[Bug 1762709] Re: Unable to fetch git repos via python subprocess with proxy configured git 2.17.0-1ubuntu1

[Po-Hsu Lin]

More tests:
  1. PASS - proxy configured with export, git clone with python
  2. FAIL - proxy configures with python, git clone with python

And I think I have found the cause:
The https_proxy should be using the proxy server with http, not https.

Not sure why this works with older git version (and why it works with
proxy configured in shell), maybe the check was not that strict?

Anyway, I will prepare the fix for the SRU testing infrastructure.

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Title:
  Unable to fetch git repos via python subprocess with proxy configured
  git 2.17.0-1ubuntu1

Status in git package in Ubuntu:
  New
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  All the tests that need to fetch a git repo for testing failed with error message like:
      CmdError: Command <git clone https://github.com/tytso/xfstests-bld> failed, rc=128, Command returned non-zero exit status
      * Command:
          git clone https://github.com/tytso/xfstests-bld
      Exit status: 128
      Duration: 0.254368066788

      stderr:
      Cloning into 'xfstests-bld'...
      fatal: unable to access 'https://github.com/tytso/xfstests-bld/': gnutls_handshake() failed: An unexpected TLS packet was received.

  Step to reproduce:
    1. Deploy a Bionic system and install the python-minimal package
    2. Run the following python code:
   import subprocess
   import os

   proxysets = [{'addr': 'squid.internal', 'desc': 'Running in the Canonical CI environment'},
                {'addr': '91.189.89.216', 'desc': 'Running in the Canonical enablement environment'},
                {'addr': '10.245.64.1', 'desc': 'Running in the Canonical enablement environment'}]
  for proxy in proxysets:
          cmd = ['nc', '-w' ,'2', proxy['addr'], '3128']
          try:
              subprocess.check_call(cmd)
              print proxy['desc']
              os.environ['https_proxy'] = 'https://' + proxy['addr'] + ':3128'
              break
          except:
              pass

   subprocess.check_call(['git', 'clone', 'https://github.com/tytso/xfstests-bld'])
     4. Update the git package from 2.15.1-1ubuntu2 to 2.17.0-1ubuntu1
     5. Remove the xfstests-bld dir and try step 3 again

  Result:
    * Step 1 - 3 with git 2.15.1 will work, but you will see the error message with git updated to 2.17.0 (this code works without proxy configured)

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-15-generic 4.15.0-15.16
  ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15
  Uname: Linux 4.15.0-15-generic s390x
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access '/dev/snd/': No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.9-0ubuntu4
  Architecture: s390x
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  CurrentDmesg:

  Date: Tue Apr 10 11:35:24 2018
  HibernationDevice: RESUME=UUID=e2735dd1-cbbc-4424-9c25-d37d073d9414
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  PciMultimedia:

  ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
  ProcKernelCmdLine: root=UUID=38f7d570-2973-4055-b668-12a9ace1e0c7 crashkernel=196M BOOT_IMAGE=0
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-15-generic N/A
   linux-backports-modules-4.15.0-15-generic  N/A
   linux-firmware                             1.173
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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