[OE-core] [PATCH] license.bbclass: fix warnings when run in unprivileged "container" env

[Bjørn Forsman]

An unprivileged "container" environment like this[1] doesn't have root
account (uid 0) which causes tons of "Invalid argument" warnings:

  $ bitbake ...
  ...
  WARNING: Could not copy license file [src] to [dest]: [Errno 22] Invalid argument: '[src]'
  WARNING: Could not copy license file [src] to [dest]: [Errno 22] Invalid argument: '[src]'
  WARNING: Could not copy license file [src] to [dest]: [Errno 22] Invalid argument: '[src]'
  ...

Fix it by handling EINVAL similar to existing handling of EPERM (which
was added for when not running under pseudo).

[1]: The real environemnt is buildFHSUserEnv from NixOS/nixpkgs, but a
  demonstration of the issue can be done like this:

    $ touch f
    $ unshare --user --mount chown 0:0 f
    chown: changing ownership of ‘f’: Invalid argument

Signed-off-by: Bjørn Forsman <bjorn.forsman at gmail.com>
---
 meta/classes/license.bbclass | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/meta/classes/license.bbclass b/meta/classes/license.bbclass
index ba95c9a..94be559 100644
--- a/meta/classes/license.bbclass
+++ b/meta/classes/license.bbclass
@@ -354,9 +354,11 @@ def copy_license_files(lic_files_paths, destdir):
                     os.chown(dst,0,0)
                 except OSError as err:
                     import errno
-                    if err.errno == errno.EPERM:
-                        # suppress "Operation not permitted" error, as
-                        # sometimes this function is not executed under pseudo
+                    if err.errno in (errno.EPERM, errno.EINVAL):
+                        # Suppress "Operation not permitted" error, as
+                        # sometimes this function is not executed under pseudo.
+                        # Also ignore "Invalid argument" errors that happen in
+                        # some (unprivileged) container environments (no root).
                         pass
                     else:
                         raise
-- 
2.7.4