merge-recursive: handle return values indicating errors
We are about to libify the recursive merge machinery, where we only die() in case of a bug or memory contention. To that end, we must heed negative return values as indicating errors. This requires our functions to be careful to pass through error conditions in call chains, and for quite a few functions this means that they have to return values to begin with. The next step will be to convert the places where we currently die() to return negative values (read: -1) instead. Note that we ignore errors reported by make_room_for_path(), consistent with the previous behavior (update_file_flags() used the return value of make_room_for_path() only to indicate an early return, but not a fatal error): if the error is really a fatal error, we will notice later; If not, it was not that serious a problem to begin with. (Witnesses in favor of this reasoning are t4151-am-abort and t7610-mergetool, which would start failing if we stopped on errors reported by make_room_for_path()). Also note: while this patch makes the code slightly less readable in update_file_flags() (we introduce a new "goto free_buf;" instead of an explicit "free(buf); return;"), it is a preparatory change for the next patch where we will convert all of the die() calls in the same function to go through the free_buf return path instead. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
parent
fbc87eb544
commit
75456f96d4
@ -742,12 +742,12 @@ static int make_room_for_path(struct merge_options *o, const char *path)
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return error(msg, path, _(": perhaps a D/F conflict?"));
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}
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static void update_file_flags(struct merge_options *o,
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const struct object_id *oid,
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unsigned mode,
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const char *path,
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int update_cache,
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int update_wd)
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static int update_file_flags(struct merge_options *o,
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const struct object_id *oid,
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unsigned mode,
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const char *path,
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int update_cache,
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int update_wd)
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{
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if (o->call_depth)
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update_wd = 0;
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@ -783,8 +783,7 @@ static void update_file_flags(struct merge_options *o,
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if (make_room_for_path(o, path) < 0) {
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update_wd = 0;
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free(buf);
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goto update_index;
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goto free_buf;
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}
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if (S_ISREG(mode) || (!has_symlinks && S_ISLNK(mode))) {
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int fd;
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@ -807,20 +806,22 @@ static void update_file_flags(struct merge_options *o,
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} else
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die(_("do not know what to do with %06o %s '%s'"),
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mode, oid_to_hex(oid), path);
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free_buf:
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free(buf);
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}
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update_index:
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if (update_cache)
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add_cacheinfo(mode, oid, path, 0, update_wd, ADD_CACHE_OK_TO_ADD);
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return 0;
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}
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static void update_file(struct merge_options *o,
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int clean,
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const struct object_id *oid,
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unsigned mode,
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const char *path)
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static int update_file(struct merge_options *o,
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int clean,
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const struct object_id *oid,
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unsigned mode,
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const char *path)
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{
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update_file_flags(o, oid, mode, path, o->call_depth || clean, !o->call_depth);
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return update_file_flags(o, oid, mode, path, o->call_depth || clean, !o->call_depth);
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}
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/* Low level file merging, update and removal */
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@ -1019,7 +1020,7 @@ static int merge_file_one(struct merge_options *o,
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return merge_file_1(o, &one, &a, &b, branch1, branch2, mfi);
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}
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static void handle_change_delete(struct merge_options *o,
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static int handle_change_delete(struct merge_options *o,
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const char *path,
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const struct object_id *o_oid, int o_mode,
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const struct object_id *a_oid, int a_mode,
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@ -1027,6 +1028,7 @@ static void handle_change_delete(struct merge_options *o,
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const char *change, const char *change_past)
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{
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char *renamed = NULL;
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int ret = 0;
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if (dir_in_way(path, !o->call_depth)) {
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renamed = unique_path(o, path, a_oid ? o->branch1 : o->branch2);
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}
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@ -1037,21 +1039,23 @@ static void handle_change_delete(struct merge_options *o,
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* correct; since there is no true "middle point" between
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* them, simply reuse the base version for virtual merge base.
