IOError - cannot create file (linux daemon-invoked script)
fpm at u.washington.edu
Sun Jan 3 23:20:19 CET 2010
On Jan 2, 8:02 pm, Cameron Simpson <c... at zip.com.au> wrote:
> On 02Jan2010 15:21, cassiope <f... at u.washington.edu> wrote:
> | [...] I want
> | to save a copy of the email in a particular directory which is
> | accessible to the Windows clients via samba.
> | The strange thing is that even with the right user-id, I cannot seem
> | to write to the directory, getting an IOError exception. Changing the
> | directory to world-writable fixes this. I can confirm the uid and gid
> | for the script by having the script print these values just before
> | trying to create/write the file. Becoming the same lesser user, I
> | have no problem writing a file to the same directory.
> Can you show us:
> - the directory user and group ownership and permissions
> - the daemon's user and group values?
Directory permissions: 774
Directory ownership: "lesser user", "special group" where /etc/group
"special group" members including the "lesser user", as well as
who are expected to use the daemon, but not root.
Script ownership: "lesser user"; permissions 755
Daemon ownership: root; permissions: 755 (always started by root).
The script also has to connect to a postgresql database for part of
work - that part works,
> You can also strace your daemon:
> strace -f -e trace=file your-daemon your-daemon-args... 2>strace.out
> and then examine the log for the precise UNIX-level failure.
> Cameron Simpson <c... at zip.com.au> DoD#743http://www.cskk.ezoshosting.com/cs/
> Money won't buy happiness, but it will pay the salary of a large research
> staff to study the problem. - Bill Vaughan
Thanks, Cameron (and Steve and Christian). My first shot with strace
been awhile since I've used that - I think your syntax may be a tiny
- but it's probably the tool I need to use. Will explore further...
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