You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
140 lines
4.5 KiB
140 lines
4.5 KiB
The output format from "git-diff-index", "git-diff-tree" and |
|
"git-diff-files" are very similar. |
|
|
|
These commands all compare two sets of things; what are |
|
compared are different: |
|
|
|
git-diff-index <tree-ish>:: |
|
compares the <tree-ish> and the files on the filesystem. |
|
|
|
git-diff-index --cached <tree-ish>:: |
|
compares the <tree-ish> and the cache. |
|
|
|
git-diff-tree [-r] <tree-ish-1> <tree-ish-2> [<pattern>...]:: |
|
compares the trees named by the two arguments. |
|
|
|
git-diff-files [<pattern>...]:: |
|
compares the cache and the files on the filesystem. |
|
|
|
|
|
An output line is formatted this way: |
|
|
|
------------------------------------------------ |
|
in-place edit :100644 100644 bcd1234... 0123456... M file0 |
|
copy-edit :100644 100644 abcd123... 1234567... C68 file1 file2 |
|
rename-edit :100644 100644 abcd123... 1234567... R86 file1 file3 |
|
create :000000 100644 0000000... 1234567... A file4 |
|
delete :100644 000000 1234567... 0000000... D file5 |
|
unmerged :000000 000000 0000000... 0000000... U file6 |
|
------------------------------------------------ |
|
|
|
That is, from the left to the right: |
|
|
|
. a colon. |
|
. mode for "src"; 000000 if creation or unmerged. |
|
. a space. |
|
. mode for "dst"; 000000 if deletion or unmerged. |
|
. a space. |
|
. sha1 for "src"; 0\{40\} if creation or unmerged. |
|
. a space. |
|
. sha1 for "dst"; 0\{40\} if creation, unmerged or "look at work tree". |
|
. a space. |
|
. status, followed by optional "score" number. |
|
. a tab or a NUL when '-z' option is used. |
|
. path for "src" |
|
. a tab or a NUL when '-z' option is used; only exists for C or R. |
|
. path for "dst"; only exists for C or R. |
|
. an LF or a NUL when '-z' option is used, to terminate the record. |
|
|
|
<sha1> is shown as all 0's if new is a file on the filesystem |
|
and it is out of sync with the cache. |
|
|
|
Example: |
|
|
|
------------------------------------------------ |
|
:100644 100644 5be4a4...... 000000...... M file.c |
|
------------------------------------------------ |
|
|
|
Generating patches with -p |
|
-------------------------- |
|
|
|
When "git-diff-index", "git-diff-tree", or "git-diff-files" are run |
|
with a '-p' option, they do not produce the output described above; |
|
instead they produce a patch file. |
|
|
|
The patch generation can be customized at two levels. |
|
|
|
1. When the environment variable 'GIT_EXTERNAL_DIFF' is not set, |
|
these commands internally invoke "diff" like this: |
|
|
|
diff -L a/<path> -L b/<path> -pu <old> <new> |
|
+ |
|
For added files, `/dev/null` is used for <old>. For removed |
|
files, `/dev/null` is used for <new> |
|
+ |
|
The "diff" formatting options can be customized via the |
|
environment variable 'GIT_DIFF_OPTS'. For example, if you |
|
prefer context diff: |
|
|
|
GIT_DIFF_OPTS=-c git-diff-index -p $(cat .git/HEAD) |
|
|
|
|
|
2. When the environment variable 'GIT_EXTERNAL_DIFF' is set, the |
|
program named by it is called, instead of the diff invocation |
|
described above. |
|
+ |
|
For a path that is added, removed, or modified, |
|
'GIT_EXTERNAL_DIFF' is called with 7 parameters: |
|
|
|
path old-file old-hex old-mode new-file new-hex new-mode |
|
+ |
|
where: |
|
|
|
<old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the |
|
contents of <old|ne>, |
|
<old|new>-hex:: are the 40-hexdigit SHA1 hashes, |
|
<old|new>-mode:: are the octal representation of the file modes. |
|
|
|
+ |
|
The file parameters can point at the user's working file |
|
(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file` |
|
when a new file is added), or a temporary file (e.g. `old-file` in the |
|
cache). 'GIT_EXTERNAL_DIFF' should not worry about unlinking the |
|
temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits. |
|
|
|
For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1 |
|
parameter, <path>. |
|
|
|
|
|
Git specific extension to diff format |
|
------------------------------------- |
|
|
|
What -p option produces is slightly different from the |
|
traditional diff format. |
|
|
|
1. It is preceeded with a "git diff" header, that looks like |
|
this: |
|
|
|
diff --git a/file1 b/file2 |
|
+ |
|
The `a/` and `b/` filenames are the same unless rename/copy is |
|
involved. Especially, even for a creation or a deletion, |
|
`/dev/null` is _not_ used in place of `a/` or `b/` filenames. |
|
+ |
|
When rename/copy is involved, `file1` and `file2` shows the |
|
name of the source file of the rename/copy and the name of |
|
the file that rename/copy produces, respectively. |
|
|
|
2. It is followed by extended header lines that are one or |
|
more of: |
|
|
|
old mode <mode> |
|
new mode <mode> |
|
deleted file mode <mode> |
|
new file mode <mode> |
|
copy from <path> |
|
copy to <path> |
|
rename from <path> |
|
rename to <path> |
|
similarity index <number> |
|
dissimilarity index <number>
|
|
|