[OE-core] [Draft design][RFC] Running postinst at rootfs generation time

[Cui, Dexuan]

Hi all, below is an initial investigation about the task and we'll continue to further look into it.

In poky we have 2 types of postinst scripts:  one (type-1) can be (and has already been) run at rootfs generation time and the other (type-2) has to be delayed to the first-boot of target device. Type-2 makes target device's first-boot slow and it would be great if we can fix it and convert it to type-1.

We can instrument a first-boot with minimal/sato first to see which postinstalls take the most time and then prioritise those ones to fix.

I figurerd out a list of 33 recipes in total(recipes with the same name but with different versions are counted once) we possibly need to fix.
For the recipes, we need try to find recipe-specific ways(use appropriately modified native utilities to generate caches, files, etc as necessary on the target filesystem).

11 recipes: these could be easily fixed if we add the properly-adjusted utilities "adduser, addgroup, pwconv, etc". Scott is actually adding the utilites: http://git.pokylinux.org/cgit/cgit.cgi/poky-contrib/commit/?h=sgarman/useradd-rebased&id=99e54d9696104ed38ec1e3464e17aa1f9b8d98ac
meta/recipes-devtools/distcc/distcc_2.18.3.bb
meta/recipes-extended/cronie/cronie_1.4.7.bb
meta/recipes-extended/at/at_3.1.12.bb:47
meta/recipes-support/hal/hal.inc:45
meta/recipes-core/dbus/dbus.inc:49
meta/recipes-connectivity/openssh/openssh_5.8p2.bb
meta/recipes-connectivity/ppp-dialin/ppp-dialin_0.1.bb
meta/recipes-graphics/x11-common/xserver-nodm-init.bb
meta/recipes-multimedia/pulseaudio/pulseaudio.inc:87
meta/recipes-extended/shadow/shadow_4.1.4.3.bb:125
meta/classes/libc-package.bbclass

6  recipes: these should be easily fixed since the scripts are not related to special native utilites.
meta/recipes-extended/sudo/sudo.inc
meta/recipes-extended/sysklogd/sysklogd.inc
meta/classes/update-rc.d.bbclass
meta/recipes-connectivity/ppp/ppp_2.4.5.bb
meta/recipes-graphics/pango/pango.inc
meta/recipes-gnome/gtk+/gtk+.inc
 
4 recipes: we may need to add gtk-update-icon-cache-native.
meta/classes/gtk-icon-cache.bbclass
meta/recipes-gnome/librsvg/librsvg_2.32.1.bb
meta/recipes-gnome/gdk-pixbuf/gdk-pixbuf_2.22.1.bb
meta/recipes-sato/sato-icon-theme/sato-icon-theme.inc

3 recipes: need to add gconftool-2-native?
meta/classes/gconf.bbclass
meta/recipes-graphics/mutter/mutter.inc
meta/recipes-sato/matchbox-sato/matchbox-session-sato_0.1.bb

3 recipes: "dpkg --configure, opkg-cl configure": looks it's possible to fix them if we specify proper parematers?
meta/recipes-devtools/dpkg/dpkg.inc
meta/recipes-devtools/opkg/opkg_svn.bb
meta/recipes-devtools/opkg/opkg_0.1.8.bb

1 recipe: prelink: we could propablly fix it, but I'm not sure yet.
meta/recipes-devtools/prelink/prelink_git.bb

1 recipe: "/etc/init.d/populate-volatile.sh update ; DBUSPID=`pidof dbus-daemon`": We can't fix this one.
meta/recipes-connectivity/wpa-supplicant/wpa-supplicant-0.7.inc

The below 4 recipes need the related utilities and need more investigation. 

1 recipe: update-modules
meta/recipes-kernel/update-modules/update-modules_1.0.bb

1 recipe: systemctl
meta/recipes-connectivity/avahi/avahi.inc

1 recipe: fc-cache
meta/recipes-graphics/ttf-fonts/liberation-fonts_1.04.bb:37

1 recipe: gtk-query-immodules-2.0
meta/recipes-sato/matchbox-keyboard/matchbox-keyboard_git.bb

Thanks,
-- Dexuan