[U-Boot] [PATCH] test/py: Set cache_dir to /tmp/.pytest_cache

[Tom Rini]

For some time now, pytest has supported setting where a cache directory
that it will use is located (and in turn has logic to re-use this cache
and speed things up when possible).  When running the pytest tests on
Azure Pipelines, our source directory is read-only and we now see a
warning about being unable to create the .pytest_cache directory as the
default is in the same place as pytest.ini.  Set cache_dir to
/tmp/.pytest_cache so that it will always be placed in a read/write
location.

Cc: Stephen Warren <swarren at nvidia.com>
Cc: Simon Glass <sjg at chromium.org>
Cc: Bin Meng <bmeng.cn at gmail.com>
Signed-off-by: Tom Rini <trini at konsulko.com>
---
Looking at
https://docs.pytest.org/en/latest/customize.html#confval-cache_dir we
could use an environment variable but TMP/TMPDIR/etc aren't always going
to be set and that in turn leads to test/py/$TMPDIR/.pytest_cache being
used.  I think hard-coding to /tmp here ends up being less problematic
but I am open to suggestions.  We could even just ignore the warning, I
only spotted it when seeing why a test had otherwise failed.
---
 test/py/pytest.ini | 1 +
 1 file changed, 1 insertion(+)

diff --git a/test/py/pytest.ini b/test/py/pytest.ini
index e93d010f1fa2..56c1f0521a54 100644
--- a/test/py/pytest.ini
+++ b/test/py/pytest.ini
@@ -11,3 +11,4 @@ markers =
     notbuildconfigspec: U-Boot: Describes required disabled Kconfig options.
     requiredtool: U-Boot: Required host tools for a test.
     slow: U-Boot: Specific test will run slowly.
+cache_dir = /tmp/.pytest_cache
-- 
2.17.1