Re: [PATCH v2 02/12] tests/docker: better handle symlinked libs

["Alex Bennée" <alex.bennee@linaro.org>]

Philippe Mathieu-Daudé <philmd@redhat.com> writes:

> On 1/30/20 12:32 PM, Alex Bennée wrote:
>> When we are copying we want to ensure we grab the first
>> resolution (the found in path section). However even that binary might
>> be a symlink so lets make sure we chase the symlinks to copy the right
>> binary to where it can be found.
>> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
>> ---
>>   tests/docker/docker.py | 5 +++--
>>   1 file changed, 3 insertions(+), 2 deletions(-)
>> diff --git a/tests/docker/docker.py b/tests/docker/docker.py
>> index 31d8adf836..7dfca63fe4 100755
>> --- a/tests/docker/docker.py
>> +++ b/tests/docker/docker.py
>> @@ -109,7 +109,7 @@ def _get_so_libs(executable):
>>       ensure theright data is copied."""
>>         libs = []
>> -    ldd_re = re.compile(r"(/.*/)(\S*)")
>> +    ldd_re = re.compile(r"(?:\S+ => )?(\S*) \(:?0x[0-9a-f]+\)")
>>       try:
>>           ldd_output = subprocess.check_output(["ldd", executable]).decode('utf-8')
>>           for line in ldd_output.split("\n"):
>> @@ -145,7 +145,8 @@ def _copy_binary_with_libs(src, bin_dest, dest_dir):
>>       if libs:
>>           for l in libs:
>>               so_path = os.path.dirname(l)
>> -            _copy_with_mkdir(l, dest_dir, so_path)
>> +            real_l = os.path.realpath(l)
>> +            _copy_with_mkdir(real_l, dest_dir, so_path)
>>     
>>   def _check_binfmt_misc(executable):
>> 
>
> Rob raised an issue in this patch, it appears in a separated thread:
> https://www.mail-archive.com/qemu-devel@nongnu.org/msg675307.html

If fixed it up thusly:

def _get_so_libs(executable):
    """Return a list of libraries associated with an executable.

    The paths may be symbolic links which would need to be resolved to
    ensure the right data is copied."""

    libs = []
    ldd_re = re.compile(r"(?:\S+ => )?(\S*) \(:?0x[0-9a-f]+\)")
    try:
        ldd_output = subprocess.check_output(["ldd", executable]).decode('utf-8')
        for line in ldd_output.split("\n"):
            search = ldd_re.search(line)
            if search:
                try:
                    libs.append(s.group(1))
                except IndexError:
                    pass
    except subprocess.CalledProcessError:
        print("%s had no associated libraries (static build?)" % (executable))

    return libs


-- 
Alex Bennée