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bug#17330: thanks for the comments
From: |
Philip Hodges |
Subject: |
bug#17330: thanks for the comments |
Date: |
Sun, 4 May 2014 00:43:25 +0200 |
thanks for all the discussion contributions.
I'm really happy about having my own personal same day lisp fix working for me
to stop cd-absolute believing the false negative from the check_executable
function. My best hope for the remaining subprocess cwd cases is to look at the
samba configuration and see if I can get it improved, and maybe add a user to
the cygwin passwd file.
Anything involving a rebuild and new release will take months before it is
available for me to use where I need it.
For completeness, and in the spirit of DRY, whatever uses start-process and
call-process *could* be refactored to share the same code to offer the same
override as file-executable-p in the same situation. And while we are about it,
can we please not ask if a file is executable when we really just want to know
if it is a searchable directory suitable for cd.
I don't see how we can ever completely rule out false negatives, unless we are
prepared to change check_executable to actually try to use the directory (cd to
it, open it, list its entries, return t, whatever). Even the euidaccess man
page warns against using it: "Generally, it is safer just to attempt the
desired operation and handle any permission error that occurs". But I do accept
that there may well be no consensus to follow through with more reliable or
less gullible code. If it is just a few legacy platforms that lack euidaccess
and fall back to checking the wrong uid with access, then never mind. If we can
prove that the native and cygwin builds behave differently, then the offending
library function can probably be fixed long before emacs can work around it.
Thank you for pushing that suggestion.
My samba share is also afflicted with false negative writeable checks, as
described here two years ago:
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=10257
I connect to the samba filesystem directly in Windows as a user without local
administrator rights. I'll let you know if mounting it from cygwin with special
acl options confers more appropriate access permissions or even works at all.
- bug#17330: thanks for the comments,
Philip Hodges <=
- bug#17330: files.el cd-absolute overcome false negative from file-executable-p, Philip Hodges, 2014/05/04
- bug#17330: files.el cd-absolute overcome false negative from file-executable-p, Eli Zaretskii, 2014/05/04
- bug#17330: files.el cd-absolute overcome false negative from file-executable-p, Eli Zaretskii, 2014/05/06
- bug#17330: files.el cd-absolute overcome false negative from file-executable-p, Stefan Monnier, 2014/05/06
- bug#17330: files.el cd-absolute overcome false negative from file-executable-p, Glenn Morris, 2014/05/06
- bug#17330: files.el cd-absolute overcome false negative from file-executable-p, Philip Hodges, 2014/05/11