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@@ -644,6 +644,16 @@ parameter, <path>.
For each path `GIT_EXTERNAL_DIFF` is called, two environment variables,
`GIT_DIFF_PATH_COUNTER` and `GIT_DIFF_PATH_TOTAL` are set.
+`GIT_EXTERNAL_DIFF_TRUST_EXIT_CODE`::
+ If this Boolean environment variable is set to true then the
+ `GIT_EXTERNAL_DIFF` command is expected to return exit code
+ 0 if it considers the input files to be equal or 1 if it
+ considers them to be different, like `diff(1)`.
+ If it is set to false, which is the default, then the command
+ is expected to return exit code 0 regardless of equality.
+ Any other exit code causes Git to report a fatal error.
+
+
`GIT_DIFF_PATH_COUNTER`::
A 1-based counter incremented by one for every path.