Re: Odd, is it not? mkdir 'e:\' cannot be undone by rmdir 'e:\' ...

[Corinna Vinschen <corinna-cygwin at cygwin dot com>]

Eric?


On Aug 29 17:05, Houder wrote:
> On Wed, 28 Aug 2019 16:22:20, Corinna Vinschen  wrote:
> 
> > > As simple as that?
> > >
> > > diff --git a/winsup/cygwin/dir.cc b/winsup/cygwin/dir.cc
> > > index b757851d5c7f..747b1582af50 100644
> > > --- a/winsup/cygwin/dir.cc
> > > +++ b/winsup/cygwin/dir.cc
> > > @@ -314,13 +314,13 @@ mkdir (const char *dir, mode_t mode)
> > >  	  set_errno (ENOENT);
> > >  	  __leave;
> > >  	}
> > > -      if (isdirsep (dir[strlen (dir) - 1]))
> > > +      if (dir[strlen (dir) - 1] =3D=3D '/')
> > >  	{
> > >  	  /* This converts // to /, but since both give EEXIST, we're okay.  */
> > >  	  char *buf;
> > >  	  char *p =3D stpcpy (buf =3D tp.c_get (), dir) - 1;
> > >  	  dir =3D buf;
> > > -	  while (p > dir && isdirsep (*p))
> > > +	  while (p > dir && *p =3D=3D '/')
> > >  	    *p-- =3D '\0';
> > >  	}
> > >        if (!(fh =3D build_fh_name (dir, PC_SYM_NOFOLLOW)))
> > 
> > One problem here is, what to do about border cases like
> > 
> >   $ mkdir a\/\/\/
> > 
> > In theory slashes and backslashes should both be treated as dir
> > separators.  Handling a case like this so that all expectations
> > are satisfied is next to impossible, I guess.
> 
> How about dropping Eric's code snippet in winsup/cygwin/dir.cc ?????
> 
> Subdirectory 'a' is created. No problem there. Perhaps the patch has
> become superfluous/ redundant over time?
> 
> I have tried different "values" for the path-argument to mkdir, and
> have not found a problem while the code snippet is being skipped.
> 
> What am I missing?
> 
> Henri
> 
> -----
> Breakpoint 1 at 0x1800548b9: file /usr/src/debug/cygwin-3.1.0-0.2/winsup/cygwin/dir.cc, line 317.
> Breakpoint 2 at 0x1800548e3: file /usr/src/debug/cygwin-3.1.0-0.2/winsup/cygwin/dir.cc, line 326.
> (gdb) r
> Starting program: /usr/bin/mkdir 'a\/\/\/'
> [New Thread 1064.0x1a8c]
> [New Thread 1064.0x59c]
> 
> Thread 1 "mkdir" hit Breakpoint 1, mkdir (dir=0x800041320 "a\\/\\/\\/", mode=511)
>     at /usr/src/debug/cygwin-3.1.0-0.2/winsup/cygwin/dir.cc:317
> 317           if (isdirsep (dir[strlen (dir) - 1]))
> (gdb) j dir.cc:326
> Continuing at 0x1800548e3.
> 
> Thread 1 "mkdir" hit Breakpoint 2, mkdir (dir=0x800041320 "a\\/\\/\\/", mode=511)
>     at /usr/src/debug/cygwin-3.1.0-0.2/winsup/cygwin/dir.cc:326
> 326           if (!(fh = build_fh_name (dir, PC_SYM_NOFOLLOW)))
> (gdb) c
> Continuing.
> [Inferior 1 (process 1064) exited normally]
> (gdb) quit
> 
> 64-@@ ls -ld a*
> drwxr-xr-x+ 1 Henri None 0 Aug 29 16:47 a
> 
> =====
> 
> 
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-- 
Corinna Vinschen
Cygwin Maintainer

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