[PATCH 00/10] Hash-independent tests (part 1)

This is a series to make our tests hash-independent. Many tests have hard-coded SHA-1 values in them, and it would be valuable to express these items in a hash-independent way for our hash transitions.

The approach in this series relies on only three components for hash independence: git rev-parse, git hash-object, and EMPTY_BLOB and EMPTY_TREE. Because many of our shell scripts and test components already rely on the first two, this seems like a safe assumption.

For the same reason, this series avoids modifying tests that test these components or their expected SHA-1 values. I expect that when we add another hash function, we'll copy these tests to expose both SHA-1 and NewHash versions.

Many of our tests use heredocs for defining expected values. My approach has been to interpolate values into the heredocs, as that produces the best readability in my view.

These tests have been tested using my "short BLAKE2b" series (branch blake2b-test-hash) and have also been tested based off master.

Comments on any aspect of this series are welcome, but opinions on the approach or style are especially so.

brian m. carlson (10):
  t1011: abstract away SHA-1-specific constants
  t1304: abstract away SHA-1-specific constants
  t1300: abstract away SHA-1-specific constants
  t1405: sort reflog entries in a hash-independent way
  t1411: abstract away SHA-1-specific constants
  t1507: abstract away SHA-1-specific constants
  t2020: abstract away SHA-1 specific constants
  t2101: modernize test style
  t2101: abstract away SHA-1-specific constants
  t2107: abstract away SHA-1-specific constants

 t/t1011-read-tree-sparse-checkout.sh |  7 ++-
 t/t1300-repo-config.sh               |  6 +-
 t/t1304-default-acl.sh               |  2 +-
 t/t1405-main-ref-store.sh            |  4 +-
 t/t1411-reflog-show.sh               | 21 ++++---
 t/t1507-rev-parse-upstream.sh        |  5 +-
 t/t2020-checkout-detach.sh           | 40 +++++++-----
 t/t2101-update-index-reupdate.sh     | 91 +++++++++++++++-------------
 t/t2107-update-index-basic.sh        |  6 +-
 9 files changed, 100 insertions(+), 82 deletions(-)