snap on zesty: nmap fails to import due to bug in dpkg-source

[Nish Aravamudan]

Fix needs to be found for zesty's dpkg-source, but for now, rebuilding snap against artful.

$ git ubuntu import --no-push --no-clean nmap
08/14/2017 15:25:12 - INFO:Ubuntu Server Team importer v1.0-rc5
08/14/2017 15:25:12 - INFO:Using git repository at /tmp/tmp11rgnsm1
08/14/2017 15:26:14 - INFO:Importing patches-unapplied 7.50-1 to debian/buster
08/14/2017 15:26:20 - ERROR:Command exited 255: dpkg-source -x --skip-patches /tmp/tmp11rgnsm1/.git/git-ubuntu-cache/nmap_7.50-1.dsc /tmp/tmp6fku2dpv/x
08/14/2017 15:26:20 - ERROR:stdout:
08/14/2017 15:26:20 - ERROR:stderr: "debarch_is_illegal" is not exported by the Dpkg::Arch module
  Can't continue after import errors at /snap/git-ubuntu/119/usr/bin/dpkg-source line 39.
  BEGIN failed--compilation aborted at /snap/git-ubuntu/119/usr/bin/dpkg-source line 39.
Traceback (most recent call last):
  File "/snap/git-ubuntu/119/gitubuntu/importer.py", line 1119, in import_publishes
    import_func(srcpkg_information)
  File "/snap/git-ubuntu/119/gitubuntu/importer.py", line 789, in import_unapplied_spi
    unapplied_import_tree_hash = self.import_patches_unapplied_tree(spi.dsc_pathname)
  File "/snap/git-ubuntu/119/gitubuntu/importer.py", line 443, in import_patches_unapplied_tree
    import_tree_hash = dsc_to_tree_hash(self.local_repo, dsc_pathname)
  File "/snap/git-ubuntu/119/gitubuntu/importer.py", line 89, in dsc_to_tree_hash
    extracted_dir, # this is <temp_dir>/x
  File "/snap/git-ubuntu/119/gitubuntu/run.py", line 70, in run
    raise e
  File "/snap/git-ubuntu/119/gitubuntu/run.py", line 55, in run
    stdout=stdout, stderr=stderr, stdin=stdin)
  File "/snap/git-ubuntu/119/usr/lib/python3.5/subprocess.py", line 398, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['dpkg-source', '-x', '--skip-patches', '/tmp/tmp11rgnsm1/.git/git-ubuntu-cache/nmap_7.50-1.dsc', '/tmp/tmp6fku2dpv/x']' returned non-zero exit status 255

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/snap/git-ubuntu/119/bin/git-ubuntu", line 18, in <module>
    main()
  File "/snap/git-ubuntu/119/gitubuntu/__main__.py", line 213, in main
    args.func(args)
  File "/snap/git-ubuntu/119/gitubuntu/importer.py", line 1273, in main
    ubuntu_head_versions=ubuntu_head_versions)
  File "/snap/git-ubuntu/119/gitubuntu/importer.py", line 1135, in import_publishes
    raise GitUbuntuImportException(msg) from e
gitubuntu.importer.GitUbuntuImportException: Unable to import patches-unapplied 7.50-1 to debian
08/14/2017 15:26:20 - INFO:Leaving /tmp/tmp11rgnsm1 as directed