config --get --path: check for unset $HOME

If $HOME is unset (as in some automated build situations),
currently

	git config --path path.home "~"
	git config --path --get path.home

segfaults.  Error out with

	Failed to expand user dir in: '~/'

instead.

Reported-by: Julien Cristau <jcristau@debian.org>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/path.c b/path.c
index aaa9345ebca4140317d8509ba95ec61cff82192d..f6226fcd557b1b06706775cb3a32cc780ee2b708 100644 (file)
--- a/path.c
+++ b/path.c
@@ -316,6 +316,8 @@ char *expand_user_path(const char *path)
                size_t username_len = first_slash - username;
                if (username_len == 0) {
                        const char *home = getenv("HOME");
+                       if (!home)
+                               goto return_null;
                        strbuf_add(&user_path, home, strlen(home));
                } else {
                        struct passwd *pw = getpw_str(username, username_len);

diff --git a/t/t1300-repo-config.sh b/t/t1300-repo-config.sh
index f11f98c3ce7e35f61d06542ce707d61b98079fda..7ddab5fb76697442808e2818ec3bc5c635731830 100755 (executable)
--- a/t/t1300-repo-config.sh
+++ b/t/t1300-repo-config.sh
@@ -707,19 +707,41 @@ test_expect_success 'set --path' '
        git config --path path.trailingtilde "foo~" &&
        test_cmp expect .git/config'
 
+if test "${HOME+set}"
+then
+       test_set_prereq HOMEVAR
+fi
+
 cat >expect <<EOF
 $HOME/
 /dev/null
 foo~
 EOF
 
-test_expect_success 'get --path' '
+test_expect_success HOMEVAR 'get --path' '
        git config --get --path path.home > result &&
        git config --get --path path.normal >> result &&
        git config --get --path path.trailingtilde >> result &&
        test_cmp expect result
 '
 
+cat >expect <<\EOF
+/dev/null
+foo~
+EOF
+
+test_expect_success 'get --path copes with unset $HOME' '
+       (
+               unset HOME;
+               test_must_fail git config --get --path path.home \
+                       >result 2>msg &&
+               git config --get --path path.normal >>result &&
+               git config --get --path path.trailingtilde >>result
+       ) &&
+       grep "[Ff]ailed to expand.*~/" msg &&
+       test_cmp expect result
+'
+
 rm .git/config
 
 git config quote.leading " test"