[OE-core] [PATCH 0/1] static IDs bugs and usability

[Patrick Ohly]

In Ostro OS we just started to use useradd-staticids.bbclass. Dynamic
IDs are an error (USERADD_ERROR_DYNAMIC = "error") by default because
warnings probably wouldn't be noticed. I was a bit reluctant to make
this change because Ostro OS is supposed to be customizable, and that
becomes harder when developers also have to define IDs.

But we didn't have a choice because after updating to recent OE-core,
our dynamically assigned IDs started to change randomly between
builds, which (as we learned only because of that change) broke the
swupd update mechanism. Personally I suspect that Python3's
randomization feature is responsible for not getting deterministic
results anymore, but I haven't investigated further.

useradd-staticids.bbclass has a bug which impacts developers when they
edit the table files to fix a warning or error raised by the class:
the cached version of the affected recipe continues to be used and thus
editing the files has no effect. Patch fixing that follows.

There's also a caveat associated with how USERADD_ERROR_DYNAMIC = "error"
is implemented: it marks recipes as "skipped" with an error messages
from useradd-staticids.bbclass. This is not particularly developer-friendly.

For example, when the skipped recipe is deep down in the dependency
chain, then building will fail with rather difficult to understand
"nothing provides..." messages. It does mention eventually that a
recipe was skipped with the right error, so the information is at
least there.

However, it's also possible that a recipe exists in two versions, and
only the one normally picked as default gets skipped. In that case,
the remaining version will get build, i.e. useradd-staticids.bbclass
has the very undesirable effect of silently building something else
than expected instead of aborting the build because of the error.

I've not seen that in practice, though, so I don't know how big of a
problem it is.

The following changes since commit b32d430c3c7dccf3a8d06ab492d648893a05950f:

  dpkg: use snapshot.debian.org for SRC_URI (2016-07-26 08:56:08 +0100)

are available in the git repository at:

  git://github.com/pohly/openembedded-core static-ids
  https://github.com/pohly/openembedded-core/tree/static-ids

Patrick Ohly (1):
  useradd-staticids.bbclass: trigger reparsing when table files change

 meta/classes/useradd-staticids.bbclass | 13 +++++++++++++
 1 file changed, 13 insertions(+)

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2.1.4