[
https://issues.apache.org/jira/browse/JENA-1219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15400073#comment-15400073
]
Andy Seaborne commented on JENA-1219:
-------------------------------------
Re: (1) The single quotes is already inside a " " so substitution happens once.
> fuseki init script problems - FUSEKI_USER doesn't work - shell quoting wonky
> ----------------------------------------------------------------------------
>
> Key: JENA-1219
> URL: https://issues.apache.org/jira/browse/JENA-1219
> Project: Apache Jena
> Issue Type: Bug
> Components: Fuseki
> Affects Versions: Fuseki 2.3.1
> Environment: RHEL 6
> Reporter: Dan Pritts
> Priority: Minor
>
> another init script issue.
> If FUSEKI_USER is defined, the script attempts to su to that user. Here's
> the original code snippet.
> su - "$FUSEKI_USER" -c "
> log_daemon_msg "Redirecting Fuseki stderr/stdout to
> $FUSEKI_LOGS_STDERROUT"
> exec ${RUN_CMD[*]} &> '$FUSEKI_LOGS_STDERROUT' &
> disown \$!
> echo \$! > '$FUSEKI_PID'"
> There are several problems with this.
> 0) log_daemon_msg doesn't exist in this subshell so it throws an error. I
> filed a separate bug about this.
> 1) the quoting is problematic, so as written, it doesn't successfully start
> the software.
> I think what happens is that the double-quote before the word `Redirecting`
> closes out the argument to `-c`;
> then the exec happens, but the FUSEKI_LOGS_STDERROROUT is not expanded
> because it's inside single quotes.
> Without the log file, I'm not sure why it doesn't start properly, i didn't
> troubleshoot further down this path.
> 2) if you "exec" something, the exec'd program *replaces* the running
> process, so the "disown" and "echo" command never have a chance to run.
> I would suggest the following, but I'm not entirely sure of the design goal
> behind the code snippet so i am not sure it meets the needs.
> su "$FUSEKI_USER" -c "
> echo Redirecting Fuseki stderr/stdout to $FUSEKI_LOGS_STDERROUT
> ${RUN_CMD[*]} &> $FUSEKI_LOGS_STDERROUT &
> disown \$!
> echo \$! > $FUSEKI_PID "
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
