Solaris 10 Issues With fetch-testmsg-whitelist

[Taso N. Devetzis-2]

Solaris 10 exposes a couple of issues with the code designed to delay
the HTTP fetch and mitigate the load on the servers in
fetch-testmsg-whitelist.

The script otherwise runs fine, it just does not add a sleep delay.

The `ps' command on Solaris 10 (and probably other SysV systems)
defaults to displaying processes with the same eUID and controlling
terminal as the invoker.  When run from a script from cron, no
controlling terminal is present and the command fails.

The `cksum' command on Solaris 10 inserts a TAB (instead of a space)
between the checksum and the octet count.  This breaks the `sed'
substitution command.

The following small patch resolves these issues on Solaris 10, and
should not break anything on other systems:

+ Add `-e' option to `ps'
+ Tweak `sed' regexp to include TABs

Note that there is TAB in the `sed' command (beware cut-and-paste).

Thanks,
/taso


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[Taso N. Devetzis-3]

"Taso N. Devetzis" <devetzis+dcc@...> writes:

> The following small patch resolves these issues on Solaris 10, and
> should not break anything on other systems:
>
> + Add `-e' option to `ps'
> + Tweak `sed' regexp to include TABs

I see that the mailing list strips attachments.  Since it is tiny I'll
include the patch inline (note the TAB).

I forgot to mention that this is against DCC 1.3.126.
 
Thanks,
/taso

--- fetch-testmsg-whitelist- Wed May 26 14:39:54 2010
+++ fetch-testmsg-whitelist Sat Aug 21 17:23:46 2010
@@ -71,7 +71,7 @@
 # Delay for an arbitrary, somewhat random number of seconds to try to spread
 #   the load on the HTTP server for the list. Some versions of cksum yield
 #   10 digit numbers that some versions of expr think are negative.
-RND=`ps | cksum | sed -e 's/  */ + /' -e 's/\([0-9]\{6\}\)\([0-9]\)/\1 + \2/g'`
+RND=`ps -e | cksum | sed -e 's/[ ]\{1,\}/ + /' -e 's/\([0-9]\{6\}\)\([0-9]\)/\1 + \2/g'`
 RND=`expr \( $RND \) % 123`
 sleep $RND
 
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[Vernon Schryver]

> From: "Taso N. Devetzis" <devetzis+dcc@...>

> I forgot to mention that this is against DCC 1.3.126.

It's worth repeating that the script runs but without the somewhat
random delay.

> +RND=`ps -e | cksum | sed -e 's/[ ]\{1,\}/ + /' -e 's/\([0-9]\{6\}\)\([0-9]\)/\1 + \2/g'`

`ps -e` on FreeBSD 8.1 can whine
"ps: Process environment requires procfs(5)"

So I guess the fix will have to depend on a new ./configure variable,
or use some other command as a source of some entropy such as `ls -lia`.


thanks,
Vernon Schryver    vjs@...
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[Taso N. Devetzis-3]

Vernon Schryver <vjs@...> writes:

> `ps -e` on FreeBSD 8.1 can whine
> "ps: Process environment requires procfs(5)"

Interesting.  I verified on OpenBSD prior to submitting but I do not
have a FreeBSD system.  Good catch.

> So I guess the fix will have to depend on a new ./configure variable,
> or use some other command as a source of some entropy such as `ls -lia`.

Sounds portable (for POSIX systems at least).

Thanks,
/taso
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[John R. Levine]

I have moved my DCC server to a dual processor 2.6 GHz AMD64 with 12G of
memory.  (Not a bad computer for under $500, including the six 73G 15K rpm
hot swap disks.)

The new server has the same IP address as the old one so other than a burp
a few minutes ago as I took the old server down and brought the new one
up, it shouldn't look very different.  Just a lot faster.

Regards,
John Levine, johnl@..., Primary Perpetrator of "The Internet for Dummies",
Information Superhighwayman wanna-be, http://www.johnlevine.com, ex-Mayor
Please consider the environment before sending this e-mail.
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