static int merge(const char *name, const char *path)
{
int ret;
mmfile_t cur, base, other;
mmbuffer_t result = {NULL, 0};
xpparam_t xpp = {XDF_NEED_MINIMAL};
if (handle_file(path, NULL, rr_path(name, "thisimage")) < 0)
return 1;
if (read_mmfile(&cur, rr_path(name, "thisimage")) ||
read_mmfile(&base, rr_path(name, "preimage")) ||
read_mmfile(&other, rr_path(name, "postimage")))
return 1;
ret = xdl_merge(&base, &cur, "", &other, "",
&xpp, XDL_MERGE_ZEALOUS, &result);
if (!ret) {
FILE *f = fopen(path, "w");
if (!f)
return error("Could not open %s: %s", path,
strerror(errno));
if (fwrite(result.ptr, result.size, 1, f) != 1)
error("Could not write %s: %s", path, strerror(errno));
if (fclose(f))
return error("Writing %s failed: %s", path,
strerror(errno));
}
free(cur.ptr);
free(base.ptr);
free(other.ptr);
free(result.ptr);
return ret;
}
static int diff_two(const char *file1, const char *label1,
const char *file2, const char *label2)
{
xpparam_t xpp;
xdemitconf_t xecfg;
xdemitcb_t ecb;
mmfile_t minus, plus;
int ret;
if (read_mmfile(&minus, file1) || read_mmfile(&plus, file2))
return -1;
printf("--- a/%s\n+++ b/%s\n", label1, label2);
fflush(stdout);
memset(&xpp, 0, sizeof(xpp));
xpp.flags = 0;
memset(&xecfg, 0, sizeof(xecfg));
xecfg.ctxlen = 3;
ecb.outf = outf;
ret = xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
free(minus.ptr);
free(plus.ptr);
return ret;
}
/*
* Find the conflict identified by "id"; the change between its
* "preimage" (i.e. a previous contents with conflict markers) and its
* "postimage" (i.e. the corresponding contents with conflicts
* resolved) may apply cleanly to the contents stored in "path", i.e.
* the conflict this time around.
*
* Returns 0 for successful replay of recorded resolution, or non-zero
* for failure.
*/
static int merge(const struct rerere_id *id, const char *path)
{
FILE *f;
int ret;
mmfile_t cur = {NULL, 0}, base = {NULL, 0}, other = {NULL, 0};
mmbuffer_t result = {NULL, 0};
/*
* Normalize the conflicts in path and write it out to
* "thisimage" temporary file.
*/
if (handle_file(path, NULL, rerere_path(id, "thisimage")) < 0) {
ret = 1;
goto out;
}
if (read_mmfile(&cur, rerere_path(id, "thisimage")) ||
read_mmfile(&base, rerere_path(id, "preimage")) ||
read_mmfile(&other, rerere_path(id, "postimage"))) {
ret = 1;
goto out;
}
/*
* A three-way merge. Note that this honors user-customizable
* low-level merge driver settings.
*/
ret = ll_merge(&result, path, &base, NULL, &cur, "", &other, "", NULL);
if (ret)
goto out;
/*
* A successful replay of recorded resolution.
* Mark that "postimage" was used to help gc.
*/
if (utime(rerere_path(id, "postimage"), NULL) < 0)
warning("failed utime() on %s: %s",
rerere_path(id, "postimage"),
strerror(errno));
/* Update "path" with the resolution */
f = fopen(path, "w");
if (!f)
return error("Could not open %s: %s", path,
strerror(errno));
if (fwrite(result.ptr, result.size, 1, f) != 1)
error("Could not write %s: %s", path, strerror(errno));
if (fclose(f))
return error("Writing %s failed: %s", path,
strerror(errno));
out:
free(cur.ptr);
free(base.ptr);
free(other.ptr);
free(result.ptr);
return ret;
}
static int merge(const char *name, const char *path)
{
int ret;
mmfile_t cur = {NULL, 0}, base = {NULL, 0}, other = {NULL, 0};
mmbuffer_t result = {NULL, 0};
if (handle_file(path, NULL, rerere_path(name, "thisimage")) < 0)
return 1;
if (read_mmfile(&cur, rerere_path(name, "thisimage")) ||
read_mmfile(&base, rerere_path(name, "preimage")) ||
read_mmfile(&other, rerere_path(name, "postimage"))) {
ret = 1;
goto out;
}
ret = ll_merge(&result, path, &base, NULL, &cur, "", &other, "", NULL);
if (!ret) {
FILE *f;
if (utime(rerere_path(name, "postimage"), NULL) < 0)
warning("failed utime() on %s: %s",
rerere_path(name, "postimage"),
strerror(errno));
f = fopen(path, "w");
if (!f)
return error("Could not open %s: %s", path,
strerror(errno));
if (fwrite(result.ptr, result.size, 1, f) != 1)
error("Could not write %s: %s", path, strerror(errno));
if (fclose(f))
return error("Writing %s failed: %s", path,
strerror(errno));
}
out:
free(cur.ptr);
free(base.ptr);
free(other.ptr);
free(result.ptr);
return ret;
}
/*
* Try using the given conflict resolution "ID" to see
* if that recorded conflict resolves cleanly what we
* got in the "cur".
