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diff: munmap() file contents before running external diff
When running an external diff from, say, a diff tool, it is safe to
assume that we want to write the files in question. On Windows, that
means that there cannot be any other process holding an open handle to
said files.

So let's make sure that `git diff` itself is not holding any open handle
to the files in question.

This fixes #1315

Signed-off-by: Johannes Schindelin <>
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dscho committed Oct 5, 2017
1 parent dc85205 commit 327fab0447484fc8bade0e92a8915b930bb2c166
Showing with 4 additions and 0 deletions.
  1. +4 −0 diff.c
4 diff.c
@@ -3094,6 +3094,10 @@ static void run_external_diff(const char *pgm,
argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);

if (one->should_munmap)
if (two->should_munmap)
if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
die(_("external diff died, stopping at %s"), name);

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