6 static int ignore_merges
= 1;
7 static int recursive
= 0;
8 static int read_stdin
= 0;
9 static int line_termination
= '\n';
10 static int generate_patch
= 0;
11 static const char *header
= NULL
;
13 // What paths are we interested in?
14 static int nr_paths
= 0;
15 static char **paths
= NULL
;
16 static int *pathlens
= NULL
;
18 static int diff_tree_sha1(const unsigned char *old
, const unsigned char *new, const char *base
);
20 static void update_tree_entry(void **bufp
, unsigned long *sizep
)
23 unsigned long size
= *sizep
;
24 int len
= strlen(buf
) + 1 + 20;
27 die("corrupt tree file");
32 static const unsigned char *extract(void *tree
, unsigned long size
, const char **pathp
, unsigned int *modep
)
34 int len
= strlen(tree
)+1;
35 const unsigned char *sha1
= tree
+ len
;
36 const char *path
= strchr(tree
, ' ');
38 if (!path
|| size
< len
+ 20 || sscanf(tree
, "%o", modep
) != 1)
39 die("corrupt tree file");
44 static char *malloc_base(const char *base
, const char *path
, int pathlen
)
46 int baselen
= strlen(base
);
47 char *newbase
= xmalloc(baselen
+ pathlen
+ 2);
48 memcpy(newbase
, base
, baselen
);
49 memcpy(newbase
+ baselen
, path
, pathlen
);
50 memcpy(newbase
+ baselen
+ pathlen
, "/", 2);
54 static void show_file(const char *prefix
, void *tree
, unsigned long size
, const char *base
);
56 /* A whole sub-tree went away or appeared */
57 static void show_tree(const char *prefix
, void *tree
, unsigned long size
, const char *base
)
60 show_file(prefix
, tree
, size
, base
);
61 update_tree_entry(&tree
, &size
);
65 /* A file entry went away or appeared */
66 static void show_file(const char *prefix
, void *tree
, unsigned long size
, const char *base
)
70 const unsigned char *sha1
= extract(tree
, size
, &path
, &mode
);
80 if (recursive
&& S_ISDIR(mode
)) {
83 char *newbase
= malloc_base(base
, path
, strlen(path
));
86 tree
= read_sha1_file(sha1
, type
, &size
);
87 if (!tree
|| strcmp(type
, "tree"))
88 die("corrupt tree sha %s", sha1_to_hex(sha1
));
90 show_tree(prefix
, tree
, size
, newbase
);
99 diff_addremove(prefix
[0], mode
, sha1
, base
, path
);
102 printf("%s%06o\t%s\t%s\t%s%s%c", prefix
, mode
,
103 S_ISDIR(mode
) ? "tree" : "blob",
104 sha1_to_hex(sha1
), base
, path
,
108 static int compare_tree_entry(void *tree1
, unsigned long size1
, void *tree2
, unsigned long size2
, const char *base
)
110 unsigned mode1
, mode2
;
111 const char *path1
, *path2
;
112 const unsigned char *sha1
, *sha2
;
113 int cmp
, pathlen1
, pathlen2
;
114 char old_sha1_hex
[50];
116 sha1
= extract(tree1
, size1
, &path1
, &mode1
);
117 sha2
= extract(tree2
, size2
, &path2
, &mode2
);
119 pathlen1
= strlen(path1
);
120 pathlen2
= strlen(path2
);
121 cmp
= cache_name_compare(path1
, pathlen1
, path2
, pathlen2
);
123 show_file("-", tree1
, size1
, base
);
127 show_file("+", tree2
, size2
, base
);
130 if (!memcmp(sha1
, sha2
, 20) && mode1
== mode2
)
134 * If the filemode has changed to/from a directory from/to a regular
135 * file, we need to consider it a remove and an add.
