2005-05-10 23:32:30 +02:00
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git-cat-file(1)
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===============
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NAME
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----
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2009-03-23 02:00:15 +01:00
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git-cat-file - Provide content or type and size information for repository objects
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2005-05-10 23:32:30 +02:00
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SYNOPSIS
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--------
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2008-06-03 13:06:12 +02:00
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[verse]
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2016-09-09 12:10:50 +02:00
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'git cat-file' (-t [--allow-unknown-type]| -s [--allow-unknown-type]| -e | -p | <type> | --textconv | --filters ) [--path=<path>] <object>
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2016-09-09 12:10:54 +02:00
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'git cat-file' (--batch | --batch-check) [ --textconv | --filters ] [--follow-symlinks]
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2005-05-10 23:32:30 +02:00
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DESCRIPTION
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-----------
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2009-03-23 02:00:15 +01:00
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In its first form, the command provides the content or the type of an object in
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2016-06-28 13:40:10 +02:00
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the repository. The type is required unless `-t` or `-p` is used to find the
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2016-08-24 14:23:39 +02:00
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object type, or `-s` is used to find the object size, or `--textconv` or
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`--filters` is used (which imply type "blob").
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2008-04-23 21:17:46 +02:00
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2009-03-23 02:00:15 +01:00
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In the second form, a list of objects (separated by linefeeds) is provided on
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2016-09-09 12:10:54 +02:00
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stdin, and the SHA-1, type, and size of each object is printed on stdout. The
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output format can be overridden using the optional `<format>` argument. If
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either `--textconv` or `--filters` was specified, the input is expected to
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2018-11-23 12:16:51 +01:00
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list the object names followed by the path name, separated by a single
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whitespace, so that the appropriate drivers can be determined.
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2005-05-10 23:32:30 +02:00
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OPTIONS
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-------
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<object>::
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2007-01-30 08:56:51 +01:00
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The name of the object to show.
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For a more complete list of ways to spell object names, see
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2010-10-11 18:03:32 +02:00
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the "SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
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2005-05-10 23:32:30 +02:00
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-t::
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Instead of the content, show the object type identified by
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<object>.
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2005-06-28 08:59:18 +02:00
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-s::
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Instead of the content, show the object size identified by
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<object>.
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2005-12-04 02:57:48 +01:00
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-e::
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2018-01-10 13:55:53 +01:00
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Exit with zero status if <object> exists and is a valid
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object. If <object> is of an invalid format exit with non-zero and
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emits an error on stderr.
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2005-12-04 02:57:48 +01:00
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2006-05-25 03:22:32 +02:00
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-p::
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Pretty-print the contents of <object> based on its type.
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2005-05-10 23:32:30 +02:00
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<type>::
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Typically this matches the real type of <object> but asking
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2005-10-06 00:08:26 +02:00
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for a type that can trivially be dereferenced from the given
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2005-05-10 23:32:30 +02:00
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<object> is also permitted. An example is to ask for a
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"tree" with <object> being a commit object that contains it,
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or to ask for a "blob" with <object> being a tag object that
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points at it.
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2010-06-24 14:56:55 +02:00
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--textconv::
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Show the content as transformed by a textconv filter. In this case,
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2016-08-24 14:23:36 +02:00
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<object> has to be of the form <tree-ish>:<path>, or :<path> in
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order to apply the filter to the content recorded in the index at
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<path>.
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2010-06-24 14:56:55 +02:00
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2016-08-24 14:23:39 +02:00
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--filters::
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Show the content as converted by the filters configured in
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the current working tree for the given <path> (i.e. smudge filters,
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end-of-line conversion, etc). In this case, <object> has to be of
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the form <tree-ish>:<path>, or :<path>.
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2016-09-09 12:10:50 +02:00
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--path=<path>::
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For use with --textconv or --filters, to allow specifying an object
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name and a path separately, e.g. when it is difficult to figure out
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the revision from which the blob came.
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2008-04-23 21:17:47 +02:00
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--batch::
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2013-07-10 13:45:47 +02:00
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--batch=<format>::
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Print object information and contents for each object provided
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2016-09-09 12:10:54 +02:00
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on stdin. May not be combined with any other options or arguments
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except `--textconv` or `--filters`, in which case the input lines
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2018-11-23 12:16:51 +01:00
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also need to specify the path, separated by whitespace. See the
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2016-09-09 12:10:54 +02:00
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section `BATCH OUTPUT` below for details.
