git/merge-recursive.c
Junio C Hamano 74aabf41ce Merge branch 'mm/merge-rename-delete-message'
When "git merge" detects a path that is renamed in one history
while the other history deleted (or modified) it, it now reports
both paths to help the user understand what is going on in the two
histories being merged.

* mm/merge-rename-delete-message:
  merge-recursive: make "CONFLICT (rename/delete)" message show both paths
2017-02-27 13:57:12 -08:00

2237 lines
61 KiB
C

/*
* Recursive Merge algorithm stolen from git-merge-recursive.py by
* Fredrik Kuivinen.
* The thieves were Alex Riesen and Johannes Schindelin, in June/July 2006
*/
#include "cache.h"
#include "advice.h"
#include "lockfile.h"
#include "cache-tree.h"
#include "commit.h"
#include "blob.h"
#include "builtin.h"
#include "tree-walk.h"
#include "diff.h"
#include "diffcore.h"
#include "tag.h"
#include "unpack-trees.h"
#include "string-list.h"
#include "xdiff-interface.h"
#include "ll-merge.h"
#include "attr.h"
#include "merge-recursive.h"
#include "dir.h"
#include "submodule.h"
static void flush_output(struct merge_options *o)
{
if (o->buffer_output < 2 && o->obuf.len) {
fputs(o->obuf.buf, stdout);
strbuf_reset(&o->obuf);
}
}
static int err(struct merge_options *o, const char *err, ...)
{
va_list params;
if (o->buffer_output < 2)
flush_output(o);
else {
strbuf_complete(&o->obuf, '\n');
strbuf_addstr(&o->obuf, "error: ");
}
va_start(params, err);
strbuf_vaddf(&o->obuf, err, params);
va_end(params);
if (o->buffer_output > 1)
strbuf_addch(&o->obuf, '\n');
else {
error("%s", o->obuf.buf);
strbuf_reset(&o->obuf);
}
return -1;
}
static struct tree *shift_tree_object(struct tree *one, struct tree *two,
const char *subtree_shift)
{
struct object_id shifted;
if (!*subtree_shift) {
shift_tree(&one->object.oid, &two->object.oid, &shifted, 0);
} else {
shift_tree_by(&one->object.oid, &two->object.oid, &shifted,
subtree_shift);
}
if (!oidcmp(&two->object.oid, &shifted))
return two;
return lookup_tree(shifted.hash);
}
static struct commit *make_virtual_commit(struct tree *tree, const char *comment)
{
struct commit *commit = alloc_commit_node();
set_merge_remote_desc(commit, comment, (struct object *)commit);
commit->tree = tree;
commit->object.parsed = 1;
return commit;
}
/*
* Since we use get_tree_entry(), which does not put the read object into
* the object pool, we cannot rely on a == b.
*/
static int oid_eq(const struct object_id *a, const struct object_id *b)
{
if (!a && !b)
return 2;
return a && b && oidcmp(a, b) == 0;
}
enum rename_type {
RENAME_NORMAL = 0,
RENAME_DELETE,
RENAME_ONE_FILE_TO_ONE,
RENAME_ONE_FILE_TO_TWO,
RENAME_TWO_FILES_TO_ONE
};
struct rename_conflict_info {
enum rename_type rename_type;
struct diff_filepair *pair1;
struct diff_filepair *pair2;
const char *branch1;
const char *branch2;
struct stage_data *dst_entry1;
struct stage_data *dst_entry2;
struct diff_filespec ren1_other;
struct diff_filespec ren2_other;
};
/*
* Since we want to write the index eventually, we cannot reuse the index
* for these (temporary) data.
*/
struct stage_data {
struct {
unsigned mode;
struct object_id oid;
} stages[4];
struct rename_conflict_info *rename_conflict_info;
unsigned processed:1;
};
static inline void setup_rename_conflict_info(enum rename_type rename_type,
struct diff_filepair *pair1,
struct diff_filepair *pair2,
const char *branch1,
const char *branch2,
struct stage_data *dst_entry1,
struct stage_data *dst_entry2,
struct merge_options *o,
struct stage_data *src_entry1,
struct stage_data *src_entry2)
{
struct rename_conflict_info *ci = xcalloc(1, sizeof(struct rename_conflict_info));
ci->rename_type = rename_type;
ci->pair1 = pair1;
ci->branch1 = branch1;
ci->branch2 = branch2;
ci->dst_entry1 = dst_entry1;
dst_entry1->rename_conflict_info = ci;
dst_entry1->processed = 0;
assert(!pair2 == !dst_entry2);
if (dst_entry2) {
ci->dst_entry2 = dst_entry2;
ci->pair2 = pair2;
dst_entry2->rename_conflict_info = ci;
}
if (rename_type == RENAME_TWO_FILES_TO_ONE) {
/*
* For each rename, there could have been
* modifications on the side of history where that
* file was not renamed.
*/
int ostage1 = o->branch1 == branch1 ? 3 : 2;
int ostage2 = ostage1 ^ 1;
ci->ren1_other.path = pair1->one->path;
oidcpy(&ci->ren1_other.oid, &src_entry1->stages[ostage1].oid);
ci->ren1_other.mode = src_entry1->stages[ostage1].mode;
ci->ren2_other.path = pair2->one->path;
oidcpy(&ci->ren2_other.oid, &src_entry2->stages[ostage2].oid);
ci->ren2_other.mode = src_entry2->stages[ostage2].mode;
}
}
static int show(struct merge_options *o, int v)
{
return (!o->call_depth && o->verbosity >= v) || o->verbosity >= 5;
}
__attribute__((format (printf, 3, 4)))
static void output(struct merge_options *o, int v, const char *fmt, ...)
{
va_list ap;
if (!show(o, v))
return;
strbuf_addchars(&o->obuf, ' ', o->call_depth * 2);
va_start(ap, fmt);
strbuf_vaddf(&o->obuf, fmt, ap);
va_end(ap);
strbuf_addch(&o->obuf, '\n');
if (!o->buffer_output)
flush_output(o);
}
static void output_commit_title(struct merge_options *o, struct commit *commit)
{
strbuf_addchars(&o->obuf, ' ', o->call_depth * 2);
if (commit->util)
strbuf_addf(&o->obuf, "virtual %s\n",
merge_remote_util(commit)->name);
else {
strbuf_add_unique_abbrev(&o->obuf, commit->object.oid.hash,
DEFAULT_ABBREV);
strbuf_addch(&o->obuf, ' ');
if (parse_commit(commit) != 0)
strbuf_addstr(&o->obuf, _("(bad commit)\n"));
else {
const char *title;
const char *msg = get_commit_buffer(commit, NULL);
int len = find_commit_subject(msg, &title);
if (len)
strbuf_addf(&o->obuf, "%.*s\n", len, title);
unuse_commit_buffer(commit, msg);
}
}
flush_output(o);
}
static int add_cacheinfo(struct merge_options *o,
unsigned int mode, const struct object_id *oid,
const char *path, int stage, int refresh, int options)
{
struct cache_entry *ce;
int ret;
ce = make_cache_entry(mode, oid ? oid->hash : null_sha1, path, stage, 0);
if (!ce)
return err(o, _("addinfo_cache failed for path '%s'"), path);
ret = add_cache_entry(ce, options);
if (refresh) {
struct cache_entry *nce;
nce = refresh_cache_entry(ce, CE_MATCH_REFRESH | CE_MATCH_IGNORE_MISSING);
if (!nce)
return err(o, _("addinfo_cache failed for path '%s'"), path);
if (nce != ce)
ret = add_cache_entry(nce, options);
}
return ret;
}
static void init_tree_desc_from_tree(struct tree_desc *desc, struct tree *tree)
{
parse_tree(tree);
init_tree_desc(desc, tree->buffer, tree->size);
}
static int git_merge_trees(int index_only,
struct tree *common,
struct tree *head,
struct tree *merge)
{
int rc;
struct tree_desc t[3];
struct unpack_trees_options opts;
memset(&opts, 0, sizeof(opts));
if (index_only)
opts.index_only = 1;
else
opts.update = 1;
opts.merge = 1;
opts.head_idx = 2;
opts.fn = threeway_merge;
opts.src_index = &the_index;
opts.dst_index = &the_index;
setup_unpack_trees_porcelain(&opts, "merge");
init_tree_desc_from_tree(t+0, common);
init_tree_desc_from_tree(t+1, head);
init_tree_desc_from_tree(t+2, merge);
rc = unpack_trees(3, t, &opts);
cache_tree_free(&active_cache_tree);
return rc;
}
struct tree *write_tree_from_memory(struct merge_options *o)
{
struct tree *result = NULL;
if (unmerged_cache()) {
int i;
fprintf(stderr, "BUG: There are unmerged index entries:\n");
for (i = 0; i < active_nr; i++) {
const struct cache_entry *ce = active_cache[i];
if (ce_stage(ce))
fprintf(stderr, "BUG: %d %.*s\n", ce_stage(ce),
(int)ce_namelen(ce), ce->name);
}
die("BUG: unmerged index entries in merge-recursive.c");
}
if (!active_cache_tree)
active_cache_tree = cache_tree();
if (!cache_tree_fully_valid(active_cache_tree) &&
cache_tree_update(&the_index, 0) < 0) {
err(o, _("error building trees"));
return NULL;
}
result = lookup_tree(active_cache_tree->sha1);
return result;
}
static int save_files_dirs(const unsigned char *sha1,
struct strbuf *base, const char *path,
unsigned int mode, int stage, void *context)
{
int baselen = base->len;
struct merge_options *o = context;
strbuf_addstr(base, path);
if (S_ISDIR(mode))
string_list_insert(&o->current_directory_set, base->buf);
else
string_list_insert(&o->current_file_set, base->buf);
strbuf_setlen(base, baselen);
return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
}
static int get_files_dirs(struct merge_options *o, struct tree *tree)
{
int n;
struct pathspec match_all;
memset(&match_all, 0, sizeof(match_all));
if (read_tree_recursive(tree, "", 0, 0, &match_all, save_files_dirs, o))
return 0;
n = o->current_file_set.nr + o->current_directory_set.nr;
return n;
}
/*
* Returns an index_entry instance which doesn't have to correspond to
* a real cache entry in Git's index.
