18b26b18c5
"git merge-tree" used to mishandle "both sides added" conflict with its own "create a fake ancestor file that has the common parts of what both sides have added and do a 3-way merge" logic; this has been updated to use the usual "3-way merge with an empty blob as the fake common ancestor file" approach used in the rest of the system. * jk/no-diff-emit-common: xdiff: drop XDL_EMIT_COMMON merge-tree: drop generate_common strategy merge-one-file: use empty blob for add/add base
93 lines
1.9 KiB
C
93 lines
1.9 KiB
C
#include "cache.h"
|
|
#include "run-command.h"
|
|
#include "xdiff-interface.h"
|
|
#include "ll-merge.h"
|
|
#include "blob.h"
|
|
#include "merge-blobs.h"
|
|
|
|
static int fill_mmfile_blob(mmfile_t *f, struct blob *obj)
|
|
{
|
|
void *buf;
|
|
unsigned long size;
|
|
enum object_type type;
|
|
|
|
buf = read_sha1_file(obj->object.oid.hash, &type, &size);
|
|
if (!buf)
|
|
return -1;
|
|
if (type != OBJ_BLOB) {
|
|
free(buf);
|
|
return -1;
|
|
}
|
|
f->ptr = buf;
|
|
f->size = size;
|
|
return 0;
|
|
}
|
|
|
|
static void free_mmfile(mmfile_t *f)
|
|
{
|
|
free(f->ptr);
|
|
}
|
|
|
|
static void *three_way_filemerge(const char *path, mmfile_t *base, mmfile_t *our, mmfile_t *their, unsigned long *size)
|
|
{
|
|
int merge_status;
|
|
mmbuffer_t res;
|
|
|
|
/*
|
|
* This function is only used by cmd_merge_tree, which
|
|
* does not respect the merge.conflictstyle option.
|
|
* There is no need to worry about a label for the
|
|
* common ancestor.
|
|
*/
|
|
merge_status = ll_merge(&res, path, base, NULL,
|
|
our, ".our", their, ".their", NULL);
|
|
if (merge_status < 0)
|
|
return NULL;
|
|
|
|
*size = res.size;
|
|
return res.ptr;
|
|
}
|
|
|
|
void *merge_blobs(const char *path, struct blob *base, struct blob *our, struct blob *their, unsigned long *size)
|
|
{
|
|
void *res = NULL;
|
|
mmfile_t f1, f2, common;
|
|
|
|
/*
|
|
* Removed in either branch?
|
|
*
|
|
* NOTE! This depends on the caller having done the
|
|
* proper warning about removing a file that got
|
|
* modified in the other branch!
|
|
*/
|
|
if (!our || !their) {
|
|
enum object_type type;
|
|
if (base)
|
|
return NULL;
|
|
if (!our)
|
|
our = their;
|
|
return read_sha1_file(our->object.oid.hash, &type, size);
|
|
}
|
|
|
|
if (fill_mmfile_blob(&f1, our) < 0)
|
|
goto out_no_mmfile;
|
|
if (fill_mmfile_blob(&f2, their) < 0)
|
|
goto out_free_f1;
|
|
|
|
if (base) {
|
|
if (fill_mmfile_blob(&common, base) < 0)
|
|
goto out_free_f2_f1;
|
|
} else {
|
|
common.ptr = xstrdup("");
|
|
common.size = 0;
|
|
}
|
|
res = three_way_filemerge(path, &common, &f1, &f2, size);
|
|
free_mmfile(&common);
|
|
out_free_f2_f1:
|
|
free_mmfile(&f2);
|
|
out_free_f1:
|
|
free_mmfile(&f1);
|
|
out_no_mmfile:
|
|
return res;
|
|
}
|