*/
static int try_merge(const struct rerere_id *id, const char *path,
mmfile_t *cur, mmbuffer_t *result)
{
int ret;
mmfile_t base = {NULL, 0}, other = {NULL, 0};
if (read_mmfile(&base, rerere_path(id, "preimage")) ||
read_mmfile(&other, rerere_path(id, "postimage")))
ret = 1;
else
/*
* A three-way merge. Note that this honors user-customizable
* low-level merge driver settings.
*/
ret = ll_merge(result, path, &base, NULL, cur, "", &other, "", NULL);
free(base.ptr);
free(other.ptr);
return ret;
}
/*
* Find the conflict identified by "id"; the change between its
* "preimage" (i.e. a previous contents with conflict markers) and its
* "postimage" (i.e. the corresponding contents with conflicts
* resolved) may apply cleanly to the contents stored in "path", i.e.
* the conflict this time around.
*
* Returns 0 for successful replay of recorded resolution, or non-zero
* for failure.
*/
static int merge(const struct rerere_id *id, const char *path)
{
FILE *f;
int ret;
mmfile_t cur = {NULL, 0};
mmbuffer_t result = {NULL, 0};
/*
* Normalize the conflicts in path and write it out to
* "thisimage" temporary file.
*/
if ((handle_file(path, NULL, rerere_path(id, "thisimage")) < 0) ||
read_mmfile(&cur, rerere_path(id, "thisimage"))) {
ret = 1;
goto out;
}
ret = try_merge(id, path, &cur, &result);
if (ret)
goto out;
/*
* A successful replay of recorded resolution.
* Mark that "postimage" was used to help gc.
*/
if (utime(rerere_path(id, "postimage"), NULL) < 0)
warning_errno(_("failed utime() on '%s'"),
rerere_path(id, "postimage"));
/* Update "path" with the resolution */
f = fopen(path, "w");
if (!f)
return error_errno(_("could not open '%s'"), path);
if (fwrite(result.ptr, result.size, 1, f) != 1)
error_errno(_("could not write '%s'"), path);
if (fclose(f))
return error_errno(_("writing '%s' failed"), path);
out:
free(cur.ptr);
free(result.ptr);
return ret;
}
static int rerere_forget_one_path(const char *path, struct string_list *rr)
{
const char *filename;
struct rerere_id *id;
unsigned char sha1[20];
int ret;
struct string_list_item *item;
/*
* Recreate the original conflict from the stages in the
* index and compute the conflict ID
*/
ret = handle_cache(path, sha1, NULL);
if (ret < 1)
return error(_("could not parse conflict hunks in '%s'"), path);
/* Nuke the recorded resolution for the conflict */
id = new_rerere_id(sha1);
for (id->variant = 0;
id->variant < id->collection->status_nr;
id->variant++) {
mmfile_t cur = { NULL, 0 };
mmbuffer_t result = {NULL, 0};
int cleanly_resolved;
if (!has_rerere_resolution(id))
continue;
handle_cache(path, sha1, rerere_path(id, "thisimage"));
if (read_mmfile(&cur, rerere_path(id, "thisimage"))) {
free(cur.ptr);
error(_("failed to update conflicted state in '%s'"), path);
goto fail_exit;
}
cleanly_resolved = !try_merge(id, path, &cur, &result);
free(result.ptr);
free(cur.ptr);
if (cleanly_resolved)
break;
}
if (id->collection->status_nr <= id->variant) {
error(_("no remembered resolution for '%s'"), path);
goto fail_exit;
}
filename = rerere_path(id, "postimage");
if (unlink(filename)) {
if (errno == ENOENT)
error(_("no remembered resolution for '%s'"), path);
else
error_errno(_("cannot unlink '%s'"), filename);
goto fail_exit;
}
/*
* Update the preimage so that the user can resolve the
* conflict in the working tree, run us again to record
* the postimage.
*/
handle_cache(path, sha1, rerere_path(id, "preimage"));
fprintf_ln(stderr, _("Updated preimage for '%s'"), path);
/*
* And remember that we can record resolution for this
* conflict when the user is done.
