2 * "Ostensibly Recursive's Twin" merge strategy, or "ort" for short. Meant
3 * as a drop-in replacement for the "recursive" merge strategy, allowing one
6 * git merge [-s recursive]
12 * Note: git's parser allows the space between '-s' and its argument to be
13 * missing. (Should I have backronymed "ham", "alsa", "kip", "nap, "alvo",
14 * "cale", "peedy", or "ins" instead of "ort"?)
18 #include "merge-ort.h"
21 #include "cache-tree.h"
22 #include "commit-reach.h"
26 #include "object-store.h"
29 #include "unpack-trees.h"
30 #include "xdiff-interface.h"
33 * We have many arrays of size 3. Whenever we have such an array, the
34 * indices refer to one of the sides of the three-way merge. This is so
35 * pervasive that the constants 0, 1, and 2 are used in many places in the
36 * code (especially in arithmetic operations to find the other side's index
37 * or to compute a relevant mask), but sometimes these enum names are used
38 * to aid code clarity.
40 * See also 'filemask' and 'dirmask' in struct conflict_info; the "ith side"
41 * referred to there is one of these three sides.
49 struct merge_options_internal
{
51 * paths: primary data structure in all of merge ort.
54 * * are full relative paths from the toplevel of the repository
55 * (e.g. "drivers/firmware/raspberrypi.c").
56 * * store all relevant paths in the repo, both directories and
57 * files (e.g. drivers, drivers/firmware would also be included)
58 * * these keys serve to intern all the path strings, which allows
59 * us to do pointer comparison on directory names instead of
60 * strcmp; we just have to be careful to use the interned strings.
61 * (Technically paths_to_free may track some strings that were
62 * removed from froms paths.)
64 * The values of paths:
65 * * either a pointer to a merged_info, or a conflict_info struct
66 * * merged_info contains all relevant information for a
67 * non-conflicted entry.
68 * * conflict_info contains a merged_info, plus any additional
69 * information about a conflict such as the higher orders stages
70 * involved and the names of the paths those came from (handy
71 * once renames get involved).
72 * * a path may start "conflicted" (i.e. point to a conflict_info)
73 * and then a later step (e.g. three-way content merge) determines
74 * it can be cleanly merged, at which point it'll be marked clean
75 * and the algorithm will ignore any data outside the contained
76 * merged_info for that entry
77 * * If an entry remains conflicted, the merged_info portion of a
78 * conflict_info will later be filled with whatever version of
79 * the file should be placed in the working directory (e.g. an
80 * as-merged-as-possible variation that contains conflict markers).
85 * conflicted: a subset of keys->values from "paths"
87 * conflicted is basically an optimization between process_entries()
88 * and record_conflicted_index_entries(); the latter could loop over
89 * ALL the entries in paths AGAIN and look for the ones that are
90 * still conflicted, but since process_entries() has to loop over
91 * all of them, it saves the ones it couldn't resolve in this strmap
92 * so that record_conflicted_index_entries() can iterate just the
95 struct strmap conflicted
;
98 * paths_to_free: additional list of strings to free
100 * If keys are removed from "paths", they are added to paths_to_free
101 * to ensure they are later freed. We avoid free'ing immediately since
102 * other places (e.g. conflict_info.pathnames[]) may still be
103 * referencing these paths.
105 struct string_list paths_to_free
;
108 * output: special messages and conflict notices for various paths
110 * This is a map of pathnames (a subset of the keys in "paths" above)
111 * to strbufs. It gathers various warning/conflict/notice messages
112 * for later processing.
114 struct strmap output
;
117 * current_dir_name: temporary var used in collect_merge_info_callback()
119 * Used to set merged_info.directory_name; see documentation for that
120 * variable and the requirements placed on that field.
122 const char *current_dir_name
;
124 /* call_depth: recursion level counter for merging merge bases */
128 struct version_info
{
129 struct object_id oid
;
134 /* if is_null, ignore result. otherwise result has oid & mode */
135 struct version_info result
;
139 * clean: whether the path in question is cleanly merged.
141 * see conflict_info.merged for more details.
146 * basename_offset: offset of basename of path.
148 * perf optimization to avoid recomputing offset of final '/'
149 * character in pathname (0 if no '/' in pathname).
151 size_t basename_offset
;
154 * directory_name: containing directory name.
156 * Note that we assume directory_name is constructed such that
157 * strcmp(dir1_name, dir2_name) == 0 iff dir1_name == dir2_name,
158 * i.e. string equality is equivalent to pointer equality. For this
159 * to hold, we have to be careful setting directory_name.
161 const char *directory_name
;
164 struct conflict_info
{
166 * merged: the version of the path that will be written to working tree
168 * WARNING: It is critical to check merged.clean and ensure it is 0
169 * before reading any conflict_info fields outside of merged.
170 * Allocated merge_info structs will always have clean set to 1.
171 * Allocated conflict_info structs will have merged.clean set to 0
172 * initially. The merged.clean field is how we know if it is safe
173 * to access other parts of conflict_info besides merged; if a
174 * conflict_info's merged.clean is changed to 1, the rest of the
175 * algorithm is not allowed to look at anything outside of the
176 * merged member anymore.
178 struct merged_info merged
;
180 /* oids & modes from each of the three trees for this path */
181 struct version_info stages
[3];
183 /* pathnames for each stage; may differ due to rename detection */
184 const char *pathnames
[3];
186 /* Whether this path is/was involved in a directory/file conflict */
187 unsigned df_conflict
:1;
190 * Whether this path is/was involved in a non-content conflict other
191 * than a directory/file conflict (e.g. rename/rename, rename/delete,
192 * file location based on possible directory rename).
194 unsigned path_conflict
:1;
197 * For filemask and dirmask, the ith bit corresponds to whether the
198 * ith entry is a file (filemask) or a directory (dirmask). Thus,
199 * filemask & dirmask is always zero, and filemask | dirmask is at
200 * most 7 but can be less when a path does not appear as either a
201 * file or a directory on at least one side of history.
203 * Note that these masks are related to enum merge_side, as the ith
204 * entry corresponds to side i.
206 * These values come from a traverse_trees() call; more info may be
207 * found looking at tree-walk.h's struct traverse_info,
208 * particularly the documentation above the "fn" member (note that
209 * filemask = mask & ~dirmask from that documentation).
215 * Optimization to track which stages match, to avoid the need to
216 * recompute it in multiple steps. Either 0 or at least 2 bits are
217 * set; if at least 2 bits are set, their corresponding stages match.
219 unsigned match_mask
:3;
222 /*** Function Grouping: various utility functions ***/
225 * For the next three macros, see warning for conflict_info.merged.
