Re: Test failures when installing 0install

> I think the problem was that this test was supposed to use
> generic_distribution, but it detected the native MacPorts due to a
> missing check in fake_system.ml. This might fix it:

Doesn't seem to have helped:

info: Getting new selections for http://example.com:8000/Hello.xml
warning: Test failed: Unix.Unix_error(Unix.ENOENT, "mkdir", 
"/private/tmp/0install-test-2f32b7b7/cache/0install.net/injector")
Called from file "support/utils.ml", line 83, characters 6-15
Called from file "support/basedir.ml", line 90, characters 4-36
Called from file "zeroinstall/distro_cache.ml", line 41, characters 21-111
Called from file "camlinternalLazy.ml", line 25, characters 17-27
Re-raised at file "camlinternalLazy.ml", line 32, characters 10-11
Called from file "generic_select.ml", line 181, characters 80-92
Called from file "generic_select.ml", line 260, characters 15-101
Called from file "generic_select.ml", line 293, characters 21-35
Called from file "select.ml", line 16, characters 20-81
Called from file "command_tree.ml", line 16, characters 6-32
Called from file "cli.ml", line 295, characters 14-90
Called from file "support/utils.ml", line 18, characters 8-18
Re-raised at file "support/utils.ml", line 19, characters 39-41
Called from file "support/utils.ml", line 18, characters 8-18
Re-raised at file "support/utils.ml", line 19, characters 39-41
Called from file "tests/fake_system.ml", line 181, characters 6-57
Called from file "tests/test_0install.ml", line 133, characters 17-72
Called from file "support/utils.ml", line 18, characters 8-18
Re-raised at file "support/utils.ml", line 19, characters 39-41
Called from file "support/utils.ml", line 18, characters 8-18
Re-raised at file "support/utils.ml", line 19, characters 39-41
Called from file "src/oUnit.ml", line 86, characters 13-17
Called from file "src/oUnit.ml", line 86, characters 13-17
Called from file "src/oUnit.ml", line 86, characters 13-17
Called from file "tests/test.ml", line 281, characters 4-9

E......................................................................................................................................(showing 
full log)
info: stopping gpg agent
info: Shutting down server...
warning: Test failed: Test tried to spawn process port -v installed
Raised at file "map.ml", line 117, characters 16-25
Called from file "str.ml", line 253, characters 6-29

E..................S...............S......................
==============================================================================
Error: 0install:17:download:27:background-unsolvable

Test tried to spawn process port -v installed
------------------------------------------------------------------------------
==============================================================================
Error: 0install:6:0install:0:select

Unix.Unix_error(Unix.ENOENT, "mkdir", 
"/private/tmp/0install-test-2f32b7b7/cache/0install.net/injector")
------------------------------------------------------------------------------
Ran: 273 tests in: 4.26 seconds.
FAILED: Cases: 273 Tried: 273 Errors: 2 Failures: 0 Skip:  3 Todo: 0 
Timeouts: 0.

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