From 1a8630dc3b1cc6f1361a4e5d94630133c24c97d9 Mon Sep 17 00:00:00 2001 From: Lars Schneider Date: Fri, 29 Jan 2016 09:21:37 +0100 Subject: [PATCH] convert: treat an empty string for clean/smudge filters as "cat" Once a lower-priority configuration file defines a clean or smudge filter, there is no convenient way to override it to produce as-is output. Even though the configuration mechanism implements "the last one wins" semantics, you cannot set them to an empty string and expect them to work, as apply_filter() would try to run the empty string as an external command and fail. The conversion is not done, but the function would still report a failure to convert. Even though resetting the variable to "cat" (i.e. pass the data back as-is and report success) is an obvious and a viable way to solve this, it is wasteful to spawn an external process just as a workaround. Instead, teach apply_filter() to treat an empty string as a no-op filter that always returns successfully its input as-is without conversion. Signed-off-by: Lars Schneider Signed-off-by: Junio C Hamano --- convert.c | 2 +- t/t0021-conversion.sh | 16 ++++++++++++++++ 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/convert.c b/convert.c index 814e814438..02d5f1e23c 100644 --- a/convert.c +++ b/convert.c @@ -395,7 +395,7 @@ static int apply_filter(const char *path, const char *src, size_t len, int fd, struct async async; struct filter_params params; - if (!cmd) + if (!cmd || !*cmd) return 0; if (!dst) diff --git a/t/t0021-conversion.sh b/t/t0021-conversion.sh index 718efa04d3..7bac2bcf26 100755 --- a/t/t0021-conversion.sh +++ b/t/t0021-conversion.sh @@ -252,4 +252,20 @@ test_expect_success "filter: smudge empty file" ' test_cmp expected filtered-empty-in-repo ' +test_expect_success 'disable filter with empty override' ' + test_config_global filter.disable.smudge false && + test_config_global filter.disable.clean false && + test_config filter.disable.smudge false && + test_config filter.disable.clean false && + + echo "*.disable filter=disable" >.gitattributes && + + echo test >test.disable && + git -c filter.disable.clean= add test.disable 2>err && + test_must_be_empty err && + rm -f test.disable && + git -c filter.disable.smudge= checkout -- test.disable 2>err && + test_must_be_empty err +' + test_done