227 * In each of the below, mi is a struct merged_info*, and ci was defined
228 * as a struct conflict_info* (but we need to verify ci isn't actually
229 * pointed at a struct merged_info*).
231 * INITIALIZE_CI: Assign ci to mi but only if it's safe; set to NULL otherwise.
232 * VERIFY_CI: Ensure that something we assigned to a conflict_info* is one.
233 * ASSIGN_AND_VERIFY_CI: Similar to VERIFY_CI but do assignment first.
235 #define INITIALIZE_CI(ci, mi) do { \
236 (ci) = (!(mi) || (mi)->clean) ? NULL : (struct conflict_info *)(mi); \
238 #define VERIFY_CI(ci) assert(ci && !ci->merged.clean);
239 #define ASSIGN_AND_VERIFY_CI(ci, mi) do { \
240 (ci) = (struct conflict_info *)(mi); \
241 assert((ci) && !(mi)->clean); \
244 static void free_strmap_strings(struct strmap
*map
)
246 struct hashmap_iter iter
;
247 struct strmap_entry
*entry
;
249 strmap_for_each_entry(map
, &iter
, entry
) {
250 free((char*)entry
->key
);
254 static void clear_internal_opts(struct merge_options_internal
*opti
,
257 assert(!reinitialize
);
260 * We marked opti->paths with strdup_strings = 0, so that we
261 * wouldn't have to make another copy of the fullpath created by
262 * make_traverse_path from setup_path_info(). But, now that we've
263 * used it and have no other references to these strings, it is time
264 * to deallocate them.
266 free_strmap_strings(&opti
->paths
);
267 strmap_clear(&opti
->paths
, 1);
270 * All keys and values in opti->conflicted are a subset of those in
271 * opti->paths. We don't want to deallocate anything twice, so we
272 * don't free the keys and we pass 0 for free_values.
274 strmap_clear(&opti
->conflicted
, 0);
277 * opti->paths_to_free is similar to opti->paths; we created it with
278 * strdup_strings = 0 to avoid making _another_ copy of the fullpath
279 * but now that we've used it and have no other references to these
280 * strings, it is time to deallocate them. We do so by temporarily
281 * setting strdup_strings to 1.
283 opti
->paths_to_free
.strdup_strings
= 1;
284 string_list_clear(&opti
->paths_to_free
, 0);
285 opti
->paths_to_free
.strdup_strings
= 0;
288 struct hashmap_iter iter
;
289 struct strmap_entry
*e
;
291 /* Release and free each strbuf found in output */
292 strmap_for_each_entry(&opti
->output
, &iter
, e
) {
293 struct strbuf
*sb
= e
->value
;
296 * While strictly speaking we don't need to free(sb)
297 * here because we could pass free_values=1 when
298 * calling strmap_clear() on opti->output, that would
299 * require strmap_clear to do another
300 * strmap_for_each_entry() loop, so we just free it
301 * while we're iterating anyway.
305 strmap_clear(&opti
->output
, 0);
309 static int err(struct merge_options
*opt
, const char *err
, ...)
312 struct strbuf sb
= STRBUF_INIT
;
314 strbuf_addstr(&sb
, "error: ");
315 va_start(params
, err
);
316 strbuf_vaddf(&sb
, err
, params
);
325 __attribute__((format (printf
, 4, 5)))
326 static void path_msg(struct merge_options
*opt
,
328 int omittable_hint
, /* skippable under --remerge-diff */
329 const char *fmt
, ...)
332 struct strbuf
*sb
= strmap_get(&opt
->priv
->output
, path
);
334 sb
= xmalloc(sizeof(*sb
));
336 strmap_put(&opt
->priv
->output
, path
, sb
);
340 strbuf_vaddf(sb
, fmt
, ap
);
343 strbuf_addch(sb
, '\n');
346 /* add a string to a strbuf, but converting "/" to "_" */
347 static void add_flattened_path(struct strbuf
*out
, const char *s
)
350 strbuf_addstr(out
, s
);
351 for (; i
< out
->len
; i
++)
352 if (out
->buf
[i
] == '/')
356 static char *unique_path(struct strmap
*existing_paths
,
360 struct strbuf newpath
= STRBUF_INIT
;
364 strbuf_addf(&newpath
, "%s~", path
);
365 add_flattened_path(&newpath
, branch
);
367 base_len
= newpath
.len
;
368 while (strmap_contains(existing_paths
, newpath
.buf
)) {
369 strbuf_setlen(&newpath
, base_len
);
370 strbuf_addf(&newpath
, "_%d", suffix
++);
373 return strbuf_detach(&newpath
, NULL
);
376 /*** Function Grouping: functions related to collect_merge_info() ***/
378 static void setup_path_info(struct merge_options
*opt
,
379 struct string_list_item
*result
,
380 const char *current_dir_name
,
381 int current_dir_name_len
,
382 char *fullpath
, /* we'll take over ownership */
383 struct name_entry
*names
,
384 struct name_entry
*merged_version
,
385 unsigned is_null
, /* boolean */
386 unsigned df_conflict
, /* boolean */
389 int resolved
/* boolean */)
391 /* result->util is void*, so mi is a convenience typed variable */
392 struct merged_info
*mi
;
394 assert(!is_null
|| resolved
);
395 assert(!df_conflict
|| !resolved
); /* df_conflict implies !resolved */
396 assert(resolved
== (merged_version
!= NULL
));
398 mi
= xcalloc(1, resolved
? sizeof(struct merged_info
) :
399 sizeof(struct conflict_info
));
400 mi
->directory_name
= current_dir_name
;
401 mi
->basename_offset
= current_dir_name_len
;
402 mi
->clean
= !!resolved
;
404 mi
->result
.mode
= merged_version
->mode
;
405 oidcpy(&mi
->result
.oid
, &merged_version
->oid
);
406 mi
->is_null
= !!is_null
;
409 struct conflict_info
*ci
;
411 ASSIGN_AND_VERIFY_CI(ci
, mi
);
412 for (i
= MERGE_BASE
; i
<= MERGE_SIDE2
; i
++) {
413 ci
->pathnames
[i
] = fullpath
;
414 ci
->stages
[i
].mode
= names
[i
].mode
;
415 oidcpy(&ci
->stages
[i
].oid
, &names
[i
].oid
);
417 ci
->filemask
= filemask
;
418 ci
->dirmask
= dirmask
;
419 ci
->df_conflict
= !!df_conflict
;
422 * Assume is_null for now, but if we have entries
423 * under the directory then when it is complete in
424 * write_completed_directory() it'll update this.
