[Buildroot] [PATCH 1/1] postgresql: change systemd service type to notify

[Yann E. MORIN <yann.morin.1998@free.fr>]

Joseph, All,

On 2018-08-21 23:47 +0200, Yann E. MORIN spake thusly:
> On 2018-06-29 11:31 -0700, Joseph Kogut spake thusly:
> > During activation, pg_ctl uses exec to start the db server, which causes
> > the service to never finish activating when Type=forking. Upstream
> > recommends configuring --with-systemd and using Type=notify.
> > 
> > https://www.postgresql.org/docs/10/static/server-start.html
> > Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
> 
> As I said on IRC, this should be actually two patches:
>   - the first to add the missing conditional code in the .mk;
>   - the second to change the type of the unit file.

And now that I have read the upstream doc you pointed to (sorry for
delaying that), maybe it makes sense to have a single patch afterall.

Upstream says:

    When using systemd, you can use the following service unit file
    [...]
    Using Type=notify requires that the server binary was built with
    configure --with-systemd.

So, it is quite sensible that the type of the unit file is changed, and
that the same commit also adds the conditional code in the .mk file. But
that warrants a bit more explanations in the commit log, maybe just by
quoting the same as I did above?

Also, why don't we use just the unit file suggested by upstream, instead
of our own canned version?

Regards,
Yann E. MORIN.

> But see below for an actual question...
> 
> > ---
> >  package/postgresql/postgresql.mk      |  8 ++++++++
> >  package/postgresql/postgresql.service | 12 ++++++++----
> >  2 files changed, 16 insertions(+), 4 deletions(-)
> > 
> > diff --git a/package/postgresql/postgresql.mk b/package/postgresql/postgresql.mk
> > index 94b3e60e59..70c667dc0e 100644
> > --- a/package/postgresql/postgresql.mk
> > +++ b/package/postgresql/postgresql.mk
> > @@ -70,6 +70,14 @@ else
> >  POSTGRESQL_CONF_OPTS += --without-ldap
> >  endif
> >  
> > +# required for postgresql.service Type=notify
> > +ifeq ($(BR2_PACKAGE_SYSTEMD),y)
> > +POSTGRESQL_DEPENDENCIES += systemd
> 
> Is it a build-time dependency at all, or is it needed only at runtime?
> 
> Regards,
> Yann E. MORIN.
> 
> > +POSTGRESQL_CONF_OPTS += --with-systemd
> > +else
> > +POSTGRESQL_CONF_OPTS += --without-systemd
> > +endif
> > +
> >  define POSTGRESQL_USERS
> >  	postgres -1 postgres -1 * /var/lib/pgsql /bin/sh - PostgreSQL Server
> >  endef
> > diff --git a/package/postgresql/postgresql.service b/package/postgresql/postgresql.service
> > index 4a96258684..53e6f84f00 100644
> > --- a/package/postgresql/postgresql.service
> > +++ b/package/postgresql/postgresql.service
> > @@ -3,7 +3,7 @@ Description=PostgreSQL database server
> >  After=network.target
> >  
> >  [Service]
> > -Type=forking
> > +Type=notify
> >  
> >  # start timeout disabled because initdb may run a little
> >  # longer (eg. 5 minutes on RaspberryPi)
> > @@ -12,13 +12,17 @@ TimeoutStartSec=0
> >  User=postgres
> >  Group=postgres
> >  
> > +StandardOutput=syslog
> > +StandardError=syslog
> >  SyslogIdentifier=postgres
> >  PIDFile=/var/lib/pgsql/postmaster.pid
> >  
> >  ExecStartPre=/bin/sh -c "if [ ! -f /var/lib/pgsql/PG_VERSION ]; then /usr/bin/pg_ctl initdb -D /var/lib/pgsql; fi"
> > -ExecStart=/usr/bin/pg_ctl start -D /var/lib/pgsql -w -l /var/lib/pgsql/logfile
> > -ExecReload=/usr/bin/pg_ctl reload -D /var/lib/pgsql
> > -ExecStop=/usr/bin/pg_ctl stop -D /var/lib/pgsql -m fast
> > +ExecStart=/usr/bin/postgres -D /var/lib/pgsql
> > +ExecReload=/usr/bin/kill -HUP $MAINPID
> > +KillMode=mixed
> > +KillSignal=SIGINT
> > +TimeoutSec=0
> >  
> >  [Install]
> >  WantedBy=multi-user.target
> > -- 
> > 2.18.0
> > 
> > _______________________________________________
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> > buildroot at busybox.net
> > http://lists.busybox.net/mailman/listinfo/buildroot
> 
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.-----------------.--------------------.------------------.--------------------.
|  Yann E. MORIN  | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
| +33 662 376 056 | Software  Designer | \ / CAMPAIGN     |  ___               |
| +33 223 225 172 `------------.-------:  X  AGAINST      |  \e/  There is no  |
| http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL    |   v   conspiracy.  |
'------------------------------^-------^------------------^--------------------'