[PATCH] Disallow '\' in ref names

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This is asking for trouble since '\' is a directory separator in
Windows and thus may produce unpredictable results.

Signed-off-by: Robin Rosenberg <robin.rosenberg@xxxxxxxxxx>
---
 Documentation/git-check-ref-format.txt |    2 ++
 refs.c                                 |    3 ++-
 2 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/Documentation/git-check-ref-format.txt b/Documentation/git-check-ref-format.txt
index c1ce268..4884520 100644
--- a/Documentation/git-check-ref-format.txt
+++ b/Documentation/git-check-ref-format.txt
@@ -38,6 +38,8 @@ imposes the following rules on how references are named:
 
 . They cannot contain a sequence `@{`.
 
+- They cannot contain a `\\`
+
 These rules make it easy for shell script based tools to parse
 reference names, pathname expansion by the shell when a reference name is used
 unquoted (by mistake), and also avoids ambiguities in certain
diff --git a/refs.c b/refs.c
index e65a3b4..fc33bc6 100644
--- a/refs.c
+++ b/refs.c
@@ -682,12 +682,13 @@ int for_each_rawref(each_ref_fn fn, void *cb_data)
  * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
  * - it ends with a "/".
  * - it ends with ".lock"
+ * - it contains a "\" (backslash)
  */
 
 static inline int bad_ref_char(int ch)
 {
 	if (((unsigned) ch) <= ' ' ||
-	    ch == '~' || ch == '^' || ch == ':')
+	    ch == '~' || ch == '^' || ch == ':' || ch == '\\')
 		return 1;
 	/* 2.13 Pattern Matching Notation */
 	if (ch == '?' || ch == '[') /* Unsupported */
-- 
1.6.3.dirty

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