PATCH: chown escape for usernames containing .

[zefram@fysh.org]

Clint Adams wrote:
>> Almost.  chown accepts "." to separate username and group, in addition to
>> the POSIX ":".  This is the same level of POSIX conformance as GNU chown.
>
>Which is unlike any other chown on the planet.

Except for all the ones that just use ".", which GNU chown is trying to
be compatible with.

>                                                GNU chown would be a
>lot more tolerable if it supported some sort of override to allow
>usernames containing periods;

Yes, it did occur to me that this was a problem.

>                              such as '--ignore-group' or '::'
>ideas which have been suggested elsewhere.

Like this?

diff -cr ../zsh-/Doc/Zsh/mod_files.yo ./Doc/Zsh/mod_files.yo
*** ../zsh-/Doc/Zsh/mod_files.yo	Mon Dec 13 11:25:00 1999
--- ./Doc/Zsh/mod_files.yo	Mon Dec 13 11:16:53 1999
***************
*** 17,28 ****
  
  startsitem()
  sitem(var(user))(change owner to var(user); do not change group)
  sitem(var(user)tt(:))(change owner to var(user); change group to var(user)'s primary group)
  sitem(var(user)tt(:)var(group))(change owner to var(user); change group to var(group))
  sitem(tt(:)var(group))(do not change owner; change group to var(group))
  endsitem()
  
! In each case, the `tt(:)' may instead be a `tt(.)'.
  Each of var(user) and var(group) may be either a username (or group name, as
  appropriate) or a decimal user ID (group ID).  Interpretation as a name
  takes precedence, if there is an all-numeric username (or group name).
--- 17,33 ----
  
  startsitem()
  sitem(var(user))(change owner to var(user); do not change group)
+ sitem(var(user)tt(::))(change owner to var(user); do not change group)
  sitem(var(user)tt(:))(change owner to var(user); change group to var(user)'s primary group)
  sitem(var(user)tt(:)var(group))(change owner to var(user); change group to var(group))
  sitem(tt(:)var(group))(do not change owner; change group to var(group))
  endsitem()
  
! In each case, the `tt(:)' may instead be a `tt(.)'.  The rule is that
! if there is a `tt(:)' then the separator is `tt(:)', otherwise
! if there is a `tt(.)' then the separator is `tt(.)', otherwise
! there is no separator.
! 
  Each of var(user) and var(group) may be either a username (or group name, as
  appropriate) or a decimal user ID (group ID).  Interpretation as a name
  takes precedence, if there is an all-numeric username (or group name).
diff -cr ../zsh-/Src/Modules/files.c ./Src/Modules/files.c
*** ../zsh-/Src/Modules/files.c	Mon Dec 13 11:25:00 1999
--- ./Src/Modules/files.c	Mon Dec 13 11:24:02 1999
***************
*** 628,648 ****
  {
      struct chownmagic chm;
      char *uspec = ztrdup(*args), *p = uspec;
  
      chm.nam = nam;
      if(func == BIN_CHGRP) {
  	chm.uid = -1;
  	goto dogroup;
      }
!     if(*p == ':' || *p == '.') {
  	chm.uid = -1;
  	p++;
  	goto dogroup;
      } else {
  	struct passwd *pwd;
- 	char *end = strchr(p, ':');
- 	if(!end)
- 	    end = strchr(p, '.');
  	if(end)
  	    *end = 0;
  	pwd = getpwnam(p);
--- 628,649 ----
  {
      struct chownmagic chm;
      char *uspec = ztrdup(*args), *p = uspec;
+     char *end;
  
      chm.nam = nam;
      if(func == BIN_CHGRP) {
  	chm.uid = -1;
  	goto dogroup;
      }
!     end = strchr(uspec, ':');
!     if(!end)
! 	end = strchr(uspec, '.');
!     if(end == uspec) {
  	chm.uid = -1;
  	p++;
  	goto dogroup;
      } else {
  	struct passwd *pwd;
  	if(end)
  	    *end = 0;
  	pwd = getpwnam(p);
***************
*** 666,671 ****
--- 667,674 ----
  		    return 1;
  		}
  		chm.gid = pwd->pw_gid;
+ 	    } else if(p[0] == ':' && !p[1]) {
+ 		chm.gid = -1;
  	    } else {
  		struct group *grp;
  		dogroup:
END