[oe] does specifying "--with-mpm=prefork" for apache2 require ugly manual hacking?

[Derek Straka]

Since they call out the specific version of 2.4.16, I assume this is based
on the jethro branch.  I suppose the multiprocessing module could probably
be a PACKAGECONFIG option[1].  There are several competing multiprocessing
modules that can be configured statically or as shared for dynamic loading
(event[1] vs worker[2] vs prefork[3]).

As far as the do_install_append goes, the installed configuration files for
apache get built up as part of the build from a set of templates in
./docs/conf/.  The uncommenting of the mpm line might be part of a
PACAKGECONFIG, but the other lines appear to be specific to their use case
rather than generally applicable to using the prefork module: for example,
they are setting the port to 8081 from port 80 (You can also specify the
port at configure time with --port=PORT).

-Derek

[1] - https://httpd.apache.org/docs/2.4/mpm.html
[2] - https://httpd.apache.org/docs/2.4/mod/event.html
[3] - https://httpd.apache.org/docs/2.4/mod/worker.html
[4] - https://httpd.apache.org/docs/2.4/mod/prefork.html

On Tue, Mar 7, 2017 at 8:05 AM, Robert P. J. Day <rpjday at crashcourse.ca>
wrote:

>
>   just ran across the following situation in that an OE build
> (actually, wind river linux, but that should make no difference) has a
> bbappend file, "apache2_2.4.16.bbappend", that appears to be going to
> a great deal of trouble to simply specify "--with-mpm=prefork":
>
> EXTRA_OECONF += " --with-mpm=prefork "
>
> do_install_append() {
>                 # Make a backup of the original httpd.conf file
>     cp ${D}/${sysconfdir}/${BPN}/httpd.conf ${D}/${sysconfdir}/${BPN}/
> httpd.conf.orig
>
>     # Remove the two offending lines (to be replaced with the correct
> ones), as well as uncommenting the mpm include directive.
>     sed -r 's_^IncludeOptional\s+/etc/apache2/conf.d/\*.conf__' <
> ${D}/${sysconfdir}/${BPN}/httpd.conf.orig | sed -r
> 's_^IncludeOptional\s+/etc/apache2/modules.d/\*.conf__' | sed -r
> 's_^#Include\s+etc/apache2/extra/httpd-mpm.conf_Include
> etc/apache2/extra/httpd-mpm.conf_' | sed -r 's_^Listen 80$_Listen
> 80\n#Temporary use by minion\nListen 8081_' > ${D}/${sysconfdir}/${BPN}/
> httpd.conf
>
>     # Replacing the two lines removed previously with the correct ones.
> Loading the modules first, then configure them.
>     printf "\nIncludeOptional ${sysconfdir}/${BPN}/modules.d/*.load" >>
> ${D}/${sysconfdir}/${BPN}/httpd.conf
>     printf "\nIncludeOptional ${sysconfdir}/${BPN}/conf.d/*.conf" >>
> ${D}/${sysconfdir}/${BPN}/httpd.conf
> }
>
>   i'm unclear on what is happening above, but it seems that asking for
> a simple configuration like that should be available with something as
> basic as adding an option, or selecting PACKAGECONFIG.
>
>   am i missing something? is all of the above really necessary to do
> something that looks fairly straightforward?
>
> rday
>
> --
>
> ========================================================================
> Robert P. J. Day                                 Ottawa, Ontario, CANADA
>                         http://crashcourse.ca
>
> Twitter:                                       http://twitter.com/rpjday
> LinkedIn:                               http://ca.linkedin.com/in/rpjday
> ========================================================================
>
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