tagsize < 8kb restriction

Hi,

I am currently working on an interface for source code quality assurance tools to automatically scan newly commited code. Since it is the only way to add data (scan-results) to an already-existing commit, I decided to use tags for that.

Since the scan-results will most definitly exeed the 8kb-limit, I would like to remove this artificial restriction.

I know I could also

git-hash-object -t tag -w

but prefer using the "official" way.

In order not to write duplicate code I used parts of index_pipe() in sha1_file.c

What I found odd when writing the patch was that main() in mktag.c uses xread() to read from stdin (which respects EAGAIN and EINTR return values), but index_pipe() in sha1_file.c just uses read() for doing merely the same thing. For unifying both routines i found that xread() might be the better choice.

Removing the restriction was pretty straightforward but do you think this would break something in other places ?

[PATCH 1/2]
remove the < 8kb restrinction from git-mktag

[PATCH 2/2]
add more informative error messages to git-mktag

Bj