Re: [Buildroot] Remaining issue with Dracut runtime tests

["Yann E. MORIN" <yann.morin.1998@free.fr>]

Thomas, All,

+Thierry, who submitted dracut in the first place,
+Adam, who I know uses dracut

On 2022-11-11 21:53 +0100, Thomas Petazzoni spake thusly:
> Even after your recent Dracut runtime tests fixes there is still one issue:
> 
> ======================================================================
> FAIL: test_run (tests.fs.test_cpio.TestCpioDracutUclibcMergedUsr)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
>   File "/builds/buildroot.org/buildroot/support/testing/tests/fs/test_cpio.py", line 105, in test_run
>     self.check_dracut()
>   File "/builds/buildroot.org/buildroot/support/testing/tests/fs/test_cpio.py", line 60, in check_dracut
>     self.assertNotEqual(out.find("usr/lib/libz.so"), -1)
> AssertionError: -1 == -1
> ----------------------------------------------------------------------
> 
> See:
> 
>   https://gitlab.com/buildroot.org/buildroot/-/jobs/3282261241
>   https://gitlab.com/buildroot.org/buildroot/-/jobs/3282261239
>   https://gitlab.com/buildroot.org/buildroot/-/jobs/3282261236
> 
> Could you have a look?

The error occurs because we can't find usr/lib/libz.so in the list of
files in the cpio archive:

    $ cat -n support/testing/tests/fs/test_cpio.py
    [...]
    60          self.assertNotEqual(out.find("usr/lib/libz.so"), -1)
    [...]

And it is indeed not there (I used the cpio from the pipeline, of course):

    $ cpio --list <rootfs.cpio |grep lib/libz.so
    lib/libz.so
    lib/libz.so.1
    lib/libz.so.1.2.13

So, wtf? Why is libz in /lib when we expect it in /usr/lib?
Especially since this is a merged-usr to begin with!

    $ grep MERGED_USR .config
    BR2_ROOTFS_MERGED_USR=y

Seriously, what?

Now, where did libzlib install its files?

    cp libz.a /builds/buildroot.org/buildroot/test-output/TestCpioDracutGlibcMergedUsr/target/usr/lib
    chmod 644 /builds/buildroot.org/buildroot/test-output/TestCpioDracutGlibcMergedUsr/target/usr/lib/libz.a
    cp libz.so.1.2.13 /builds/buildroot.org/buildroot/test-output/TestCpioDracutGlibcMergedUsr/target/usr/lib
    chmod 755 /builds/buildroot.org/buildroot/test-output/TestCpioDracutGlibcMergedUsr/target/usr/lib/libz.so.1.2.13

Cool, they were installed in /usr/lib...

Thierry, Adam, presumably you would have an idea on how to investigate
further? Why would dracut misplace files?

Oh, and I looked at dracut, and it is really not meant to be installed
out of / (i.e. with --prefix=/) , because it really hard-codes calls to
files in there. For example, host/lib/dracut/modules.d/99base/dracut-lib.sh
has a line like:
    type wait_for_dev >/dev/null 2>&1 || . /lib/dracut/dracut-dev-lib.sh

So, meh... :-(

Final data point: as usual, the tests run OK here: libz is in /usr/lib,
and /lib is a symlink to /usr/lib, exactly as expected.

Regards,
Yann E. MORIN.

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