425 * Also, for D/F conflicts, we have to handle the
426 * directory first, then clear this bit and process
427 * the file to see how it is handled -- that occurs
428 * near the top of process_entry().
432 strmap_put(&opt
->priv
->paths
, fullpath
, mi
);
433 result
->string
= fullpath
;
437 static int collect_merge_info_callback(int n
,
439 unsigned long dirmask
,
440 struct name_entry
*names
,
441 struct traverse_info
*info
)
445 * common ancestor (mbase) has mask 1, and stored in index 0 of names
446 * head of side 1 (side1) has mask 2, and stored in index 1 of names
447 * head of side 2 (side2) has mask 4, and stored in index 2 of names
449 struct merge_options
*opt
= info
->data
;
450 struct merge_options_internal
*opti
= opt
->priv
;
451 struct string_list_item pi
; /* Path Info */
452 struct conflict_info
*ci
; /* typed alias to pi.util (which is void*) */
453 struct name_entry
*p
;
456 const char *dirname
= opti
->current_dir_name
;
457 unsigned filemask
= mask
& ~dirmask
;
458 unsigned match_mask
= 0; /* will be updated below */
459 unsigned mbase_null
= !(mask
& 1);
460 unsigned side1_null
= !(mask
& 2);
461 unsigned side2_null
= !(mask
& 4);
462 unsigned side1_matches_mbase
= (!side1_null
&& !mbase_null
&&
463 names
[0].mode
== names
[1].mode
&&
464 oideq(&names
[0].oid
, &names
[1].oid
));
465 unsigned side2_matches_mbase
= (!side2_null
&& !mbase_null
&&
466 names
[0].mode
== names
[2].mode
&&
467 oideq(&names
[0].oid
, &names
[2].oid
));
468 unsigned sides_match
= (!side1_null
&& !side2_null
&&
469 names
[1].mode
== names
[2].mode
&&
470 oideq(&names
[1].oid
, &names
[2].oid
));
473 * Note: When a path is a file on one side of history and a directory
474 * in another, we have a directory/file conflict. In such cases, if
475 * the conflict doesn't resolve from renames and deletions, then we
476 * always leave directories where they are and move files out of the
477 * way. Thus, while struct conflict_info has a df_conflict field to
478 * track such conflicts, we ignore that field for any directories at
479 * a path and only pay attention to it for files at the given path.
480 * The fact that we leave directories were they are also means that
481 * we do not need to worry about getting additional df_conflict
482 * information propagated from parent directories down to children
483 * (unlike, say traverse_trees_recursive() in unpack-trees.c, which
484 * sets a newinfo.df_conflicts field specifically to propagate it).
486 unsigned df_conflict
= (filemask
!= 0) && (dirmask
!= 0);
488 /* n = 3 is a fundamental assumption. */
490 BUG("Called collect_merge_info_callback wrong");
493 * A bunch of sanity checks verifying that traverse_trees() calls
494 * us the way I expect. Could just remove these at some point,
495 * though maybe they are helpful to future code readers.
497 assert(mbase_null
== is_null_oid(&names
[0].oid
));
498 assert(side1_null
== is_null_oid(&names
[1].oid
));
499 assert(side2_null
== is_null_oid(&names
[2].oid
));
500 assert(!mbase_null
|| !side1_null
|| !side2_null
);
501 assert(mask
> 0 && mask
< 8);
503 /* Determine match_mask */
504 if (side1_matches_mbase
)
505 match_mask
= (side2_matches_mbase
? 7 : 3);
506 else if (side2_matches_mbase
)
508 else if (sides_match
)
512 * Get the name of the relevant filepath, which we'll pass to
513 * setup_path_info() for tracking.
518 len
= traverse_path_len(info
, p
->pathlen
);
520 /* +1 in both of the following lines to include the NUL byte */
521 fullpath
= xmalloc(len
+ 1);
522 make_traverse_path(fullpath
, len
+ 1, info
, p
->path
, p
->pathlen
);
525 * If mbase, side1, and side2 all match, we can resolve early. Even
526 * if these are trees, there will be no renames or anything
529 if (side1_matches_mbase
&& side2_matches_mbase
) {
530 /* mbase, side1, & side2 all match; use mbase as resolution */
531 setup_path_info(opt
, &pi
, dirname
, info
->pathlen
, fullpath
,
532 names
, names
+0, mbase_null
, 0,
533 filemask
, dirmask
, 1);
538 * Record information about the path so we can resolve later in
541 setup_path_info(opt
, &pi
, dirname
, info
->pathlen
, fullpath
,
542 names
, NULL
, 0, df_conflict
, filemask
, dirmask
, 0);
546 ci
->match_mask
= match_mask
;
548 /* If dirmask, recurse into subdirectories */
550 struct traverse_info newinfo
;
551 struct tree_desc t
[3];
552 void *buf
[3] = {NULL
, NULL
, NULL
};
553 const char *original_dir_name
;
556 ci
->match_mask
&= filemask
;
559 newinfo
.name
= p
->path
;
560 newinfo
.namelen
= p
->pathlen
;
561 newinfo
.pathlen
= st_add3(newinfo
.pathlen
, p
->pathlen
, 1);
563 * If this directory we are about to recurse into cared about
564 * its parent directory (the current directory) having a D/F
565 * conflict, then we'd propagate the masks in this way:
566 * newinfo.df_conflicts |= (mask & ~dirmask);
567 * But we don't worry about propagating D/F conflicts. (See
568 * comment near setting of local df_conflict variable near
569 * the beginning of this function).
