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