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2008-04-23 21:17:47 +02:00
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2008-04-23 21:17:46 +02:00
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--batch-check::
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2013-07-10 13:45:47 +02:00
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--batch-check=<format>::
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Print object information for each object provided on stdin. May
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2016-09-09 12:10:54 +02:00
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not be combined with any other options or arguments except
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`--textconv` or `--filters`, in which case the input lines also
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2018-11-23 12:16:51 +01:00
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need to specify the path, separated by whitespace. See the
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2013-07-10 13:45:47 +02:00
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section `BATCH OUTPUT` below for details.
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2008-04-23 21:17:46 +02:00
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2015-06-22 12:45:59 +02:00
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--batch-all-objects::
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Instead of reading a list of objects on stdin, perform the
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requested batch operation on all objects in the repository and
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any alternate object stores (not just reachable objects).
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Requires `--batch` or `--batch-check` be specified. Note that
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2015-06-22 13:06:32 +02:00
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the objects are visited in order sorted by their hashes.
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2015-06-22 12:45:59 +02:00
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2015-06-22 12:45:17 +02:00
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--buffer::
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Normally batch output is flushed after each object is output, so
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that a process can interactively read and write from
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`cat-file`. With this option, the output uses normal stdio
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buffering; this is much more efficient when invoking
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`--batch-check` on a large number of objects.
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cat-file: support "unordered" output for --batch-all-objects
If you're going to access the contents of every object in a
packfile, it's generally much more efficient to do so in
pack order, rather than in hash order. That increases the
locality of access within the packfile, which in turn is
friendlier to the delta base cache, since the packfile puts
related deltas next to each other. By contrast, hash order
is effectively random, since the sha1 has no discernible
relationship to the content.
This patch introduces an "--unordered" option to cat-file
which iterates over packs in pack-order under the hood. You
can see the results when dumping all of the file content:
$ time ./git cat-file --batch-all-objects --buffer --batch | wc -c
6883195596
real 0m44.491s
user 0m42.902s
sys 0m5.230s
$ time ./git cat-file --unordered \
--batch-all-objects --buffer --batch | wc -c
6883195596
real 0m6.075s
user 0m4.774s
sys 0m3.548s
Same output, different order, way faster. The same speed-up
applies even if you end up accessing the object content in a
different process, like:
git cat-file --batch-all-objects --buffer --batch-check |
grep blob |
git cat-file --batch='%(objectname) %(rest)' |
wc -c
Adding "--unordered" to the first command drops the runtime
in git.git from 24s to 3.5s.
Side note: there are actually further speedups available
for doing it all in-process now. Since we are outputting
the object content during the actual pack iteration, we
know where to find the object and could skip the extra
lookup done by oid_object_info(). This patch stops short
of that optimization since the underlying API isn't ready
for us to make those sorts of direct requests.
So if --unordered is so much better, why not make it the
default? Two reasons:
1. We've promised in the documentation that --batch-all-objects
outputs in hash order. Since cat-file is plumbing,
people may be relying on that default, and we can't
change it.
2. It's actually _slower_ for some cases. We have to
compute the pack revindex to walk in pack order. And
our de-duplication step uses an oidset, rather than a
sort-and-dedup, which can end up being more expensive.
If we're just accessing the type and size of each
object, for example, like:
git cat-file --batch-all-objects --buffer --batch-check
my best-of-five warm cache timings go from 900ms to
1100ms using --unordered. Though it's possible in a
cold-cache or under memory pressure that we could do
better, since we'd have better locality within the
packfile.
And one final question: why is it "--unordered" and not
"--pack-order"? The answer is again two-fold:
1. "pack order" isn't a well-defined thing across the
whole set of objects. We're hitting loose objects, as
well as objects in multiple packs, and the only
ordering we're promising is _within_ a single pack. The
rest is apparently random.
2. The point here is optimization. So we don't want to
promise any particular ordering, but only to say that
we will choose an ordering which is likely to be
efficient for accessing the object content. That leaves
the door open for further changes in the future without
having to add another compatibility option.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-08-11 01:24:57 +02:00
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--unordered::
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When `--batch-all-objects` is in use, visit objects in an
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order which may be more efficient for accessing the object
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contents than hash order. The exact details of the order are
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unspecified, but if you do not require a specific order, this
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should generally result in faster output, especially with
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`--batch`. Note that `cat-file` will still show each object
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only once, even if it is stored multiple times in the
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repository.
