GUARD_PATHSPEC() marks pathspec-sensitive code, basically all those
that touch anything in 'struct pathspec' except fields "nr" and
"original". GUARD_PATHSPEC() is not supposed to fail. It's mainly to
help the designers to catch unsupported codepaths.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
Documentation/technical/api-setup.txt | 19 +++++++++++++++++++
builtin/diff.c | 2 ++
dir.c | 2 ++
pathspec.h | 7 +++++++
tree-diff.c | 19 +++++++++++++++++++
tree-walk.c | 2 ++
6 files changed, 51 insertions(+)
diff --git a/Documentation/technical/api-setup.txt b/Documentation/technical/api-setup.txt
index 90d1aff..540e455 100644
--- a/Documentation/technical/api-setup.txt
+++ b/Documentation/technical/api-setup.txt
@@ -28,3 +28,22 @@ parse_pathspec(). This function takes several arguments:
- prefix and args come from cmd_* functions
get_pathspec() is obsolete and should never be used in new code.
+
+parse_pathspec() helps catch unsupported features and reject them
+politely. At a lower level, different pathspec-related functions may
+not support the same set of features. Such pathspec-sensitive
+functions are guarded with GUARD_PATHSPEC(), which will die in an
+unfriendly way when an unsupported feature is requested.
+
+The command designers are supposed to make sure that GUARD_PATHSPEC()
+never dies. They have to make sure all unsupported features are caught
+by parse_pathspec(), not by GUARD_PATHSPEC. grepping GUARD_PATHSPEC()
+should give the designers all pathspec-sensitive codepaths and what
+features they support.
+
+A similar process is applied when a new pathspec magic is added. The
+designer lifts the GUARD_PATHSPEC restriction in the functions that
+support the new magic. At the same time (s)he has to make sure this
+new feature will be caught at parse_pathspec() in commands that cannot
+handle the new magic in some cases. grepping parse_pathspec() should
+help.
diff --git a/builtin/diff.c b/builtin/diff.c
index 8c2af6c..d237e0a 100644
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -371,6 +371,8 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
die(_("unhandled object '%s' given."), name);
}
if (rev.prune_data.nr) {
+ /* builtin_diff_b_f() */
+ GUARD_PATHSPEC(&rev.prune_data, PATHSPEC_FROMTOP);
if (!path)
path = rev.prune_data.items[0].match;
paths += rev.prune_data.nr;
diff --git a/dir.c b/dir.c
index cfcdda5..fcc0b97 100644
--- a/dir.c
+++ b/dir.c
@@ -340,6 +340,8 @@ int match_pathspec_depth(const struct pathspec *ps,
{
int i, retval = 0;
+ GUARD_PATHSPEC(ps, PATHSPEC_FROMTOP | PATHSPEC_MAXDEPTH);
+
if (!ps->nr) {
if (!ps->recursive ||
!(ps->magic & PATHSPEC_MAXDEPTH) ||
diff --git a/pathspec.h b/pathspec.h
index 3ca6636..7068f7d 100644
--- a/pathspec.h
+++ b/pathspec.h
@@ -27,6 +27,13 @@ struct pathspec {
} *items;
};
+#define GUARD_PATHSPEC(ps, mask) \
+ do { \
+ if ((ps)->magic & ~(mask)) \
+ die("BUG:%s:%d: unsupported magic %x", \
+ __FILE__, __LINE__, (ps)->magic & ~(mask)); \
+ } while (0)
+
/* parse_pathspec flags */
#define PATHSPEC_PREFER_CWD (1<<0) /* No args means match cwd */
#define PATHSPEC_PREFER_FULL (1<<1) /* No args means match everything */
diff --git a/tree-diff.c b/tree-diff.c
index 826512e..5a87614 100644
--- a/tree-diff.c
+++ b/tree-diff.c
@@ -198,6 +198,25 @@ static void try_to_follow_renames(struct tree_desc *t1, struct tree_desc *t2, co
const char *paths[1];
int i;
+ /*
+ * follow-rename code is very specific, we need exactly one
+ * path. Magic that matches more than one path is not
+ * supported.
+ */
+ GUARD_PATHSPEC(&opt->pathspec, PATHSPEC_FROMTOP);
+#if 0
+ /*
+ * We should reject wildcards as well. Unfortunately we
+ * haven't got a reliable way to detect that 'foo\*bar' in
+ * fact has no wildcards. nowildcard_len is merely a hint for
+ * optimization. Let it slip for now until wildmatch is taught
+ * about dry-run mode and returns wildcard info.
+ */
+ if (opt->pathspec.has_wildcard)
+ die("BUG:%s:%d: wildcards are not supported",
+ __FILE__, __LINE__);
+#endif
+
/* Remove the file creation entry from the diff queue, and remember it */
choice = q->queue[0];
q->nr = 0;
diff --git a/tree-walk.c b/tree-walk.c
index d399ca9..37b157e 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -636,6 +636,8 @@ enum interesting tree_entry_interesting(const struct name_entry *entry,
enum interesting never_interesting = ps->has_wildcard ?
entry_not_interesting : all_entries_not_interesting;
+ GUARD_PATHSPEC(ps, PATHSPEC_FROMTOP | PATHSPEC_MAXDEPTH);
+
if (!ps->nr) {
if (!ps->recursive ||
!(ps->magic & PATHSPEC_MAXDEPTH) ||
--
1.8.2.83.gc99314b
--
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