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*/
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remove_file_from_cache(path);
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update_file(o, 0, o_oid, o_mode, renamed ? renamed : path);
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ret = remove_file_from_cache(path);
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if (!ret)
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ret = update_file(o, 0, o_oid, o_mode,
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renamed ? renamed : path);
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} else if (!a_oid) {
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if (!renamed) {
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output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
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"and %s in %s. Version %s of %s left in tree."),
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change, path, o->branch1, change_past,
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o->branch2, o->branch2, path);
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update_file(o, 0, b_oid, b_mode, path);
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ret = update_file(o, 0, b_oid, b_mode, path);
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} else {
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output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
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"and %s in %s. Version %s of %s left in tree at %s."),
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change, path, o->branch1, change_past,
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o->branch2, o->branch2, path, renamed);
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update_file(o, 0, b_oid, b_mode, renamed);
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ret = update_file(o, 0, b_oid, b_mode, renamed);
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}
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} else {
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if (!renamed) {
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@ -1064,7 +1068,7 @@ static void handle_change_delete(struct merge_options *o,
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"and %s in %s. Version %s of %s left in tree at %s."),
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change, path, o->branch2, change_past,
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o->branch1, o->branch1, path, renamed);
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update_file(o, 0, a_oid, a_mode, renamed);
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ret = update_file(o, 0, a_oid, a_mode, renamed);
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}
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/*
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* No need to call update_file() on path when !renamed, since
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@ -1074,9 +1078,11 @@ static void handle_change_delete(struct merge_options *o,
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*/
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}
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free(renamed);
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return ret;
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}
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static void conflict_rename_delete(struct merge_options *o,
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static int conflict_rename_delete(struct merge_options *o,
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struct diff_filepair *pair,
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const char *rename_branch,
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const char *other_branch)
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@ -1096,21 +1102,20 @@ static void conflict_rename_delete(struct merge_options *o,
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b_mode = dest->mode;
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}
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handle_change_delete(o,
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o->call_depth ? orig->path : dest->path,
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&orig->oid, orig->mode,
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a_oid, a_mode,
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b_oid, b_mode,
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_("rename"), _("renamed"));
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if (o->call_depth) {
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remove_file_from_cache(dest->path);
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} else {
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update_stages(dest->path, NULL,
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rename_branch == o->branch1 ? dest : NULL,
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rename_branch == o->branch1 ? NULL : dest);
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}
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if (handle_change_delete(o,
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o->call_depth ? orig->path : dest->path,
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&orig->oid, orig->mode,
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a_oid, a_mode,
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b_oid, b_mode,
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_("rename"), _("renamed")))
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return -1;
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if (o->call_depth)
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return remove_file_from_cache(dest->path);
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else
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return update_stages(dest->path, NULL,
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rename_branch == o->branch1 ? dest : NULL,
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rename_branch == o->branch1 ? NULL : dest);
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}
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static struct diff_filespec *filespec_from_entry(struct diff_filespec *target,
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@ -1126,7 +1131,7 @@ static struct diff_filespec *filespec_from_entry(struct diff_filespec *target,
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return target;
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}
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static void handle_file(struct merge_options *o,
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static int handle_file(struct merge_options *o,
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struct diff_filespec *rename,
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int stage,
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struct rename_conflict_info *ci)
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@ -1136,6 +1141,7 @@ static void handle_file(struct merge_options *o,
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const char *cur_branch, *other_branch;
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struct diff_filespec other;
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struct diff_filespec *add;
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int ret;
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if (stage == 2) {
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dst_entry = ci->dst_entry1;
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@ -1150,7 +1156,8 @@ static void handle_file(struct merge_options *o,
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add = filespec_from_entry(&other, dst_entry, stage ^ 1);
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if (add) {
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char *add_name = unique_path(o, rename->path, other_branch);
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update_file(o, 0, &add->oid, add->mode, add_name);
