bugfindutils - Bugs: bug #22057, updatedb "atomic rename"...

 
 

bug #22057: updatedb "atomic rename" is not atomic

Submitted by:  Andreas Metzler <ametzler>
Submitted on:  Sat 19 Jan 2008 07:04:43 PM UTC  
 
Category:  updatedb Severity:  3 - Normal
Item Group:  None Status:  Fixed
Privacy:  Public Assigned to:  James Youngman <jay>
Originator Name:  Justin Pryzby Open/Closed:  Closed
Release:  4.3.12 Fixed Release:  4.3.13

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Sat 09 Feb 2008 10:17:20 AM UTC, comment #2: 

Fixed in 4.3.x.

James Youngman <jay>
Project AdministratorIn charge of this item.
Fri 25 Jan 2008 09:46:22 PM UTC, comment #1: 

Running instances of locate will not notice, due to the semantics of Unix filesystems. 

The resut may not be portable to Cygwin, but I think that's a matter best dealt with - if necessary - by patches in the Cygwin port.

James Youngman <jay>
Project AdministratorIn charge of this item.
Sat 19 Jan 2008 07:04:43 PM UTC, original submission:  

This is http://bugs.debian.org/461585

8X-----------------------------------
An atomic rename involves a "mv" without an "rm", with the chmod on
the .n file beforehand.

|# To reduce the chances of breaking locate while this script is running,
|# put the results in a temp file, then rename it atomically.
|if test -s $LOCATE_DB.n; then
|  rm -f $LOCATE_DB
|  mv $LOCATE_DB.n $LOCATE_DB
|  chmod 644 $LOCATE_DB
|else
8X-----------------------------------

I am forwarding this, since I am undecided whether this is actually a bug. Replacing

rm ; mv ; chmod

with

chmod 644 $LOCATE_DB.n
mv $LOCATE_DB.n $LOCATE_DB

has the bonus that $LOCATE_DB is present all the time. The downside is that an already running locate process might act strangely if its input data is changing.

cu andreas

Andreas Metzler <ametzler>

 

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    Follow 8 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2008-02-14 jay Open/ClosedOpen => Closed
        Fixed ReleaseNone => 4.3.13
    2008-02-09 jay StatusIn Progress => Fixed
    2008-01-25 jay StatusNone => In Progress
        Assigned toNone => jay
        ReleaseNone => 4.3.12
    2008-01-19 ametzler Carbon-CopyRemoved 20807 => -
    2008-01-19 ametzler Carbon-Copy- => Added 461585-submitter@bugs.debian.org

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