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git/t/t0007-git-var.sh
Johannes Schindelin 256a94ef6c var: avoid a segmentation fault when HOME is unset
The code introduced in 576a37fccbf (var: add attributes files locations,
2023-06-27) paid careful attention to use `xstrdup()` for pointers known
never to be `NULL`, and `xstrdup_or_null()` otherwise.

One spot was missed, though: `git_attr_global_file()` can return `NULL`,
when the `HOME` variable is not set (and neither `XDG_CONFIG_HOME`), a
scenario not too uncommon in certain server scenarios.

Fix this, and add a test case to avoid future regressions.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Acked-by: brian m. carlson <bk2204@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-09-05 15:28:26 -07:00

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#!/bin/sh
test_description='basic sanity checks for git var'
TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
sane_unset_all_editors () {
sane_unset GIT_EDITOR &&
sane_unset VISUAL &&
sane_unset EDITOR
}
test_expect_success 'get GIT_AUTHOR_IDENT' '
test_tick &&
echo "$GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL> $GIT_AUTHOR_DATE" >expect &&
git var GIT_AUTHOR_IDENT >actual &&
test_cmp expect actual
'
test_expect_success 'get GIT_COMMITTER_IDENT' '
test_tick &&
echo "$GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE" >expect &&
git var GIT_COMMITTER_IDENT >actual &&
test_cmp expect actual
'
test_expect_success !FAIL_PREREQS,!AUTOIDENT 'requested identities are strict' '
(
sane_unset GIT_COMMITTER_NAME &&
sane_unset GIT_COMMITTER_EMAIL &&
test_must_fail git var GIT_COMMITTER_IDENT
)
'
test_expect_success 'get GIT_DEFAULT_BRANCH without configuration' '
(
sane_unset GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME &&
git init defbranch &&
git -C defbranch symbolic-ref --short HEAD >expect &&
git var GIT_DEFAULT_BRANCH >actual &&
test_cmp expect actual
)
'
test_expect_success 'get GIT_DEFAULT_BRANCH with configuration' '
test_config init.defaultbranch foo &&
(
sane_unset GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME &&
echo foo >expect &&
git var GIT_DEFAULT_BRANCH >actual &&
test_cmp expect actual
)
'
test_expect_success 'get GIT_EDITOR without configuration' '
(
sane_unset_all_editors &&
test_expect_code 1 git var GIT_EDITOR >out &&
test_must_be_empty out
)
'
test_expect_success 'get GIT_EDITOR with configuration' '
test_config core.editor foo &&
(
sane_unset_all_editors &&
echo foo >expect &&
git var GIT_EDITOR >actual &&
test_cmp expect actual
)
'
test_expect_success 'get GIT_EDITOR with environment variable GIT_EDITOR' '
(
sane_unset_all_editors &&
echo bar >expect &&
GIT_EDITOR=bar git var GIT_EDITOR >actual &&
test_cmp expect actual
)
'
test_expect_success 'get GIT_EDITOR with environment variable EDITOR' '
(
sane_unset_all_editors &&
echo bar >expect &&
EDITOR=bar git var GIT_EDITOR >actual &&
test_cmp expect actual
)
'
test_expect_success 'get GIT_EDITOR with configuration and environment variable GIT_EDITOR' '
test_config core.editor foo &&
(
sane_unset_all_editors &&
echo bar >expect &&
GIT_EDITOR=bar git var GIT_EDITOR >actual &&
test_cmp expect actual
)
'
test_expect_success 'get GIT_EDITOR with configuration and environment variable EDITOR' '
test_config core.editor foo &&
(
sane_unset_all_editors &&
echo foo >expect &&
EDITOR=bar git var GIT_EDITOR >actual &&
test_cmp expect actual
)
'
test_expect_success 'get GIT_SEQUENCE_EDITOR without configuration' '
(
sane_unset GIT_SEQUENCE_EDITOR &&
git var GIT_EDITOR >expect &&
git var GIT_SEQUENCE_EDITOR >actual &&
test_cmp expect actual
)
'
test_expect_success 'get GIT_SEQUENCE_EDITOR with configuration' '
test_config sequence.editor foo &&
(
sane_unset GIT_SEQUENCE_EDITOR &&
echo foo >expect &&
git var GIT_SEQUENCE_EDITOR >actual &&
test_cmp expect actual
)
'
test_expect_success 'get GIT_SEQUENCE_EDITOR with environment variable' '
(
sane_unset GIT_SEQUENCE_EDITOR &&
echo bar >expect &&
GIT_SEQUENCE_EDITOR=bar git var GIT_SEQUENCE_EDITOR >actual &&
test_cmp expect actual
)
'
test_expect_success 'get GIT_SEQUENCE_EDITOR with configuration and environment variable' '
test_config sequence.editor foo &&
(
sane_unset GIT_SEQUENCE_EDITOR &&
