Revision 4056afbcf2d3ee3e9df2788656f3197cc363a2ee authored by Junio C Hamano on 23 February 2012, 05:55:06 UTC, committed by Junio C Hamano on 23 February 2012, 05:55:06 UTC
When falling back to 3-way merge, we run "git apply" to synthesize the fake ancestor tree by parsing the incoming patch, and another "git apply" to apply the patch to the fake ancestor tree. Both invocation need to be aware of the custom -p<num> setting to parse patches that were prepared with non-standard src/dst prefix. Signed-off-by: Junio C Hamano <gitster@pobox.com>
1 parent d0482e8
merge-file.c
#include "cache.h"
#include "run-command.h"
#include "xdiff-interface.h"
#include "ll-merge.h"
#include "blob.h"
#include "merge-file.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.sha1, &type, &size);
if (!buf)
return -1;
if (type != OBJ_BLOB)
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;
}
static int common_outf(void *priv_, mmbuffer_t *mb, int nbuf)
{
int i;
mmfile_t *dst = priv_;
for (i = 0; i < nbuf; i++) {
memcpy(dst->ptr + dst->size, mb[i].ptr, mb[i].size);
dst->size += mb[i].size;
}
return 0;
}
static int generate_common_file(mmfile_t *res, mmfile_t *f1, mmfile_t *f2)
{
unsigned long size = f1->size < f2->size ? f1->size : f2->size;
void *ptr = xmalloc(size);
xpparam_t xpp;
xdemitconf_t xecfg;
xdemitcb_t ecb;
memset(&xpp, 0, sizeof(xpp));
xpp.flags = 0;
memset(&xecfg, 0, sizeof(xecfg));
xecfg.ctxlen = 3;
xecfg.flags = XDL_EMIT_COMMON;
ecb.outf = common_outf;
res->ptr = ptr;
res->size = 0;
ecb.priv = res;
return xdi_diff(f1, f2, &xpp, &xecfg, &ecb);
}
void *merge_file(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.sha1, &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 {
if (generate_common_file(&common, &f1, &f2) < 0)
goto out_free_f2_f1;
}
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;
}
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