137 if (S_ISDIR(mode1
) != S_ISDIR(mode2
)) {
138 show_file("-", tree1
, size1
, base
);
139 show_file("+", tree2
, size2
, base
);
143 if (recursive
&& S_ISDIR(mode1
)) {
145 char *newbase
= malloc_base(base
, path1
, pathlen1
);
146 retval
= diff_tree_sha1(sha1
, sha2
, newbase
);
152 printf("%s", header
);
158 if (generate_patch
) {
160 diff_change(mode1
, mode2
, sha1
, sha2
, base
, path1
);
163 strcpy(old_sha1_hex
, sha1_to_hex(sha1
));
164 printf("*%06o->%06o\t%s\t%s->%s\t%s%s%c", mode1
, mode2
,
165 S_ISDIR(mode1
) ? "tree" : "blob",
166 old_sha1_hex
, sha1_to_hex(sha2
), base
, path1
,
172 static int interesting(void *tree
, unsigned long size
, const char *base
)
177 int baselen
, pathlen
;
182 (void)extract(tree
, size
, &path
, &mode
);
184 pathlen
= strlen(path
);
185 baselen
= strlen(base
);
187 for (i
=0; i
< nr_paths
; i
++) {
188 const char *match
= paths
[i
];
189 int matchlen
= pathlens
[i
];
191 if (baselen
>= matchlen
) {
192 /* If it doesn't match, move along... */
193 if (strncmp(base
, match
, matchlen
))
196 /* The base is a subdirectory of a path which was specified. */
200 /* Does the base match? */
201 if (strncmp(base
, match
, baselen
))
207 if (pathlen
> matchlen
)
210 if (strncmp(path
, match
, pathlen
))
215 return 0; /* No matches */
218 static int diff_tree(void *tree1
, unsigned long size1
, void *tree2
, unsigned long size2
, const char *base
)
220 while (size1
| size2
) {
221 if (nr_paths
&& size1
&& !interesting(tree1
, size1
, base
)) {
222 update_tree_entry(&tree1
, &size1
);
225 if (nr_paths
&& size2
&& !interesting(tree2
, size2
, base
)) {
226 update_tree_entry(&tree2
, &size2
);
230 show_file("+", tree2
, size2
, base
);
231 update_tree_entry(&tree2
, &size2
);
235 show_file("-", tree1
, size1
, base
);
236 update_tree_entry(&tree1
, &size1
);
239 switch (compare_tree_entry(tree1
, size1
, tree2
, size2
, base
)) {
241 update_tree_entry(&tree1
, &size1
);
244 update_tree_entry(&tree1
, &size1
);
247 update_tree_entry(&tree2
, &size2
);
250 die("diff-tree: internal error");
255 static int diff_tree_sha1(const unsigned char *old
, const unsigned char *new, const char *base
)
258 unsigned long size1
, size2
;
261 tree1
= read_object_with_reference(old
, "tree", &size1
, 0);
263 die("unable to read source tree (%s)", sha1_to_hex(old
));
264 tree2
= read_object_with_reference(new, "tree", &size2
, 0);
266 die("unable to read destination tree (%s)", sha1_to_hex(new));
267 retval
= diff_tree(tree1
, size1
, tree2
, size2
, base
);
273 static int diff_tree_stdin(char *line
)
275 int len
= strlen(line
);
276 unsigned char commit
[20], parent
[20];
277 unsigned long size
, offset
;
278 static char this_header
[100];
281 if (!len
|| line
[len
-1] != '\n')
284 if (get_sha1_hex(line
, commit
))
286 if (isspace(line
[40]) && !get_sha1_hex(line
+41, parent
)) {
289 sprintf(this_header
, "%s (from %s)\n", line
, line
+41);
290 header
= this_header
;
291 return diff_tree_sha1(parent
, commit
, "");
293 buf
= read_object_with_reference(commit
, "commit", &size
, NULL
);
297 /* More than one parent? */
299 if (!memcmp(buf
+ 46 + 48, "parent ", 7))
305 while (offset
+ 48 < size
&& !memcmp(buf
+ offset
, "parent ", 7)) {
306 if (get_sha1_hex(buf
+ offset
+ 7, parent
))
308 sprintf(this_header
, "%s (from %s)\n", line
, sha1_to_hex(parent
));
309 header
= this_header
;
310 diff_tree_sha1(parent
, commit
, "");
316 static char *diff_tree_usage
= "diff-tree [-p] [-r] [-z] <tree sha1> <tree sha1>";
318 int main(int argc
, char **argv
)
321 unsigned char old
[20], new[20];
329 if (!arg
|| *arg
!= '-')
332 if (!strcmp(arg
, "-")) {
337 if (!strcmp(arg
, "-r")) {
341 if (!strcmp(arg
, "-p")) {
342 recursive
= generate_patch
= 1;
345 if (!strcmp(arg
, "-z")) {
346 line_termination
= '\0';
349 if (!strcmp(arg
, "-m")) {
353 if (!strcmp(arg
, "-s")) {
357 if (!strcmp(arg
, "--stdin")) {
361 usage(diff_tree_usage
);
365 if (argc
< 2 || get_sha1(argv
[0], old
) || get_sha1(argv
[1], new))
366 usage(diff_tree_usage
);
376 pathlens
= xmalloc(nr_paths
* sizeof(int));
377 for (i
=0; i
<nr_paths
; i
++)
378 pathlens
[i
] = strlen(paths
[i
]);
382 return diff_tree_sha1(old
, new, "");
384 while (fgets(line
, sizeof(line
), stdin
))
385 diff_tree_stdin(line
);