Rename TEST_GIT_INDEX_VERSION to GIT_TEST_INDEX_VERSION for consistency with
the other GIT_TEST_ special setups and properly document its use.

Signed-off-by: Ben Peart <ben.pe...@microsoft.com>
---

Notes:
    Base Ref: v2.19.0
    Web-Diff: https://github.com/benpeart/git/commit/e26ccb9004
    Checkout: git fetch https://github.com/benpeart/git 
git-test-index-version-v2 && git checkout e26ccb9004
    
    ### Interdiff (v1..v2):
    
    diff --git a/Makefile b/Makefile
    index 5a969f5830..9e84ef02f7 100644
    --- a/Makefile
    +++ b/Makefile
    @@ -400,7 +400,7 @@ all::
     # (defaults to "man") if you want to have a different default when
     # "git help" is called without a parameter specifying the format.
     #
    -# Define TEST_GIT_INDEX_VERSION to 2, 3 or 4 to run the test suite
    +# Define GIT_TEST_INDEX_VERSION to 2, 3 or 4 to run the test suite
     # with a different indexfile format version.  If it isn't set the index
     # file format used is index-v[23].
     #
    @@ -2599,8 +2599,8 @@ endif
     ifdef GIT_INTEROP_MAKE_OPTS
        @echo GIT_INTEROP_MAKE_OPTS=\''$(subst ','\'',$(subst 
','\'',$(GIT_INTEROP_MAKE_OPTS)))'\' >>$@+
     endif
    -ifdef TEST_GIT_INDEX_VERSION
    -   @echo TEST_GIT_INDEX_VERSION=\''$(subst ','\'',$(subst 
','\'',$(TEST_GIT_INDEX_VERSION)))'\' >>$@+
    +ifdef GIT_TEST_INDEX_VERSION
    +   @echo GIT_TEST_INDEX_VERSION=\''$(subst ','\'',$(subst 
','\'',$(GIT_TEST_INDEX_VERSION)))'\' >>$@+
     endif
        @if cmp $@+ $@ >/dev/null 2>&1; then $(RM) $@+; else mv $@+ $@; fi
    
    diff --git a/read-cache.c b/read-cache.c
    index d140ce9989..7b1354d759 100644
    --- a/read-cache.c
    +++ b/read-cache.c
    @@ -1570,45 +1570,26 @@ static unsigned int get_index_format_default(void)
        char *envversion = getenv("GIT_INDEX_VERSION");
        char *endp;
        int value;
    -   unsigned int version = -1;
    +   unsigned int version = INDEX_FORMAT_DEFAULT;
    
    -   if (envversion) {
    -           version = strtoul(envversion, &endp, 10);
    -           if (*endp ||
    -                   version < INDEX_FORMAT_LB || INDEX_FORMAT_UB < version) 
{
    -                   warning(_("GIT_INDEX_VERSION set, but the value is 
invalid.\n"
    -                           "Using version %i"), INDEX_FORMAT_DEFAULT);
    -                   version = INDEX_FORMAT_DEFAULT;
    -           }
    -   }
    -
    -   if (version == -1) {
    -           if (!git_config_get_int("index.version", &value)) {
    +   if (!envversion) {
    +           if (!git_config_get_int("index.version", &value))
                        version = value;
                if (version < INDEX_FORMAT_LB || INDEX_FORMAT_UB < version) {
                        warning(_("index.version set, but the value is 
invalid.\n"
                                  "Using version %i"), INDEX_FORMAT_DEFAULT);
    -                           version = INDEX_FORMAT_DEFAULT;
    -                   }
    +                   return INDEX_FORMAT_DEFAULT;
                }
    +           return version;
        }
    
    -   if (version == -1) {
    -           envversion = getenv("GIT_TEST_INDEX_VERSION");
    -           if (envversion) {
        version = strtoul(envversion, &endp, 10);
        if (*endp ||
            version < INDEX_FORMAT_LB || INDEX_FORMAT_UB < version) {
    -                           warning(_("GIT_TEST_INDEX_VERSION set, but the 
value is invalid.\n"
    +           warning(_("GIT_INDEX_VERSION set, but the value is invalid.\n"
                          "Using version %i"), INDEX_FORMAT_DEFAULT);
                version = INDEX_FORMAT_DEFAULT;
        }
    -           }
    -   }
    -
    -   if (version == -1)
    -           version = INDEX_FORMAT_DEFAULT;
    -
        return version;
     }
    
    diff --git a/t/README b/t/README
    index f872638a78..fb6359b17b 100644
    --- a/t/README
    +++ b/t/README
    @@ -320,8 +320,7 @@ path where deltas larger than this limit require extra 
memory
     allocation for bookkeeping.
    