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2015-05-03 16:30:01 +02:00
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--allow-unknown-type::
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Allow -s or -t to query broken/corrupt objects of unknown type.
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2015-05-20 19:03:40 +02:00
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--follow-symlinks::
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With --batch or --batch-check, follow symlinks inside the
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repository when requesting objects with extended SHA-1
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expressions of the form tree-ish:path-in-tree. Instead of
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providing output about the link itself, provide output about
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the linked-to object. If a symlink points outside the
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tree-ish (e.g. a link to /foo or a root-level link to ../foo),
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the portion of the link which is outside the tree will be
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printed.
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+
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This option does not (currently) work correctly when an object in the
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index is specified (e.g. `:link` instead of `HEAD:link`) rather than
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one in the tree.
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+
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This option cannot (currently) be used unless `--batch` or
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`--batch-check` is used.
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+
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For example, consider a git repository containing:
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--
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f: a file containing "hello\n"
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link: a symlink to f
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dir/link: a symlink to ../f
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plink: a symlink to ../f
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alink: a symlink to /etc/passwd
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--
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+
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For a regular file `f`, `echo HEAD:f | git cat-file --batch` would print
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+
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--
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ce013625030ba8dba906f756967f9e9ca394464a blob 6
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--
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+
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And `echo HEAD:link | git cat-file --batch --follow-symlinks` would
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print the same thing, as would `HEAD:dir/link`, as they both point at
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`HEAD:f`.
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+
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Without `--follow-symlinks`, these would print data about the symlink
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itself. In the case of `HEAD:link`, you would see
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+
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--
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4d1ae35ba2c8ec712fa2a379db44ad639ca277bd blob 1
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--
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+
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Both `plink` and `alink` point outside the tree, so they would
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respectively print:
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+
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--
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symlink 4
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../f
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symlink 11
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/etc/passwd
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--
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2005-05-10 23:32:30 +02:00
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OUTPUT
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------
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2016-06-28 13:40:10 +02:00
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If `-t` is specified, one of the <type>.
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2005-12-04 02:57:48 +01:00
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2016-06-28 13:40:10 +02:00
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If `-s` is specified, the size of the <object> in bytes.
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2005-12-04 02:57:48 +01:00
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2018-01-10 13:55:53 +01:00
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If `-e` is specified, no output, unless the <object> is malformed.
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2005-05-10 23:32:30 +02:00
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2016-06-28 13:40:10 +02:00
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If `-p` is specified, the contents of <object> are pretty-printed.
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2006-05-25 03:22:32 +02:00
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2008-04-23 21:17:46 +02:00
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If <type> is specified, the raw (though uncompressed) contents of the <object>
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will be returned.
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2013-07-10 13:45:47 +02:00
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BATCH OUTPUT
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------------
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If `--batch` or `--batch-check` is given, `cat-file` will read objects
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cat-file: only split on whitespace when %(rest) is used
Commit c334b87b (cat-file: split --batch input lines on whitespace,
2013-07-11) taught `cat-file --batch-check` to split input lines on
the first whitespace, and stash everything after the first token
into the %(rest) output format element. It claimed:
Object names cannot contain spaces, so any input with
spaces would have resulted in a "missing" line.
But that is not correct. Refs, object sha1s, and various peeling
suffixes cannot contain spaces, but some object names can. In
particular:
1. Tree paths like "[<tree>]:path with whitespace"
2. Reflog specifications like "@{2 days ago}"
3. Commit searches like "rev^{/grep me}" or ":/grep me"
To remain backwards compatible, we cannot split on whitespace by
default, hence we will ship 1.8.4 with the commit reverted.
Resurrect its attempt but in a weaker form; only do the splitting
when "%(rest)" is used in the output format. Since that element did
not exist at all before c334b87, old scripts cannot be affected.
The existence of object names with spaces does mean that you
cannot reliably do:
echo ":path with space and other data" |
git cat-file --batch-check="%(objectname) %(rest)"
as it would split the path and feed only ":path" to get_sha1. But
that command is nonsensical. If you wanted to see "and other data"
in "%(rest)", git cannot possibly know where the filename ends and
the "rest" begins.
It might be more robust to have something like "-z" to separate the
input elements. But this patch is still a reasonable step before
having that. It makes the easy cases easy; people who do not care
about %(rest) do not have to consider it, and the %(rest) code
handles the spaces and newlines of "rev-list --objects" correctly.
