Re: [PATCH v2 01/10] ls-files: add --json to dump the index

> So far we don't have a command to basically dump the index file out,
> with all its glory details. Checking some info, for example, stat
> time, usually involves either writing new code or firing up "xxd" and
> decoding values by yourself.
> 
> This --json is supposed to help that. It dumps the index in a human
> readable format but also easy to be processed with tools. And it will
> print almost enough info to reconstruct the index later.
> 
> In this patch we only dump the main part, not extensions. But at the
> end of the series, the entire index is dumped. The end result could be
> very verbose even on a small repository such as git.git.
> 
> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
> ---
>  Documentation/git-ls-files.txt    |  5 +++
>  builtin/ls-files.c                | 38 +++++++++++++---
>  cache.h                           |  2 +
>  json-writer.c                     | 22 ++++++++++
>  json-writer.h                     | 23 ++++++++++
>  read-cache.c                      | 72 ++++++++++++++++++++++++++++++-
>  t/t3011-ls-files-json.sh (new +x) | 44 +++++++++++++++++++
>  t/t3011/basic (new)               | 67 ++++++++++++++++++++++++++++
>  8 files changed, 265 insertions(+), 8 deletions(-)
>
> [...]
>
> diff --git a/t/t3011-ls-files-json.sh b/t/t3011-ls-files-json.sh
> new file mode 100755
> index 0000000000..97bcd814be
> --- /dev/null
> +++ b/t/t3011-ls-files-json.sh
> @@ -0,0 +1,44 @@
> +#!/bin/sh
> +
> +test_description='ls-files dumping json'
> +
> +. ./test-lib.sh
> +
> +strip_number() {
> +	for name; do
> +		echo 's/\("'$name'":\) [0-9]\+/\1 <number>/' >>filter.sed
> +	done
> +}
> +
> +strip_string() {
> +	for name; do
> +		echo 's/\("'$name'":\) ".*"/\1 <string>/' >>filter.sed
> +	done
> +}
> +
> +compare_json() {
> +	git ls-files --debug-json >json &&
> +	sed -f filter.sed json >filtered &&
> +	test_cmp "$TEST_DIRECTORY"/t3011/"$1" filtered
> +}
> +
> +test_expect_success 'setup' '
> +	mkdir sub &&
> +	echo one >one &&
> +	git add one &&
> +	echo 2 >sub/two &&
> +	git add sub/two &&
> +
> +	echo intent-to-add >ita &&
> +	git add -N ita &&
> +
> +	strip_number ctime_sec ctime_nsec mtime_sec mtime_nsec &&
> +	strip_number device inode uid gid file_offset ext_size &&
> +	strip_string oid ident
> +'
> +
> +test_expect_success 'ls-files --json, main entries' '
> +	compare_json basic
> +'
> +
> +test_done
> diff --git a/t/t3011/basic b/t/t3011/basic
> new file mode 100644
> index 0000000000..9436445d90
> --- /dev/null
> +++ b/t/t3011/basic
> @@ -0,0 +1,67 @@
> +{
> +  "version": 3,

> +  "oid": <string>,
> +  "mtime_sec": <number>,
> +  "mtime_nsec": <number>,
> +  "entries": [
> +    {
> +      "id": 0,
> +      "name": "ita",
> +      "mode": "100644",
> +      "flags": 536887296,
> +      "extended_flags": true,
> +      "intent_to_add": true,
> +      "oid": <string>,
> +      "stat": {
> +        "ctime_sec": <number>,
> +        "ctime_nsec": <number>,
> +        "mtime_sec": <number>,
> +        "mtime_nsec": <number>,
> +        "device": <number>,
> +        "inode": <number>,
> +        "uid": <number>,
> +        "gid": <number>,
> +        "size": 0
> +      },
> +      "file_offset": <number>
> +    },
> +    {
> +      "id": 1,
> +      "name": "one",
> +      "mode": "100644",
> +      "flags": 0,
> +      "oid": <string>,
> +      "stat": {
> +        "ctime_sec": <number>,
> +        "ctime_nsec": <number>,
> +        "mtime_sec": <number>,
> +        "mtime_nsec": <number>,
> +        "device": <number>,
> +        "inode": <number>,
> +        "uid": <number>,
> +        "gid": <number>,
> +        "size": 4
> +      },
> +      "file_offset": <number>
> +    },
> +    {
> +      "id": 2,
> +      "name": "sub/two",
> +      "mode": "100644",
> +      "flags": 0,
> +      "oid": <string>,
> +      "stat": {
> +        "ctime_sec": <number>,
> +        "ctime_nsec": <number>,
> +        "mtime_sec": <number>,
> +        "mtime_nsec": <number>,
> +        "device": <number>,
> +        "inode": <number>,
> +        "uid": <number>,
> +        "gid": <number>,
> +        "size": 2
> +      },
> +      "file_offset": <number>
> +    }
> +  ]
> +}
> -- 
> 2.22.0.rc0.322.g2b0371e29a
>