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c334b87b30
If we get an input line to --batch or --batch-check that looks like "HEAD foo bar", we will currently feed the whole thing to get_sha1(). This means that to use --batch-check with `rev-list --objects`, one must pre-process the input, like: git rev-list --objects HEAD | cut -d' ' -f1 | git cat-file --batch-check Besides being more typing and slightly less efficient to invoke `cut`, the result loses information: we no longer know which path each object was found at. This patch teaches cat-file to split input lines at the first whitespace. Everything to the left of the whitespace is considered an object name, and everything to the right is made available as the %(reset) atom. So you can now do: git rev-list --objects HEAD | git cat-file --batch-check='%(objectsize) %(rest)' to collect object sizes at particular paths. Even if %(rest) is not used, we always do the whitespace split (which means you can simply eliminate the `cut` command from the first example above). This whitespace split is backwards compatible for any reasonable input. Object names cannot contain spaces, so any input with spaces would have resulted in a "missing" line. The only input hurt is if somebody really expected input of the form "HEAD is a fine-looking ref!" to fail; it will now parse HEAD, and make "is a fine-looking ref!" available as %(rest). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
163 lines
4.9 KiB
Plaintext
163 lines
4.9 KiB
Plaintext
git-cat-file(1)
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===============
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NAME
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----
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git-cat-file - Provide content or type and size information for repository objects
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SYNOPSIS
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--------
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[verse]
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'git cat-file' (-t | -s | -e | -p | <type> | --textconv ) <object>
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'git cat-file' (--batch | --batch-check) < <list-of-objects>
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DESCRIPTION
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-----------
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In its first form, the command provides the content or the type of an object in
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the repository. The type is required unless '-t' or '-p' is used to find the
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object type, or '-s' is used to find the object size, or '--textconv' is used
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(which implies type "blob").
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In the second form, a list of objects (separated by linefeeds) is provided on
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stdin, and the SHA-1, type, and size of each object is printed on stdout.
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OPTIONS
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-------
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<object>::
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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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the "SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
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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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-s::
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Instead of the content, show the object size identified by
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<object>.
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-e::
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Suppress all output; instead exit with zero status if <object>
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exists and is a valid object.
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-p::
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Pretty-print the contents of <object> based on its type.
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<type>::
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Typically this matches the real type of <object> but asking
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for a type that can trivially be dereferenced from the given
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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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--textconv::
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Show the content as transformed by a textconv filter. In this case,
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<object> has be of the form <treeish>:<path>, or :<path> in order
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to apply the filter to the content recorded in the index at <path>.
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--batch::
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--batch=<format>::
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Print object information and contents for each object provided
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on stdin. May not be combined with any other options or arguments.
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See the section `BATCH OUTPUT` below for details.
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--batch-check::
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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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not be combined with any other options or arguments. See the
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section `BATCH OUTPUT` below for details.
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OUTPUT
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------
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If '-t' is specified, one of the <type>.
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If '-s' is specified, the size of the <object> in bytes.
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If '-e' is specified, no output.
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If '-p' is specified, the contents of <object> are pretty-printed.
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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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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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from stdin, one per line, and print information about them.
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Each line is split at the first whitespace boundary. All characters
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before that whitespace are considered as a whole object name, and are
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parsed as if given to linkgit:git-rev-parse[1]. Characters after that
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whitespace can be accessed using the `%(rest)` atom (see below).
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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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The type of of the object (the same as `cat-file -t` reports).
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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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`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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`rest`::
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The text (if any) found after the first run of whitespace on the
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input line (i.e., the "rest" of the line).
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If no format is specified, the default format is `%(objectname)
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%(objecttype) %(objectsize)`.
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If `--batch` is specified, the object information is followed by the
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object contents (consisting of `%(objectsize)` bytes), followed by a
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newline.
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For example, `--batch` without a custom format would produce:
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------------
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<sha1> SP <type> SP <size> LF
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<contents> LF
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------------
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Whereas `--batch-check='%(objectname) %(objecttype)'` would produce:
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------------
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<sha1> SP <type> LF
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------------
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If a name is specified on stdin that cannot be resolved to an object in
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the repository, then `cat-file` will ignore any custom format and print:
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------------
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<object> SP missing LF
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------------
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CAVEATS
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-------
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Note that the sizes of objects on disk are reported accurately, but care
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should be taken in drawing conclusions about which refs or objects are
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responsible for disk usage. The size of a packed non-delta object may be
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much larger than the size of objects which delta against it, but the
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choice of which object is the base and which is the delta is arbitrary
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and is subject to change during a repack. Note also that multiple copies
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of an object may be present in the object database; in this case, it is
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undefined which copy's size will be reported.
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GIT
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---
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Part of the linkgit:git[1] suite
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