*/
static struct stage_data *insert_stage_data(const char *path,
struct tree *o, struct tree *a, struct tree *b,
struct string_list *entries)
{
struct string_list_item *item;
struct stage_data *e = xcalloc(1, sizeof(struct stage_data));
get_tree_entry(o->object.oid.hash, path,
e->stages[1].oid.hash, &e->stages[1].mode);
get_tree_entry(a->object.oid.hash, path,
e->stages[2].oid.hash, &e->stages[2].mode);
get_tree_entry(b->object.oid.hash, path,
e->stages[3].oid.hash, &e->stages[3].mode);
item = string_list_insert(entries, path);
item->util = e;
return e;
}
/*
* Create a dictionary mapping file names to stage_data objects. The
* dictionary contains one entry for every path with a non-zero stage entry.
*/
static struct string_list *get_unmerged(void)
{
struct string_list *unmerged = xcalloc(1, sizeof(struct string_list));
int i;
unmerged->strdup_strings = 1;
for (i = 0; i < active_nr; i++) {
struct string_list_item *item;
struct stage_data *e;
const struct cache_entry *ce = active_cache[i];
if (!ce_stage(ce))
continue;
item = string_list_lookup(unmerged, ce->name);
if (!item) {
item = string_list_insert(unmerged, ce->name);
item->util = xcalloc(1, sizeof(struct stage_data));
}
e = item->util;
e->stages[ce_stage(ce)].mode = ce->ce_mode;
oidcpy(&e->stages[ce_stage(ce)].oid, &ce->oid);
}
return unmerged;
}
static int string_list_df_name_compare(const char *one, const char *two)
{
int onelen = strlen(one);
int twolen = strlen(two);
/*
* Here we only care that entries for D/F conflicts are
* adjacent, in particular with the file of the D/F conflict
* appearing before files below the corresponding directory.
* The order of the rest of the list is irrelevant for us.
*
* To achieve this, we sort with df_name_compare and provide
* the mode S_IFDIR so that D/F conflicts will sort correctly.
* We use the mode S_IFDIR for everything else for simplicity,
* since in other cases any changes in their order due to
* sorting cause no problems for us.
*/
int cmp = df_name_compare(one, onelen, S_IFDIR,
two, twolen, S_IFDIR);
/*
* Now that 'foo' and 'foo/bar' compare equal, we have to make sure
* that 'foo' comes before 'foo/bar'.
*/
if (cmp)
return cmp;
return onelen - twolen;
}
static void record_df_conflict_files(struct merge_options *o,
struct string_list *entries)
{
/* If there is a D/F conflict and the file for such a conflict
* currently exist in the working tree, we want to allow it to be
* removed to make room for the corresponding directory if needed.
* The files underneath the directories of such D/F conflicts will
* be processed before the corresponding file involved in the D/F
* conflict. If the D/F directory ends up being removed by the
* merge, then we won't have to touch the D/F file. If the D/F
* directory needs to be written to the working copy, then the D/F
* file will simply be removed (in make_room_for_path()) to make
* room for the necessary paths. Note that if both the directory
* and the file need to be present, then the D/F file will be
* reinstated with a new unique name at the time it is processed.
*/
struct string_list df_sorted_entries = STRING_LIST_INIT_NODUP;
const char *last_file = NULL;
int last_len = 0;
int i;
/*
* If we're merging merge-bases, we don't want to bother with
* any working directory changes.
*/
if (o->call_depth)
return;
/* Ensure D/F conflicts are adjacent in the entries list. */
for (i = 0; i < entries->nr; i++) {
struct string_list_item *next = &entries->items[i];
string_list_append(&df_sorted_entries, next->string)->util =
next->util;
}
df_sorted_entries.cmp = string_list_df_name_compare;
string_list_sort(&df_sorted_entries);
string_list_clear(&o->df_conflict_file_set, 1);
for (i = 0; i < df_sorted_entries.nr; i++) {
const char *path = df_sorted_entries.items[i].string;
int len = strlen(path);
struct stage_data *e = df_sorted_entries.items[i].util;
/*
* Check if last_file & path correspond to a D/F conflict;
* i.e. whether path is last_file+'/'+<something>.
* If so, record that it's okay to remove last_file to make
* room for path and friends if needed.
*/
if (last_file &&
len > last_len &&
memcmp(path, last_file, last_len) == 0 &&
path[last_len] == '/') {
string_list_insert(&o->df_conflict_file_set, last_file);
}
/*
* Determine whether path could exist as a file in the
* working directory as a possible D/F conflict. This
* will only occur when it exists in stage 2 as a
* file.
*/
if (S_ISREG(e->stages[2].mode) || S_ISLNK(e->stages[2].mode)) {
last_file = path;
last_len = len;
} else {
last_file = NULL;
}
}
string_list_clear(&df_sorted_entries, 0);
}
struct rename {
struct diff_filepair *pair;
struct stage_data *src_entry;
struct stage_data *dst_entry;
unsigned processed:1;
};
/*
* Get information of all renames which occurred between 'o_tree' and
* 'tree'. We need the three trees in the merge ('o_tree', 'a_tree' and
* 'b_tree') to be able to associate the correct cache entries with
* the rename information. 'tree' is always equal to either a_tree or b_tree.
*/
static struct string_list *get_renames(struct merge_options *o,
struct tree *tree,
struct tree *o_tree,
struct tree *a_tree,
struct tree *b_tree,
struct string_list *entries)
{
int i;
struct string_list *renames;
struct diff_options opts;
renames = xcalloc(1, sizeof(struct string_list));
if (!o->detect_rename)
return renames;
diff_setup(&opts);
DIFF_OPT_SET(&opts, RECURSIVE);
DIFF_OPT_CLR(&opts, RENAME_EMPTY);
opts.detect_rename = DIFF_DETECT_RENAME;
opts.rename_limit = o->merge_rename_limit >= 0 ? o->merge_rename_limit :
o->diff_rename_limit >= 0 ? o->diff_rename_limit :
1000;
opts.rename_score = o->rename_score;
opts.show_rename_progress = o->show_rename_progress;
opts.output_format = DIFF_FORMAT_NO_OUTPUT;
diff_setup_done(&opts);
diff_tree_sha1(o_tree->object.oid.hash, tree->object.oid.hash, "", &opts);
diffcore_std(&opts);
if (opts.needed_rename_limit > o->needed_rename_limit)
o->needed_rename_limit = opts.needed_rename_limit;
for (i = 0; i < diff_queued_diff.nr; ++i) {
struct string_list_item *item;
struct rename *re;
struct diff_filepair *pair = diff_queued_diff.queue[i];
if (pair->status != 'R') {
diff_free_filepair(pair);
continue;
}
re = xmalloc(sizeof(*re));
re->processed = 0;
re->pair = pair;
item = string_list_lookup(entries, re->pair->one->path);
if (!item)
re->src_entry = insert_stage_data(re->pair->one->path,
o_tree, a_tree, b_tree, entries);
else
re->src_entry = item->util;
item = string_list_lookup(entries, re->pair->two->path);
if (!item)
re->dst_entry = insert_stage_data(re->pair->two->path,
o_tree, a_tree, b_tree, entries);
else
re->dst_entry = item->util;
item = string_list_insert(renames, pair->one->path);
item->util = re;
}
opts.output_format = DIFF_FORMAT_NO_OUTPUT;
diff_queued_diff.nr = 0;
diff_flush(&opts);
return renames;
}
static int update_stages(struct merge_options *opt, const char *path,
const struct diff_filespec *o,
const struct diff_filespec *a,
const struct diff_filespec *b)
{
/*
* NOTE: It is usually a bad idea to call update_stages on a path
* before calling update_file on that same path, since it can
* sometimes lead to spurious "refusing to lose untracked file..."
