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

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Implement `symlink()`. This implementation always creates _file_
symlinks (remember: Windows discerns between symlinks pointing to
directories and those pointing to files). Support for directory symlinks
will be added in a subseqeuent commit.

This implementation fails with `ENOSYS` if symlinks are disabled or
unsupported.

Signed-off-by: Karsten Blees <karsten.blees@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Karsten Blees 2026-01-09 20:05:11 +00:00 committed by Junio C Hamano
parent 980852dbff
commit 593008b95d
2 changed files with 29 additions and 2 deletions
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3
compat/mingw-posix.h
View File

@ -121,8 +121,6 @@ struct utsname {
* trivial stubs
*/
static inline int symlink(const char *oldpath UNUSED, const char *newpath UNUSED)
{ errno = ENOSYS; return -1; }
static inline int fchmod(int fildes UNUSED, mode_t mode UNUSED)
{ errno = ENOSYS; return -1; }
#ifndef __MINGW64_VERSION_MAJOR
@ -195,6 +193,7 @@ 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);
/*

28
compat/mingw.c
View File

@ -2698,6 +2698,34 @@ int link(const char *oldpath, const char *newpath)
return 0;
}
int symlink(const char *target, const char *link)
{
wchar_t wtarget[MAX_PATH], wlink[MAX_PATH];
int len;
/* fail if symlinks are disabled or API is not supported (WinXP) */
if (!has_symlinks) {
errno = ENOSYS;
return -1;
}
if ((len = xutftowcs_path(wtarget, target)) < 0
|| xutftowcs_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;
}
int readlink(const char *path, char *buf, size_t bufsiz)
{
WCHAR wpath[MAX_PATH];