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The `--trust-exit-code` option for git-diff-tool(1) was introduced via2b52123fcf(difftool: add support for --trust-exit-code, 2014-10-26). When set, it makes us return the exit code of the invoked diff tool when diffing multiple files. This patch didn't change the code path where `--dir-diff` was passed because we already returned the exit code of the diff tool unconditionally in that case. This was changed a month later viac41d3fedd8(difftool--helper: add explicit exit statement, 2014-11-20), where an explicit `exit 0` was added to the end of git-difftool--helper.sh. While the stated intent of that commit was merely a cleanup, it had the consequence that we now to ignore the exit code of the diff tool when `--dir-diff` was set. This change in behaviour is thus very likely an unintended side effect of this patch. Now there are two ways to fix this: - We can either restore the original behaviour, which unconditionally returned the exit code of the diffing tool when `--dir-diff` is passed. - Or we can make the `--dir-diff` case respect the `--trust-exit-code` flag. The fact that we have been ignoring exit codes for 7 years by now makes me rather lean towards the latter option. Furthermore, respecting the flag in one case but not the other would needlessly make the user interface more complex. Fix the bug so that we also honor `--trust-exit-code` for dir diffs and adjust the documentation accordingly. Reported-by: Jean-Rémy Falleri <jr.falleri@gmail.com> Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
140 lines
4.5 KiB
Plaintext
140 lines
4.5 KiB
Plaintext
git-difftool(1)
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===============
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NAME
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----
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git-difftool - Show changes using common diff tools
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SYNOPSIS
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--------
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[verse]
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'git difftool' [<options>] [<commit> [<commit>]] [--] [<path>...]
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DESCRIPTION
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-----------
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'git difftool' is a Git command that allows you to compare and edit files
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between revisions using common diff tools. 'git difftool' is a frontend
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to 'git diff' and accepts the same options and arguments. See
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linkgit:git-diff[1].
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OPTIONS
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-------
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-d::
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--dir-diff::
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Copy the modified files to a temporary location and perform
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a directory diff on them. This mode never prompts before
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launching the diff tool.
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-y::
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--no-prompt::
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Do not prompt before launching a diff tool.
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--prompt::
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Prompt before each invocation of the diff tool.
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This is the default behaviour; the option is provided to
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override any configuration settings.
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--rotate-to=<file>::
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Start showing the diff for the given path,
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the paths before it will move to the end and output.
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--skip-to=<file>::
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Start showing the diff for the given path, skipping all
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the paths before it.
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-t <tool>::
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--tool=<tool>::
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Use the diff tool specified by <tool>. Valid values include
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emerge, kompare, meld, and vimdiff. Run `git difftool --tool-help`
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for the list of valid <tool> settings.
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+
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If a diff tool is not specified, 'git difftool'
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will use the configuration variable `diff.tool`. If the
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configuration variable `diff.tool` is not set, 'git difftool'
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will pick a suitable default.
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+
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You can explicitly provide a full path to the tool by setting the
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configuration variable `difftool.<tool>.path`. For example, you
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can configure the absolute path to kdiff3 by setting
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`difftool.kdiff3.path`. Otherwise, 'git difftool' assumes the
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tool is available in PATH.
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+
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Instead of running one of the known diff tools,
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'git difftool' can be customized to run an alternative program
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by specifying the command line to invoke in a configuration
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variable `difftool.<tool>.cmd`.
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+
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When 'git difftool' is invoked with this tool (either through the
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`-t` or `--tool` option or the `diff.tool` configuration variable)
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the configured command line will be invoked with the following
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variables available: `$LOCAL` is set to the name of the temporary
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file containing the contents of the diff pre-image and `$REMOTE`
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is set to the name of the temporary file containing the contents
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of the diff post-image. `$MERGED` is the name of the file which is
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being compared. `$BASE` is provided for compatibility
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with custom merge tool commands and has the same value as `$MERGED`.
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--tool-help::
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Print a list of diff tools that may be used with `--tool`.
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--[no-]symlinks::
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'git difftool''s default behavior is to create symlinks to the
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working tree when run in `--dir-diff` mode and the right-hand
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side of the comparison yields the same content as the file in
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the working tree.
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+
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Specifying `--no-symlinks` instructs 'git difftool' to create copies
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instead. `--no-symlinks` is the default on Windows.
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-x <command>::
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--extcmd=<command>::
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Specify a custom command for viewing diffs.
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'git-difftool' ignores the configured defaults and runs
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`$command $LOCAL $REMOTE` when this option is specified.
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Additionally, `$BASE` is set in the environment.
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-g::
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--[no-]gui::
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When 'git-difftool' is invoked with the `-g` or `--gui` option
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the default diff tool will be read from the configured
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`diff.guitool` variable instead of `diff.tool`. This may be
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selected automatically using the configuration variable
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`difftool.guiDefault`. The `--no-gui` option can be used to
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override these settings. If `diff.guitool` is not set, we will
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fallback in the order of `merge.guitool`, `diff.tool`,
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`merge.tool` until a tool is found.
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--[no-]trust-exit-code::
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Errors reported by the diff tool are ignored by default.
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Use `--trust-exit-code` to make 'git-difftool' exit when an
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invoked diff tool returns a non-zero exit code.
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+
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'git-difftool' will forward the exit code of the invoked tool when
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`--trust-exit-code` is used.
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See linkgit:git-diff[1] for the full list of supported options.
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CONFIGURATION
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-------------
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'git difftool' falls back to 'git mergetool' config variables when the
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difftool equivalents have not been defined.
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include::includes/cmd-config-section-rest.txt[]
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include::config/difftool.txt[]
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SEE ALSO
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--------
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linkgit:git-diff[1]::
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Show changes between commits, commit and working tree, etc
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linkgit:git-mergetool[1]::
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Run merge conflict resolution tools to resolve merge conflicts
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linkgit:git-config[1]::
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Get and set repository or global options
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GIT
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---
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Part of the linkgit:git[1] suite
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