1;
}
return 0;
}
#ifndef _WINNT_H
/*
* The REPARSE_DATA_BUFFER structure is defined in the Windows DDK (in

3
compat/mingw.h
View File

@@ -123,8 +123,6 @@ struct utsname {
* trivial stubs
*/
static inline int symlink(const char *oldpath, const char *newpath)
{ errno = ENOSYS; return -1; }
static inline int fchmod(int fildes, mode_t mode)
{ errno = ENOSYS; return -1; }
#ifndef __MINGW64_VERSION_MAJOR
@@ -216,6 +214,7 @@ int setitimer(int type, struct itimerval *in, struct itimerval *out);
int sigaction(int sig, struct sigaction *in, struct sigaction *out);
int link(const char *oldpath, const char *newpath);
int uname(struct utsname *buf);
int symlink(const char *target, const char *link);
int readlink(const char *path, char *buf, size_t bufsiz);
/*