From: Junio C Hamano <gitster@pobox.com>
To: Johannes Schindelin <johannes.schindelin@gmx.de>
Cc: git@vger.kernel.org
Subject: Re: [PATCH 2/4] cat-file: introduce the --filters option
Date: Thu, 18 Aug 2016 09:37:27 -0700 [thread overview]
Message-ID: <xmqqk2fe6njs.fsf@gitster.mtv.corp.google.com> (raw)
In-Reply-To: <f1e188907f31abef9e82bd6b0da120ab7d9bd4a7.1471524357.git.johannes.schindelin@gmx.de> (Johannes Schindelin's message of "Thu, 18 Aug 2016 14:46:17 +0200 (CEST)")
Johannes Schindelin <johannes.schindelin@gmx.de> writes:
> As suggested by its name, the --filters option applies the filters
> that are currently configured for the specified path.
>
> This feature comes in handy when a 3rd-party tool wants to work with
> the contents of files from past revisions as if they had been checked
> out, but without detouring via temporary files.
>
> Note that we ensure that symbolic links are unaffected (we know from
> looking at the mode whether it refers to a symbolic link or a regular
> file).
I think you can lose the last paragraph and enrich the first one
instead. The text as-given does not even say anything about the new
option affecting only blobs.
The --filters option applies the convert_to_working_tree()
filter for the path when showing the contents of a regular
file blob object.
or something like that.
> +--filters::
> + Show the content as transformed by the filters configured in
> + the current working tree for the given <path> (i.e. smudge filters,
> + end-of-line conversion, etc). In this case, <object> has to be of
> + the form <tree-ish>:<path>, or :<path>.
Makes sense. We show the contents as if we are checking the blob
out to the given <path>, in other words.
> diff --git a/builtin/cat-file.c b/builtin/cat-file.c
> index 2dfe626..0b74afa 100644
> --- a/builtin/cat-file.c
> +++ b/builtin/cat-file.c
> @@ -20,6 +20,33 @@ struct batch_options {
> const char *format;
> };
>
> +static int filter_object(const char *path, unsigned mode,
> + const unsigned char *sha1,
> + char **buf, unsigned long *size)
> +{
> + enum object_type type;
> +
> + *buf = read_sha1_file(sha1, &type, size);
> + if (!*buf)
> + return error(_("cannot read object %s '%s'"),
> + sha1_to_hex(sha1), path);
> + if (type != OBJ_BLOB) {
> + free(*buf);
> + return error(_("blob expected for %s '%s'"),
> + sha1_to_hex(sha1), path);
> + }
> + if (S_ISREG(mode)) {
> + struct strbuf strbuf = STRBUF_INIT;
> + if (convert_to_working_tree(path, *buf, *size, &strbuf)) {
> + free(*buf);
> + *size = strbuf.len;
> + *buf = strbuf_detach(&strbuf, NULL);
> + }
> + }
This is just a tangent for future clean-up of the coding convention,
but if we used size_t internally throughout the system, we would be
able to use strbuf_detach(&strbuf, size) instead. With the current
coding convention, all internal sizes are ulong, and this is the
best we could do.
> @@ -61,6 +88,16 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name,
> case 'e':
> return !has_sha1_file(sha1);
>
> + case 'w':
> + if (!obj_context.path[0])
> + die("git cat-file --filters %s: <object> must be "
> + "<sha1:path>", obj_name);
> +
> + if (filter_object(obj_context.path, obj_context.mode,
> + sha1, &buf, &size))
> + return -1;
> + break;
> +
Makes sense.
> diff --git a/t/t8010-cat-file-filters.sh b/t/t8010-cat-file-filters.sh
> new file mode 100755
> index 0000000..e466634
> --- /dev/null
> +++ b/t/t8010-cat-file-filters.sh
> @@ -0,0 +1,34 @@
> +#!/bin/sh
> +
> +test_description='git cat-file filters support'
> +. ./test-lib.sh
> +
> +test_expect_success 'setup ' '
> + echo "*.txt eol=crlf diff=txt" >.gitattributes &&
> + echo "hello" | append_cr >world.txt &&
> + git add .gitattributes world.txt &&
> + test_tick &&
> + git commit -m "Initial commit"
> +'
OK, so we ask *.txt in the working tree to be CRLF (and presumably
that means the in-repository objects are LF).
> +has_cr () {
> + tr '\015' Q <"$1" | grep Q >/dev/null
> +}
> +
> +test_expect_success 'no filters with `git show`' '
> + git show HEAD:world.txt >actual &&
> + ! has_cr actual
> +
> +'
> +
> +test_expect_success 'no filters with cat-file' '
> + git cat-file blob HEAD:world.txt >actual &&
> + ! has_cr actual
> +'
OK.