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if (update_file(o, 0, &add->oid, add->mode, add_name))
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return -1;
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remove_file(o, 0, rename->path, 0);
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dst_name = unique_path(o, rename->path, cur_branch);
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@ -1161,17 +1168,20 @@ static void handle_file(struct merge_options *o,
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rename->path, other_branch, dst_name);
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}
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}
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update_file(o, 0, &rename->oid, rename->mode, dst_name);
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if (stage == 2)
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update_stages(rename->path, NULL, rename, add);
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if ((ret = update_file(o, 0, &rename->oid, rename->mode, dst_name)))
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; /* fall through, do allow dst_name to be released */
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else if (stage == 2)
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ret = update_stages(rename->path, NULL, rename, add);
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else
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update_stages(rename->path, NULL, add, rename);
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ret = update_stages(rename->path, NULL, add, rename);
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if (dst_name != rename->path)
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free(dst_name);
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return ret;
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}
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static void conflict_rename_rename_1to2(struct merge_options *o,
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static int conflict_rename_rename_1to2(struct merge_options *o,
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struct rename_conflict_info *ci)
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{
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/* One file was renamed in both branches, but to different names. */
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@ -1194,14 +1204,16 @@ static void conflict_rename_rename_1to2(struct merge_options *o,
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&a->oid, a->mode,
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&b->oid, b->mode,
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ci->branch1, ci->branch2, &mfi))
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return;
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return -1;
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/*
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* FIXME: For rename/add-source conflicts (if we could detect
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* such), this is wrong. We should instead find a unique
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* pathname and then either rename the add-source file to that
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* unique path, or use that unique path instead of src here.
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*/
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update_file(o, 0, &mfi.oid, mfi.mode, one->path);
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if (update_file(o, 0, &mfi.oid, mfi.mode, one->path))
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return -1;
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/*
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* Above, we put the merged content at the merge-base's
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@ -1212,22 +1224,26 @@ static void conflict_rename_rename_1to2(struct merge_options *o,
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* resolving the conflict at that path in its favor.
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*/
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add = filespec_from_entry(&other, ci->dst_entry1, 2 ^ 1);
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if (add)
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update_file(o, 0, &add->oid, add->mode, a->path);
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if (add) {
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if (update_file(o, 0, &add->oid, add->mode, a->path))
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return -1;
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}
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else
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remove_file_from_cache(a->path);
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add = filespec_from_entry(&other, ci->dst_entry2, 3 ^ 1);
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if (add)
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update_file(o, 0, &add->oid, add->mode, b->path);
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if (add) {
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if (update_file(o, 0, &add->oid, add->mode, b->path))
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return -1;
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}
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else
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remove_file_from_cache(b->path);
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} else {
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handle_file(o, a, 2, ci);
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handle_file(o, b, 3, ci);
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}
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} else if (handle_file(o, a, 2, ci) || handle_file(o, b, 3, ci))
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return -1;
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return 0;
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}
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static void conflict_rename_rename_2to1(struct merge_options *o,
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static int conflict_rename_rename_2to1(struct merge_options *o,
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struct rename_conflict_info *ci)
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{
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/* Two files, a & b, were renamed to the same thing, c. */
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@ -1238,6 +1254,7 @@ static void conflict_rename_rename_2to1(struct merge_options *o,
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char *path = c1->path; /* == c2->path */
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struct merge_file_info mfi_c1;
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struct merge_file_info mfi_c2;
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int ret;
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output(o, 1, _("CONFLICT (rename/rename): "
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"Rename %s->%s in %s. "
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@ -1254,7 +1271,7 @@ static void conflict_rename_rename_2to1(struct merge_options *o,
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merge_file_special_markers(o, b, &ci->ren2_other, c2,
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o->branch1, ci->ren2_other.path,
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o->branch2, c2->path, &mfi_c2))
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return;
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return -1;
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if (o->call_depth) {
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/*
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@ -1265,19 +1282,25 @@ static void conflict_rename_rename_2to1(struct merge_options *o,
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* again later for the non-recursive merge.
