Do not print 'dangling' for cat-file in case of ambiguity

The return values -1 and -2 from get_oid could mean two different
things, depending on whether they were from an enum returned by
get_tree_entry_follow_symlinks, or from a different code path.  This
caused 'dangling' to be printed from a git cat-file in the case of an
ambiguous (-2) result.

Unify the results of get_oid* and get_tree_entry_follow_symlinks to be
one common type, with unambiguous values.

Signed-off-by: David Turner <novalis@novalis.org>
Reported-by: Eric Wong <e@80x24.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 19 insertions, 1 deletions

diff --git a/cache.h b/cache.h
index 49713cc..70652e9 100644
--- a/cache.h
+++ b/cache.h
@@ -1332,6 +1332,24 @@ struct object_context {
 	GET_OID_TREE | GET_OID_TREEISH | \
 	GET_OID_BLOB)
 
+enum get_oid_result {
+	FOUND = 0,
+	MISSING_OBJECT = -1, /* The requested object is missing */
+	SHORT_NAME_AMBIGUOUS = -2,
+	/* The following only apply when symlinks are followed */
+	DANGLING_SYMLINK = -4, /*
+				* The initial symlink is there, but
+				* (transitively) points to a missing
+				* in-tree file
+				*/
+	SYMLINK_LOOP = -5,
+	NOT_DIR = -6, /*
+		       * Somewhere along the symlink chain, a path is
+		       * requested which contains a file as a
+		       * non-final element.
+		       */
+};
+
 extern int get_oid(const char *str, struct object_id *oid);
 extern int get_oid_commit(const char *str, struct object_id *oid);
 extern int get_oid_committish(const char *str, struct object_id *oid);
@@ -1339,7 +1357,7 @@ extern int get_oid_tree(const char *str, struct object_id *oid);
 extern int get_oid_treeish(const char *str, struct object_id *oid);
 extern int get_oid_blob(const char *str, struct object_id *oid);
 extern void maybe_die_on_misspelt_object_name(const char *name, const char *prefix);
-extern int get_oid_with_context(const char *str, unsigned flags, struct object_id *oid, struct object_context *oc);
+extern enum get_oid_result get_oid_with_context(const char *str, unsigned flags, struct object_id *oid, struct object_context *oc);
 
 
 typedef int each_abbrev_fn(const struct object_id *oid, void *);