572 for (i
= MERGE_BASE
; i
<= MERGE_SIDE2
; i
++) {
573 if (i
== 1 && side1_matches_mbase
)
575 else if (i
== 2 && side2_matches_mbase
)
577 else if (i
== 2 && sides_match
)
580 const struct object_id
*oid
= NULL
;
583 buf
[i
] = fill_tree_descriptor(opt
->repo
,
589 original_dir_name
= opti
->current_dir_name
;
590 opti
->current_dir_name
= pi
.string
;
591 ret
= traverse_trees(NULL
, 3, t
, &newinfo
);
592 opti
->current_dir_name
= original_dir_name
;
594 for (i
= MERGE_BASE
; i
<= MERGE_SIDE2
; i
++)
604 static int collect_merge_info(struct merge_options
*opt
,
605 struct tree
*merge_base
,
610 struct tree_desc t
[3];
611 struct traverse_info info
;
612 const char *toplevel_dir_placeholder
= "";
614 opt
->priv
->current_dir_name
= toplevel_dir_placeholder
;
615 setup_traverse_info(&info
, toplevel_dir_placeholder
);
616 info
.fn
= collect_merge_info_callback
;
618 info
.show_all_errors
= 1;
620 parse_tree(merge_base
);
623 init_tree_desc(t
+ 0, merge_base
->buffer
, merge_base
->size
);
624 init_tree_desc(t
+ 1, side1
->buffer
, side1
->size
);
625 init_tree_desc(t
+ 2, side2
->buffer
, side2
->size
);
627 ret
= traverse_trees(NULL
, 3, t
, &info
);
632 /*** Function Grouping: functions related to threeway content merges ***/
634 static int handle_content_merge(struct merge_options
*opt
,
636 const struct version_info
*o
,
637 const struct version_info
*a
,
638 const struct version_info
*b
,
639 const char *pathnames
[3],
640 const int extra_marker_size
,
641 struct version_info
*result
)
643 die("Not yet implemented");
646 /*** Function Grouping: functions related to detect_and_process_renames(), ***
647 *** which are split into directory and regular rename detection sections. ***/
649 /*** Function Grouping: functions related to directory rename detection ***/
651 /*** Function Grouping: functions related to regular rename detection ***/
653 static int detect_and_process_renames(struct merge_options
*opt
,
654 struct tree
*merge_base
,
661 * Rename detection works by detecting file similarity. Here we use
662 * a really easy-to-implement scheme: files are similar IFF they have
663 * the same filename. Therefore, by this scheme, there are no renames.
665 * TODO: Actually implement a real rename detection scheme.
670 /*** Function Grouping: functions related to process_entries() ***/
672 static int string_list_df_name_compare(const char *one
, const char *two
)
674 int onelen
= strlen(one
);
675 int twolen
= strlen(two
);
677 * Here we only care that entries for D/F conflicts are
678 * adjacent, in particular with the file of the D/F conflict
679 * appearing before files below the corresponding directory.
680 * The order of the rest of the list is irrelevant for us.
682 * To achieve this, we sort with df_name_compare and provide
683 * the mode S_IFDIR so that D/F conflicts will sort correctly.
684 * We use the mode S_IFDIR for everything else for simplicity,
685 * since in other cases any changes in their order due to
686 * sorting cause no problems for us.
688 int cmp
= df_name_compare(one
, onelen
, S_IFDIR
,
689 two
, twolen
, S_IFDIR
);
691 * Now that 'foo' and 'foo/bar' compare equal, we have to make sure
692 * that 'foo' comes before 'foo/bar'.
696 return onelen
- twolen
;
699 struct directory_versions
{
701 * versions: list of (basename -> version_info)
703 * The basenames are in reverse lexicographic order of full pathnames,
704 * as processed in process_entries(). This puts all entries within
705 * a directory together, and covers the directory itself after
706 * everything within it, allowing us to write subtrees before needing
707 * to record information for the tree itself.
709 struct string_list versions
;
712 * offsets: list of (full relative path directories -> integer offsets)
714 * Since versions contains basenames from files in multiple different
715 * directories, we need to know which entries in versions correspond
716 * to which directories. Values of e.g.
720 * Would mean that entries 0-1 of versions are files in the toplevel
721 * directory, entries 2-4 are files under src/, and the remaining
722 * entries starting at index 5 are files under src/moduleA/.
724 struct string_list offsets
;
727 * last_directory: directory that previously processed file found in
729 * last_directory starts NULL, but records the directory in which the
730 * previous file was found within. As soon as
731 * directory(current_file) != last_directory
732 * then we need to start updating accounting in versions & offsets.
733 * Note that last_directory is always the last path in "offsets" (or
734 * NULL if "offsets" is empty) so this exists just for quick access.
736 const char *last_directory
;
738 /* last_directory_len: cached computation of strlen(last_directory) */
739 unsigned last_directory_len
;
742 static int tree_entry_order(const void *a_
, const void *b_
)
744 const struct string_list_item
*a
= a_
;
745 const struct string_list_item
*b
= b_
;
747 const struct merged_info
*ami
= a
->util
;
748 const struct merged_info
*bmi
= b
->util
;
749 return base_name_compare(a
->string
, strlen(a
->string
), ami
->result
.mode
,
750 b
->string
, strlen(b
->string
), bmi
->result
.mode
);
753 static void write_tree(struct object_id
*result_oid
,
754 struct string_list
*versions
,
758 size_t maxlen
= 0, extra
;
759 unsigned int nr
= versions
->nr
- offset
;
760 struct strbuf buf
= STRBUF_INIT
;
761 struct string_list relevant_entries
= STRING_LIST_INIT_NODUP
;
765 * We want to sort the last (versions->nr-offset) entries in versions.
766 * Do so by abusing the string_list API a bit: make another string_list
767 * that contains just those entries and then sort them.
769 * We won't use relevant_entries again and will let it just pop off the
770 * stack, so there won't be allocation worries or anything.
772 relevant_entries
.items
= versions
->items
+ offset
;
773 relevant_entries
.nr
= versions
->nr
- offset
;
774 QSORT(relevant_entries
.items
, relevant_entries
.nr
, tree_entry_order
);
776 /* Pre-allocate some space in buf */
777 extra
= hash_size
+ 8; /* 8: 6 for mode, 1 for space, 1 for NUL char */
778 for (i
= 0; i
< nr
; i
++) {
779 maxlen
+= strlen(versions
->items
[offset
+i
].string
) + extra
;
781 strbuf_grow(&buf
, maxlen
);
783 /* Write each entry out to buf */
784 for (i
= 0; i
< nr
; i
++) {
785 struct merged_info
*mi
= versions
->items
[offset
+i
].util
;
786 struct version_info
*ri
= &mi
->result
;
787 strbuf_addf(&buf
, "%o %s%c",
789 versions
->items
[offset
+i
].string
, '\0');
790 strbuf_add(&buf
, ri
->oid
.hash
, hash_size
);
793 /* Write this object file out, and record in result_oid */
794 write_object_file(buf
.buf
, buf
.len
, tree_type
, result_oid
);
795 strbuf_release(&buf
);
798 static void record_entry_for_tree(struct directory_versions
*dir_metadata
,
800 struct merged_info
*mi
)
802 const char *basename
;
805 /* nothing to record */
808 basename
= path
+ mi
->basename_offset
;
809 assert(strchr(basename
, '/') == NULL
);
810 string_list_append(&dir_metadata
->versions
,
811 basename
)->util
= &mi
->result
;
814 static void write_completed_directory(struct merge_options
*opt
,
815 const char *new_directory_name
,
816 struct directory_versions
*info
)
818 const char *prev_dir
;
819 struct merged_info
*dir_info
= NULL
;
823 * Some explanation of info->versions and info->offsets...