echo bar >expect &&
GIT_SEQUENCE_EDITOR=bar git var GIT_SEQUENCE_EDITOR >actual &&
test_cmp expect actual
)
'
test_expect_success POSIXPERM 'GIT_SHELL_PATH points to a valid executable' '
shellpath=$(git var GIT_SHELL_PATH) &&
test_path_is_executable "$shellpath"
'
# We know in this environment that our shell will be one of a few fixed values
# that all end in "sh".
test_expect_success MINGW 'GIT_SHELL_PATH points to a suitable shell' '
shellpath=$(git var GIT_SHELL_PATH) &&
case "$shellpath" in
*sh) ;;
*) return 1;;
esac
'
test_expect_success 'GIT_ATTR_SYSTEM produces expected output' '
test_must_fail env GIT_ATTR_NOSYSTEM=1 git var GIT_ATTR_SYSTEM &&
(
sane_unset GIT_ATTR_NOSYSTEM &&
systempath=$(git var GIT_ATTR_SYSTEM) &&
test "$systempath" != ""
)
'
test_expect_success 'GIT_ATTR_GLOBAL points to the correct location' '
TRASHDIR="$(test-tool path-utils normalize_path_copy "$(pwd)")" &&
globalpath=$(XDG_CONFIG_HOME="$TRASHDIR/.config" git var GIT_ATTR_GLOBAL) &&
test "$globalpath" = "$TRASHDIR/.config/git/attributes" &&
(
sane_unset XDG_CONFIG_HOME &&
globalpath=$(HOME="$TRASHDIR" git var GIT_ATTR_GLOBAL) &&
test "$globalpath" = "$TRASHDIR/.config/git/attributes"
)
'
test_expect_success 'GIT_CONFIG_SYSTEM points to the correct location' '
TRASHDIR="$(test-tool path-utils normalize_path_copy "$(pwd)")" &&
test_must_fail env GIT_CONFIG_NOSYSTEM=1 git var GIT_CONFIG_SYSTEM &&
(
sane_unset GIT_CONFIG_NOSYSTEM &&
systempath=$(git var GIT_CONFIG_SYSTEM) &&
test "$systempath" != "" &&
systempath=$(GIT_CONFIG_SYSTEM=/dev/null git var GIT_CONFIG_SYSTEM) &&
if test_have_prereq MINGW
then
test "$systempath" = "nul"
else
test "$systempath" = "/dev/null"
fi &&
systempath=$(GIT_CONFIG_SYSTEM="$TRASHDIR/gitconfig" git var GIT_CONFIG_SYSTEM) &&
test "$systempath" = "$TRASHDIR/gitconfig"
)
'
test_expect_success 'GIT_CONFIG_GLOBAL points to the correct location' '
TRASHDIR="$(test-tool path-utils normalize_path_copy "$(pwd)")" &&
HOME="$TRASHDIR" XDG_CONFIG_HOME="$TRASHDIR/foo" git var GIT_CONFIG_GLOBAL >actual &&
echo "$TRASHDIR/foo/git/config" >expected &&
echo "$TRASHDIR/.gitconfig" >>expected &&
test_cmp expected actual &&
(
sane_unset XDG_CONFIG_HOME &&
HOME="$TRASHDIR" git var GIT_CONFIG_GLOBAL >actual &&
echo "$TRASHDIR/.config/git/config" >expected &&
echo "$TRASHDIR/.gitconfig" >>expected &&
test_cmp expected actual &&
globalpath=$(GIT_CONFIG_GLOBAL=/dev/null git var GIT_CONFIG_GLOBAL) &&
if test_have_prereq MINGW
then
test "$globalpath" = "nul"
else
test "$globalpath" = "/dev/null"
fi &&
globalpath=$(GIT_CONFIG_GLOBAL="$TRASHDIR/gitconfig" git var GIT_CONFIG_GLOBAL) &&
test "$globalpath" = "$TRASHDIR/gitconfig"
)
'
# For git var -l, we check only a representative variable;
# testing the whole output would make our test too brittle with
# respect to unrelated changes in the test suite's environment.
test_expect_success 'git var -l lists variables' '
git var -l >actual &&
echo "$GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL> $GIT_AUTHOR_DATE" >expect &&
sed -n s/GIT_AUTHOR_IDENT=//p <actual >actual.author &&
test_cmp expect actual.author
'
test_expect_success 'git var -l lists config' '
git var -l >actual &&
echo false >expect &&
sed -n s/core\\.bare=//p <actual >actual.bare &&
test_cmp expect actual.bare
'
test_expect_success 'git var -l lists multiple global configs' '
TRASHDIR="$(test-tool path-utils normalize_path_copy "$(pwd)")" &&
HOME="$TRASHDIR" XDG_CONFIG_HOME="$TRASHDIR/foo" git var -l >actual &&
grep "^GIT_CONFIG_GLOBAL=" actual >filtered &&
echo "GIT_CONFIG_GLOBAL=$TRASHDIR/foo/git/config" >expected &&
echo "GIT_CONFIG_GLOBAL=$TRASHDIR/.gitconfig" >>expected &&
test_cmp expected filtered
'
test_expect_success 'git var -l does not split multiline editors' '
(
GIT_EDITOR="!f() {
echo Hello!
}; f" &&
export GIT_EDITOR &&
echo "GIT_EDITOR=$GIT_EDITOR" >expected &&
git var -l >var &&
sed -n -e "/^GIT_EDITOR/,\$p" var | head -n 3 >actual &&
test_cmp expected actual
)
'
test_expect_success 'listing and asking for variables are exclusive' '
test_must_fail git var -l GIT_COMMITTER_IDENT
'
test_expect_success '`git var -l` works even without HOME' '
(
XDG_CONFIG_HOME= &&
export XDG_CONFIG_HOME &&
unset HOME &&
git var -l
)
'
test_done