pathspec: die on empty strings as pathspec

An empty string as a pathspec element matches all paths.  A buggy
script, however, could accidentally assign an empty string to a
variable that then gets passed to a Git command invocation, e.g.:

path=... compute a path to be removed in $path ...
git rm -r "$path"

which would unintentionally remove all paths in the current
directory.

The fix for this issue comprises of two steps. Step 1, which warns
that empty strings as pathspecs will become invalid, has already
been implemented in commit d426430 ("pathspec: warn on empty strings
as pathspec", 2016-06-22).

This patch is step 2. It removes the warning and throws an error
instead.

Signed-off-by: Emily Xie <emilyxxie@gmail.com>
Reported-by: David Turner <novalis@novalis.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/pathspec.c b/pathspec.c
index 729df9f385fd2542d7b889b010fe33dfc8ddd019..c32503d079ff7eee36b4fdc2dee48b01a2d55fea 100644 (file)
--- a/pathspec.c
+++ b/pathspec.c
@@ -364,7 +364,7 @@ void parse_pathspec(struct pathspec *pathspec,
 {
        struct pathspec_item *item;
        const char *entry = argv ? *argv : NULL;
-       int i, n, prefixlen, warn_empty_string, nr_exclude = 0;
+       int i, n, prefixlen, nr_exclude = 0;
 
        memset(pathspec, 0, sizeof(*pathspec));
 
@@ -402,13 +402,10 @@ void parse_pathspec(struct pathspec *pathspec,
        }
 
        n = 0;
-       warn_empty_string = 1;
        while (argv[n]) {
-               if (*argv[n] == '\0' && warn_empty_string) {
-                       warning(_("empty strings as pathspecs will be made invalid in upcoming releases. "
-                                 "please use . instead if you meant to match all paths"));
-                       warn_empty_string = 0;
-               }
+               if (*argv[n] == '\0')
+                       die("empty string is not a valid pathspec. "
+                                 "please use . instead if you meant to match all paths");
                n++;
        }
 

diff --git a/t/t3600-rm.sh b/t/t3600-rm.sh
index 14f0edca2b6f67e6ae98379702b5566e4083d8e0..44624605e3c29cb31e06ddd8ea13a6cb86dd0b10 100755 (executable)
--- a/t/t3600-rm.sh
+++ b/t/t3600-rm.sh
@@ -881,9 +881,8 @@ test_expect_success 'rm files with two different errors' '
        test_i18ncmp expect actual
 '
 
-test_expect_success 'rm empty string should invoke warning' '
-       git rm -rf "" 2>output &&
-       test_i18ngrep "warning: empty strings" output
+test_expect_success 'rm empty string should fail' '
+       test_must_fail git rm -rf ""
 '
 
 test_done

diff --git a/t/t3700-add.sh b/t/t3700-add.sh
index 05379d0a4a5c5312896f8cc13e286ebb37c517e7..6357d6e74e6e50876924574aa30578c7bb411577 100755 (executable)
--- a/t/t3700-add.sh
+++ b/t/t3700-add.sh
@@ -332,9 +332,8 @@ test_expect_success 'git add --dry-run --ignore-missing of non-existing file out
        test_i18ncmp expect.err actual.err
 '
 
-test_expect_success 'git add empty string should invoke warning' '
-       git add "" 2>output &&
-       test_i18ngrep "warning: empty strings" output
+test_expect_success 'git add empty string should fail' '
+       test_must_fail git add ""
 '
 
 test_done