Cygwin 3.5 mapping uid/gid on NFSv4 filesystem to unexpected IDs ...

[Roland Mainz <roland.mainz@nrubsig.org>]

Hi!

----

We've modified the NFSv4 drive for WIndows to support the Nfs3Attr API
uid/gid fields for Cygwin&SFU compatibility, and SID support (local
users mapped to their SIDs, and NFS users/groups without local
accounts are mapped to "S-1-22-1-*" (Unix_User+) and "S-1-22-2-*"
(Unix_Group+)) .

But on Cygwin 3.4.9 and Cygwin 3.5.0 something unexpected happens -
Cygwin /usr/bin/ls shows the wrong uid/uids:
For example the kernel driver fills in uid=197608/gid=197121 (matching
what $ getent passwd/group # says), but ls(1) prints
uid=4278387688/gid=4278387201
It seems Cygwin is mapping ALL NFS3Attr uid/gid values to the
Unix_User+/Unix_Group+ range. On Solaris&Linux the NFS uid/gid values
are correct, and the Windows NFSv4 driver uses the same numeric
values.

Example:
---- snip ----
$ uname -a
CYGWIN_NT-10.0-19045 wingrendel02 3.5.0-0.448.gd56d58ace27b.x86_64
2023-10-30 11:42 UTC x86_64 Cygwin

$ cmd /c 'dir /q'
 Datenträger in Laufwerk T: ist PnfsVolume
 Volumeseriennummer: DEAD-BEEF

 Verzeichnis von T:\test1

31.10.2023  11:53    <DIR>          WINGRENDEL02\roland_mai.
27.10.2023  16:36    <DIR>          ...                    ..
31.10.2023  11:54    <DIR>          WINGRENDEL02\roland_maiksh
30.10.2023  13:05         1.411.059 WINGRENDEL02\roland_maixxx
30.10.2023  12:46    <DIR>          WINGRENDEL02\roland_maijunctiontest1
31.10.2023  05:16    <DIR>          WINGRENDEL02\roland_maibash
               1 Datei(en),      1.415.039 Bytes
               5 Verzeichnis(se),  1.686.773.760 Bytes frei

$ id -a
uid=197608(roland_mainz) gid=197121(Kein)
groups=197121(Kein),545(Benutzer),559(Leistungsprotokollbenutzer),4(INTERAKTIV),66049(KONSOLENANMELDUNG),11(Authentifizierte
Benutzer),15(Diese Organisation),113(Lokales
Konto),4095(CurrentSession),66048(LOKAL),262154(NTLM-Authentifizierung),401408(Mittlere
Verbindlichkeitsstufe)

$ ls -la
total 1386
drwxr-xr-x  5 Unix_User+197608 Unix_Group+197121     120 Oct 31 11:53 .
drwxrwxrwt  3 Unix_User+0      Unix_Group+0           60 Oct 27 17:36 ..
drwxr-xr-x 14 Unix_User+197608 Unix_Group+197121    3660 Oct 31 05:16 bash
drwxr-xr-x  2 Unix_User+197608 Unix_Group+197121      60 Oct 30 12:46
junctiontest1
drwxr-xr-x  3 Unix_User+197608 Unix_Group+197121      80 Oct 31 11:54 ksh
-rwxr-xr-x  1 Unix_User+197608 Unix_Group+197121 1411059 Oct 30 13:05 xxx

$ ls -lan
total 1386
drwxr-xr-x  5 4278387688 4278387201     120 Oct 31 11:53 .
drwxrwxrwt  3 4278190080 4278190080      60 Oct 27 17:36 ..
drwxr-xr-x 14 4278387688 4278387201    3660 Oct 31 05:16 bash
drwxr-xr-x  2 4278387688 4278387201      60 Oct 30 12:46 junctiontest1
drwxr-xr-x  3 4278387688 4278387201      80 Oct 31 11:54 ksh
-rwxr-xr-x  1 4278387688 4278387201 1411059 Oct 30 13:05 xxx
---- snip ----

Is the Cygwin behaviour (i.e. mapping of NFS3Attr uid/gid to different
uid/gid in Cygwin $ ls -n #) intended ?

----

Bye,
Roland
-- 
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