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*/
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remove_file(o, 0, path, 0);
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update_file(o, 0, &mfi_c1.oid, mfi_c1.mode, a->path);
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update_file(o, 0, &mfi_c2.oid, mfi_c2.mode, b->path);
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ret = update_file(o, 0, &mfi_c1.oid, mfi_c1.mode, a->path);
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if (!ret)
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ret = update_file(o, 0, &mfi_c2.oid, mfi_c2.mode,
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b->path);
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} else {
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char *new_path1 = unique_path(o, path, ci->branch1);
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char *new_path2 = unique_path(o, path, ci->branch2);
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output(o, 1, _("Renaming %s to %s and %s to %s instead"),
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a->path, new_path1, b->path, new_path2);
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remove_file(o, 0, path, 0);
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update_file(o, 0, &mfi_c1.oid, mfi_c1.mode, new_path1);
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update_file(o, 0, &mfi_c2.oid, mfi_c2.mode, new_path2);
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ret = update_file(o, 0, &mfi_c1.oid, mfi_c1.mode, new_path1);
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if (!ret)
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ret = update_file(o, 0, &mfi_c2.oid, mfi_c2.mode,
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new_path2);
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free(new_path2);
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free(new_path1);
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}
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return ret;
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}
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static int process_renames(struct merge_options *o,
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@ -1462,12 +1485,13 @@ static int process_renames(struct merge_options *o,
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* update_file_flags() instead of
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* update_file().
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*/
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update_file_flags(o,
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&ren1->pair->two->oid,
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ren1->pair->two->mode,
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ren1_dst,
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1, /* update_cache */
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0 /* update_wd */);
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if (update_file_flags(o,
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&ren1->pair->two->oid,
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ren1->pair->two->mode,
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ren1_dst,
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1, /* update_cache */
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0 /* update_wd */))
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clean_merge = -1;
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} else if (!oid_eq(&dst_other.oid, &null_oid)) {
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clean_merge = 0;
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try_merge = 1;
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@ -1482,22 +1506,28 @@ static int process_renames(struct merge_options *o,
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ren1->pair->two->mode,
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&dst_other.oid,
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dst_other.mode,
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branch1, branch2, &mfi))
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return -1;
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branch1, branch2, &mfi)) {
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clean_merge = -1;
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goto cleanup_and_return;
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}
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output(o, 1, _("Adding merged %s"), ren1_dst);
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update_file(o, 0, &mfi.oid,
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mfi.mode, ren1_dst);
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if (update_file(o, 0, &mfi.oid,
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mfi.mode, ren1_dst))
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clean_merge = -1;
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try_merge = 0;
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} else {
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char *new_path = unique_path(o, ren1_dst, branch2);
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output(o, 1, _("Adding as %s instead"), new_path);
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update_file(o, 0, &dst_other.oid,
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dst_other.mode, new_path);
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if (update_file(o, 0, &dst_other.oid,
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dst_other.mode, new_path))
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clean_merge = -1;
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free(new_path);
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}
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} else