* messages from update_file (via make_room_for path via
* would_lose_untracked). Instead, reverse the order of the calls
* (executing update_file first and then update_stages).
*/
int clear = 1;
int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_SKIP_DFCHECK;
if (clear)
if (remove_file_from_cache(path))
return -1;
if (o)
if (add_cacheinfo(opt, o->mode, &o->oid, path, 1, 0, options))
return -1;
if (a)
if (add_cacheinfo(opt, a->mode, &a->oid, path, 2, 0, options))
return -1;
if (b)
if (add_cacheinfo(opt, b->mode, &b->oid, path, 3, 0, options))
return -1;
return 0;
}
static void update_entry(struct stage_data *entry,
struct diff_filespec *o,
struct diff_filespec *a,
struct diff_filespec *b)
{
entry->processed = 0;
entry->stages[1].mode = o->mode;
entry->stages[2].mode = a->mode;
entry->stages[3].mode = b->mode;
oidcpy(&entry->stages[1].oid, &o->oid);
oidcpy(&entry->stages[2].oid, &a->oid);
oidcpy(&entry->stages[3].oid, &b->oid);
}
static int remove_file(struct merge_options *o, int clean,
const char *path, int no_wd)
{
int update_cache = o->call_depth || clean;
int update_working_directory = !o->call_depth && !no_wd;
if (update_cache) {
if (remove_file_from_cache(path))
return -1;
}
if (update_working_directory) {
if (ignore_case) {
struct cache_entry *ce;
ce = cache_file_exists(path, strlen(path), ignore_case);
if (ce && ce_stage(ce) == 0)
return 0;
}
if (remove_path(path))
return -1;
}
return 0;
}
/* add a string to a strbuf, but converting "/" to "_" */
static void add_flattened_path(struct strbuf *out, const char *s)
{
size_t i = out->len;
strbuf_addstr(out, s);
for (; i < out->len; i++)
if (out->buf[i] == '/')
out->buf[i] = '_';
}
static char *unique_path(struct merge_options *o, const char *path, const char *branch)
{
struct strbuf newpath = STRBUF_INIT;
int suffix = 0;
size_t base_len;
strbuf_addf(&newpath, "%s~", path);
add_flattened_path(&newpath, branch);
base_len = newpath.len;
while (string_list_has_string(&o->current_file_set, newpath.buf) ||
string_list_has_string(&o->current_directory_set, newpath.buf) ||
(!o->call_depth && file_exists(newpath.buf))) {
strbuf_setlen(&newpath, base_len);
strbuf_addf(&newpath, "_%d", suffix++);
}
string_list_insert(&o->current_file_set, newpath.buf);
return strbuf_detach(&newpath, NULL);
}
/**
* Check whether a directory in the index is in the way of an incoming
* file. Return 1 if so. If check_working_copy is non-zero, also
* check the working directory. If empty_ok is non-zero, also return
* 0 in the case where the working-tree dir exists but is empty.
*/
static int dir_in_way(const char *path, int check_working_copy, int empty_ok)
{
int pos;
struct strbuf dirpath = STRBUF_INIT;
struct stat st;
strbuf_addstr(&dirpath, path);
strbuf_addch(&dirpath, '/');
pos = cache_name_pos(dirpath.buf, dirpath.len);
if (pos < 0)
pos = -1 - pos;
if (pos < active_nr &&
!strncmp(dirpath.buf, active_cache[pos]->name, dirpath.len)) {
strbuf_release(&dirpath);
return 1;
}
strbuf_release(&dirpath);
return check_working_copy && !lstat(path, &st) && S_ISDIR(st.st_mode) &&
!(empty_ok && is_empty_dir(path));
}
static int was_tracked(const char *path)
{
int pos = cache_name_pos(path, strlen(path));
if (0 <= pos)
/* we have been tracking this path */
return 1;
/*
* Look for an unmerged entry for the path,
* specifically stage #2, which would indicate
* that "our" side before the merge started
* had the path tracked (and resulted in a conflict).
*/
for (pos = -1 - pos;
pos < active_nr && !strcmp(path, active_cache[pos]->name);
pos++)
if (ce_stage(active_cache[pos]) == 2)
return 1;
return 0;
}
static int would_lose_untracked(const char *path)
{
return !was_tracked(path) && file_exists(path);
}
static int make_room_for_path(struct merge_options *o, const char *path)
{
int status, i;
const char *msg = _("failed to create path '%s'%s");
/* Unlink any D/F conflict files that are in the way */
for (i = 0; i < o->df_conflict_file_set.nr; i++) {
const char *df_path = o->df_conflict_file_set.items[i].string;
size_t pathlen = strlen(path);
size_t df_pathlen = strlen(df_path);
if (df_pathlen < pathlen &&
path[df_pathlen] == '/' &&
strncmp(path, df_path, df_pathlen) == 0) {
output(o, 3,
_("Removing %s to make room for subdirectory\n"),
df_path);
unlink(df_path);
unsorted_string_list_delete_item(&o->df_conflict_file_set,
i, 0);
break;
}
}
/* Make sure leading directories are created */
status = safe_create_leading_directories_const(path);
if (status) {
if (status == SCLD_EXISTS)
/* something else exists */
return err(o, msg, path, _(": perhaps a D/F conflict?"));
return err(o, msg, path, "");
}
/*
* Do not unlink a file in the work tree if we are not
* tracking it.
*/
if (would_lose_untracked(path))
return err(o, _("refusing to lose untracked file at '%s'"),
path);
/* Successful unlink is good.. */
if (!unlink(path))
return 0;
/* .. and so is no existing file */
if (errno == ENOENT)
return 0;
/* .. but not some other error (who really cares what?) */
return err(o, msg, path, _(": perhaps a D/F conflict?"));
}
static int update_file_flags(struct merge_options *o,
const struct object_id *oid,
unsigned mode,
const char *path,
int update_cache,
int update_wd)
{
int ret = 0;
if (o->call_depth)
update_wd = 0;
if (update_wd) {
enum object_type type;
void *buf;
unsigned long size;
if (S_ISGITLINK(mode)) {
/*
* We may later decide to recursively descend into
* the submodule directory and update its index
* and/or work tree, but we do not do that now.
