[Buildroot] [PATCH 02/11] ejabberd: simplify init script by patching ejabberdctl

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

Dear Johan Oudinet,

On Wed,  8 Jul 2015 11:54:15 +0200, Johan Oudinet wrote:
> Let a user modify environment variables used in ejabberdctl by loading
> a default configuration file.
> 
> Signed-off-by: Johan Oudinet <johan.oudinet@gmail.com>
> ---
>  package/ejabberd/0009-fix-ejabberdctl.patch | 21 +++++++++++++++++++
>  package/ejabberd/S50ejabberd                | 32 +++++++++++++----------------
>  2 files changed, 35 insertions(+), 18 deletions(-)
>  create mode 100644 package/ejabberd/0009-fix-ejabberdctl.patch
> 
> diff --git a/package/ejabberd/0009-fix-ejabberdctl.patch b/package/ejabberd/0009-fix-ejabberdctl.patch
> new file mode 100644
> index 0000000..9ae23ac
> --- /dev/null
> +++ b/package/ejabberd/0009-fix-ejabberdctl.patch
> @@ -0,0 +1,21 @@
> +Description: fix ejabberdctl
> + Change default values so ejabberdctl run commands as ejabberd user
> + Also add a way for the user to change default values.
> +Signed-off-by: Johan Oudinet <johan.oudinet@gmail.com>
> +
> +diff --git a/ejabberdctl.template b/ejabberdctl.template
> +index 79f4438..df0abba 100755
> +--- a/ejabberdctl.template
> ++++ b/ejabberdctl.template
> +@@ -14,7 +14,10 @@ SCRIPT_DIR=`cd ${0%/*} && pwd`
> + ERL={{erl}}
> + IEX={{bindir}}/iex
> + EPMD={{bindir}}/epmd
> +-INSTALLUSER={{installuser}}
> ++INSTALLUSER=ejabberd

So this makes the patch Buildroot specific. Why isn't the
{{installuser}} properly replaced by the "right" value at install time?

> ++
> ++# Read default configuration file if present.
> ++[ ! -r /etc/default/ejabberd ] || . /etc/default/ejabberd

I don't really understand why we are loading this default file here and
in the init script itself. Who is installing this /etc/default/ejabberd
file? What does it contain?

> + 
> + # check the proper system user is used if defined
> + if [ "$INSTALLUSER" != "" ] ; then
> diff --git a/package/ejabberd/S50ejabberd b/package/ejabberd/S50ejabberd
> index ff38d92..2161ead 100644
> --- a/package/ejabberd/S50ejabberd
> +++ b/package/ejabberd/S50ejabberd
> @@ -3,30 +3,26 @@
>  # Start/stop ejabberd
>  #
>  
> -NAME=ejabberd
> -USER=ejabberd
> +CTL=/usr/sbin/ejabberdctl
> +DEFAULT=/etc/default/ejabberd
> +INSTALLUSER=ejabberd
>  RUNDIR=/var/run/ejabberd
> -SPOOLDIR=/var/lib/ejabberd
>  
> -# Read configuration variable file if it is present.
> -[ -r /etc/default/$NAME ] && . /etc/default/$NAME
> +# Read default configuration file if present.
> +[ -r "$DEFAULT" ] && . "$DEFAULT"

And we're reading the /etc/default/ejabberd file here as well.

Can you give some more details about what is going on?

>  
> +# Create RUNDIR.
>  mkrundir() {
> -    install -d -o "$USER" -g "$USER" "$RUNDIR" "$SPOOLDIR"
> -}
> -
> -# Run ejabberdctl as user $USER.
> -ctl() {
> -    su $USER -c "ejabberdctl $*"
> +    install -d -o "$INSTALLUSER" -g "$INSTALLUSER" "$RUNDIR"
>  }
>  
>  case "$1" in
>      start)
>          mkrundir || exit 1
>          echo -n "Starting ejabberd... "
> -        ctl start --spool "$SPOOLDIR"
> +        "$CTL" start
>          # Wait until ejabberd is up and running.
> -        if ctl started; then
> +        if "$CTL" started; then
>              echo "done"
>          else
>              echo "failed"
> @@ -34,23 +30,23 @@ case "$1" in
>          ;;
>      stop)
>          echo -n "Stopping ejabberd... "
> -        ctl stop > /dev/null
> -        if [ $? -eq 3 ] || ctl stopped; then
> +        "$CTL" stop > /dev/null
> +        if [ $? -eq 3 ] || "$CTL" stopped; then
>              echo "OK"
>          else
>              echo "failed"
>          fi
>          ;;
>      status)
> -        ctl status
> +        "$CTL" status
>          ;;
>      restart|force-reload)
> -        "$0" stop
> +        "$0" stop || true

This change doesn't seem to be related.

>          "$0" start
>          ;;
>      live)
>          mkrundir || exit 1
> -        ctl live
> +        "$CTL" live
>          ;;
>      *)
>          echo "Usage: $0 {start|stop|status|restart|force-reload|live}"

Thanks,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com