825 * process_entries() iterates over all relevant files AND
826 * directories in reverse lexicographic order, and calls this
827 * function. Thus, an example of the paths that process_entries()
828 * could operate on (along with the directories for those paths
833 * src/moduleB/umm.c src/moduleB
834 * src/moduleB/stuff.h src/moduleB
835 * src/moduleB/baz.c src/moduleB
837 * src/moduleA/foo.c src/moduleA
838 * src/moduleA/bar.c src/moduleA
845 * always contains the unprocessed entries and their
846 * version_info information. For example, after the first five
847 * entries above, info->versions would be:
849 * xtract.c <xtract.c's version_info>
850 * token.txt <token.txt's version_info>
851 * umm.c <src/moduleB/umm.c's version_info>
852 * stuff.h <src/moduleB/stuff.h's version_info>
853 * baz.c <src/moduleB/baz.c's version_info>
855 * Once a subdirectory is completed we remove the entries in
856 * that subdirectory from info->versions, writing it as a tree
857 * (write_tree()). Thus, as soon as we get to src/moduleB,
858 * info->versions would be updated to
860 * xtract.c <xtract.c's version_info>
861 * token.txt <token.txt's version_info>
862 * moduleB <src/moduleB's version_info>
866 * helps us track which entries in info->versions correspond to
867 * which directories. When we are N directories deep (e.g. 4
868 * for src/modA/submod/subdir/), we have up to N+1 unprocessed
869 * directories (+1 because of toplevel dir). Corresponding to
870 * the info->versions example above, after processing five entries
871 * info->offsets will be:
876 * which is used to know that xtract.c & token.txt are from the
877 * toplevel dirctory, while umm.c & stuff.h & baz.c are from the
878 * src/moduleB directory. Again, following the example above,
879 * once we need to process src/moduleB, then info->offsets is
885 * which says that moduleB (and only moduleB so far) is in the
888 * One unique thing to note about info->offsets here is that
889 * "src" was not added to info->offsets until there was a path
890 * (a file OR directory) immediately below src/ that got
893 * Since process_entry() just appends new entries to info->versions,
894 * write_completed_directory() only needs to do work if the next path
895 * is in a directory that is different than the last directory found
900 * If we are working with the same directory as the last entry, there
901 * is no work to do. (See comments above the directory_name member of
902 * struct merged_info for why we can use pointer comparison instead of
905 if (new_directory_name
== info
->last_directory
)
909 * If we are just starting (last_directory is NULL), or last_directory
910 * is a prefix of the current directory, then we can just update
911 * info->offsets to record the offset where we started this directory
912 * and update last_directory to have quick access to it.
914 if (info
->last_directory
== NULL
||
915 !strncmp(new_directory_name
, info
->last_directory
,
916 info
->last_directory_len
)) {
917 uintptr_t offset
= info
->versions
.nr
;
919 info
->last_directory
= new_directory_name
;
920 info
->last_directory_len
= strlen(info
->last_directory
);
922 * Record the offset into info->versions where we will
923 * start recording basenames of paths found within
924 * new_directory_name.
926 string_list_append(&info
->offsets
,
927 info
->last_directory
)->util
= (void*)offset
;
932 * The next entry that will be processed will be within
933 * new_directory_name. Since at this point we know that
934 * new_directory_name is within a different directory than
935 * info->last_directory, we have all entries for info->last_directory
936 * in info->versions and we need to create a tree object for them.
938 dir_info
= strmap_get(&opt
->priv
->paths
, info
->last_directory
);
940 offset
= (uintptr_t)info
->offsets
.items
[info
->offsets
.nr
-1].util
;
941 if (offset
== info
->versions
.nr
) {
943 * Actually, we don't need to create a tree object in this
944 * case. Whenever all files within a directory disappear
945 * during the merge (e.g. unmodified on one side and
946 * deleted on the other, or files were renamed elsewhere),
947 * then we get here and the directory itself needs to be
948 * omitted from its parent tree as well.
950 dir_info
->is_null
= 1;
953 * Write out the tree to the git object directory, and also
954 * record the mode and oid in dir_info->result.
956 dir_info
->is_null
= 0;
957 dir_info
->result
.mode
= S_IFDIR
;
958 write_tree(&dir_info
->result
.oid
, &info
->versions
, offset
,
959 opt
->repo
->hash_algo
->rawsz
);
963 * We've now used several entries from info->versions and one entry
964 * from info->offsets, so we get rid of those values.
967 info
->versions
.nr
= offset
;
970 * Now we've taken care of the completed directory, but we need to
971 * prepare things since future entries will be in
972 * new_directory_name. (In particular, process_entry() will be
973 * appending new entries to info->versions.) So, we need to make
974 * sure new_directory_name is the last entry in info->offsets.
976 prev_dir
= info
->offsets
.nr
== 0 ? NULL
:
977 info
->offsets
.items
[info
->offsets
.nr
-1].string
;
978 if (new_directory_name
!= prev_dir
) {
979 uintptr_t c
= info
->versions
.nr
;
980 string_list_append(&info
->offsets
,
981 new_directory_name
)->util
= (void*)c
;
984 /* And, of course, we need to update last_directory to match. */
985 info
->last_directory
= new_directory_name
;
986 info
->last_directory_len
= strlen(info
->last_directory
);
989 /* Per entry merge function */
990 static void process_entry(struct merge_options
*opt
,
992 struct conflict_info
*ci
,
993 struct directory_versions
*dir_metadata
)
995 int df_file_index
= 0;
998 assert(ci
->filemask
>= 0 && ci
->filemask
<= 7);
999 /* ci->match_mask == 7 was handled in collect_merge_info_callback() */
1000 assert(ci
->match_mask
== 0 || ci
->match_mask
== 3 ||
1001 ci
->match_mask
== 5 || ci
->match_mask
== 6);
1004 record_entry_for_tree(dir_metadata
, path
, &ci
->merged
);
1005 if (ci
->filemask
== 0)
1006 /* nothing else to handle */
1008 assert(ci
->df_conflict
);
1011 if (ci
->df_conflict
&& ci
->merged
.result
.mode
== 0) {
1015 * directory no longer in the way, but we do have a file we
1016 * need to place here so we need to clean away the "directory
1017 * merges to nothing" result.
