Re: [PATCH] notes: Disallow reusing non-blob as a note object

[Eric Sunshine]

On Wed, Feb 12, 2014 at 4:54 AM, Johan Herland jo...@herland.net wrote:
 Currently git notes add -C $object will read the raw bytes from $object,
 and then copy those bytes into the note object, which is hardcoded to be
 of type blob. This means that if the given $object is a non-blob (e.g.
 tree or commit), the raw bytes from that object is copied into a blob
 object. This is probably not useful, and certainly not what any sane
 user would expect. So disallow it, by erroring out if the $object passed
 to the -C option is not a blob.

 The fix also applies to the -c option (in which the user is prompted to
 edit/verify the note contents in a text editor), and also when -c/-C is
 passed to git notes append (which appends the $object contents to an
 existing note object). In both cases, passing a non-blob $object does not
 make sense.

 Also add a couple of tests demonstrating expected behavior.

 Suggested-by: Junio C Hamano gits...@pobox.com
 Signed-off-by: Johan Herland jo...@herland.net
 ---
  builtin/notes.c  |  6 +-
  t/t3301-notes.sh | 27 +++
  2 files changed, 32 insertions(+), 1 deletion(-)

 diff --git a/builtin/notes.c b/builtin/notes.c
 index 2b24d05..bb89930 100644
 --- a/builtin/notes.c
 +++ b/builtin/notes.c
 @@ -269,7 +269,11 @@ static int parse_reuse_arg(const struct option *opt, 
 const char *arg, int unset)
 die(_(Failed to resolve '%s' as a valid ref.), arg);
 if (!(buf = read_sha1_file(object, type, len)) || !len) {
 free(buf);
 -   die(_(Failed to read object '%s'.), arg);;
 +   die(_(Failed to read object '%s'.), arg);
 +   }
 +   if (type != OBJ_BLOB) {
 +   free(buf);
 +   die(_(Cannot read note data from non-blob object '%s'.), 
 arg);

The way this diagnostic is worded, it sound as if the 'read' failed
rather than that the user specified an incorrect object type. Perhaps
Object is not a blob '%s' or Expected blob but '%s' has type '%s'
or something along those lines?

 }
 strbuf_add((msg-buf), buf, len);
 free(buf);
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Re: [PATCH] notes: Disallow reusing non-blob as a note object

[Junio C Hamano]

Eric Sunshine sunsh...@sunshineco.com writes:

 +   if (type != OBJ_BLOB) {
 +   free(buf);
 +   die(_(Cannot read note data from non-blob object '%s'.), 
 arg);

 The way this diagnostic is worded, it sound as if the 'read' failed
 rather than that the user specified an incorrect object type. Perhaps
 Object is not a blob '%s' or Expected blob but '%s' has type '%s'
 or something along those lines?

Yeah, sounds good.  You also need to say what expects a blob, too.
Perhaps something like this?

 builtin/notes.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/builtin/notes.c b/builtin/notes.c
index c11d6e6..a16bc00 100644
--- a/builtin/notes.c
+++ b/builtin/notes.c
@@ -272,8 +272,10 @@ static int parse_reuse_arg(const struct option *opt, const 
char *arg, int unset)
die(_(Failed to read object '%s'.), arg);
}
if (type != OBJ_BLOB) {
+   struct msg_arg *msg = opt-value;
free(buf);
-   die(_(Cannot read note data from non-blob object '%s'.), arg);
+   die(_(The -%c option takes a blob, which '%s' is not.,
+ msg-use_editor ? 'c' : 'C', arg));
}
strbuf_add((msg-buf), buf, len);
free(buf);
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