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Re: [4/5] Add option for hardlinkable cache of extracted blobs

From
PJPaul Jackson <pj@sgi.com>
Date
Apr 17, 2005, 19:25 UTC
Message-ID
<20050417122517.4b12faea.pj@sgi.com>
In-Reply-To
<20050417174736.GA1461@pasky.ji.cz>
Petr wrote:
> BTW, I'd just use access(F_OK) instead of stat() it I don't care about
That's a bad habit to get into.

access(2) checks with the process's real uid and gid, rather than with the effective ids as is done when actually attempting an operation. This is to allow set-UID programs to easily determine the invoking user's authority.

Using access(2) when it shouldn't be used is a common source of bugs.

I recommend _only_ using it when you require exactly the above real vs. effective id behaviour.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@engr.sgi.com> 1.650.933.1373, 1.925.600.0401
Previous: Daniel BarkalowNext: Daniel Barkalow
Message 36 of 37 in “[0/5] Patch set for various things”
  1. Daniel BarkalowApr 17, 2005
  2. 1/5 Parsing code in revision.hDaniel Barkalow, Apr 17, 2005
  3. Petr BaudisApr 17, 2005
  4. Daniel BarkalowApr 17, 2005
  5. Linus TorvaldsApr 17, 2005
  6. Petr BaudisApr 17, 2005
  7. Linus TorvaldsApr 17, 2005
  8. Daniel BarkalowApr 17, 2005
  9. Linus TorvaldsApr 17, 2005
  10. Daniel BarkalowApr 17, 2005
  11. 2/5 Add merge-baseDaniel Barkalow, Apr 17, 2005
  12. Petr BaudisApr 17, 2005
  13. Daniel BarkalowApr 17, 2005
  14. 1/5 Add merge-baseDaniel Barkalow, Apr 17, 2005
  15. Petr BaudisApr 17, 2005
  16. Daniel BarkalowApr 17, 2005
  17. 3/5 Add http-pullDaniel Barkalow, Apr 17, 2005
  18. Petr BaudisApr 17, 2005
  19. Daniel BarkalowApr 17, 2005
  20. Petr BaudisApr 17, 2005
  21. Daniel BarkalowApr 17, 2005
  22. Petr BaudisApr 17, 2005
  23. Brad RobertsApr 21, 2005
  24. Daniel BarkalowApr 21, 2005
  25. tony.luck@intel.comApr 21, 2005
  26. Daniel BarkalowApr 22, 2005
  27. Petr BaudisApr 22, 2005
  28. Daniel BarkalowApr 22, 2005
  29. Petr BaudisApr 22, 2005
  30. Daniel BarkalowApr 22, 2005
  31. Martin SchlemmerApr 22, 2005
  32. 1/5 Add http-pullDaniel Barkalow, Apr 17, 2005
  33. 4/5 Add option for hardlinkable cache of extracted blobsDaniel Barkalow, Apr 17, 2005
  34. Petr BaudisApr 17, 2005
  35. Daniel BarkalowApr 17, 2005
  36. Paul JacksonApr 17, 2005
  37. 5/5 Add commit-id to versionDaniel Barkalow, Apr 17, 2005

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