*/
update_wd = 0;
goto update_index;
}
buf = read_sha1_file(oid->hash, &type, &size);
if (!buf)
return err(o, _("cannot read object %s '%s'"), oid_to_hex(oid), path);
if (type != OBJ_BLOB) {
ret = err(o, _("blob expected for %s '%s'"), oid_to_hex(oid), path);
goto free_buf;
}
if (S_ISREG(mode)) {
struct strbuf strbuf = STRBUF_INIT;
if (convert_to_working_tree(path, buf, size, &strbuf)) {
free(buf);
size = strbuf.len;
buf = strbuf_detach(&strbuf, NULL);
}
}
if (make_room_for_path(o, path) < 0) {
update_wd = 0;
goto free_buf;
}
if (S_ISREG(mode) || (!has_symlinks && S_ISLNK(mode))) {
int fd;
if (mode & 0100)
mode = 0777;
else
mode = 0666;
fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
if (fd < 0) {
ret = err(o, _("failed to open '%s': %s"),
path, strerror(errno));
goto free_buf;
}
write_in_full(fd, buf, size);
close(fd);
} else if (S_ISLNK(mode)) {
char *lnk = xmemdupz(buf, size);
safe_create_leading_directories_const(path);
unlink(path);
if (symlink(lnk, path))
ret = err(o, _("failed to symlink '%s': %s"),
path, strerror(errno));
free(lnk);
} else
ret = err(o,
_("do not know what to do with %06o %s '%s'"),
mode, oid_to_hex(oid), path);
free_buf:
free(buf);
}
update_index:
if (!ret && update_cache)
add_cacheinfo(o, mode, oid, path, 0, update_wd, ADD_CACHE_OK_TO_ADD);
return ret;
}
static int update_file(struct merge_options *o,
int clean,
const struct object_id *oid,
unsigned mode,
const char *path)
{
return update_file_flags(o, oid, mode, path, o->call_depth || clean, !o->call_depth);
}
/* Low level file merging, update and removal */
struct merge_file_info {
struct object_id oid;
unsigned mode;
unsigned clean:1,
merge:1;
};
static int merge_3way(struct merge_options *o,
mmbuffer_t *result_buf,
const struct diff_filespec *one,
const struct diff_filespec *a,
const struct diff_filespec *b,
const char *branch1,
const char *branch2)
{
mmfile_t orig, src1, src2;
struct ll_merge_options ll_opts = {0};
char *base_name, *name1, *name2;
int merge_status;
ll_opts.renormalize = o->renormalize;
ll_opts.xdl_opts = o->xdl_opts;
if (o->call_depth) {
ll_opts.virtual_ancestor = 1;
ll_opts.variant = 0;
} else {
switch (o->recursive_variant) {
case MERGE_RECURSIVE_OURS:
ll_opts.variant = XDL_MERGE_FAVOR_OURS;
break;
case MERGE_RECURSIVE_THEIRS:
ll_opts.variant = XDL_MERGE_FAVOR_THEIRS;
break;
default:
ll_opts.variant = 0;
break;
}
}
if (strcmp(a->path, b->path) ||
(o->ancestor != NULL && strcmp(a->path, one->path) != 0)) {
base_name = o->ancestor == NULL ? NULL :
mkpathdup("%s:%s", o->ancestor, one->path);
name1 = mkpathdup("%s:%s", branch1, a->path);
name2 = mkpathdup("%s:%s", branch2, b->path);
} else {
base_name = o->ancestor == NULL ? NULL :
mkpathdup("%s", o->ancestor);
name1 = mkpathdup("%s", branch1);
name2 = mkpathdup("%s", branch2);
}
read_mmblob(&orig, &one->oid);
read_mmblob(&src1, &a->oid);
read_mmblob(&src2, &b->oid);
merge_status = ll_merge(result_buf, a->path, &orig, base_name,
&src1, name1, &src2, name2, &ll_opts);
free(base_name);
free(name1);
free(name2);
free(orig.ptr);
free(src1.ptr);
free(src2.ptr);
return merge_status;
}
static int merge_file_1(struct merge_options *o,
const struct diff_filespec *one,
const struct diff_filespec *a,
const struct diff_filespec *b,
const char *branch1,
const char *branch2,
struct merge_file_info *result)
{
result->merge = 0;
result->clean = 1;
if ((S_IFMT & a->mode) != (S_IFMT & b->mode)) {
result->clean = 0;
if (S_ISREG(a->mode)) {
result->mode = a->mode;
oidcpy(&result->oid, &a->oid);
} else {
result->mode = b->mode;
oidcpy(&result->oid, &b->oid);
}
} else {
if (!oid_eq(&a->oid, &one->oid) && !oid_eq(&b->oid, &one->oid))
result->merge = 1;
/*
* Merge modes
*/
if (a->mode == b->mode || a->mode == one->mode)
result->mode = b->mode;
else {
result->mode = a->mode;
if (b->mode != one->mode) {
result->clean = 0;
result->merge = 1;
}
}
if (oid_eq(&a->oid, &b->oid) || oid_eq(&a->oid, &one->oid))
oidcpy(&result->oid, &b->oid);
else if (oid_eq(&b->oid, &one->oid))
oidcpy(&result->oid, &a->oid);
else if (S_ISREG(a->mode)) {
mmbuffer_t result_buf;
int ret = 0, merge_status;
merge_status = merge_3way(o, &result_buf, one, a, b,
branch1, branch2);
if ((merge_status < 0) || !result_buf.ptr)
ret = err(o, _("Failed to execute internal merge"));
if (!ret && write_sha1_file(result_buf.ptr, result_buf.size,
blob_type, result->oid.hash))
ret = err(o, _("Unable to add %s to database"),
a->path);
free(result_buf.ptr);
if (ret)
return ret;
result->clean = (merge_status == 0);
} else if (S_ISGITLINK(a->mode)) {
result->clean = merge_submodule(result->oid.hash,
one->path,
one->oid.hash,
a->oid.hash,
b->oid.hash,
!o->call_depth);
} else if (S_ISLNK(a->mode)) {
oidcpy(&result->oid, &a->oid);
if (!oid_eq(&a->oid, &b->oid))
result->clean = 0;
} else
die("BUG: unsupported object type in the tree");
}
return 0;
}
static int merge_file_special_markers(struct merge_options *o,
const struct diff_filespec *one,
const struct diff_filespec *a,
const struct diff_filespec *b,
const char *branch1,
const char *filename1,
const char *branch2,
const char *filename2,
struct merge_file_info *mfi)
{
char *side1 = NULL;
char *side2 = NULL;
int ret;
if (filename1)
side1 = xstrfmt("%s:%s", branch1, filename1);
if (filename2)
side2 = xstrfmt("%s:%s", branch2, filename2);
ret = merge_file_1(o, one, a, b,
side1 ? side1 : branch1,
side2 ? side2 : branch2, mfi);
free(side1);
free(side2);
return ret;
}
static int merge_file_one(struct merge_options *o,
const char *path,
const struct object_id *o_oid, int o_mode,
const struct object_id *a_oid, int a_mode,
const struct object_id *b_oid, int b_mode,
const char *branch1,
const char *branch2,
struct merge_file_info *mfi)
{
struct diff_filespec one, a, b;
one.path = a.path = b.path = (char *)path;
oidcpy(&one.oid, o_oid);
one.mode = o_mode;
oidcpy(&a.oid, a_oid);
a.mode = a_mode;
oidcpy(&b.oid, b_oid);
b.mode = b_mode;
return merge_file_1(o, &one, &a, &b, branch1, branch2, mfi);
}
static int handle_change_delete(struct merge_options *o,
const char *path, const char *old_path,
const struct object_id *o_oid, int o_mode,
const struct object_id *changed_oid,
int changed_mode,
const char *change_branch,
const char *delete_branch,
const char *change, const char *change_past)
{
char *alt_path = NULL;
const char *update_path = path;
int ret = 0;
if (dir_in_way(path, !o->call_depth, 0)) {
update_path = alt_path = unique_path(o, path, change_branch);
}
if (o->call_depth) {
/*
* We cannot arbitrarily accept either a_sha or b_sha as
* correct; since there is no true "middle point" between
* them, simply reuse the base version for virtual merge base.
*/
ret = remove_file_from_cache(path);
if (!ret)
ret = update_file(o, 0, o_oid, o_mode, update_path);
} else {
if (!alt_path) {
if (!old_path) {
output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
"and %s in %s. Version %s of %s left in tree."),
change, path, delete_branch, change_past,
change_branch, change_branch, path);
} else {
output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
"and %s to %s in %s. Version %s of %s left in tree."),
change, old_path, delete_branch, change_past, path,
change_branch, change_branch, path);
}
} else {
if (!old_path) {
output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
"and %s in %s. Version %s of %s left in tree at %s."),
change, path, delete_branch, change_past,
change_branch, change_branch, path, alt_path);
} else {
output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
"and %s to %s in %s. Version %s of %s left in tree at %s."),
change, old_path, delete_branch, change_past, path,
change_branch, change_branch, path, alt_path);
}
}
/*
* No need to call update_file() on path when change_branch ==
* o->branch1 && !alt_path, since that would needlessly touch
* path. We could call update_file_flags() with update_cache=0
* and update_wd=0, but that's a no-op.
