diff options
Diffstat (limited to 'Documentation/git-cat-file.txt')
| -rw-r--r-- | Documentation/git-cat-file.txt | 87 |
1 files changed, 75 insertions, 12 deletions
diff --git a/Documentation/git-cat-file.txt b/Documentation/git-cat-file.txt index 30d585af5d..f6a16f4300 100644 --- a/Documentation/git-cat-file.txt +++ b/Documentation/git-cat-file.txt @@ -54,16 +54,20 @@ OPTIONS --textconv:: Show the content as transformed by a textconv filter. In this case, - <object> has be of the form <treeish>:<path>, or :<path> in order + <object> has be of the form <tree-ish>:<path>, or :<path> in order to apply the filter to the content recorded in the index at <path>. --batch:: - Print the SHA-1, type, size, and contents of each object provided on - stdin. May not be combined with any other options or arguments. +--batch=<format>:: + Print object information and contents for each object provided + on stdin. May not be combined with any other options or arguments. + See the section `BATCH OUTPUT` below for details. --batch-check:: - Print the SHA-1, type, and size of each object provided on stdin. May not - be combined with any other options or arguments. +--batch-check=<format>:: + Print object information for each object provided on stdin. May + not be combined with any other options or arguments. See the + section `BATCH OUTPUT` below for details. OUTPUT ------ @@ -78,28 +82,87 @@ 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. -If '--batch' is specified, output of the following form is printed for each -object specified on stdin: +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]. + +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 40-hex object name of the object. + +`objecttype`:: + The type of 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 + 40-hex sha1 of the delta base object. Otherwise, expands to the + null sha1 (40 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, 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: ------------ <sha1> SP <type> SP <size> LF <contents> LF ------------ -If '--batch-check' is specified, output of the following form is printed for -each object specified on stdin: +Whereas `--batch-check='%(objectname) %(objecttype)'` would produce: ------------ -<sha1> SP <type> SP <size> LF +<sha1> SP <type> LF ------------ -For both '--batch' and '--batch-check', output of the following form is printed -for each object specified on stdin that does not exist in the repository: +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 ------------ + +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 |