Hard cases remain hard but possible (if you might get whitespace in
your input, you do not get to use %(rest) and must split and join
the output yourself using more flexible tools). And most
importantly, it does not preclude us from having different splitting
rules later if a "-z" (or similar) option is added. So we can make
the hard cases easier later, if we choose to.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-08-02 13:59:07 +02:00
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from stdin, one per line, and print information about them. By default,
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the whole line is considered as an object, as if it were fed to
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linkgit:git-rev-parse[1].
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2013-07-10 13:45:47 +02:00
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You can specify the information shown for each object by using a custom
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`<format>`. The `<format>` is copied literally to stdout for each
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object, with placeholders of the form `%(atom)` expanded, followed by a
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newline. The available atoms are:
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`objectname`::
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The 40-hex object name of the object.
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`objecttype`::
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2017-09-13 00:58:39 +02:00
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The type of the object (the same as `cat-file -t` reports).
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2013-07-10 13:45:47 +02:00
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`objectsize`::
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The size, in bytes, of the object (the same as `cat-file -s`
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reports).
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2013-07-10 13:46:25 +02:00
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`objectsize:disk`::
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The size, in bytes, that the object takes up on disk. See the
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note about on-disk sizes in the `CAVEATS` section below.
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2013-12-21 15:25:22 +01:00
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`deltabase`::
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If the object is stored as a delta on-disk, this expands to the
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40-hex sha1 of the delta base object. Otherwise, expands to the
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null sha1 (40 zeroes). See `CAVEATS` below.
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cat-file: only split on whitespace when %(rest) is used
Commit c334b87b (cat-file: split --batch input lines on whitespace,
2013-07-11) taught `cat-file --batch-check` to split input lines on
the first whitespace, and stash everything after the first token
into the %(rest) output format element. It claimed:
Object names cannot contain spaces, so any input with
spaces would have resulted in a "missing" line.
But that is not correct. Refs, object sha1s, and various peeling
suffixes cannot contain spaces, but some object names can. In
particular:
1. Tree paths like "[<tree>]:path with whitespace"
2. Reflog specifications like "@{2 days ago}"
3. Commit searches like "rev^{/grep me}" or ":/grep me"
To remain backwards compatible, we cannot split on whitespace by
default, hence we will ship 1.8.4 with the commit reverted.
Resurrect its attempt but in a weaker form; only do the splitting
when "%(rest)" is used in the output format. Since that element did
not exist at all before c334b87, old scripts cannot be affected.
The existence of object names with spaces does mean that you
cannot reliably do:
echo ":path with space and other data" |
git cat-file --batch-check="%(objectname) %(rest)"
as it would split the path and feed only ":path" to get_sha1. But
that command is nonsensical. If you wanted to see "and other data"
in "%(rest)", git cannot possibly know where the filename ends and
the "rest" begins.
It might be more robust to have something like "-z" to separate the
input elements. But this patch is still a reasonable step before
having that. It makes the easy cases easy; people who do not care
about %(rest) do not have to consider it, and the %(rest) code
handles the spaces and newlines of "rev-list --objects" correctly.
Hard cases remain hard but possible (if you might get whitespace in
your input, you do not get to use %(rest) and must split and join
the output yourself using more flexible tools). And most
importantly, it does not preclude us from having different splitting
rules later if a "-z" (or similar) option is added. So we can make
the hard cases easier later, if we choose to.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-08-02 13:59:07 +02:00
|
|
|
`rest`::
|
|
|
|
If this atom is used in the output string, input lines are split
|
|
|
|
at the first whitespace boundary. All characters before that
|
|
|
|
whitespace are considered to be the object name; characters
|
|
|
|
after that first run of whitespace (i.e., the "rest" of the
|
|
|
|
line) are output in place of the `%(rest)` atom.
|
|
|
|
|
2013-07-10 13:45:47 +02:00
|
|
|
If no format is specified, the default format is `%(objectname)
|
|
|
|
%(objecttype) %(objectsize)`.
|
|
|
|
|
|
|
|
If `--batch` is specified, the object information is followed by the
|
|
|
|
object contents (consisting of `%(objectsize)` bytes), followed by a
|
|
|
|
newline.