*/
if (change_branch != o->branch1 || alt_path)
ret = update_file(o, 0, changed_oid, changed_mode, update_path);
}
free(alt_path);
return ret;
}
static int conflict_rename_delete(struct merge_options *o,
struct diff_filepair *pair,
const char *rename_branch,
const char *delete_branch)
{
const struct diff_filespec *orig = pair->one;
const struct diff_filespec *dest = pair->two;
if (handle_change_delete(o,
o->call_depth ? orig->path : dest->path,
o->call_depth ? NULL : orig->path,
&orig->oid, orig->mode,
&dest->oid, dest->mode,
rename_branch, delete_branch,
_("rename"), _("renamed")))
return -1;
if (o->call_depth)
return remove_file_from_cache(dest->path);
else
return update_stages(o, dest->path, NULL,
rename_branch == o->branch1 ? dest : NULL,
rename_branch == o->branch1 ? NULL : dest);
}
static struct diff_filespec *filespec_from_entry(struct diff_filespec *target,
struct stage_data *entry,
int stage)
{
struct object_id *oid = &entry->stages[stage].oid;
unsigned mode = entry->stages[stage].mode;
if (mode == 0 || is_null_oid(oid))
return NULL;
oidcpy(&target->oid, oid);
target->mode = mode;
return target;
}
static int handle_file(struct merge_options *o,
struct diff_filespec *rename,
int stage,
struct rename_conflict_info *ci)
{
char *dst_name = rename->path;
struct stage_data *dst_entry;
const char *cur_branch, *other_branch;
struct diff_filespec other;
struct diff_filespec *add;
int ret;
if (stage == 2) {
dst_entry = ci->dst_entry1;
cur_branch = ci->branch1;
other_branch = ci->branch2;
} else {
dst_entry = ci->dst_entry2;
cur_branch = ci->branch2;
other_branch = ci->branch1;
}
add = filespec_from_entry(&other, dst_entry, stage ^ 1);
if (add) {
char *add_name = unique_path(o, rename->path, other_branch);
if (update_file(o, 0, &add->oid, add->mode, add_name))
return -1;
remove_file(o, 0, rename->path, 0);
dst_name = unique_path(o, rename->path, cur_branch);
} else {
if (dir_in_way(rename->path, !o->call_depth, 0)) {
dst_name = unique_path(o, rename->path, cur_branch);
output(o, 1, _("%s is a directory in %s adding as %s instead"),
rename->path, other_branch, dst_name);
}
}
if ((ret = update_file(o, 0, &rename->oid, rename->mode, dst_name)))
; /* fall through, do allow dst_name to be released */
else if (stage == 2)
ret = update_stages(o, rename->path, NULL, rename, add);
else
ret = update_stages(o, rename->path, NULL, add, rename);
if (dst_name != rename->path)
free(dst_name);
return ret;
}
static int conflict_rename_rename_1to2(struct merge_options *o,
struct rename_conflict_info *ci)
{
/* One file was renamed in both branches, but to different names. */
struct diff_filespec *one = ci->pair1->one;
struct diff_filespec *a = ci->pair1->two;
struct diff_filespec *b = ci->pair2->two;
output(o, 1, _("CONFLICT (rename/rename): "
"Rename \"%s\"->\"%s\" in branch \"%s\" "
"rename \"%s\"->\"%s\" in \"%s\"%s"),
one->path, a->path, ci->branch1,
one->path, b->path, ci->branch2,
o->call_depth ? _(" (left unresolved)") : "");
if (o->call_depth) {
struct merge_file_info mfi;
struct diff_filespec other;
struct diff_filespec *add;
if (merge_file_one(o, one->path,
&one->oid, one->mode,
&a->oid, a->mode,
&b->oid, b->mode,
ci->branch1, ci->branch2, &mfi))
return -1;
/*
* FIXME: For rename/add-source conflicts (if we could detect
* such), this is wrong. We should instead find a unique
* pathname and then either rename the add-source file to that
* unique path, or use that unique path instead of src here.
*/
if (update_file(o, 0, &mfi.oid, mfi.mode, one->path))
return -1;
/*
* Above, we put the merged content at the merge-base's
* path. Now we usually need to delete both a->path and
* b->path. However, the rename on each side of the merge
* could also be involved in a rename/add conflict. In
* such cases, we should keep the added file around,
* resolving the conflict at that path in its favor.
*/
add = filespec_from_entry(&other, ci->dst_entry1, 2 ^ 1);
if (add) {
if (update_file(o, 0, &add->oid, add->mode, a->path))
return -1;
}
else
remove_file_from_cache(a->path);
add = filespec_from_entry(&other, ci->dst_entry2, 3 ^ 1);
if (add) {
if (update_file(o, 0, &add->oid, add->mode, b->path))
return -1;
}
else
remove_file_from_cache(b->path);
} else if (handle_file(o, a, 2, ci) || handle_file(o, b, 3, ci))
return -1;
return 0;
}
static int conflict_rename_rename_2to1(struct merge_options *o,
struct rename_conflict_info *ci)
{
/* Two files, a & b, were renamed to the same thing, c. */
struct diff_filespec *a = ci->pair1->one;
struct diff_filespec *b = ci->pair2->one;
struct diff_filespec *c1 = ci->pair1->two;
struct diff_filespec *c2 = ci->pair2->two;
char *path = c1->path; /* == c2->path */
struct merge_file_info mfi_c1;
struct merge_file_info mfi_c2;
int ret;
output(o, 1, _("CONFLICT (rename/rename): "
"Rename %s->%s in %s. "
"Rename %s->%s in %s"),
a->path, c1->path, ci->branch1,
b->path, c2->path, ci->branch2);
remove_file(o, 1, a->path, o->call_depth || would_lose_untracked(a->path));
remove_file(o, 1, b->path, o->call_depth || would_lose_untracked(b->path));
if (merge_file_special_markers(o, a, c1, &ci->ren1_other,
o->branch1, c1->path,
o->branch2, ci->ren1_other.path, &mfi_c1) ||
merge_file_special_markers(o, b, &ci->ren2_other, c2,
o->branch1, ci->ren2_other.path,
o->branch2, c2->path, &mfi_c2))
return -1;
if (o->call_depth) {
/*
* If mfi_c1.clean && mfi_c2.clean, then it might make
* sense to do a two-way merge of those results. But, I
* think in all cases, it makes sense to have the virtual
* merge base just undo the renames; they can be detected
* again later for the non-recursive merge.
*/
remove_file(o, 0, path, 0);
ret = update_file(o, 0, &mfi_c1.oid, mfi_c1.mode, a->path);
if (!ret)
ret = update_file(o, 0, &mfi_c2.oid, mfi_c2.mode,
b->path);
} else {
char *new_path1 = unique_path(o, path, ci->branch1);
char *new_path2 = unique_path(o, path, ci->branch2);
output(o, 1, _("Renaming %s to %s and %s to %s instead"),
a->path, new_path1, b->path, new_path2);
remove_file(o, 0, path, 0);
ret = update_file(o, 0, &mfi_c1.oid, mfi_c1.mode, new_path1);
if (!ret)
ret = update_file(o, 0, &mfi_c2.oid, mfi_c2.mode,
new_path2);
free(new_path2);
free(new_path1);
}
return ret;
}
static int process_renames(struct merge_options *o,
struct string_list *a_renames,
struct string_list *b_renames)
{
int clean_merge = 1, i, j;
struct string_list a_by_dst = STRING_LIST_INIT_NODUP;
struct string_list b_by_dst = STRING_LIST_INIT_NODUP;
const struct rename *sre;
for (i = 0; i < a_renames->nr; i++) {
sre = a_renames->items[i].util;
string_list_insert(&a_by_dst, sre->pair->two->path)->util
= (void *)sre;
}
for (i = 0; i < b_renames->nr; i++) {
sre = b_renames->items[i].util;
string_list_insert(&b_by_dst, sre->pair->two->path)->util
= (void *)sre;
}
for (i = 0, j = 0; i < a_renames->nr || j < b_renames->nr;) {
struct string_list *renames1, *renames2Dst;
struct rename *ren1 = NULL, *ren2 = NULL;
const char *branch1, *branch2;
const char *ren1_src, *ren1_dst;
struct string_list_item *lookup;
if (i >= a_renames->nr) {
ren2 = b_renames->items[j++].util;
} else if (j >= b_renames->nr) {
ren1 = a_renames->items[i++].util;
} else {
int compare = strcmp(a_renames->items[i].string,
b_renames->items[j].string);
if (compare <= 0)
ren1 = a_renames->items[i++].util;
if (compare >= 0)
ren2 = b_renames->items[j++].util;
}
/* TODO: refactor, so that 1/2 are not needed */
if (ren1) {
renames1 = a_renames;
renames2Dst = &b_by_dst;
branch1 = o->branch1;
branch2 = o->branch2;
} else {
renames1 = b_renames;
renames2Dst = &a_by_dst;
branch1 = o->branch2;
branch2 = o->branch1;
SWAP(ren2, ren1);
}
if (ren1->processed)
continue;
ren1->processed = 1;
ren1->dst_entry->processed = 1;
/* BUG: We should only mark src_entry as processed if we
* are not dealing with a rename + add-source case.