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try_merge = 1;
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if (clean_merge < 0)
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goto cleanup_and_return;
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if (try_merge) {
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struct diff_filespec *one, *a, *b;
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src_other.path = (char *)ren1_src;
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@ -1524,6 +1554,7 @@ static int process_renames(struct merge_options *o,
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}
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}
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}
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cleanup_and_return:
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string_list_clear(&a_by_dst, 0);
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string_list_clear(&b_by_dst, 0);
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@ -1586,18 +1617,18 @@ error_return:
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return ret;
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}
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static void handle_modify_delete(struct merge_options *o,
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static int handle_modify_delete(struct merge_options *o,
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const char *path,
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struct object_id *o_oid, int o_mode,
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struct object_id *a_oid, int a_mode,
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struct object_id *b_oid, int b_mode)
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{
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handle_change_delete(o,
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path,
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o_oid, o_mode,
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a_oid, a_mode,
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b_oid, b_mode,
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_("modify"), _("modified"));
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return handle_change_delete(o,
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path,
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o_oid, o_mode,
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a_oid, a_mode,
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b_oid, b_mode,
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_("modify"), _("modified"));
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}
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static int merge_content(struct merge_options *o,
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@ -1671,7 +1702,8 @@ static int merge_content(struct merge_options *o,
|
||||
output(o, 1, _("CONFLICT (%s): Merge conflict in %s"),
|
||||
reason, path);
|
||||
if (rename_conflict_info && !df_conflict_remains)
|
||||
update_stages(path, &one, &a, &b);
|
||||
if (update_stages(path, &one, &a, &b))
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (df_conflict_remains) {
|
||||
@ -1679,30 +1711,33 @@ static int merge_content(struct merge_options *o,
|
||||
if (o->call_depth) {
|
||||
remove_file_from_cache(path);
|
||||
} else {
|
||||
if (!mfi.clean)
|
||||
update_stages(path, &one, &a, &b);
|
||||
else {
|
||||
if (!mfi.clean) {
|
||||
if (update_stages(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;
|
||||
|
||||
update_stages(path, NULL,
|
||||
file_from_stage2 ? &merged : NULL,
|
||||
file_from_stage2 ? NULL : &merged);
|
||||
if (update_stages(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);
|
||||
update_file(o, 0, &mfi.oid, mfi.mode, 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 {
|
||||
update_file(o, mfi.clean, &mfi.oid, mfi.mode, path);
|
||||
}
|
||||
} else if (update_file(o, mfi.clean, &mfi.oid, mfi.mode, path))
|
||||
return -1;
|
||||
return mfi.clean;
|
||||
|
||||
}
|
||||
|
||||
/* Per entry merge function */
|
||||
@ -1730,17 +1765,21 @@ static int process_entry(struct merge_options *o,
|
||||
break;
|
||||
case RENAME_DELETE:
|
||||
clean_merge = 0;
|
||||
conflict_rename_delete(o, conflict_info->pair1,
|
||||
conflict_info->branch1,
|
||||
conflict_info->branch2);
|
||||
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;
|
||||
conflict_rename_rename_1to2(o, conflict_info);
|
||||
if (conflict_rename_rename_1to2(o, conflict_info))
|
||||
clean_merge = -1;
|
||||
break;
|
||||
case RENAME_TWO_FILES_TO_ONE:
|
||||
clean_merge = 0;
|
||||
conflict_rename_rename_2to1(o, conflict_info);
|
||||
if (conflict_rename_rename_2to1(o, conflict_info))
|
||||
clean_merge = -1;
|
||||
break;
|
||||
default:
|
||||
entry->processed = 0;
|
||||
@ -1760,8 +1799,9 @@ static int process_entry(struct merge_options *o,
|
||||
} else {
|
||||
/* Modify/delete; deleted side may have put a directory in the way */
|
||||
clean_merge = 0;
|
||||
handle_modify_delete(o, path, o_oid, o_mode,
|
||||
a_oid, a_mode, b_oid, b_mode);
|
||||
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)) {
|
||||
@ -1793,14 +1833,16 @@ static int process_entry(struct merge_options *o,
|
||||
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);
|
||||
update_file(o, 0, oid, mode, new_path);
|
||||
if (o->call_depth)
|
||||
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 */
|
||||
update_file_flags(o, oid, mode, path, 1, !a_oid);
|
||||
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 */
|
||||
@ -1863,12 +1905,18 @@ int merge_trees(struct merge_options *o,
|
||||
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
|
||||
&& !process_entry(o, path, e))
|
||||
clean = 0;
|
||||
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;
|
||||
|
Loading…
Reference in New Issue
Block a user