1019 ci
->df_conflict
= 0;
1020 assert(ci
->filemask
!= 0);
1021 ci
->merged
.clean
= 0;
1022 ci
->merged
.is_null
= 0;
1023 /* and we want to zero out any directory-related entries */
1024 ci
->match_mask
= (ci
->match_mask
& ~ci
->dirmask
);
1026 for (i
= MERGE_BASE
; i
<= MERGE_SIDE2
; i
++) {
1027 if (ci
->filemask
& (1 << i
))
1029 ci
->stages
[i
].mode
= 0;
1030 oidcpy(&ci
->stages
[i
].oid
, &null_oid
);
1032 } else if (ci
->df_conflict
&& ci
->merged
.result
.mode
!= 0) {
1034 * This started out as a D/F conflict, and the entries in
1035 * the competing directory were not removed by the merge as
1036 * evidenced by write_completed_directory() writing a value
1037 * to ci->merged.result.mode.
1039 struct conflict_info
*new_ci
;
1041 const char *old_path
= path
;
1044 assert(ci
->merged
.result
.mode
== S_IFDIR
);
1047 * If filemask is 1, we can just ignore the file as having
1048 * been deleted on both sides. We do not want to overwrite
1049 * ci->merged.result, since it stores the tree for all the
1052 if (ci
->filemask
== 1) {
1058 * This file still exists on at least one side, and we want
1059 * the directory to remain here, so we need to move this
1060 * path to some new location.
1062 new_ci
= xcalloc(1, sizeof(*new_ci
));
1063 /* We don't really want new_ci->merged.result copied, but it'll
1064 * be overwritten below so it doesn't matter. We also don't
1065 * want any directory mode/oid values copied, but we'll zero
1066 * those out immediately. We do want the rest of ci copied.
1068 memcpy(new_ci
, ci
, sizeof(*ci
));
1069 new_ci
->match_mask
= (new_ci
->match_mask
& ~new_ci
->dirmask
);
1070 new_ci
->dirmask
= 0;
1071 for (i
= MERGE_BASE
; i
<= MERGE_SIDE2
; i
++) {
1072 if (new_ci
->filemask
& (1 << i
))
1074 /* zero out any entries related to directories */
1075 new_ci
->stages
[i
].mode
= 0;
1076 oidcpy(&new_ci
->stages
[i
].oid
, &null_oid
);
1080 * Find out which side this file came from; note that we
1081 * cannot just use ci->filemask, because renames could cause
1082 * the filemask to go back to 7. So we use dirmask, then
1083 * pick the opposite side's index.
1085 df_file_index
= (ci
->dirmask
& (1 << 1)) ? 2 : 1;
1086 branch
= (df_file_index
== 1) ? opt
->branch1
: opt
->branch2
;
1087 path
= unique_path(&opt
->priv
->paths
, path
, branch
);
1088 strmap_put(&opt
->priv
->paths
, path
, new_ci
);
1090 path_msg(opt
, path
, 0,
1091 _("CONFLICT (file/directory): directory in the way "
1092 "of %s from %s; moving it to %s instead."),
1093 old_path
, branch
, path
);
1096 * Zero out the filemask for the old ci. At this point, ci
1097 * was just an entry for a directory, so we don't need to
1098 * do anything more with it.
1103 * Now note that we're working on the new entry (path was
1110 * NOTE: Below there is a long switch-like if-elseif-elseif... block
1111 * which the code goes through even for the df_conflict cases
1114 if (ci
->match_mask
) {
1115 ci
->merged
.clean
= 1;
1116 if (ci
->match_mask
== 6) {
1117 /* stages[1] == stages[2] */
1118 ci
->merged
.result
.mode
= ci
->stages
[1].mode
;
1119 oidcpy(&ci
->merged
.result
.oid
, &ci
->stages
[1].oid
);
1121 /* determine the mask of the side that didn't match */
1122 unsigned int othermask
= 7 & ~ci
->match_mask
;
1123 int side
= (othermask
== 4) ? 2 : 1;
1125 ci
->merged
.result
.mode
= ci
->stages
[side
].mode
;
1126 ci
->merged
.is_null
= !ci
->merged
.result
.mode
;
1127 oidcpy(&ci
->merged
.result
.oid
, &ci
->stages
[side
].oid
);
1129 assert(othermask
== 2 || othermask
== 4);
1130 assert(ci
->merged
.is_null
==
1131 (ci
->filemask
== ci
->match_mask
));
1133 } else if (ci
->filemask
>= 6 &&
1134 (S_IFMT
& ci
->stages
[1].mode
) !=
1135 (S_IFMT
& ci
->stages
[2].mode
)) {
1137 * Two different items from (file/submodule/symlink)
1139 die("Not yet implemented.");
1140 } else if (ci
->filemask
>= 6) {
1142 * TODO: Needs a two-way or three-way content merge, but we're
1143 * just being lazy and copying the version from HEAD and
1144 * leaving it as conflicted.
1146 ci
->merged
.clean
= 0;
1147 ci
->merged
.result
.mode
= ci
->stages
[1].mode
;
1148 oidcpy(&ci
->merged
.result
.oid
, &ci
->stages
[1].oid
);
1149 /* When we fix above, we'll call handle_content_merge() */
1150 (void)handle_content_merge
;
1151 } else if (ci
->filemask
== 3 || ci
->filemask
== 5) {
1153 const char *modify_branch
, *delete_branch
;
1154 int side
= (ci
->filemask
== 5) ? 2 : 1;
1155 int index
= opt
->priv
->call_depth
? 0 : side
;
1157 ci
->merged
.result
.mode
= ci
->stages
[index
].mode
;
1158 oidcpy(&ci
->merged
.result
.oid
, &ci
->stages
[index
].oid
);
1159 ci
->merged
.clean
= 0;
1161 modify_branch
= (side
== 1) ? opt
->branch1
: opt
->branch2
;
1162 delete_branch
= (side
== 1) ? opt
->branch2
: opt
->branch1
;
1164 path_msg(opt
, path
, 0,
1165 _("CONFLICT (modify/delete): %s deleted in %s "
1166 "and modified in %s. Version %s of %s left "
1168 path
, delete_branch
, modify_branch
,
1169 modify_branch
, path
);
1170 } else if (ci
->filemask
== 2 || ci
->filemask
== 4) {
1171 /* Added on one side */
1172 int side
= (ci
->filemask
== 4) ? 2 : 1;
1173 ci
->merged
.result
.mode
= ci
->stages
[side
].mode
;
1174 oidcpy(&ci
->merged
.result
.oid
, &ci
->stages
[side
].oid
);
1175 ci
->merged
.clean
= !ci
->df_conflict
;
1176 } else if (ci
->filemask
== 1) {
1177 /* Deleted on both sides */
1178 ci
->merged
.is_null
= 1;
1179 ci
->merged
.result
.mode
= 0;
1180 oidcpy(&ci
->merged
.result
.oid
, &null_oid
);
1181 ci
->merged
.clean
= 1;
1185 * If still conflicted, record it separately. This allows us to later
1186 * iterate over just conflicted entries when updating the index instead
1187 * of iterating over all entries.