*/
ren1->src_entry->processed = 1;
ren1_src = ren1->pair->one->path;
ren1_dst = ren1->pair->two->path;
if (ren2) {
/* One file renamed on both sides */
const char *ren2_src = ren2->pair->one->path;
const char *ren2_dst = ren2->pair->two->path;
enum rename_type rename_type;
if (strcmp(ren1_src, ren2_src) != 0)
die("BUG: ren1_src != ren2_src");
ren2->dst_entry->processed = 1;
ren2->processed = 1;
if (strcmp(ren1_dst, ren2_dst) != 0) {
rename_type = RENAME_ONE_FILE_TO_TWO;
clean_merge = 0;
} else {
rename_type = RENAME_ONE_FILE_TO_ONE;
/* BUG: We should only remove ren1_src in
* the base stage (think of rename +
* add-source cases).
*/
remove_file(o, 1, ren1_src, 1);
update_entry(ren1->dst_entry,
ren1->pair->one,
ren1->pair->two,
ren2->pair->two);
}
setup_rename_conflict_info(rename_type,
ren1->pair,
ren2->pair,
branch1,
branch2,
ren1->dst_entry,
ren2->dst_entry,
o,
NULL,
NULL);
} else if ((lookup = string_list_lookup(renames2Dst, ren1_dst))) {
/* Two different files renamed to the same thing */
char *ren2_dst;
ren2 = lookup->util;
ren2_dst = ren2->pair->two->path;
if (strcmp(ren1_dst, ren2_dst) != 0)
die("BUG: ren1_dst != ren2_dst");
clean_merge = 0;
ren2->processed = 1;
/*
* BUG: We should only mark src_entry as processed
* if we are not dealing with a rename + add-source
* case.
*/
ren2->src_entry->processed = 1;
setup_rename_conflict_info(RENAME_TWO_FILES_TO_ONE,
ren1->pair,
ren2->pair,
branch1,
branch2,
ren1->dst_entry,
ren2->dst_entry,
o,
ren1->src_entry,
ren2->src_entry);
} else {
/* Renamed in 1, maybe changed in 2 */
/* we only use sha1 and mode of these */
struct diff_filespec src_other, dst_other;
int try_merge;
/*
* unpack_trees loads entries from common-commit
* into stage 1, from head-commit into stage 2, and
* from merge-commit into stage 3. We keep track
* of which side corresponds to the rename.
*/
int renamed_stage = a_renames == renames1 ? 2 : 3;
int other_stage = a_renames == renames1 ? 3 : 2;
/* BUG: We should only remove ren1_src in the base
* stage and in other_stage (think of rename +
* add-source case).
*/
remove_file(o, 1, ren1_src,
renamed_stage == 2 || !was_tracked(ren1_src));
oidcpy(&src_other.oid,
&ren1->src_entry->stages[other_stage].oid);
src_other.mode = ren1->src_entry->stages[other_stage].mode;
oidcpy(&dst_other.oid,
&ren1->dst_entry->stages[other_stage].oid);
dst_other.mode = ren1->dst_entry->stages[other_stage].mode;
try_merge = 0;
if (oid_eq(&src_other.oid, &null_oid)) {
setup_rename_conflict_info(RENAME_DELETE,
ren1->pair,
NULL,
branch1,
branch2,
ren1->dst_entry,
NULL,
o,
NULL,
NULL);
} else if ((dst_other.mode == ren1->pair->two->mode) &&
oid_eq(&dst_other.oid, &ren1->pair->two->oid)) {
/*
* Added file on the other side identical to
* the file being renamed: clean merge.
* Also, there is no need to overwrite the
* file already in the working copy, so call
* update_file_flags() instead of
* update_file().
*/
if (update_file_flags(o,
&ren1->pair->two->oid,
ren1->pair->two->mode,
ren1_dst,
1, /* update_cache */
0 /* update_wd */))
clean_merge = -1;
} else if (!oid_eq(&dst_other.oid, &null_oid)) {
clean_merge = 0;
try_merge = 1;
output(o, 1, _("CONFLICT (rename/add): Rename %s->%s in %s. "
"%s added in %s"),
ren1_src, ren1_dst, branch1,
ren1_dst, branch2);
if (o->call_depth) {
struct merge_file_info mfi;
if (merge_file_one(o, ren1_dst, &null_oid, 0,
&ren1->pair->two->oid,
ren1->pair->two->mode,
&dst_other.oid,
dst_other.mode,
branch1, branch2, &mfi)) {
clean_merge = -1;
goto cleanup_and_return;
}
output(o, 1, _("Adding merged %s"), ren1_dst);
if (update_file(o, 0, &mfi.oid,
mfi.mode, ren1_dst))
clean_merge = -1;
try_merge = 0;
} else {
char *new_path = unique_path(o, ren1_dst, branch2);
output(o, 1, _("Adding as %s instead"), new_path);
if (update_file(o, 0, &dst_other.oid,
dst_other.mode, new_path))
clean_merge = -1;
free(new_path);
}
} else
try_merge = 1;
if (clean_merge < 0)
goto cleanup_and_return;
if (try_merge) {
struct diff_filespec *one, *a, *b;
src_other.path = (char *)ren1_src;
one = ren1->pair->one;
if (a_renames == renames1) {
a = ren1->pair->two;
b = &src_other;
} else {
b = ren1->pair->two;
a = &src_other;
}
update_entry(ren1->dst_entry, one, a, b);
setup_rename_conflict_info(RENAME_NORMAL,
ren1->pair,
NULL,
branch1,
NULL,
ren1->dst_entry,
NULL,
o,
NULL,
NULL);
}
}
}
cleanup_and_return:
string_list_clear(&a_by_dst, 0);
string_list_clear(&b_by_dst, 0);
return clean_merge;
}
static struct object_id *stage_oid(const struct object_id *oid, unsigned mode)
{
return (is_null_oid(oid) || mode == 0) ? NULL: (struct object_id *)oid;
}
static int read_oid_strbuf(struct merge_options *o,
const struct object_id *oid, struct strbuf *dst)
{
void *buf;
enum object_type type;
unsigned long size;
buf = read_sha1_file(oid->hash, &type, &size);
if (!buf)
return err(o, _("cannot read object %s"), oid_to_hex(oid));
if (type != OBJ_BLOB) {
free(buf);
return err(o, _("object %s is not a blob"), oid_to_hex(oid));
}
strbuf_attach(dst, buf, size, size + 1);
return 0;
}
static int blob_unchanged(struct merge_options *opt,
const struct object_id *o_oid,
unsigned o_mode,
const struct object_id *a_oid,
unsigned a_mode,
int renormalize, const char *path)
{
struct strbuf o = STRBUF_INIT;
struct strbuf a = STRBUF_INIT;
int ret = 0; /* assume changed for safety */
if (a_mode != o_mode)
return 0;
if (oid_eq(o_oid, a_oid))
return 1;
if (!renormalize)
return 0;
assert(o_oid && a_oid);
if (read_oid_strbuf(opt, o_oid, &o) || read_oid_strbuf(opt, a_oid, &a))
goto error_return;
/*
* Note: binary | is used so that both renormalizations are
* performed. Comparison can be skipped if both files are
* unchanged since their sha1s have already been compared.
*/
if (renormalize_buffer(path, o.buf, o.len, &o) |
renormalize_buffer(path, a.buf, a.len, &a))
ret = (o.len == a.len && !memcmp(o.buf, a.buf, o.len));
error_return:
strbuf_release(&o);
strbuf_release(&a);
return ret;
}
static int handle_modify_delete(struct merge_options *o,
const char *path,
struct object_id *o_oid, int o_mode,
struct object_id *a_oid, int a_mode,
struct object_id *b_oid, int b_mode)
{
const char *modify_branch, *delete_branch;
struct object_id *changed_oid;
int changed_mode;
if (a_oid) {
modify_branch = o->branch1;
delete_branch = o->branch2;
changed_oid = a_oid;
changed_mode = a_mode;
} else {
modify_branch = o->branch2;
delete_branch = o->branch1;
changed_oid = b_oid;
changed_mode = b_mode;
}
return handle_change_delete(o,
path, NULL,
o_oid, o_mode,
changed_oid, changed_mode,
modify_branch, delete_branch,
_("modify"), _("modified"));
}
static int merge_content(struct merge_options *o,
const char *path,
struct object_id *o_oid, int o_mode,
struct object_id *a_oid, int a_mode,
struct object_id *b_oid, int b_mode,
struct rename_conflict_info *rename_conflict_info)
{
const char *reason = _("content");
const char *path1 = NULL, *path2 = NULL;
struct merge_file_info mfi;
struct diff_filespec one, a, b;
unsigned df_conflict_remains = 0;
if (!o_oid) {
reason = _("add/add");
o_oid = (struct object_id *)&null_oid;
}
one.path = a.path = b.path = (char *)path;
oidcpy(&one.oid, o_oid);
one.mode = o_mode;
oidcpy(&a.oid, a_oid);
a.mode = a_mode;
oidcpy(&b.oid, b_oid);
b.mode = b_mode;
if (rename_conflict_info) {
struct diff_filepair *pair1 = rename_conflict_info->pair1;
path1 = (o->branch1 == rename_conflict_info->branch1) ?
pair1->two->path : pair1->one->path;
/* If rename_conflict_info->pair2 != NULL, we are in
* RENAME_ONE_FILE_TO_ONE case. Otherwise, we have a
* normal rename.
