[PATCH 2/3] Windows: a test_cmp that is agnostic to random LF <> CRLF conversions
- From
Johannes Sixt <j6t@kdbg.org>
- Date
- Oct 26, 2013, 19:17 UTC
- Message-ID
- <e64878fec3f026802e8d3958a1e6213428cab778.1382814437.git.j6t@kdbg.org>
- In-Reply-To
- <cover.1382814437.git.j6t@kdbg.org>
In a number of tests, output that was produced by a shell script is compared to expected output using test_cmp. Unfortunately, the MSYS bash-- when invoked via git, such as in hooks--converts LF to CRLF on output (as produced by echo and printf), which leads to many false positives.
Implements a diff tool that undoes the converted CRLF. To avoid that sub-processes are spawned (which is very slow on Windows), the tool is implemented as a shell function. Diff is invoked as usual only when a difference is detected by the shell code.
Signed-off-by: Johannes Sixt <j6t@kdbg.org> --- t/test-lib-functions.sh | 66 +++++++++++++++++++++++++++++++++++++++++++++++++ t/test-lib.sh | 1 + 2 files changed, 67 insertions(+)
diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh index a7e9aac..f987694 100644 --- a/t/test-lib-functions.sh +++ b/t/test-lib-functions.sh @@ -710,3 +710,69 @@ test_ln_s_add () { git update-index --add --cacheinfo 120000 $ln_s_obj "$2" fi } + +# The following mingw_* functions obey POSIX shell syntax, but are actually +# bash scripts, and are meant to be used only with bash on Windows. + +# A test_cmp function that treats LF and CRLF equal and avoids to fork +# diff when possible. +mingw_test_cmp () { + # Read text into shell variables and compare them. If the results + # are different, use regular diff to report the difference. + local test_cmp_a= test_cmp_b= + + # When text came from stdin (one argument is '-') we must feed it + # to diff. + local stdin_for_diff= + + # Since it is difficult to detect the difference between an + # empty input file and a failure to read the files, we go straight + # to diff if one of the inputs is empty. + if test -s "$1" && test -s "$2" + then + # regular case: both files non-empty + mingw_read_file_strip_cr_ test_cmp_a <"$1" + mingw_read_file_strip_cr_ test_cmp_b <"$2" + elif test -s "$1" && test "$2" = - + then + # read 2nd file from stdin + mingw_read_file_strip_cr_ test_cmp_a <"$1" + mingw_read_file_strip_cr_ test_cmp_b + stdin_for_diff='<<<"$test_cmp_b"' + elif test "$1" = - && test -s "$2" + then + # read 1st file from stdin + mingw_read_file_strip_cr_ test_cmp_a + mingw_read_file_strip_cr_ test_cmp_b <"$2" + stdin_for_diff='<<<"$test_cmp_a"' + fi + test -n "$test_cmp_a" && + test -n "$test_cmp_b" && + test "$test_cmp_a" = "$test_cmp_b" || + eval "diff -u \"\$@\" $stdin_for_diff" +} + +# $1 is the name of the shell variable to fill in +mingw_read_file_strip_cr_ () { + # Read line-wise using LF as the line separator + # and use IFS to strip CR. + local line + while : + do + if IFS=$'\r' read -r -d $'\n' line + then + # good + line=$line$'\n' + else + # we get here at EOF, but also if the last line + # was not terminated by LF; in the latter case, + # some text was read + if test -z "$line" + then + # EOF, really + break + fi + fi + eval "$1=\$$1\$line" + done +} diff --git a/t/test-lib.sh b/t/test-lib.sh index 0fa7dfd..77e487b 100644 --- a/t/test-lib.sh +++ b/t/test-lib.sh @@ -817,6 +817,7 @@ case $(uname -s) in test_set_prereq NOT_CYGWIN test_set_prereq SED_STRIPS_CR test_set_prereq GREP_STRIPS_CR + GIT_TEST_CMP=mingw_test_cmp ;; *CYGWIN*) test_set_prereq POSIXPERM
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