since index-v5 didn't seem to generate enough interest to be merged, I
have a few patches that give users users easier access to index-v4.
Until now users have to go into the source code and compile git
themselves to use index-v4 by default, or use git-update-index to
change the index file to the new version.

With this patches it's possible to set the default index file format
either in gitconfig or in an environment variable.  It also simplifies
testing index-v4 by adding a Makefile knob to use it for running the
test suite.  For safety, existing repositories are not changed when
the environment or the config variables are set.

I'm not sure about the precedence in patch 3, right now the environment
variable has precedence, but it should be easy to give the config
option precedence over that.

Thomas Gummerer (3):
introduce GIT_INDEX_VERSION environment variable
test-lib: allow setting the index format version
read-cache: add index.version config variable

Documentation/config.txt              |  4 +++
Documentation/git.txt                 |  5 ++++
Makefile                              |  7 +++++
read-cache.c                          | 36 +++++++++++++++++++++++-
t/t1600-index.sh                      | 52 +++++++++++++++++++++++++++++++++++
t/t2104-update-index-skip-worktree.sh |  2 ++
t/test-lib-functions.sh               |  5 ++++
t/test-lib.sh                         |  3 ++
8 files changed, 113 insertions(+), 1 deletion(-)
create mode 100755 t/t1600-index.sh


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