     GIT_TEST_INDEX_VERSION=<n> exercises the index read/write code path
    -for the index version specified.  Can be set to any valid version
    -but the non-default version 4 is probably the most beneficial.
    +for the index version specified.  Can be set to any valid version.
    
     Naming Tests
     ------------
    diff --git a/t/test-lib.sh b/t/test-lib.sh
    index 44288cbb59..31698c01c4 100644
    --- a/t/test-lib.sh
    +++ b/t/test-lib.sh
    @@ -134,9 +134,9 @@ export EDITOR
     GIT_TRACE_BARE=1
     export GIT_TRACE_BARE
    
    -if test -n "${TEST_GIT_INDEX_VERSION:+isset}"
    +if test -n "${GIT_TEST_INDEX_VERSION:+isset}"
     then
    -   GIT_INDEX_VERSION="$TEST_GIT_INDEX_VERSION"
    +   GIT_INDEX_VERSION="$GIT_TEST_INDEX_VERSION"
        export GIT_INDEX_VERSION
     fi
    
    ### Patches

 Makefile      | 6 +++---
 t/README      | 5 ++++-
 t/test-lib.sh | 4 ++--
 3 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/Makefile b/Makefile
index 5a969f5830..9e84ef02f7 100644
--- a/Makefile
+++ b/Makefile
@@ -400,7 +400,7 @@ all::
 # (defaults to "man") if you want to have a different default when
 # "git help" is called without a parameter specifying the format.
 #
-# Define TEST_GIT_INDEX_VERSION to 2, 3 or 4 to run the test suite
+# Define GIT_TEST_INDEX_VERSION to 2, 3 or 4 to run the test suite
 # with a different indexfile format version.  If it isn't set the index
 # file format used is index-v[23].
 #
@@ -2599,8 +2599,8 @@ endif
 ifdef GIT_INTEROP_MAKE_OPTS
        @echo GIT_INTEROP_MAKE_OPTS=\''$(subst ','\'',$(subst 
','\'',$(GIT_INTEROP_MAKE_OPTS)))'\' >>$@+
 endif
-ifdef TEST_GIT_INDEX_VERSION
-       @echo TEST_GIT_INDEX_VERSION=\''$(subst ','\'',$(subst 
','\'',$(TEST_GIT_INDEX_VERSION)))'\' >>$@+
+ifdef GIT_TEST_INDEX_VERSION
+       @echo GIT_TEST_INDEX_VERSION=\''$(subst ','\'',$(subst 
','\'',$(GIT_TEST_INDEX_VERSION)))'\' >>$@+
 endif
        @if cmp $@+ $@ >/dev/null 2>&1; then $(RM) $@+; else mv $@+ $@; fi
 
diff --git a/t/README b/t/README
index 9028b47d92..fb6359b17b 100644
--- a/t/README
+++ b/t/README
@@ -315,10 +315,13 @@ packs on demand. This normally only happens when the 
object size is
 over 2GB. This variable forces the code path on any object larger than
 <n> bytes.
 
-GIT_TEST_OE_DELTA_SIZE=<n> exercises the uncomon pack-objects code
+GIT_TEST_OE_DELTA_SIZE=<n> exercises the uncommon pack-objects code
 path where deltas larger than this limit require extra memory
 allocation for bookkeeping.
 
+GIT_TEST_INDEX_VERSION=<n> exercises the index read/write code path
+for the index version specified.  Can be set to any valid version.
+
 Naming Tests
 ------------
 
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 44288cbb59..31698c01c4 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -134,9 +134,9 @@ export EDITOR
 GIT_TRACE_BARE=1
 export GIT_TRACE_BARE
 
-if test -n "${TEST_GIT_INDEX_VERSION:+isset}"
+if test -n "${GIT_TEST_INDEX_VERSION:+isset}"
 then
-       GIT_INDEX_VERSION="$TEST_GIT_INDEX_VERSION"
+       GIT_INDEX_VERSION="$GIT_TEST_INDEX_VERSION"
        export GIT_INDEX_VERSION
 fi
 

base-commit: 1d4361b0f344188ab5eec6dcea01f61a3a3a1670
-- 
2.18.0.windows.1

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