*/
path2 = (rename_conflict_info->pair2 ||
o->branch2 == rename_conflict_info->branch1) ?
pair1->two->path : pair1->one->path;
if (dir_in_way(path, !o->call_depth,
S_ISGITLINK(pair1->two->mode)))
df_conflict_remains = 1;
}
if (merge_file_special_markers(o, &one, &a, &b,
o->branch1, path1,
o->branch2, path2, &mfi))
return -1;
if (mfi.clean && !df_conflict_remains &&
oid_eq(&mfi.oid, a_oid) && mfi.mode == a_mode) {
int path_renamed_outside_HEAD;
output(o, 3, _("Skipped %s (merged same as existing)"), path);
/*
* The content merge resulted in the same file contents we
* already had. We can return early if those file contents
* are recorded at the correct path (which may not be true
* if the merge involves a rename).
*/
path_renamed_outside_HEAD = !path2 || !strcmp(path, path2);
if (!path_renamed_outside_HEAD) {
add_cacheinfo(o, mfi.mode, &mfi.oid, path,
0, (!o->call_depth), 0);
return mfi.clean;
}
} else
output(o, 2, _("Auto-merging %s"), path);
if (!mfi.clean) {
if (S_ISGITLINK(mfi.mode))
reason = _("submodule");
output(o, 1, _("CONFLICT (%s): Merge conflict in %s"),
reason, path);
if (rename_conflict_info && !df_conflict_remains)
if (update_stages(o, path, &one, &a, &b))
return -1;
}
if (df_conflict_remains) {
char *new_path;
if (o->call_depth) {
remove_file_from_cache(path);
} else {
if (!mfi.clean) {
if (update_stages(o, path, &one, &a, &b))
return -1;
} else {
int file_from_stage2 = was_tracked(path);
struct diff_filespec merged;
oidcpy(&merged.oid, &mfi.oid);
merged.mode = mfi.mode;
if (update_stages(o, path, NULL,
file_from_stage2 ? &merged : NULL,
file_from_stage2 ? NULL : &merged))
return -1;
}
}
new_path = unique_path(o, path, rename_conflict_info->branch1);
output(o, 1, _("Adding as %s instead"), new_path);
if (update_file(o, 0, &mfi.oid, mfi.mode, new_path)) {
free(new_path);
return -1;
}
free(new_path);
mfi.clean = 0;
} else if (update_file(o, mfi.clean, &mfi.oid, mfi.mode, path))
return -1;
return mfi.clean;
}
/* Per entry merge function */
static int process_entry(struct merge_options *o,
const char *path, struct stage_data *entry)
{
int clean_merge = 1;
int normalize = o->renormalize;
unsigned o_mode = entry->stages[1].mode;
unsigned a_mode = entry->stages[2].mode;
unsigned b_mode = entry->stages[3].mode;
struct object_id *o_oid = stage_oid(&entry->stages[1].oid, o_mode);
struct object_id *a_oid = stage_oid(&entry->stages[2].oid, a_mode);
struct object_id *b_oid = stage_oid(&entry->stages[3].oid, b_mode);
entry->processed = 1;
if (entry->rename_conflict_info) {
struct rename_conflict_info *conflict_info = entry->rename_conflict_info;
switch (conflict_info->rename_type) {
case RENAME_NORMAL:
case RENAME_ONE_FILE_TO_ONE:
clean_merge = merge_content(o, path,
o_oid, o_mode, a_oid, a_mode, b_oid, b_mode,
conflict_info);
break;
case RENAME_DELETE:
clean_merge = 0;
if (conflict_rename_delete(o,
conflict_info->pair1,
conflict_info->branch1,
conflict_info->branch2))
clean_merge = -1;
break;
case RENAME_ONE_FILE_TO_TWO:
clean_merge = 0;
if (conflict_rename_rename_1to2(o, conflict_info))
clean_merge = -1;
break;
case RENAME_TWO_FILES_TO_ONE:
clean_merge = 0;
if (conflict_rename_rename_2to1(o, conflict_info))
clean_merge = -1;
break;
default:
entry->processed = 0;
break;
}
} else if (o_oid && (!a_oid || !b_oid)) {
/* Case A: Deleted in one */
if ((!a_oid && !b_oid) ||
(!b_oid && blob_unchanged(o, o_oid, o_mode, a_oid, a_mode, normalize, path)) ||
(!a_oid && blob_unchanged(o, o_oid, o_mode, b_oid, b_mode, normalize, path))) {
/* Deleted in both or deleted in one and
* unchanged in the other */
if (a_oid)
output(o, 2, _("Removing %s"), path);
/* do not touch working file if it did not exist */
remove_file(o, 1, path, !a_oid);
} else {
/* Modify/delete; deleted side may have put a directory in the way */
clean_merge = 0;
if (handle_modify_delete(o, path, o_oid, o_mode,
a_oid, a_mode, b_oid, b_mode))
clean_merge = -1;
}
} else if ((!o_oid && a_oid && !b_oid) ||
(!o_oid && !a_oid && b_oid)) {
/* Case B: Added in one. */
/* [nothing|directory] -> ([nothing|directory], file) */
const char *add_branch;
const char *other_branch;
unsigned mode;
const struct object_id *oid;
const char *conf;
if (a_oid) {
add_branch = o->branch1;
other_branch = o->branch2;
mode = a_mode;
oid = a_oid;
conf = _("file/directory");
} else {
add_branch = o->branch2;
other_branch = o->branch1;
mode = b_mode;
oid = b_oid;
conf = _("directory/file");
}
if (dir_in_way(path, !o->call_depth,
S_ISGITLINK(a_mode))) {
char *new_path = unique_path(o, path, add_branch);
clean_merge = 0;
output(o, 1, _("CONFLICT (%s): There is a directory with name %s in %s. "
"Adding %s as %s"),
conf, path, other_branch, path, new_path);
if (update_file(o, 0, oid, mode, new_path))
clean_merge = -1;
else if (o->call_depth)
remove_file_from_cache(path);
free(new_path);
} else {
output(o, 2, _("Adding %s"), path);
/* do not overwrite file if already present */
if (update_file_flags(o, oid, mode, path, 1, !a_oid))
clean_merge = -1;
}
} else if (a_oid && b_oid) {
/* Case C: Added in both (check for same permissions) and */
/* case D: Modified in both, but differently. */
clean_merge = merge_content(o, path,
o_oid, o_mode, a_oid, a_mode, b_oid, b_mode,
NULL);
} else if (!o_oid && !a_oid && !b_oid) {
/*
* this entry was deleted altogether. a_mode == 0 means
* we had that path and want to actively remove it.
