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Commitdb4d22d

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Add pgreadlink() on Windows to read junction points
Add support for reading back information about the symboliclinks we've created with pgsymlink(), which are actuallyJunction Points. Just like pgsymlink() can only create directorysymlinks, pgreadlink() can only read directory symlinks.
1 parent1066dbf commitdb4d22d

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2 files changed

+121
-0
lines changed

2 files changed

+121
-0
lines changed

‎src/include/port.h

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -284,8 +284,11 @@ extern intpgunlink(const char *path);
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*/
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#if defined(WIN32)&& !defined(__CYGWIN__)
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externintpgsymlink(constchar*oldpath,constchar*newpath);
287+
externintpgreadlink(constchar*path,char*buf,size_tsize);
288+
externboolpgwin32_is_junction(char*path);
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#definesymlink(oldpath,newpath)pgsymlink(oldpath, newpath)
291+
#definereadlink(path,buf,size)pgreadlink(path, buf, size)
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#endif
290293

291294
externboolrmtree(constchar*path,boolrmtopdir);

‎src/port/dirmod.c

Lines changed: 118 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -297,6 +297,124 @@ pgsymlink(const char *oldpath, const char *newpath)
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return0;
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}
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/*
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*pgreadlink - uses Win32 junction points
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*/
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int
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pgreadlink(constchar*path,char*buf,size_tsize)
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{
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DWORDattr;
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HANDLEh;
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charbuffer[MAX_PATH*sizeof(WCHAR)+sizeof(REPARSE_JUNCTION_DATA_BUFFER)];
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REPARSE_JUNCTION_DATA_BUFFER*reparseBuf= (REPARSE_JUNCTION_DATA_BUFFER*)buffer;
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DWORDlen;
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intr;
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attr=GetFileAttributes(path);
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if (attr==INVALID_FILE_ATTRIBUTES)
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{
317+
_dosmaperr(GetLastError());
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return-1;
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}
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if ((attr&FILE_ATTRIBUTE_REPARSE_POINT)==0)
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{
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errno=EINVAL;
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return-1;
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}
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h=CreateFile(path,
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GENERIC_READ,
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FILE_SHARE_READ |FILE_SHARE_WRITE,
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NULL,
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OPEN_EXISTING,
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FILE_FLAG_OPEN_REPARSE_POINT |FILE_FLAG_BACKUP_SEMANTICS,
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0);
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if (h==INVALID_HANDLE_VALUE)
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{
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_dosmaperr(GetLastError());
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return-1;
337+
}
338+
339+
if (!DeviceIoControl(h,
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FSCTL_GET_REPARSE_POINT,
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NULL,
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0,
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(LPVOID)reparseBuf,
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sizeof(buffer),
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&len,
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NULL))
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{
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LPSTRmsg;
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errno=0;
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FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |FORMAT_MESSAGE_FROM_SYSTEM,
352+
NULL,GetLastError(),
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MAKELANGID(LANG_ENGLISH,SUBLANG_DEFAULT),
354+
(LPSTR)&msg,0,NULL);
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#ifndefFRONTEND
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ereport(ERROR,
357+
(errcode_for_file_access(),
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errmsg("could not get junction for \"%s\": %s",
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path,msg)));
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#else
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fprintf(stderr,_("could not get junction for \"%s\": %s\n"),
362+
path,msg);
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#endif
364+
LocalFree(msg);
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CloseHandle(h);
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errno=EINVAL;
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return-1;
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}
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CloseHandle(h);
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/* Got it, let's get some results from this */
372+
if (reparseBuf->ReparseTag!=IO_REPARSE_TAG_MOUNT_POINT)
373+
{
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errno=EINVAL;
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return-1;
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}
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r=WideCharToMultiByte(CP_ACP,0,
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reparseBuf->PathBuffer,-1,
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buf,
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size,
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NULL,NULL);
383+
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if (r <=0)
385+
{
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errno=EINVAL;
387+
return-1;
388+
}
389+
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/*
391+
* If the path starts with "\??\", which it will do in most (all?) cases,
392+
* strip those out.
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*/
394+
if (r>4&&strncmp(buf,"\\??\\",4)==0)
395+
{
396+
memmove(buf,buf+4,strlen(buf+4)+1);
397+
r-=4;
398+
}
399+
returnr;
400+
}
401+
402+
/*
403+
* Assumes the file exists, so will return false if it doesn't
404+
* (since a nonexistant file is not a junction)
405+
*/
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bool
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pgwin32_is_junction(char*path)
408+
{
409+
DWORDattr=GetFileAttributes(path);
410+
411+
if (attr==INVALID_FILE_ATTRIBUTES)
412+
{
413+
_dosmaperr(GetLastError());
414+
return false;
415+
}
416+
return ((attr&FILE_ATTRIBUTE_REPARSE_POINT)==FILE_ATTRIBUTE_REPARSE_POINT);
417+
}
300418
#endif/* defined(WIN32) && !defined(__CYGWIN__) */
301419

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