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.
236 lines
7.8 KiB
236 lines
7.8 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 is |
|
compared differs: |
|
|
|
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 index. |
|
|
|
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 index 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 a file is new on the filesystem |
|
and it is out of sync with the index. |
|
|
|
Example: |
|
|
|
------------------------------------------------ |
|
:100644 100644 5be4a4...... 000000...... M file.c |
|
------------------------------------------------ |
|
|
|
When `-z` option is not used, TAB, LF, and backslash characters |
|
in pathnames are represented as `\t`, `\n`, and `\\`, |
|
respectively. |
|
|
|
diff format for merges |
|
---------------------- |
|
|
|
"git-diff-tree" and "git-diff-files" can take '-c' or '--cc' option |
|
to generate diff output also for merge commits. The output differs |
|
from the format described above in the following way: |
|
|
|
. there is a colon for each parent |
|
. there are more "src" modes and "src" sha1 |
|
. status is concatenated status characters for each parent |
|
. no optional "score" number |
|
. single path, only for "dst" |
|
|
|
Example: |
|
|
|
------------------------------------------------ |
|
::100644 100644 100644 fabadb8... cc95eb0... 4866510... MM describe.c |
|
------------------------------------------------ |
|
|
|
Note that 'combined diff' lists only files which were modified from |
|
all parents. |
|
|
|
|
|
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. You can customize the creation |
|
of such patches via the GIT_EXTERNAL_DIFF and the GIT_DIFF_OPTS |
|
environment variables. |
|
|
|
What the -p option produces is slightly different from the traditional |
|
diff format. |
|
|
|
1. It is preceded 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` show 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 one or more extended header lines: |
|
|
|
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> |
|
index <hash>..<hash> <mode> |
|
|
|
3. TAB, LF, double quote and backslash characters in pathnames |
|
are represented as `\t`, `\n`, `\"` and `\\`, respectively. |
|
If there is need for such substitution then the whole |
|
pathname is put in double quotes. |
|
|
|
|
|
combined diff format |
|
-------------------- |
|
|
|
git-diff-tree and git-diff-files can take '-c' or '--cc' option |
|
to produce 'combined diff', which looks like this: |
|
|
|
------------ |
|
diff --combined describe.c |
|
index fabadb8,cc95eb0..4866510 |
|
--- a/describe.c |
|
+++ b/describe.c |
|
@@@ -98,20 -98,12 +98,20 @@@ |
|
return (a_date > b_date) ? -1 : (a_date == b_date) ? 0 : 1; |
|
} |
|
|
|
- static void describe(char *arg) |
|
-static void describe(struct commit *cmit, int last_one) |
|
++static void describe(char *arg, int last_one) |
|
{ |
|
+ unsigned char sha1[20]; |
|
+ struct commit *cmit; |
|
struct commit_list *list; |
|
static int initialized = 0; |
|
struct commit_name *n; |
|
|
|
+ if (get_sha1(arg, sha1) < 0) |
|
+ usage(describe_usage); |
|
+ cmit = lookup_commit_reference(sha1); |
|
+ if (!cmit) |
|
+ usage(describe_usage); |
|
+ |
|
if (!initialized) { |
|
initialized = 1; |
|
for_each_ref(get_name); |
|
------------ |
|
|
|
1. It is preceded with a "git diff" header, that looks like |
|
this (when '-c' option is used): |
|
|
|
diff --combined file |
|
+ |
|
or like this (when '--cc' option is used): |
|
|
|
diff --c file |
|
|
|
2. It is followed by one or more extended header lines |
|
(this example shows a merge with two parents): |
|
|
|
index <hash>,<hash>..<hash> |
|
mode <mode>,<mode>..<mode> |
|
new file mode <mode> |
|
deleted file mode <mode>,<mode> |
|
+ |
|
The `mode <mode>,<mode>..<mode>` line appears only if at least one of |
|
the <mode> is different from the rest. Extended headers with |
|
information about detected contents movement (renames and |
|
copying detection) are designed to work with diff of two |
|
<tree-ish> and are not used by combined diff format. |
|
|
|
3. It is followed by two-line from-file/to-file header |
|
|
|
--- a/file |
|
+++ b/file |
|
+ |
|
Similar to two-line header for traditional 'unified' diff |
|
format, `/dev/null` is used to signal created or deleted |
|
files. |
|
|
|
4. Chunk header format is modified to prevent people from |
|
accidentally feeding it to `patch -p1`. Combined diff format |
|
was created for review of merge commit changes, and was not |
|
meant for apply. The change is similar to the change in the |
|
extended 'index' header: |
|
|
|
@@@ <from-file-range> <from-file-range> <to-file-range> @@@ |
|
+ |
|
There are (number of parents + 1) `@` characters in the chunk |
|
header for combined diff format. |
|
|
|
Unlike the traditional 'unified' diff format, which shows two |
|
files A and B with a single column that has `-` (minus -- |
|
appears in A but removed in B), `+` (plus -- missing in A but |
|
added to B), or `" "` (space -- unchanged) prefix, this format |
|
compares two or more files file1, file2,... with one file X, and |
|
shows how X differs from each of fileN. One column for each of |
|
fileN is prepended to the output line to note how X's line is |
|
different from it. |
|
|
|
A `-` character in the column N means that the line appears in |
|
fileN but it does not appear in the result. A `+` character |
|
in the column N means that the line appears in the last file, |
|
and fileN does not have that line (in other words, the line was |
|
added, from the point of view of that parent). |
|
|
|
In the above example output, the function signature was changed |
|
from both files (hence two `-` removals from both file1 and |
|
file2, plus `++` to mean one line that was added does not appear |
|
in either file1 nor file2). Also two other lines are the same |
|
from file1 but do not appear in file2 (hence prefixed with ` +`). |
|
|
|
When shown by `git diff-tree -c`, it compares the parents of a |
|
merge commit with the merge result (i.e. file1..fileN are the |
|
parents). When shown by `git diff-files -c`, it compares the |
|
two unresolved merge parents with the working tree file |
|
(i.e. file1 is stage 2 aka "our version", file2 is stage 3 aka |
|
"their version"). |
|
|
|
|