[Bug 1922712] Re: add metric for new glibc hwcaps

[Sebastien Bacher]

@William, thanks for working on a patch. The project is hosted on
github, is there a chance that you could set up a proper pull request on
https://github.com/ubuntu/ubuntu-report/pulls ? that would make
reviewing and merging easier than having to comment on a non trivial
patch in a comment on launchpad...

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Title:
  add metric for new glibc hwcaps

Status in ubuntu-report package in Ubuntu:
  New

Bug description:
  we want to collect information which most recent hwcap is supported by
  a machine.  The result should be a string like "x86-64-v2",
  "x86-64-v3", "x86-64-v4", "z13", "z14", "p9", "p10" depending on "ld-
  linux --help" output.  The string should be empty for architectures
  without glibc hwcaps (currently armhf, arm64, i386, riscv64). The
  string should be empty if no specific hwcaps is supported (e.g. on a
  power8 machine). The string should be "N/A" (not available), when
  trying to run ld-linux on a release with glibc (<< 2.33).

  Note that lexical sorting won't work for "p9", "p10".

  if test -x /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2; then
    lddynload=/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
  elif test -x /lib/powerpc64le-linux-gnu/ld64.so.2; then
    lddynload=/lib/powerpc64le-linux-gnu/ld64.so.2
  elif test -x /lib/s390x-linux-gnu/ld64.so.1; then
    lddynload=/lib/s390x-linux-gnu/ld64.so.1
  fi

  supported=
  if [ -n "$lddynload" ]; then
    $lddynload --help 2>&1 | awk '/^Subdirectories/,/^$/'
    supported=$($lddynload --help 2>&1 | awk '/^Subdirectories/,/^$/' | awk '/supported/ {print $1}')
  fi

  Here, $supported has listed all supported hwcaps, not just the best
  supported one.

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