*/
remove_file(o, 1, path, !a_mode);
} else
die("BUG: fatal merge failure, shouldn't happen.");
return clean_merge;
}
int merge_trees(struct merge_options *o,
struct tree *head,
struct tree *merge,
struct tree *common,
struct tree **result)
{
int code, clean;
if (o->subtree_shift) {
merge = shift_tree_object(head, merge, o->subtree_shift);
common = shift_tree_object(head, common, o->subtree_shift);
}
if (oid_eq(&common->object.oid, &merge->object.oid)) {
output(o, 0, _("Already up-to-date!"));
*result = head;
return 1;
}
code = git_merge_trees(o->call_depth, common, head, merge);
if (code != 0) {
if (show(o, 4) || o->call_depth)
err(o, _("merging of trees %s and %s failed"),
oid_to_hex(&head->object.oid),
oid_to_hex(&merge->object.oid));
return -1;
}
if (unmerged_cache()) {
struct string_list *entries, *re_head, *re_merge;
int i;
string_list_clear(&o->current_file_set, 1);
string_list_clear(&o->current_directory_set, 1);
get_files_dirs(o, head);
get_files_dirs(o, merge);
entries = get_unmerged();
record_df_conflict_files(o, entries);
re_head = get_renames(o, head, common, head, merge, entries);
re_merge = get_renames(o, merge, common, head, merge, entries);
clean = process_renames(o, re_head, re_merge);
if (clean < 0)
return clean;
for (i = entries->nr-1; 0 <= i; i--) {
const char *path = entries->items[i].string;
struct stage_data *e = entries->items[i].util;
if (!e->processed) {
int ret = process_entry(o, path, e);
if (!ret)
clean = 0;
else if (ret < 0)
return ret;
}
}
for (i = 0; i < entries->nr; i++) {
struct stage_data *e = entries->items[i].util;
if (!e->processed)
die("BUG: unprocessed path??? %s",
entries->items[i].string);
}
string_list_clear(re_merge, 0);
string_list_clear(re_head, 0);
string_list_clear(entries, 1);
free(re_merge);
free(re_head);
free(entries);
}
else
clean = 1;
if (o->call_depth && !(*result = write_tree_from_memory(o)))
return -1;
return clean;
}
static struct commit_list *reverse_commit_list(struct commit_list *list)
{
struct commit_list *next = NULL, *current, *backup;
for (current = list; current; current = backup) {
backup = current->next;
current->next = next;
next = current;
}
return next;
}
/*
* Merge the commits h1 and h2, return the resulting virtual
* commit object and a flag indicating the cleanness of the merge.
*/
int merge_recursive(struct merge_options *o,
struct commit *h1,
struct commit *h2,
struct commit_list *ca,
struct commit **result)
{
struct commit_list *iter;
struct commit *merged_common_ancestors;
struct tree *mrtree = mrtree;
int clean;
if (show(o, 4)) {
output(o, 4, _("Merging:"));
output_commit_title(o, h1);
output_commit_title(o, h2);
}
if (!ca) {
ca = get_merge_bases(h1, h2);
ca = reverse_commit_list(ca);
}
if (show(o, 5)) {
unsigned cnt = commit_list_count(ca);
output(o, 5, Q_("found %u common ancestor:",
"found %u common ancestors:", cnt), cnt);
for (iter = ca; iter; iter = iter->next)
output_commit_title(o, iter->item);
}
merged_common_ancestors = pop_commit(&ca);
if (merged_common_ancestors == NULL) {
/* if there is no common ancestor, use an empty tree */
struct tree *tree;
tree = lookup_tree(EMPTY_TREE_SHA1_BIN);
merged_common_ancestors = make_virtual_commit(tree, "ancestor");
}
for (iter = ca; iter; iter = iter->next) {
const char *saved_b1, *saved_b2;
o->call_depth++;
/*
* When the merge fails, the result contains files
* with conflict markers. The cleanness flag is
* ignored (unless indicating an error), it was never
* actually used, as result of merge_trees has always
* overwritten it: the committed "conflicts" were
* already resolved.
*/
discard_cache();
saved_b1 = o->branch1;
saved_b2 = o->branch2;
o->branch1 = "Temporary merge branch 1";
o->branch2 = "Temporary merge branch 2";
if (merge_recursive(o, merged_common_ancestors, iter->item,
NULL, &merged_common_ancestors) < 0)
return -1;
o->branch1 = saved_b1;
o->branch2 = saved_b2;
o->call_depth--;
if (!merged_common_ancestors)
return err(o, _("merge returned no commit"));
}
discard_cache();
if (!o->call_depth)
read_cache();
o->ancestor = "merged common ancestors";
clean = merge_trees(o, h1->tree, h2->tree, merged_common_ancestors->tree,
&mrtree);
if (clean < 0) {
flush_output(o);
return clean;
}
if (o->call_depth) {
*result = make_virtual_commit(mrtree, "merged tree");
commit_list_insert(h1, &(*result)->parents);
commit_list_insert(h2, &(*result)->parents->next);
}
flush_output(o);
if (!o->call_depth && o->buffer_output < 2)
strbuf_release(&o->obuf);
if (show(o, 2))
diff_warn_rename_limit("merge.renamelimit",
o->needed_rename_limit, 0);
return clean;
}
static struct commit *get_ref(const struct object_id *oid, const char *name)
{
struct object *object;
object = deref_tag(parse_object(oid->hash), name, strlen(name));
if (!object)
return NULL;
if (object->type == OBJ_TREE)
return make_virtual_commit((struct tree*)object, name);
if (object->type != OBJ_COMMIT)
return NULL;
if (parse_commit((struct commit *)object))
return NULL;
return (struct commit *)object;
}
int merge_recursive_generic(struct merge_options *o,
const struct object_id *head,
const struct object_id *merge,
int num_base_list,
const struct object_id **base_list,
struct commit **result)
{
int clean;
struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
struct commit *head_commit = get_ref(head, o->branch1);
struct commit *next_commit = get_ref(merge, o->branch2);
struct commit_list *ca = NULL;
if (base_list) {
int i;
for (i = 0; i < num_base_list; ++i) {
struct commit *base;
if (!(base = get_ref(base_list[i], oid_to_hex(base_list[i]))))
return err(o, _("Could not parse object '%s'"),
oid_to_hex(base_list[i]));
commit_list_insert(base, &ca);
}
}
hold_locked_index(lock, LOCK_DIE_ON_ERROR);
clean = merge_recursive(o, head_commit, next_commit, ca,
result);
if (clean < 0)
return clean;
if (active_cache_changed &&
write_locked_index(&the_index, lock, COMMIT_LOCK))
return err(o, _("Unable to write index."));
return clean ? 0 : 1;
}
static void merge_recursive_config(struct merge_options *o)
{
git_config_get_int("merge.verbosity", &o->verbosity);
git_config_get_int("diff.renamelimit", &o->diff_rename_limit);
git_config_get_int("merge.renamelimit", &o->merge_rename_limit);
git_config(git_xmerge_config, NULL);
}
void init_merge_options(struct merge_options *o)
{
memset(o, 0, sizeof(struct merge_options));
o->verbosity = 2;
o->buffer_output = 1;
o->diff_rename_limit = -1;
o->merge_rename_limit = -1;
o->renormalize = 0;
o->detect_rename = 1;
merge_recursive_config(o);
if (getenv("GIT_MERGE_VERBOSITY"))
o->verbosity =
strtol(getenv("GIT_MERGE_VERBOSITY"), NULL, 10);
if (o->verbosity >= 5)
o->buffer_output = 0;
strbuf_init(&o->obuf, 0);
string_list_init(&o->current_file_set, 1);
string_list_init(&o->current_directory_set, 1);
string_list_init(&o->df_conflict_file_set, 1);
}
int parse_merge_opt(struct merge_options *o, const char *s)
{
const char *arg;
if (!s || !*s)
return -1;
if (!strcmp(s, "ours"))
o->recursive_variant = MERGE_RECURSIVE_OURS;
else if (!strcmp(s, "theirs"))
o->recursive_variant = MERGE_RECURSIVE_THEIRS;
else if (!strcmp(s, "subtree"))
o->subtree_shift = "";
else if (skip_prefix(s, "subtree=", &arg))
o->subtree_shift = arg;
else if (!strcmp(s, "patience"))
o->xdl_opts = DIFF_WITH_ALG(o, PATIENCE_DIFF);
else if (!strcmp(s, "histogram"))
o->xdl_opts = DIFF_WITH_ALG(o, HISTOGRAM_DIFF);
else if (skip_prefix(s, "diff-algorithm=", &arg)) {
long value = parse_algorithm_value(arg);
if (value < 0)
return -1;
/* clear out previous settings */
DIFF_XDL_CLR(o, NEED_MINIMAL);
o->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
o->xdl_opts |= value;
}
else if (!strcmp(s, "ignore-space-change"))
o->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
else if (!strcmp(s, "ignore-all-space"))
o->xdl_opts |= XDF_IGNORE_WHITESPACE;
else if (!strcmp(s, "ignore-space-at-eol"))
o->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
else if (!strcmp(s, "renormalize"))
o->renormalize = 1;
else if (!strcmp(s, "no-renormalize"))
o->renormalize = 0;
else if (!strcmp(s, "no-renames"))
o->detect_rename = 0;
else if (!strcmp(s, "find-renames")) {
o->detect_rename = 1;
o->rename_score = 0;
}
else if (skip_prefix(s, "find-renames=", &arg) ||
skip_prefix(s, "rename-threshold=", &arg)) {
if ((o->rename_score = parse_rename_score(&arg)) == -1 || *arg != 0)
return -1;
o->detect_rename = 1;
}
else
return -1;
return 0;
}