FM / git

/usr/share/doc/git

Name	Size	Mode	Actions
contrib/	-	0755	rm
howto/	-	0755	rm
RelNotes/	-	0755	rm
technical/	-	0755	rm
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Edit: /usr/share/doc/git/git-cat-file.txt (13615B)

git-cat-file(1)
===============

NAME
----
git-cat-file - Provide contents or details of repository objects

DESCRIPTION
-----------
Output the contents or other properties such as size, type or delta
information of one or more objects.

This command can operate in two modes, depending on whether an option
from the `--batch` family is specified.

In non-batch mode, the command provides information on an object
named on the command line.

In batch mode, arguments are read from standard input.

OPTIONS
-------
<object>::
	The name of the object to show.
	For a more complete list of ways to spell object names, see
	the "SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].

-t::
	Instead of the content, show the object type identified by
	`<object>`.

-s::
	Instead of the content, show the object size identified by
	`<object>`. If used with `--use-mailmap` option, will show
	the size of updated object after replacing idents using the
	mailmap mechanism.

-e::
	Exit with zero status if `<object>` exists and is a valid
	object. If `<object>` is of an invalid format, exit with non-zero
	status and emit an error on stderr.

-p::
	Pretty-print the contents of `<object>` based on its type.

<type>::
	Typically this matches the real type of `<object>` but asking
	for a type that can trivially be dereferenced from the given
	`<object>` is also permitted.  An example is to ask for a
	"tree" with `<object>` being a commit object that contains it,
	or to ask for a "blob" with `<object>` being a tag object that
	points at it.

--[no-]mailmap::
--[no-]use-mailmap::
       Use mailmap file to map author, committer and tagger names
       and email addresses to canonical real names and email addresses.
       See linkgit:git-shortlog[1].

--textconv::
	Show the content as transformed by a textconv filter. In this case,
	`<object>` has to be of the form `<tree-ish>:<path>`, or `:<path>` in
	order to apply the filter to the content recorded in the index at
	`<path>`.

--filters::
	Show the content as converted 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>`.

--path=<path>::
	For use with `--textconv` or `--filters`, to allow specifying an object
	name and a path separately, e.g. when it is difficult to figure out
	the revision from which the blob came.

--batch::
--batch=<format>::
	Print object information and contents for each object provided
	on stdin. May not be combined with any other options or arguments
	except `--textconv`, `--filters`, or `--use-mailmap`.
+
--
	* When used with `--textconv` or `--filters`, the input lines
	  must specify the path, separated by whitespace. See the section
	  `BATCH OUTPUT` below for details.

* When used with `--use-mailmap`, for commit and tag objects, the
	  contents part of the output shows the identities replaced using the
	  mailmap mechanism, while the information part of the output shows
	  the size of the object as if it actually recorded the replacement
	  identities.
--

--batch-check::
--batch-check=<format>::
	Print object information for each object provided on stdin. May not be
	combined with any other options or arguments except `--textconv`, `--filters`
	or `--use-mailmap`.
+
--
	* When used with `--textconv` or `--filters`, the input lines must
	 specify the path, separated by whitespace. See the section
	 `BATCH OUTPUT` below for details.

* When used with `--use-mailmap`, for commit and tag objects, the
	  printed object information shows the size of the object as if the
	  identities recorded in it were replaced by the mailmap mechanism.
--

--batch-command::
--batch-command=<format>::
	Enter a command mode that reads commands and arguments from stdin. May
	only be combined with `--buffer`, `--textconv`, `--use-mailmap` or
	`--filters`.
+
--
	* When used with `--textconv` or `--filters`, the input lines must
	  specify the path, separated by whitespace. See the section
	  `BATCH OUTPUT` below for details.

* When used with `--use-mailmap`, for commit and tag objects, the
	  `contents` command shows the identities replaced using the
	  mailmap mechanism, while the `info` command shows the size
	  of the object as if it actually recorded the replacement
	  identities.
--
+
`--batch-command` recognizes the following commands:
+
--
contents <object>::
	Print object contents for object reference `<object>`. This corresponds to
	the output of `--batch`.

info <object>::
	Print object info for object reference `<object>`. This corresponds to the
	output of `--batch-check`.

flush::
	Used with `--buffer` to execute all preceding commands that were issued
	since the beginning or since the last flush was issued. When `--buffer`
	is used, no output will come until a `flush` is issued. When `--buffer`
	is not used, commands are flushed each time without issuing `flush`.
--
+

--batch-all-objects::
	Instead of reading a list of objects on stdin, perform the
	requested batch operation on all objects in the repository and
	any alternate object stores (not just reachable objects).
	Requires `--batch` or `--batch-check` be specified. By default,
	the objects are visited in order sorted by their hashes; see
	also `--unordered` below. Objects are presented as-is, without
	respecting the "replace" mechanism of linkgit:git-replace[1].

--buffer::
	Normally batch output is flushed after each object is output, so
	that a process can interactively read and write from
	`cat-file`. With this option, the output uses normal stdio
	buffering; this is much more efficient when invoking
	`--batch-check` or `--batch-command` on a large number of objects.