1189 if (!ci
->merged
.clean
)
1190 strmap_put(&opt
->priv
->conflicted
, path
, ci
);
1191 record_entry_for_tree(dir_metadata
, path
, &ci
->merged
);
1194 static void process_entries(struct merge_options
*opt
,
1195 struct object_id
*result_oid
)
1197 struct hashmap_iter iter
;
1198 struct strmap_entry
*e
;
1199 struct string_list plist
= STRING_LIST_INIT_NODUP
;
1200 struct string_list_item
*entry
;
1201 struct directory_versions dir_metadata
= { STRING_LIST_INIT_NODUP
,
1202 STRING_LIST_INIT_NODUP
,
1205 if (strmap_empty(&opt
->priv
->paths
)) {
1206 oidcpy(result_oid
, opt
->repo
->hash_algo
->empty_tree
);
1210 /* Hack to pre-allocate plist to the desired size */
1211 ALLOC_GROW(plist
.items
, strmap_get_size(&opt
->priv
->paths
), plist
.alloc
);
1213 /* Put every entry from paths into plist, then sort */
1214 strmap_for_each_entry(&opt
->priv
->paths
, &iter
, e
) {
1215 string_list_append(&plist
, e
->key
)->util
= e
->value
;
1217 plist
.cmp
= string_list_df_name_compare
;
1218 string_list_sort(&plist
);
1221 * Iterate over the items in reverse order, so we can handle paths
1222 * below a directory before needing to handle the directory itself.
1224 * This allows us to write subtrees before we need to write trees,
1225 * and it also enables sane handling of directory/file conflicts
1226 * (because it allows us to know whether the directory is still in
1227 * the way when it is time to process the file at the same path).
1229 for (entry
= &plist
.items
[plist
.nr
-1]; entry
>= plist
.items
; --entry
) {
1230 char *path
= entry
->string
;
1232 * NOTE: mi may actually be a pointer to a conflict_info, but
1233 * we have to check mi->clean first to see if it's safe to
1234 * reassign to such a pointer type.
1236 struct merged_info
*mi
= entry
->util
;
1238 write_completed_directory(opt
, mi
->directory_name
,
1241 record_entry_for_tree(&dir_metadata
, path
, mi
);
1243 struct conflict_info
*ci
= (struct conflict_info
*)mi
;
1244 process_entry(opt
, path
, ci
, &dir_metadata
);
1248 if (dir_metadata
.offsets
.nr
!= 1 ||
1249 (uintptr_t)dir_metadata
.offsets
.items
[0].util
!= 0) {
1250 printf("dir_metadata.offsets.nr = %d (should be 1)\n",
1251 dir_metadata
.offsets
.nr
);
1252 printf("dir_metadata.offsets.items[0].util = %u (should be 0)\n",
1253 (unsigned)(uintptr_t)dir_metadata
.offsets
.items
[0].util
);
1255 BUG("dir_metadata accounting completely off; shouldn't happen");
1257 write_tree(result_oid
, &dir_metadata
.versions
, 0,
1258 opt
->repo
->hash_algo
->rawsz
);
1259 string_list_clear(&plist
, 0);
1260 string_list_clear(&dir_metadata
.versions
, 0);
1261 string_list_clear(&dir_metadata
.offsets
, 0);
1264 /*** Function Grouping: functions related to merge_switch_to_result() ***/
1266 static int checkout(struct merge_options
*opt
,
1270 /* Switch the index/working copy from old to new */
1272 struct tree_desc trees
[2];
1273 struct unpack_trees_options unpack_opts
;
1275 memset(&unpack_opts
, 0, sizeof(unpack_opts
));
1276 unpack_opts
.head_idx
= -1;
1277 unpack_opts
.src_index
= opt
->repo
->index
;
1278 unpack_opts
.dst_index
= opt
->repo
->index
;
1280 setup_unpack_trees_porcelain(&unpack_opts
, "merge");
1283 * NOTE: if this were just "git checkout" code, we would probably
1284 * read or refresh the cache and check for a conflicted index, but
1285 * builtin/merge.c or sequencer.c really needs to read the index
1286 * and check for conflicted entries before starting merging for a
1287 * good user experience (no sense waiting for merges/rebases before
1288 * erroring out), so there's no reason to duplicate that work here.
1291 /* 2-way merge to the new branch */
1292 unpack_opts
.update
= 1;
1293 unpack_opts
.merge
= 1;
1294 unpack_opts
.quiet
= 0; /* FIXME: sequencer might want quiet? */
1295 unpack_opts
.verbose_update
= (opt
->verbosity
> 2);
1296 unpack_opts
.fn
= twoway_merge
;
1297 if (1/* FIXME: opts->overwrite_ignore*/) {
1298 unpack_opts
.dir
= xcalloc(1, sizeof(*unpack_opts
.dir
));
1299 unpack_opts
.dir
->flags
|= DIR_SHOW_IGNORED
;
1300 setup_standard_excludes(unpack_opts
.dir
);
1303 init_tree_desc(&trees
[0], prev
->buffer
, prev
->size
);
1305 init_tree_desc(&trees
[1], next
->buffer
, next
->size
);
1307 ret
= unpack_trees(2, trees
, &unpack_opts
);
1308 clear_unpack_trees_porcelain(&unpack_opts
);
1309 dir_clear(unpack_opts
.dir
);
1310 FREE_AND_NULL(unpack_opts
.dir
);
1314 static int record_conflicted_index_entries(struct merge_options
*opt
,
1315 struct index_state
*index
,
1316 struct strmap
*paths
,
1317 struct strmap
*conflicted
)
1319 struct hashmap_iter iter
;
1320 struct strmap_entry
*e
;
1322 int original_cache_nr
;
1324 if (strmap_empty(conflicted
))
1327 original_cache_nr
= index
->cache_nr
;
1329 /* Put every entry from paths into plist, then sort */
1330 strmap_for_each_entry(conflicted
, &iter
, e
) {
1331 const char *path
= e
->key
;
1332 struct conflict_info
*ci
= e
->value
;
1334 struct cache_entry
*ce
;
1340 * The index will already have a stage=0 entry for this path,
1341 * because we created an as-merged-as-possible version of the
1342 * file and checkout() moved the working copy and index over
1345 * However, previous iterations through this loop will have
1346 * added unstaged entries to the end of the cache which
1347 * ignore the standard alphabetical ordering of cache
1348 * entries and break invariants needed for index_name_pos()
1349 * to work. However, we know the entry we want is before
1350 * those appended cache entries, so do a temporary swap on
1351 * cache_nr to only look through entries of interest.
