This commit changes the way `os.Stderr` is mocked so that higher
level consumes of the libary can use helpers can replace os.Stderr
(like `testutil.CaptureStdio()` is doing). The existing approach
assigns the "real" os.Stderr to osStderr so early that it cannot
be changed later.
This commit fixes a silly mistake from PR#810. The issue is that
in #810 we started to collect the osbuild stdout/stderr so that
we can show crashes from osbuild or other unexpected output.
However when a stage fails this is reported via the json progress
and not directly on stdout/stderr - this was missed when #810
was done.
This commit does a short term fix by collecting the buildlog again
and showing it in the error and also updates the test to be more
realistic. However we really need a test that actually tests
the real behavior, ideally a real osbuild run with a stage error
so that we can be sure we capture this (criticial!) functionality.
This commit tweaks an issue that potentially an incorrect status
from osbuild would fail the build with a bad error message and
without us getting the full buildlog.
This commit adds catpure of os.Std{out,err} when running osbuild so
that we capture the error log and can display it as part of
an error from osbuild, e.g. when osbuild itself crashes.
This gives us more accurate error reporting if anything fails
during the osbuild building.
This commit makes the previously internal `progress` package an
external API. The is the result of the discussion in images
PR#1150 where we decided that the progress module is not a great
fit for the "images" library.
We want to share this code between bootc-image-builder and
image-builder-cli now. In the future we will also want to
use it in the `worker-executor` in `osbuild-composer` to
parse the stream data from `osbuild`.
We plan to merge bootc-image-builder and image-builder-cli
medium term so importing code from bootc-image-buider in
image-builder cli is not that stange.
When we (longer-term) use this code the `worker-executor`
we will need to think about this again and maybe put it
back into images. However this commit unblocks us without
making anything worse.