|
|
|
|
|
|
|
|
For example, `--batch` without a custom format would produce:
|
2008-04-23 21:17:47 +02:00
|
|
|
|
|
|
|
------------
|
|
|
|
<sha1> SP <type> SP <size> LF
|
|
|
|
<contents> LF
|
|
|
|
------------
|
|
|
|
|
2013-07-10 13:45:47 +02:00
|
|
|
Whereas `--batch-check='%(objectname) %(objecttype)'` would produce:
|
2008-04-23 21:17:46 +02:00
|
|
|
|
|
|
|
------------
|
2013-07-10 13:45:47 +02:00
|
|
|
<sha1> SP <type> LF
|
2008-04-23 21:17:46 +02:00
|
|
|
------------
|
|
|
|
|
2013-07-10 13:45:47 +02:00
|
|
|
If a name is specified on stdin that cannot be resolved to an object in
|
|
|
|
the repository, then `cat-file` will ignore any custom format and print:
|
2005-05-10 23:32:30 +02:00
|
|
|
|
2008-04-23 21:17:46 +02:00
|
|
|
------------
|
|
|
|
<object> SP missing LF
|
|
|
|
------------
|
2005-05-10 23:32:30 +02:00
|
|
|
|
2019-01-18 05:19:43 +01:00
|
|
|
If a name is specified that might refer to more than one object (an ambiguous short sha), then `cat-file` will ignore any custom format and print:
|
|
|
|
|
|
|
|
------------
|
|
|
|
<object> SP ambiguous LF
|
|
|
|
------------
|
|
|
|
|
2015-05-20 19:03:40 +02:00
|
|
|
If --follow-symlinks is used, and a symlink in the repository points
|
|
|
|
outside the repository, then `cat-file` will ignore any custom format
|
|
|
|
and print:
|
|
|
|
|
|
|
|
------------
|
|
|
|
symlink SP <size> LF
|
|
|
|
<symlink> LF
|
|
|
|
------------
|
|
|
|
|
|
|
|
The symlink will either be absolute (beginning with a /), or relative
|
|
|
|
to the tree root. For instance, if dir/link points to ../../foo, then
|
|
|
|
<symlink> will be ../foo. <size> is the size of the symlink in bytes.
|
|
|
|
|
|
|
|
If --follow-symlinks is used, the following error messages will be
|
|
|
|
displayed:
|
|
|
|
|
|
|
|
------------
|
|
|
|
<object> SP missing LF
|
|
|
|
------------
|
|
|
|
is printed when the initial symlink requested does not exist.
|
|
|
|
|
|
|
|
------------
|
|
|
|
dangling SP <size> LF
|
|
|
|
<object> LF
|
|
|
|
------------
|
|
|
|
is printed when the initial symlink exists, but something that
|
|
|
|
it (transitive-of) points to does not.
|
|
|
|
|
|
|
|
------------
|
|
|
|
loop SP <size> LF
|
|
|
|
<object> LF
|
|
|
|
------------
|
|
|
|
is printed for symlink loops (or any symlinks that
|
|
|
|
require more than 40 link resolutions to resolve).
|
|
|
|
|
|
|
|
------------
|
|
|
|
notdir SP <size> LF
|
|
|
|
<object> LF
|
|
|
|
------------
|
|
|
|
is printed when, during symlink resolution, a file is used as a
|
|
|
|
directory name.
|
2013-07-10 13:46:25 +02:00
|
|
|
|
|
|
|
CAVEATS
|
|
|
|
-------
|
|
|
|
|
|
|
|
Note that the sizes of objects on disk are reported accurately, but care
|
|
|
|
should be taken in drawing conclusions about which refs or objects are
|
|
|
|
responsible for disk usage. The size of a packed non-delta object may be
|
|
|
|
much larger than the size of objects which delta against it, but the
|
|
|
|
choice of which object is the base and which is the delta is arbitrary
|
2013-12-21 15:25:22 +01:00
|
|
|
and is subject to change during a repack.
|
2013-07-10 13:46:25 +02:00
|
|
|
|
2013-12-21 15:25:22 +01:00
|
|
|
Note also that multiple copies of an object may be present in the object
|
|
|
|
database; in this case, it is undefined which copy's size or delta base
|
|
|
|
will be reported.
|
2013-07-10 13:46:25 +02:00
|
|
|
|
2005-05-10 23:32:30 +02:00
|
|
|
GIT
|
|
|
|
---
|
2008-06-06 09:07:32 +02:00
|
|
|
Part of the linkgit:git[1] suite
|