1 #include "cache.h"
2 #include "run-command.h"
3 #include "xdiff-interface.h"
4 #include "ll-merge.h"
5 #include "blob.h"
6 #include "merge-blobs.h"
7 #include "object-store.h"
8
fill_mmfile_blob(mmfile_t * f,struct blob * obj)9 static int fill_mmfile_blob(mmfile_t *f, struct blob *obj)
10 {
11 void *buf;
12 unsigned long size;
13 enum object_type type;
14
15 buf = read_object_file(&obj->object.oid, &type, &size);
16 if (!buf)
17 return -1;
18 if (type != OBJ_BLOB) {
19 free(buf);
20 return -1;
21 }
22 f->ptr = buf;
23 f->size = size;
24 return 0;
25 }
26
free_mmfile(mmfile_t * f)27 static void free_mmfile(mmfile_t *f)
28 {
29 free(f->ptr);
30 }
31
three_way_filemerge(struct index_state * istate,const char * path,mmfile_t * base,mmfile_t * our,mmfile_t * their,unsigned long * size)32 static void *three_way_filemerge(struct index_state *istate,
33 const char *path,
34 mmfile_t *base,
35 mmfile_t *our,
36 mmfile_t *their,
37 unsigned long *size)
38 {
39 int merge_status;
40 mmbuffer_t res;
41
42 /*
43 * This function is only used by cmd_merge_tree, which
44 * does not respect the merge.conflictstyle option.
45 * There is no need to worry about a label for the
46 * common ancestor.
47 */
48 merge_status = ll_merge(&res, path, base, NULL,
49 our, ".our", their, ".their",
50 istate, NULL);
51 if (merge_status < 0)
52 return NULL;
53
54 *size = res.size;
55 return res.ptr;
56 }
57
merge_blobs(struct index_state * istate,const char * path,struct blob * base,struct blob * our,struct blob * their,unsigned long * size)58 void *merge_blobs(struct index_state *istate, const char *path,
59 struct blob *base, struct blob *our,
60 struct blob *their, unsigned long *size)
61 {
62 void *res = NULL;
63 mmfile_t f1, f2, common;
64
65 /*
66 * Removed in either branch?
67 *
68 * NOTE! This depends on the caller having done the
69 * proper warning about removing a file that got
70 * modified in the other branch!
71 */
72 if (!our || !their) {
73 enum object_type type;
74 if (base)
75 return NULL;
76 if (!our)
77 our = their;
78 return read_object_file(&our->object.oid, &type, size);
79 }
80
81 if (fill_mmfile_blob(&f1, our) < 0)
82 goto out_no_mmfile;
83 if (fill_mmfile_blob(&f2, their) < 0)
84 goto out_free_f1;
85
86 if (base) {
87 if (fill_mmfile_blob(&common, base) < 0)
88 goto out_free_f2_f1;
89 } else {
90 common.ptr = xstrdup("");
91 common.size = 0;
92 }
93 res = three_way_filemerge(istate, path, &common, &f1, &f2, size);
94 free_mmfile(&common);
95 out_free_f2_f1:
96 free_mmfile(&f2);
97 out_free_f1:
98 free_mmfile(&f1);
99 out_no_mmfile:
100 return res;
101 }
102