view tests/helpers-testrepo.sh @ 32980:8dc62c97a665

run-tests: do not prompt changes (-i) if a race condition is detected

The race condition is like:

  1. run-tests.py reads test-a.t as reference output, content A
  2. run-tests.py runs the test (which could be content B, another race
     condition fixed by the next patch, but assume it's content A here)
  3. something changes test-a.t to content C
  4. run-tests.py compares test output (content D) with content A
  5. with "-i", run-tests.py prompts diff(A, D), while the file has content
     C instead of A at this time

This patch detects the above case and tell the user to rerun the test if
they want to apply test changes.

# The test-repo is a live hg repository which may have evolution
# markers created, e.g. when a ~/.hgrc enabled evolution.
#
# Tests are run using a custom HGRCPATH, which do not
# enable evolution markers by default.
#
# If test-repo includes evolution markers, and we do not
# enable evolution markers, hg will occasionally complain
# when it notices them, which disrupts tests resulting in
# sporadic failures.
#
# Since we aren't performing any write operations on the
# test-repo, there's no harm in telling hg that we support
# evolution markers, which is what the following lines
# for the hgrc file do:
cat >> $HGRCPATH << EOF
[experimental]
evolution=createmarkers
EOF