--unordered::
	When `--batch-all-objects` is in use, visit objects in an
	order which may be more efficient for accessing the object
	contents than hash order. The exact details of the order are
	unspecified, but if you do not require a specific order, this
	should generally result in faster output, especially with
	`--batch`.  Note that `cat-file` will still show each object
	only once, even if it is stored multiple times in the
	repository.

--allow-unknown-type::
	Allow `-s` or `-t` to query broken/corrupt objects of unknown type.

--follow-symlinks::
	With `--batch` or `--batch-check`, follow symlinks inside the
	repository when requesting objects with extended SHA-1
	expressions of the form tree-ish:path-in-tree.  Instead of
	providing output about the link itself, provide output about
	the linked-to object.  If a symlink points outside the
	tree-ish (e.g. a link to `/foo` or a root-level link to `../foo`),
	the portion of the link which is outside the tree will be
	printed.
+
This option does not (currently) work correctly when an object in the
index is specified (e.g. `:link` instead of `HEAD:link`) rather than
one in the tree.
+
This option cannot (currently) be used unless `--batch` or
`--batch-check` is used.
+
For example, consider a git repository containing:
+
--
	f: a file containing "hello\n"
	link: a symlink to f
	dir/link: a symlink to ../f
	plink: a symlink to ../f
	alink: a symlink to /etc/passwd
--
+
For a regular file `f`, `echo HEAD:f | git cat-file --batch` would print
+
--
	ce013625030ba8dba906f756967f9e9ca394464a blob 6
--
+
And `echo HEAD:link | git cat-file --batch --follow-symlinks` would
print the same thing, as would `HEAD:dir/link`, as they both point at
`HEAD:f`.
+
Without `--follow-symlinks`, these would print data about the symlink
itself.  In the case of `HEAD:link`, you would see
+
--
	4d1ae35ba2c8ec712fa2a379db44ad639ca277bd blob 1
--
+
Both `plink` and `alink` point outside the tree, so they would
respectively print:
+
--
	symlink 4
	../f

symlink 11
	/etc/passwd
--

-Z::
	Only meaningful with `--batch`, `--batch-check`, or
	`--batch-command`; input and output is NUL-delimited instead of
	newline-delimited.

-z::
	Only meaningful with `--batch`, `--batch-check`, or
	`--batch-command`; input is NUL-delimited instead of
	newline-delimited. This option is deprecated in favor of
	`-Z` as the output can otherwise be ambiguous.

OUTPUT
------
If `-t` is specified, one of the `<type>`.

If `-s` is specified, the size of the `<object>` in bytes.

If `-e` is specified, no output, unless the `<object>` is malformed.

If `-p` is specified, the contents of `<object>` are pretty-printed.

If `<type>` is specified, the raw (though uncompressed) contents of the `<object>`
will be returned.

BATCH OUTPUT
------------

If `--batch` or `--batch-check` is given, `cat-file` will read objects
from stdin, one per line, and print information about them. By default,
the whole line is considered as an object, as if it were fed to
linkgit:git-rev-parse[1].

When `--batch-command` is given, `cat-file` will read commands from stdin,
one per line, and print information based on the command given. With
`--batch-command`, the `info` command followed by an object will print
information about the object the same way `--batch-check` would, and the
`contents` command followed by an object prints contents in the same way
`--batch` would.

You can specify the information shown for each object by using a custom
`<format>`. The `<format>` is copied literally to stdout for each
object, with placeholders of the form `%(atom)` expanded, followed by a
newline. The available atoms are:

`objectname`::
	The full hex representation of the object name.

`objecttype`::
	The type of the object (the same as `cat-file -t` reports).

`objectsize`::
	The size, in bytes, of the object (the same as `cat-file -s`
	reports).

`objectsize:disk`::
	The size, in bytes, that the object takes up on disk. See the
	note about on-disk sizes in the `CAVEATS` section below.

`deltabase`::
	If the object is stored as a delta on-disk, this expands to the
	full hex representation of the delta base object name.
	Otherwise, expands to the null OID (all zeroes). See `CAVEATS`
	below.

`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.

If no format is specified, the default format is `%(objectname)
%(objecttype) %(objectsize)`.

If `--batch` is specified, or if `--batch-command` is used with the `contents`
command, 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:

------------
<oid> SP <type> SP <size> LF
<contents> LF
------------

Whereas `--batch-check='%(objectname) %(objecttype)'` would produce:

------------
<oid> SP <type> LF
------------

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:

------------
<object> SP missing LF
------------

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
------------

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.

Alternatively, when `-Z` is passed, the line feeds in any of the above examples
are replaced with NUL terminators. This ensures that output will be parsable if
the output itself would contain a linefeed and is thus recommended for
scripting purposes.

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
and is subject to change during a repack.

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.

GIT
---
Part of the linkgit:git[1] suite

git-cat-file(1) =============== NAME ---- git-cat-file - Provide contents or details of repository objects SYNOPSIS -------- [verse] 'git cat-file'