Re: [PATCH 3/3] read-cache: don't write index twice if we can't write shared index

> Subject: [PATCH] travis-ci: include the trash directories of failed tests in
>  the trace log
>
> The trash directory of a failed test might contain valuable
> information about the cause of the failure, but we have no access to
> the trash directories of Travis CI build jobs.  The only feedback we
> get from there is the trace log, so...
>
> Modify 'ci/print-test-failures.sh' to create a tar.gz archive of the
> test directory of each failed test and encode it with base64, so the
> result is a block of ASCII text that can be safely included in the
> trace log, along with a hint about how to restore it.  Furthermore,
> run tests with '--immediate' to faithfully preserve the failed state.
>
> A few of our tests create a sizeable trash directory, so limit the
> size of each included base64-encoded block, let's say, to 1MB.
>
> Note:
>
>   - The logs of Linux build jobs coming from Travis CI have mostly
>     CRLF line endings, which makes 'base64 -d' from 'coreutils'
>     complain about "invalid input"; it has to be converted to LF
>     first.  'openssl base64 -d' can grok it just fine, even without
>     conversion.
>
>   - The logs of OSX build jobs have CRCRLF line endings.  However, the
>     'base64' util of OSX doesn't wrap its output at 76 columns, i.e.
>     prints one single albeit very long line.  This means that while

>     'base64' from 'coreutils' still complains, by the time it gets to
>     the invalid input it already decoded everything and produced a
>     valid .tar.gz.  OTOH, 'openssl base64 -d' doesn't grok it, but
>     exits without any error message or even an error code, even after
>     converting to CRLF or LF line endings.
>
>     Go figure.
>
> Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>