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difftool: fix bug when printing usage

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"git difftool -h" reports an error:

	fatal: BUG: setup_git_env called without repository

Defer repository setup so that the help option processing happens before
the repository is initialized.

Add tests to ensure that the basic usage works inside and outside of a
repository.

Signed-off-by: David Aguilar <davvid@gmail.com>
Acked-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
David Aguilar 2017-02-05 13:23:38 -08:00 committed by Junio C Hamano
parent 94d3997ecc
commit d81345ce09
2 changed files with 17 additions and 4 deletions
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8
builtin/difftool.c
View file

@ -647,10 +647,6 @@ int cmd_difftool(int argc, const char **argv, const char *prefix)
OPT_END()
};
/* NEEDSWORK: once we no longer spawn anything, remove this */
setenv(GIT_DIR_ENVIRONMENT, absolute_path(get_git_dir()), 1);
setenv(GIT_WORK_TREE_ENVIRONMENT, absolute_path(get_git_work_tree()), 1);
git_config(difftool_config, NULL);
symlinks = has_symlinks;
@ -661,6 +657,10 @@ int cmd_difftool(int argc, const char **argv, const char *prefix)
if (tool_help)
return print_tool_help();
/* NEEDSWORK: once we no longer spawn anything, remove this */
setenv(GIT_DIR_ENVIRONMENT, absolute_path(get_git_dir()), 1);
setenv(GIT_WORK_TREE_ENVIRONMENT, absolute_path(get_git_work_tree()), 1);
if (use_gui_tool && diff_gui_tool && *diff_gui_tool)
setenv("GIT_DIFF_TOOL", diff_gui_tool, 1);
else if (difftool_cmd) {

13
t/t7800-difftool.sh
View file

@ -23,6 +23,19 @@ prompt_given ()
test "$prompt" = "Launch 'test-tool' [Y/n]? branch"
}
test_expect_success 'basic usage requires no repo' '
lines=$(git difftool -h | grep ^usage: | wc -l) &&
test "$lines" -eq 1 &&
# create a ceiling directory to prevent Git from finding a repo
mkdir -p not/repo &&
ceiling="$PWD/not" &&
lines=$(cd not/repo &&
GIT_CEILING_DIRECTORIES="$ceiling" git difftool -h |
grep ^usage: | wc -l) &&
test "$lines" -eq 1 &&
rmdir -p not/repo
'
# Create a file on master and change it on branch
test_expect_success 'setup' '
echo master >file &&