[tor-bugs] #17631 [Chutney]: chutney fails on systems with python2, but no python

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#17631: chutney fails on systems with python2, but no python
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 Reporter:  teor     |          Owner:  nickm
     Type:  defect   |         Status:  needs_revision
 Priority:  Medium   |      Milestone:
Component:  Chutney  |        Version:
 Severity:  Normal   |     Resolution:
 Keywords:           |  Actual Points:
Parent ID:           |         Points:
  Sponsor:           |
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Comment (by cypherpunks):

 I have looked into how Autoconf checks for programs in order to avoid the
 possible issues with `command`.

 Autoconf can check for programs through the
 [http://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/programs.m4?id=5ad3567c3cbd90b4faa6539c35bc4a8c6500f535#n96
 AC_CHECK_PROG] function (which is implemented in
 [http://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/programs.m4?id=5ad3567c3cbd90b4faa6539c35bc4a8c6500f535#n36
 _AC_CHECK_PROG]) which uses
 [http://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/m4sugar/m4sh.m4?id=5ad3567c3cbd90b4faa6539c35bc4a8c6500f535#n1285
 _AS_PATH_WALK] for walking through `PATH` and
 [http://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/m4sugar/m4sh.m4?id=5ad3567c3cbd90b4faa6539c35bc4a8c6500f535#n1053
 AS_EXECUTABLE_P] (which is implemented in
 [http://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/m4sugar/m4sh.m4?id=5ad3567c3cbd90b4faa6539c35bc4a8c6500f535#n1342
 _AS_TEST_PREPARE]) for checking if the file is an executable regular file.

 As these functions do not use `command` i believe this may be the solution
 for checking for Python versions in a portable fashion. If you agree i
 will change the Python detection to use this solution.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17631#comment:6>
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