> +test_expect_success 'cat-file --filters converts to worktree version' '
> + git cat-file --filters HEAD:world.txt >actual &&
> + has_cr actual
> +'
OK.
next prev parent reply other threads:[~2016-08-19 0:56 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-18 12:46 [PATCH 0/4] cat-file: optionally convert to worktree version Johannes Schindelin
2016-08-18 12:46 ` [PATCH 1/4] cat-file: fix a grammo in the man page Johannes Schindelin
2016-08-18 16:21 ` Junio C Hamano
2016-08-18 12:46 ` [PATCH 2/4] cat-file: introduce the --filters option Johannes Schindelin
2016-08-18 15:49 ` Torsten Bögershausen
2016-08-19 12:37 ` Johannes Schindelin
2016-08-19 16:06 ` Junio C Hamano
2016-08-18 16:37 ` Junio C Hamano [this message]
2016-08-19 12:49 ` Johannes Schindelin
2016-08-19 8:57 ` Torsten Bögershausen
2016-08-19 15:00 ` Johannes Schindelin
2016-08-19 16:06 ` Junio C Hamano
2016-08-22 16:51 ` Torsten Bögershausen
2016-08-24 8:00 ` Johannes Schindelin
2016-08-18 12:46 ` [PATCH 3/4] cat-file --textconv/--filters: allow specifying the path separately Johannes Schindelin
2016-08-18 16:52 ` Junio C Hamano
2016-08-19 14:49 ` Johannes Schindelin
2016-08-19 16:11 ` Junio C Hamano
2016-08-24 7:57 ` Johannes Schindelin
2016-08-18 12:46 ` [PATCH 4/4] cat-file: support --textconv/--filters in batch mode Johannes Schindelin
2016-08-18 15:42 ` Torsten Bögershausen
2016-08-19 12:25 ` Johannes Schindelin
2016-08-19 15:06 ` Jeff King
2016-08-19 16:19 ` Junio C Hamano
2016-08-18 17:08 ` Junio C Hamano
2016-08-19 12:59 ` Johannes Schindelin
2016-08-19 14:44 ` Jeff King
2016-08-18 22:05 ` Jeff King
2016-08-18 22:47 ` Junio C Hamano
2016-08-19 13:11 ` Johannes Schindelin
2016-08-19 13:09 ` Johannes Schindelin
2016-08-19 13:22 ` Jeff King
2016-08-24 12:23 ` [PATCH v2 0/4] cat-file: optionally convert to worktree version Johannes Schindelin
2016-08-24 12:23 ` [PATCH v2 1/4] cat-file: fix a grammo in the man page Johannes Schindelin
2016-08-24 12:23 ` [PATCH v2 2/4] cat-file: introduce the --filters option Johannes Schindelin
2016-08-24 17:46 ` Junio C Hamano
2016-08-24 17:52 ` Junio C Hamano
2016-08-31 20:31 ` Johannes Schindelin
2016-08-31 20:53 ` Junio C Hamano
2016-08-24 12:23 ` [PATCH v2 3/4] cat-file --textconv/--filters: allow specifying the path separately Johannes Schindelin
2016-08-24 17:49 ` Junio C Hamano
2016-08-24 18:25 ` Junio C Hamano
2016-08-31 19:49 ` Johannes Schindelin
2016-08-31 20:17 ` Junio C Hamano
2016-08-24 12:23 ` [PATCH v2 4/4] cat-file: support --textconv/--filters in batch mode Johannes Schindelin
2016-08-24 16:09 ` [PATCH v2 0/4] cat-file: optionally convert to worktree version Junio C Hamano
2016-08-24 16:19 ` Jeff King
2016-08-24 17:02 ` Junio C Hamano
2016-08-24 17:32 ` Jeff King
2016-08-24 17:55 ` Junio C Hamano
2016-08-29 21:02 ` Junio C Hamano
2016-08-31 20:34 ` Johannes Schindelin
2016-09-09 10:10 ` [PATCH v3 " Johannes Schindelin
2016-09-09 10:10 ` [PATCH v3 1/4] cat-file: fix a grammo in the man page Johannes Schindelin
2016-09-09 10:10 ` [PATCH v3 2/4] cat-file: introduce the --filters option Johannes Schindelin
2016-09-09 15:09 ` Junio C Hamano
2016-09-09 16:01 ` Johannes Schindelin
2016-09-09 16:08 ` Junio C Hamano
2016-09-09 17:16 ` Junio C Hamano
2016-09-09 17:26 ` Junio C Hamano
2016-09-10 7:57 ` Johannes Schindelin
2016-09-11 21:44 ` Junio C Hamano
2016-09-09 10:10 ` [PATCH v3 3/4] cat-file --textconv/--filters: allow specifying the path separately Johannes Schindelin
2016-09-09 18:06 ` Junio C Hamano
2016-09-10 7:59 ` Johannes Schindelin
2016-09-09 10:10 ` [PATCH v3 4/4] cat-file: support --textconv/--filters in batch mode Johannes Schindelin
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