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show-index: update documentation for index v2

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Commit 32637cdf4a (show-index.c: learn about index v2,
2007-04-09) changed the output format of show-index to
include the object CRC32 but didn't update the
documentation. Let's fix that and generally describe the
output in more detail.

There are a few other fixes here while we're rewording:

 - refer to index-pack along with pack-objects, since either
   can create .idx files

 - use "linkgit:" for referring to other commands

 - expand the bit about verify-pack, giving reasons why you
   might want this command instead. I almost omitted this
   entirely, but referring to verify-pack might help a
   reader who is looking for more information.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2018-05-28 05:39:23 -04:00 committed by Junio C Hamano
parent ff417260cf
commit fb3010c31f
1 changed files with 20 additions and 6 deletions
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26
Documentation/git-show-index.txt
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@ -14,13 +14,27 @@ SYNOPSIS
DESCRIPTION
-----------
Read the idx file for a Git packfile created with
'git pack-objects' command from the standard input, and
dump its contents.
Read the `.idx` file for a Git packfile (created with
linkgit:git-pack-objects[1] or linkgit:git-index-pack[1]) from the
standard input, and dump its contents. The output consists of one object
per line, with each line containing two or three space-separated
columns:
The information it outputs is subset of what you can get from
'git verify-pack -v'; this command only shows the packfile
offset and SHA-1 of each object.
- the first column is the offset in bytes of the object within the
corresponding packfile
- the second column is the object id of the object
- if the index version is 2 or higher, the third column contains the
CRC32 of the object data
The objects are output in the order in which they are found in the index
file, which should be (in a correctly constructed file) sorted by object
id.
Note that you can get more information on a packfile by calling
linkgit:git-verify-pack[1]. However, as this command considers only the
index file itself, it's both faster and more flexible.
GIT
---