opkg-utils: Fix update-alternatives link relocation

Recently Debian-style support for link relocation was added to
'update-alternatives' script, but it fails under circumstances where
host rootfs root directory differs from target rootfs root directory
and two alternative packages provide a symbolic link with source
located in different directories.

An example of the case is busybox provided /bin/rev (symlinking to
/bin/busybox.nosuid) and util-linux provided /usr/bin/rev (symlinking
to /usr/bin/rev.util-linux) in which case following failure occurs
during image recipe's do_rootfs() task:

  ERROR: core-image-minimal-1.0-r0 do_rootfs: Postinstall scriptlets of ['util-linux'] have failed. If the intention is to defer them to first boot,
  then please place them into pkg_postinst_ontarget_${PN} ().
  Deferring to first boot via 'exit 1' is no longer supported.
  Details of the failure are in .../tmp/work/qemux86-poky-linux/core-image-minimal/1.0-r0/temp/log.do_rootfs.
  ERROR: core-image-minimal-1.0-r0 do_rootfs: Function failed: do_rootfs

Looking in log.do_rootfs file, following relevant lines can be observed:

  update-alternatives: renaming rev link from /bin/rev to /usr/bin/rev
  mv: cannot stat '/bin/rev': No such file or directory

Mitigate issue by applying patch which adds target root filesystem root
directory path prefix to failing 'mv' calls relevant variable references

(From OE-Core rev: f0912e23629758fe4303284e7db8f4089bb7b4cb)

Signed-off-by: Niko Mauno <niko.mauno@iki.fi>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

0 files changed, 0 insertions, 0 deletions