*/
item = string_list_insert(rr, path);
free_rerere_id(item);
item->util = id;
fprintf(stderr, _("Forgot resolution for '%s'\n"), path);
return 0;
fail_exit:
free(id);
return -1;
}
int cmd_merge_file(int argc, const char **argv, const char *prefix)
{
const char *names[3] = { NULL, NULL, NULL };
mmfile_t mmfs[3];
mmbuffer_t result = {NULL, 0};
xmparam_t xmp = {{0}};
int ret = 0, i = 0, to_stdout = 0;
int quiet = 0;
int prefixlen = 0;
struct option options[] = {
OPT_BOOLEAN('p', "stdout", &to_stdout, "send results to standard output"),
OPT_SET_INT(0, "diff3", &xmp.style, "use a diff3 based merge", XDL_MERGE_DIFF3),
OPT_SET_INT(0, "ours", &xmp.favor, "for conflicts, use our version",
XDL_MERGE_FAVOR_OURS),
OPT_SET_INT(0, "theirs", &xmp.favor, "for conflicts, use their version",
XDL_MERGE_FAVOR_THEIRS),
OPT_SET_INT(0, "union", &xmp.favor, "for conflicts, use a union version",
XDL_MERGE_FAVOR_UNION),
OPT_INTEGER(0, "marker-size", &xmp.marker_size,
"for conflicts, use this marker size"),
OPT__QUIET(&quiet, "do not warn about conflicts"),
OPT_CALLBACK('L', NULL, names, "name",
"set labels for file1/orig_file/file2", &label_cb),
OPT_END(),
};
xmp.level = XDL_MERGE_ZEALOUS_ALNUM;
xmp.style = 0;
xmp.favor = 0;
if (startup_info->have_repository) {
/* Read the configuration file */
git_config(git_xmerge_config, NULL);
if (0 <= git_xmerge_style)
xmp.style = git_xmerge_style;
}
argc = parse_options(argc, argv, prefix, options, merge_file_usage, 0);
if (argc != 3)
usage_with_options(merge_file_usage, options);
if (quiet) {
if (!freopen("/dev/null", "w", stderr))
return error("failed to redirect stderr to /dev/null: "
"%s", strerror(errno));
}
if (prefix)
prefixlen = strlen(prefix);
for (i = 0; i < 3; i++) {
const char *fname = prefix_filename(prefix, prefixlen, argv[i]);
if (!names[i])
names[i] = argv[i];
if (read_mmfile(mmfs + i, fname))
return -1;
if (buffer_is_binary(mmfs[i].ptr, mmfs[i].size))
return error("Cannot merge binary files: %s",
argv[i]);
}
xmp.ancestor = names[1];
xmp.file1 = names[0];
xmp.file2 = names[2];
ret = xdl_merge(mmfs + 1, mmfs + 0, mmfs + 2, &xmp, &result);
for (i = 0; i < 3; i++)
free(mmfs[i].ptr);
if (ret >= 0) {
const char *filename = argv[0];
FILE *f = to_stdout ? stdout : fopen(filename, "wb");
if (!f)
ret = error("Could not open %s for writing", filename);
else if (result.size &&
fwrite(result.ptr, result.size, 1, f) != 1)
ret = error("Could not write to %s", filename);
else if (fclose(f))
ret = error("Could not close %s", filename);
free(result.ptr);
}
return ret;
}
int cmd_merge_file(int argc, const char **argv, const char *prefix)
{
const char *names[3] = { NULL, NULL, NULL };
mmfile_t mmfs[3];
mmbuffer_t result = {NULL, 0};
xmparam_t xmp = {{XDF_NEED_MINIMAL}};
int ret = 0, i = 0, to_stdout = 0;
int level = XDL_MERGE_ZEALOUS_ALNUM;
int style = 0, quiet = 0;
int favor = 0;
int nongit;
struct option options[] = {
OPT_BOOLEAN('p', "stdout", &to_stdout, "send results to standard output"),
OPT_SET_INT(0, "diff3", &style, "use a diff3 based merge", XDL_MERGE_DIFF3),
OPT_SET_INT(0, "ours", &favor, "for conflicts, use our version",
XDL_MERGE_FAVOR_OURS),
OPT_SET_INT(0, "theirs", &favor, "for conflicts, use their version",
XDL_MERGE_FAVOR_THEIRS),
OPT__QUIET(&quiet),
OPT_CALLBACK('L', NULL, names, "name",
"set labels for file1/orig_file/file2", &label_cb),
OPT_END(),
};
prefix = setup_git_directory_gently(&nongit);
if (!nongit) {
/* Read the configuration file */
git_config(git_xmerge_config, NULL);
if (0 <= git_xmerge_style)
style = git_xmerge_style;
}
argc = parse_options(argc, argv, prefix, options, merge_file_usage, 0);
if (argc != 3)
usage_with_options(merge_file_usage, options);
if (quiet) {
if (!freopen("/dev/null", "w", stderr))
return error("failed to redirect stderr to /dev/null: "
"%s\n", strerror(errno));
}
for (i = 0; i < 3; i++) {
if (!names[i])
names[i] = argv[i];
if (read_mmfile(mmfs + i, argv[i]))
return -1;
if (buffer_is_binary(mmfs[i].ptr, mmfs[i].size))
return error("Cannot merge binary files: %s\n",
argv[i]);
}
ret = xdl_merge(mmfs + 1, mmfs + 0, names[0], mmfs + 2, names[2],
&xmp, XDL_MERGE_FLAGS(level, style, favor), &result);
for (i = 0; i < 3; i++)
free(mmfs[i].ptr);
if (ret >= 0) {
const char *filename = argv[0];
FILE *f = to_stdout ? stdout : fopen(filename, "wb");
if (!f)
ret = error("Could not open %s for writing", filename);
else if (result.size &&
fwrite(result.ptr, result.size, 1, f) != 1)
ret = error("Could not write to %s", filename);
else if (fclose(f))
ret = error("Could not close %s", filename);
free(result.ptr);
}
return ret;
}
