[gentoo-dev] per-runlevel make.conf settings

[Aaron Walker]

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Hey folks,

I had this idea a while ago, to solve the problem of having different
make.conf settings per-runlevel.  I was bored at work last night, so
finally decided to implement it.  Figured I'd post it, since others
might also find it useful (not to mention offer suggestions, comments, etc).

With my laptop, I use different runlevels, depending on where I'm at
(work, home, etc).  I used to just have an rc script that symlinked
make.conf to the appropriate one, but this solution is definitely better,
although still not perfect.

make.conf.common - settings common to all make.conf's
make.conf.$runlevel - per-runlevel settings, where $runlevel is the current
runlevel.

There are obviously certain settings you wouldn't want to differ, like
CFLAGS, CHOST, etc, which should go in make.conf.common.

The following is example contents for a common file, one for default
runlevel, and one for a "work" runlevel.

<make.conf.common>
# vim: set ft=conf
CFLAGS="-O2 -march=athlon-xp -pipe"
CXXFLAGS="${CFLAGS}"
CHOST="i686-pc-linux-gnu"
USE="blah blah blah"
FEATURES="ccache collision-protect sfperms strict"
GENTOO_MIRRORS="ftp://ftp.ucsb.edu/pub/mirrors/linux/gentoo \
~ ftp://gentoo.chem.wisc.edu/gentoo"
</make.conf.common>

<make.conf.default>
FEATURES="${FEATURES} distcc cvs digest sign"
MAKEOPTS="-j5"
PORTAGE_GPG_DIR="/home/ka0ttic/.gnupg"
PORTAGE_GPG_KEY="ED34A45E"
SYNC=rsync://zeus/gentoo-portage
GENTOO_MIRRORS="http://zeus/gentoo/ \
${GENTOO_MIRRORS}"
</make.conf.default>

<make.conf.work>
MAKEOPTS="-j2"
SYNC=rsync://some_rsync_server_only_accessible_from_work/gentoo-portage
DISTDIR="/path/to/some/nfs/mounted/distdir"
</make.conf.work>

As you can see, you can do cool stuff like override variables, or extend
variables (eg FEATURES in make.conf.default).

We can then create an amazingly simple init script that automatically
generates /etc/make.conf depending on runlevel:

<makeconfgen>
#!/sbin/runscript

depend() {
~    before local
}

start() {
~    local rv=0 runlevel=$(< ${svcdir}/softlevel)

~    ebegin "Generating make.conf for $runlevel runlevel"

~    # save existing make.conf just in case
~    [ -e /etc/make.conf ] && \
~        mv /etc/make.conf /etc/make.conf.save || rv=1
~    # common stuff
~    [ -f /etc/make.conf.common ] && \
~        cat /etc/make.conf.common > /etc/make.conf || rv=1
~    # runlevel stuff
~    [ -f /etc/make.conf.$runlevel ] && \
~        cat /etc/make.conf.$runlevel >> /etc/make.conf || rv=1

~    eend $rv
}
</makeconfgen>

The only caveat I can think of at the moment (I'm sure there's more) is
that you must remember to 'rc-update add' it each runlevel you want one
generated for.  Otherwise, the make.conf will be the previously generated
one.

Comments/suggestions/flames?

Toodles
- --
You will have many recoverable tape errors.

Aaron Walker < ka0ttic@g.o >	http://dev.gentoo.org/~ka0ttic/
Gentoo/BSD | cron | shell-tools		http://butsugenjitemple.org/~ka0ttic/

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