[PATCH 0/1] Exit bootstrap with error if apt-get update fails

[Uladzimir Bely <ubely@ilbers.de>]

Sometimes we have issues with `deb.debian.org` availability. Usually, it
results in errors in the related tasks that are understandable, e.g.,
`Could not connect to deb.debian.org:80` and so on.

But if the issue happens while debootstrapping at the `apt-get update`
stage, it doesn't produce an error and the following tasks fail instead
with a pretty weird reason (no any errors in the nearest context).

For example, we can get errors in buildchroot-target:

```
E: Package 'make' has no installation candidate
E: Unable to locate package debhelper
...
```
The reason is that `actual` error happened in `bootstrap` task, but it
didn't fail with error code.

Adding `-o APT::Update::Error-Mode=any` (this is an apt configuration
equivalent of `--error-on=any` option) makes apt fail in such cases
during the debootstrapping.

Unfortunatelly, proposed solution doesn't work for `stretch` and
`buster` while they have older apt versions.

Technically, it's possible support these legacy distros, but it will
require ugly workarounds with redirecting apt-get output, parcing
it for `^W` messages (warnings) and generating artificial errors. It
doesn't looks like something that is worth implementing.

Uladzimir Bely (1):
  Exit bootstrap with error if apt-get update fails

 meta/recipes-core/isar-bootstrap/isar-bootstrap.inc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

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2.20.1