oeqa/utils/postactions: transfer whole archive over ssh instead of doing individual copies

Fixes [YOCTO 15536]

The postactions retrieval actions currently rely on scp executed
individually on any file or directory expanded from
TESTIMAGE_FAILED_QA_ARTIFACTS. Unfortunately, symlinks are not preserved
with this mechanism, which lead to big storage space consumption. Things
may go even worse if those symlinks create some circular chains. This
mechanism then needs to be updated to preserve symlinks instead of
following them during copy. There are multiple ways to do it:
- create a local archive on the target and execute scp on this file
- use rsync instead of scp for all files
- create an archive and pipe it to ssh instead of storing it onto the
  target

The first solution may create pressure on targets storage space, while the
second assumes that rsync is installed on the target, which may not be
true. So the third one is a compromise: tar is very likely present, at
least through busybox, and no disk space is used on the target.

Replace the current per-file scp call by a single call to tar run on the
target. Retrieve the generated compressed archive directly from SSH output,
and feed it to another tar process but on host, to uncompress and extract
it at the same place as before.

(From OE-Core rev: 8b5c66c91d94f4c8521fe9443e65d86063dba5e5)

Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 4aeb10aa38efc6768928fbb74985e36e972b8e46)
Signed-off-by: Steve Sakoman <steve@sakoman.com>

0 files changed, 0 insertions, 0 deletions