On Tue, Sep 3, 2013 at 1:50 PM, Junio C Hamano <gits...@pobox.com> wrote:
> Felipe Contreras <felipe.contre...@gmail.com> writes:
>
>> diff --git a/sha1_name.c b/sha1_name.c
>> index 93197b9..b8ece6e 100644
>> --- a/sha1_name.c
>> +++ b/sha1_name.c
>> @@ -1004,6 +1004,26 @@ int get_sha1_mb(const char *name, unsigned char *sha1)
>>       return st;
>>  }
>>
>> +/* parse @something syntax, when 'something' is not {.*} */
>> +static int interpret_empty_at(const char *name, int namelen, int len, 
>> struct strbuf *buf)
>> +{
>> +     const char *next;
>> +
>> +     if (len || name[1] == '{')
>> +             return -1;
>> +
>> +     /* make sure it's a single @, or @@{.*}, not @foo */
>> +     next = strchr(name + len + 1, '@');
>> +     if (!next)
>> +             next = name + namelen;
>> +     if (next != name + 1)
>> +             return -1;
>> +
>> +     strbuf_reset(buf);
>> +     strbuf_add(buf, "HEAD", 4);
>> +     return 1;
>> +}
>
> Hmph, is the above sufficient?  I added a case that mimics Stefano's
> original regression report (which is handled) and another that uses
> doubled "@" for the same purpose of introducing a "funny" hierarchy,
> and it appears that "checkout -b" chokes on it.

This fixes it:

--- a/sha1_name.c
+++ b/sha1_name.c
@@ -1014,6 +1014,8 @@ static int interpret_empty_at(const char *name,
int namelen, int len, struct str

        /* make sure it's a single @, or @@{.*}, not @foo */
        next = strchr(name + len + 1, '@');
+       if (next && next[1] != '{')
+               return -1;
        if (!next)
                next = name + namelen;
        if (next != name + 1)

-- 
Felipe Contreras
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