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Date: Sat, 28 Aug 1999 14:44:11 +0200
Message-Id: <[EMAIL PROTECTED]>
From: Roland Rosenfeld <[EMAIL PROTECTED]>
Subject: debian-policy: [PROPOSAL] mailbox locking
To: [EMAIL PROTECTED]
X-Mailer: bug 3.2.2
Sender: [EMAIL PROTECTED]
Package: debian-policy
Version: 3.0.1.1
Severity: normal
The Debian policy is not very clear in the definition of the way,
mailbox locking should be implemented. It only points to a "reference
implementation" (liblockfile), which is said to be NFS-safe, but it
isn't with Linux kernel 2.2.* (see other messages in debian-policy and
debian-devel about this problem).
So I propose to change the following paragraph:
All Debian MUAs and MTAs have to use the `maillock' and `mailunlock'
functions provided by the `liblockfile' packages to lock and unlock
mail boxes. These functions implement a NFS-safe locking mechanism.
(It is ok if MUAs and MTAs don't link against liblockfile but use a
_compatible_ mechanism. Please compare the mechanisms very carefully!)
I had a look over the mailbox locking programs and there are <25%
which use liblockfile, all others implement locking themselves (some
of them in a compatible way, some without...).
So I think we should change the above paragraph to something which
explicitly says, how locking has to be implemented:
All Debian MUAs, MTAs, MDAs and other mailbox accessing programs
(like IMAP daemons) have to lock the mailbox in a NFS-safe way.
This means that fcntl() locking has to be combined with dot
locking. To avoid dead locks, a program has to use fcntl() first
and dot locking after this or alternatively implement the two
locking methods in a non blocking way[1]. Using the functions
`maillock' and `mailunlock' provided by the `liblockfile*'[2]
packages is the recommended way to realize this.
Footnotes:
[1] If it is not possible to establish both locks, the system
shouldn't wait for the second lock to be established, but
remove the first lock, wait a (random) time, and start over
locking again.
[2] liblockfile version >= .... (fill in a version number here,
which implements the above noted non blocking mechanism
without blocking).
Thomas Roessler <[EMAIL PROTECTED]> posted a skeleton of maillock() to
debian-devel, maybe we should place this somewhere in the policy or in
/usr/[share/]doc/debian-policy/ or take this as a basis for a new
version of liblockfile:
int do_lock (const char *path, int fd, int retries)
{
int i;
int rv;
for (i = 0; i < retries; i++)
{
if ((rv = do_fcntl_lock (fd)) == -1 && errno != EAGAIN)
return -1;
else if (rv == 0)
{
if (do_dotlock (path) == 0)
return 0;
do_fcntl_unlock (fd);
}
sleep (rand() % 10);
}
return -1;
}
Ciao
Roland
---------------------------------------
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Subject: Fixed in debian-policy 3.1.0.0
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Date: Sat, 6 Nov 1999 21:13:58 +0000 (GMT)
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Message-Id: <[EMAIL PROTECTED]>
From: Julian Gilbey <[EMAIL PROTECTED]>
These bugs have been fixed in debian-policy 3.1.0.0; changelog follows.
Julian
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Julian Gilbey, Dept of Maths, QMW, Univ. of London. [EMAIL PROTECTED]
Debian GNU/Linux Developer, see http://www.debian.org/~jdg
Changes: debian-policy (3.1.0.0) unstable; urgency=low
.
* Add instructions on /usr/doc -> /usr/share/doc symlinks (closes:
#45561, #42447, #48570)
* Added source dependencies (closes: #41232)
* Deprecated /etc/rc.boot (closes: #32448, #32449)
* Update-rc.d now only legal way to automatically access /etc/rc?.d
directoried (closes: #41547)
* FHS compliant location of examples (closes: #42849)
* Added ispell-dictionary to virtual-packages.list (following new
suggestions: no objections => accept) (closes: #8221)
* Added man-browser to virtual-packages.list (closes: #24695)
* Added ident-server to virtual-packages.list (closes: #45307)
* Alphabeticised virtual packages list ;)
* Corrected GPL reference in proposal.sgml
* Clarification of "extra" priority (closes: #33076)
* Remove buggy and seriously problematic licenses from list of contrib
package criteria (closes: #45318)
* Move docs to /usr/share/doc with a compatibility symlink (closes:
#41829)
* Update to FHS 2.1 draft #3 (for /var/state etc. changes).
* Correct /var/lib/games -> /var/games (closes: #42358)
* Added MIME subpolicy (closes: #46516)
* Added support for VISUAL (closes: #41121)
* Clarify non-dependence on /usr/local (closes: #44922)
* Modified description of mail spool locking (closes: #43651)
* Clarified wording of conffiles and configuration files (closes:
#40766, #40767)
* Changed description of release numbers (closes: #44620)
* Added changelog.html -> changelog requirement (closes: $40934)
* packaging-manual now correctly installs its docs (closes: #44643)
* The packaging manual now discusses version numbers based on dates
(closes: #17621)
* Mention ls -f for testing order in which files appear on disk (closes:
#19179)
* Change order of '.' and '+' in description of version numbers (closes:
#41095)
* s/fields/field names/ in section 4.1 of packaging manual for clarity
* Add Build-Depends-Indep: field to control file
