[Buildroot] [PATCH 00/13] system: add support for merged-bin (branch yem/merged-bin)

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

Hello All!

This series introduces support for so-called merged-bin, where /usr/sbin
is merged with /sur/bin, as an extra step after merged-usr, now
requested, and later required in a relatively close future, by systemd.

The series is organised in 4 main steps::

 1. patches 1-3 are cleanups in the Kconfig menu, related to the
    merged-usr prompt, to the defaults for PATH, and to the rationale
    for selecting merged-usr with systemd; those can be applied without
    considering the rest of the series;

 2. then patches 4-6 prepare support/scripts/check-merged-usr.sh to
    check for more than merged-usr: a good cleanup, and better check the
    merged state; those patch can also be applied without considering
    the rest of the series;

 3. with patches 7-9, support for merged-bin is added, and made mandatory
    for systemd;

 4. finally, patches 10-13 introduce workarounds for a few packages to
    properly support merged-bin. For ease of review, those are separate
    patches, but that means the series _may_ break if the merged-bin
    support is applied but not the per-package workarounds.

Although the series was tested with a large set of packages and a large
set of toolchains, and although it is a critical change, it is still
pretty well confined to just a few spots.

Regards,
Yann E. MORIN.


----------------------------------------------------------------
Yann E. MORIN (13):
      system: reword merged-usr prompt
      system: drop superfluous negative condition for default PATH
      package/systemd: select merged-usr from package, not init
      support/scripts: comonalise checking merged status
      support/scripts: fix and restrict conditions to accept merged dirs
      support/scripts: rename check-merged-usr.sh
      support/scripts; teach check-merged what to check
      system: add support for merged /usr/sbin (aka merged-bin)
      package/systemd: require merged-bin
      package/coreutils: no need for chroot workaround with merged-bin
      package/kmod: adjust paths for merged-bin
      package/util-linux: adjust paths for merged-bin
      toolchain/external: support merged-bin

 Makefile                                   | 11 ++---
 package/coreutils/coreutils.mk             |  2 +
 package/kmod/kmod.mk                       | 12 +++++-
 package/skeleton-custom/skeleton-custom.mk | 10 +++--
 package/systemd/Config.in                  |  2 +
 package/util-linux/util-linux.mk           |  8 +++-
 support/scripts/check-merged               | 65 ++++++++++++++++++++++++++++++
 support/scripts/check-merged-usr.sh        | 39 ------------------
 system/Config.in                           | 20 +++++----
 system/skeleton/usr/sbin/.empty            |  0
 system/system.mk                           | 11 +++++
 toolchain/helpers.mk                       |  8 +++-
 12 files changed, 128 insertions(+), 60 deletions(-)
 create mode 100755 support/scripts/check-merged
 delete mode 100755 support/scripts/check-merged-usr.sh
 delete mode 100644 system/skeleton/usr/sbin/.empty

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