[OE-core] [PATCH 3/4] systemd: split modules into packages

[Bottazzini, Bruno]

On Sex, 2015-03-27 at 14:11 -0300, Otavio Salvador wrote:
> On Fri, Mar 27, 2015 at 2:09 PM, Bottazzini, Bruno
> <bruno.bottazzini at intel.com> wrote:
> > On Sex, 2015-03-27 at 15:57 +0100, Anders Darander wrote:
> >> * Bottazzini, Bruno <bruno.bottazzini at intel.com> [150326 14:40]:
> >>
> >> > On Qui, 2015-03-26 at 08:56 -0300, Otavio Salvador wrote:
> >> > > On Thu, Mar 26, 2015 at 5:29 AM, Anders Darander <anders at chargestorm.se> wrote:
> >> > > > * Bruno Bottazzini <bruno.bottazzini at intel.com> [150325 22:50]:
> >>
> >> > > >> if one wants to launch a simple deamon, most modules are not
> >> > > >> required.
> >> > > >> He will be able to save space and exclude unwanted packages
> >> > > >> from the final image.
> >>
> >> > > > I like this, though I've got a few questions that I just noticed.
> >>
> >> > > >> -PACKAGECONFIG ??= "xz ldconfig \
> >> > > >> +PACKAGECONFIG ??= " \
> >> > > >> +                   gcrypt \
> >> > > >> +                   kmod \
> >> > > >> +                   ldconfig \
> >> > > >> +                   ${@bb.utils.contains('DISTRO_FEATURES', 'blkid', 'blkid', '', d)} \
> >> > > >> +                   ${@bb.utils.contains('DISTRO_FEATURES', 'efi', 'efi', '', d)} \
> >> > > >> +                   ${@bb.utils.contains('DISTRO_FEATURES', 'lz4', 'lz4', '', d)} \
> >> > > >> +                   ${@bb.utils.contains('DISTRO_FEATURES', 'xz', 'xz', '', d)} \
> >> > > >> +                   ${@bb.utils.contains('DISTRO_FEATURES', 'libidn', 'libidn', '', d)} \
> >> > > >> +                   ${@bb.utils.contains('DISTRO_FEATURES', 'acl', 'acl', '', d)} \
> >> > > >>                     ${@bb.utils.contains('DISTRO_FEATURES', 'pam', 'pam', '', d)} \
> >> > > >>                     ${@bb.utils.contains('DISTRO_FEATURES', 'x11', 'xkbcommon', '', d)}"
> >>
> >> > > > It might be worth noting that xz has gone from being explicitly enabled,
> >> > > > to depend on a DISTRO_FEATURES.
> >>
> >> > > Agreed and we shouldn't explode the number of possible dsitro
> >> > > features. I'd also prefer if xz were kept enable by default so we
> >> > > don't make a behavior change under the hood.
> >>
> >> > > ...
> >> > > >>  PACKAGECONFIG[resolved] = "--enable-resolved,--disable-resolved"
> >> > > >> -PACKAGECONFIG[networkd] = "--enable-networkd,--disable-networkd"
> >>
> >> > > > Why do you remove networkd as a PACKAGECONFIG?
> >>
> >> > > If there is a real reason for this, it must be recorded in commit log as well.
> >>
> >> > Guys, if you continue this patch you will see that networkd will always
> >> > be enabled. Systemd will always configure/make it however, the package
> >> > will not be installed if the user wants to.
> >>
> >> > With PACKAGECONFIG, we may not get everything "for free" as some data
> >> > files will be installed regardless as well as some components from
> >> > systemd cannot be disabled by their build system but we can run without
> >> > them, for instance we can run without journald.
> >>
> >> The advantage of also keeping the PACKAGECONFIG for e.g. networkd (and
> >> as much other things as possible) is that we're also reducing the build
> >> time and size. Sure, it might not be by much, but all small bits are
> >> valuable.
> >>
> >
> > You are right! Maybe we should mix them ?
> >
> > e.g. if PACKAGECONFIG networkd is disabled then the package
> > systemd-services-networkd will not be included.
> >
> > What do you think?
> 
> You can add the files conditionally so these empty packages won't be generated.

Indeed, do you know how to do this condition or have you got any
example?

>