pgsql: In the pg_upgrade test suite, don't write to src/test/regress.

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pgsql: In the pg_upgrade test suite, don't write to src/test/regress.

Noah Misch-2
In the pg_upgrade test suite, don't write to src/test/regress.

When this suite runs installcheck, redirect file creations from
src/test/regress to src/bin/pg_upgrade/tmp_check/regress.  This closes a
race condition in "make -j check-world".  If the pg_upgrade suite wrote
to a given src/test/regress/results file in parallel with the regular
src/test/regress invocation writing it, a test failed spuriously.  Even
without parallelism, in "make -k check-world", the suite finishing
second overwrote the other's regression.diffs.  This revealed test
"largeobject" assuming @abs_builddir@ is getcwd(), so fix that, too.

Buildfarm client REL_10, released forty-five days ago, supports saving
regression.diffs from its new location.  When an older client reports a
pg_upgradeCheck failure, it will no longer include regression.diffs.
Back-patch to 9.5, where pg_upgrade moved to src/bin.

Reviewed by Andrew Dunstan.

Discussion: https://postgr.es/m/20181224034411.GA3224776@...

Branch
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REL9_5_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/e00b5f090fa04656dd1929786720f500741efbac

Modified Files
--------------
src/bin/pg_upgrade/test.sh                   | 12 ++++++++++++
src/test/regress/input/largeobject.source    |  6 +++---
src/test/regress/output/largeobject.source   |  6 +++---
src/test/regress/output/largeobject_1.source |  6 +++---
src/tools/msvc/vcregress.pl                  | 18 +++++++++++++++++-
5 files changed, 38 insertions(+), 10 deletions(-)