Teach difftool to exit when a diff tool returns a non-zero exit
code when either --trust-exit-code is specified or
difftool.trustExitCode is true.
Forward exit codes from invoked diff tools to the caller when
--trust-exit-code is used.
Suggested-by: Adri Farr <14farr...@gmail.com>
Signed-off-by: David Aguilar <dav...@gmail.com>
---
Documentation/git-difftool.txt | 14 ++++++++++++++
git-difftool--helper.sh | 7 +++++++
git-difftool.perl | 12 ++++++++++++
t/t7800-difftool.sh | 43 ++++++++++++++++++++++++++++++++++++++++++
4 files changed, 76 insertions(+)
diff --git a/Documentation/git-difftool.txt b/Documentation/git-difftool.txt
index 11887e6..dc843d3 100644
--- a/Documentation/git-difftool.txt
+++ b/Documentation/git-difftool.txt
@@ -91,6 +91,15 @@ instead. `--no-symlinks` is the default on Windows.
the default diff tool will be read from the configured
`diff.guitool` variable instead of `diff.tool`.
+--[no-]trust-exit-code::
+ 'git-difftool' invokes a diff tool individually on each file.
+ Errors reported by the diff tool are ignored by default.
+ Use `--trust-exit-code` to make 'git-difftool' exit when an an
+ invoked diff tool returns a non-zero exit code.
++
+'git-difftool' will forward the exit code of the invoked tool when
+'--trust-exit-code' is used.
+
See linkgit:git-diff[1] for the full list of supported options.
CONFIG VARIABLES
@@ -116,6 +125,11 @@ See the `--tool=<tool>` option above for more details.
difftool.prompt::
Prompt before each invocation of the diff tool.
+difftool.trustExitCode::
+ Exit difftool if the invoked diff tool returns a non-zero exit status.
++
+See the `--trust-exit-code` option above for more details.
+
SEE ALSO
--------
linkgit:git-diff[1]::
diff --git a/git-difftool--helper.sh b/git-difftool--helper.sh
index 7ef36b9..fdbd768 100755
--- a/git-difftool--helper.sh
+++ b/git-difftool--helper.sh
@@ -62,6 +62,8 @@ launch_merge_tool () {
else
run_merge_tool "$merge_tool"
fi
+ status=$?
+ return $status
}
if ! use_ext_cmd
@@ -85,5 +87,10 @@ else
do
launch_merge_tool "$1" "$2" "$5"
shift 7
+ if test "$status" != 0 &&
+ test "$GIT_DIFFTOOL_TRUST_EXIT_CODE" = true
+ then
+ exit $status
+ fi
done
fi
diff --git a/git-difftool.perl b/git-difftool.perl
index 598fcc2..7df7c8a 100755
--- a/git-difftool.perl
+++ b/git-difftool.perl
@@ -342,6 +342,7 @@ sub main
symlinks => $^O ne 'cygwin' &&
$^O ne 'MSWin32' && $^O ne 'msys',
tool_help => undef,
+ trust_exit_code => undef,
);
GetOptions('g|gui!' => \$opts{gui},
'd|dir-diff' => \$opts{dirdiff},
@@ -352,6 +353,8 @@ sub main
'no-symlinks' => sub { $opts{symlinks} = 0; },
't|tool:s' => \$opts{difftool_cmd},
'tool-help' => \$opts{tool_help},
+ 'trust-exit-code' => \$opts{trust_exit_code},
+ 'no-trust-exit-code' => sub { $opts{trust_exit_code} = 0; },
'x|extcmd:s' => \$opts{extcmd});
if (defined($opts{help})) {
@@ -383,6 +386,15 @@ sub main
}
}
+ if (!defined $opts{trust_exit_code}) {
+ $opts{trust_exit_code} =
Git::config_bool('difftool.trustExitCode');
+ }
+ if ($opts{trust_exit_code}) {
+ $ENV{GIT_DIFFTOOL_TRUST_EXIT_CODE} = 'true';
+ } else {
+ $ENV{GIT_DIFFTOOL_TRUST_EXIT_CODE} = 'false';
+ }
+
# In directory diff mode, 'git-difftool--helper' is called once
# to compare the a/b directories. In file diff mode, 'git diff'
# will invoke a separate instance of 'git-difftool--helper' for
diff --git a/t/t7800-difftool.sh b/t/t7800-difftool.sh
index dc30a51..2b89b7b 100755
--- a/t/t7800-difftool.sh
+++ b/t/t7800-difftool.sh
@@ -76,6 +76,49 @@ test_expect_success PERL 'difftool forwards arguments to
diff' '
rm for-diff
'
+test_expect_success PERL 'difftool ignores exit code' '
+ test_config difftool.error.cmd false &&
+ git difftool -y -t error branch
+'
+
+test_expect_success PERL 'difftool forwards exit code with --trust-exit-code' '
+ test_config difftool.error.cmd false &&
+ test_must_fail git difftool -y --trust-exit-code -t error branch
+'
+
+test_expect_success PERL 'difftool honors difftool.trustExitCode = true' '
+ test_config difftool.error.cmd false &&
+ test_config difftool.trustExitCode true &&
+ test_must_fail git difftool -y -t error branch
+'
+
+test_expect_success PERL 'difftool honors difftool.trustExitCode = false' '
+ test_config difftool.error.cmd false &&
+ test_config difftool.trustExitCode false &&
+ git difftool -y -t error branch
+'
+
+test_expect_success PERL 'difftool ignores exit code with
--no-trust-exit-code' '
+ test_config difftool.error.cmd false &&
+ test_config difftool.trustExitCode true &&
+ git difftool -y --no-trust-exit-code -t error branch
+'
+
+write_script fail-right-file <<\EOF
+echo "$2"
+exit 1
+EOF
+
+test_expect_success PERL 'difftool stops on error with --trust-exit-code' '
+ >for-diff &&
+ git add for-diff &&
+ echo branch >actual &&
+ test_must_fail git difftool -y --trust-exit-code \
+ --extcmd "$(pwd)/fail-right-file" branch >actual &&
+ test_cmp expect actual &&
+ rm -f for-diff fail-right-file
+'
+
test_expect_success PERL 'difftool honors --gui' '
difftool_test_setup &&
test_config merge.tool bogus-tool &&
--
2.1.2.556.g2136b5c
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