>> So how do I get a directory listing from fast-import, i.e.
>> like I can get with "git cat-file -p", but without having to fork
>> a separate git process?
> I'm not sure I understand your use case exactly, but is the directory
> listing you want part of the newly-added objects from fast-import, or
> does it already exist in the branches you are collecting from?
For the most important cases, the relevant revision already exists
before fast-import, yes.
> If the latter, I wonder if a separate "cat-file --batch" process could
> give you what you need (it's a separate process, but you can start a
I'm not sure exactly how "git cat-file --batch" works internally
(whether it tries to keep active revisions, like fast-import does), but
I've indeed used it successfully (tho for files).
> single process and make many queries of it; I assume your desire not to
> add an extra process is to avoid the overhead).
The overhead of starting a new process is one part, but another is the
overhead of re-reading the refs (I can have tens of thousands of
branches in my repository), etc..
> But I think it won't pretty-print trees for you; it will give you the
> raw tree data
Indeed.
> (which I imagine is what you are getting from cat-blob, too).
Actually no, "cat-blob" gives an error instead:
fatal: Object 2ca1672d50c9dbfe582dc53af3c7ce9891a7a664 is a tree but a blob was expected.
> I'm not sure that's actually documented anywhere (it was part of
> the original revisions of git, and hasn't changed since). But it is
> basically:
> tree = tree_entry*
> tree_entry = mode SP path NUL sha1
> mode = ascii mode, in octal (e.g., "100644")
> path = <any byte except NUL>*
> sha1 = <any byte>{20}
> SP = ascii space (0x20)
> NUL = 0-byte
Ah, thanks. It'd be great if cat-blob could return this instead of
signalling an error.
> So it is pretty simple to parse.
My program is written in /bin/sh so parsing the above is actually rather
inconvenient, but it's much better than just getting an error.
Stefan
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