1353 SWAP(index
->cache_nr
, original_cache_nr
);
1354 pos
= index_name_pos(index
, path
, strlen(path
));
1355 SWAP(index
->cache_nr
, original_cache_nr
);
1357 if (ci
->filemask
!= 1)
1358 BUG("Conflicted %s but nothing in basic working tree or index; this shouldn't happen", path
);
1359 cache_tree_invalidate_path(index
, path
);
1361 ce
= index
->cache
[pos
];
1364 * Clean paths with CE_SKIP_WORKTREE set will not be
1365 * written to the working tree by the unpack_trees()
1366 * call in checkout(). Our conflicted entries would
1367 * have appeared clean to that code since we ignored
1368 * the higher order stages. Thus, we need override
1369 * the CE_SKIP_WORKTREE bit and manually write those
1370 * files to the working disk here.
1372 * TODO: Implement this CE_SKIP_WORKTREE fixup.
1376 * Mark this cache entry for removal and instead add
1377 * new stage>0 entries corresponding to the
1378 * conflicts. If there are many conflicted entries, we
1379 * want to avoid memmove'ing O(NM) entries by
1380 * inserting the new entries one at a time. So,
1381 * instead, we just add the new cache entries to the
1382 * end (ignoring normal index requirements on sort
1383 * order) and sort the index once we're all done.
1385 ce
->ce_flags
|= CE_REMOVE
;
1388 for (i
= MERGE_BASE
; i
<= MERGE_SIDE2
; i
++) {
1389 struct version_info
*vi
;
1390 if (!(ci
->filemask
& (1ul << i
)))
1392 vi
= &ci
->stages
[i
];
1393 ce
= make_cache_entry(index
, vi
->mode
, &vi
->oid
,
1395 add_index_entry(index
, ce
, ADD_CACHE_JUST_APPEND
);
1400 * Remove the unused cache entries (and invalidate the relevant
1401 * cache-trees), then sort the index entries to get the conflicted
1402 * entries we added to the end into their right locations.
1404 remove_marked_cache_entries(index
, 1);
1405 QSORT(index
->cache
, index
->cache_nr
, cmp_cache_name_compare
);
1410 void merge_switch_to_result(struct merge_options
*opt
,
1412 struct merge_result
*result
,
1413 int update_worktree_and_index
,
1414 int display_update_msgs
)
1416 assert(opt
->priv
== NULL
);
1417 if (result
->clean
>= 0 && update_worktree_and_index
) {
1418 struct merge_options_internal
*opti
= result
->priv
;
1420 if (checkout(opt
, head
, result
->tree
)) {
1421 /* failure to function */
1426 if (record_conflicted_index_entries(opt
, opt
->repo
->index
,
1428 &opti
->conflicted
)) {
1429 /* failure to function */
1435 if (display_update_msgs
) {
1436 struct merge_options_internal
*opti
= result
->priv
;
1437 struct hashmap_iter iter
;
1438 struct strmap_entry
*e
;
1439 struct string_list olist
= STRING_LIST_INIT_NODUP
;
1442 /* Hack to pre-allocate olist to the desired size */
1443 ALLOC_GROW(olist
.items
, strmap_get_size(&opti
->output
),
1446 /* Put every entry from output into olist, then sort */
1447 strmap_for_each_entry(&opti
->output
, &iter
, e
) {
1448 string_list_append(&olist
, e
->key
)->util
= e
->value
;
1450 string_list_sort(&olist
);
1452 /* Iterate over the items, printing them */
1453 for (i
= 0; i
< olist
.nr
; ++i
) {
1454 struct strbuf
*sb
= olist
.items
[i
].util
;
1456 printf("%s", sb
->buf
);
1458 string_list_clear(&olist
, 0);
1461 merge_finalize(opt
, result
);
1464 void merge_finalize(struct merge_options
*opt
,
1465 struct merge_result
*result
)
1467 struct merge_options_internal
*opti
= result
->priv
;
1469 assert(opt
->priv
== NULL
);
1471 clear_internal_opts(opti
, 0);
1472 FREE_AND_NULL(opti
);
1475 /*** Function Grouping: helper functions for merge_incore_*() ***/
1477 static void merge_start(struct merge_options
*opt
, struct merge_result
*result
)
1479 /* Sanity checks on opt */
1482 assert(opt
->branch1
&& opt
->branch2
);
1484 assert(opt
->detect_directory_renames
>= MERGE_DIRECTORY_RENAMES_NONE
&&
1485 opt
->detect_directory_renames
<= MERGE_DIRECTORY_RENAMES_TRUE
);
1486 assert(opt
->rename_limit
>= -1);
1487 assert(opt
->rename_score
>= 0 && opt
->rename_score
<= MAX_SCORE
);
1488 assert(opt
->show_rename_progress
>= 0 && opt
->show_rename_progress
<= 1);
1490 assert(opt
->xdl_opts
>= 0);
1491 assert(opt
->recursive_variant
>= MERGE_VARIANT_NORMAL
&&
1492 opt
->recursive_variant
<= MERGE_VARIANT_THEIRS
);
1495 * detect_renames, verbosity, buffer_output, and obuf are ignored
1496 * fields that were used by "recursive" rather than "ort" -- but
1497 * sanity check them anyway.
1499 assert(opt
->detect_renames
>= -1 &&
1500 opt
->detect_renames
<= DIFF_DETECT_COPY
);
1501 assert(opt
->verbosity
>= 0 && opt
->verbosity
<= 5);
1502 assert(opt
->buffer_output
<= 2);
1503 assert(opt
->obuf
.len
== 0);
1505 assert(opt
->priv
== NULL
);
1507 /* Default to histogram diff. Actually, just hardcode it...for now. */
1508 opt
->xdl_opts
= DIFF_WITH_ALG(opt
, HISTOGRAM_DIFF
);
1510 /* Initialization of opt->priv, our internal merge data */
1511 opt
->priv
= xcalloc(1, sizeof(*opt
->priv
));
1514 * Although we initialize opt->priv->paths with strdup_strings=0,
1515 * that's just to avoid making yet another copy of an allocated
1516 * string. Putting the entry into paths means we are taking
1517 * ownership, so we will later free it. paths_to_free is similar.
1519 * In contrast, conflicted just has a subset of keys from paths, so
1520 * we don't want to free those (it'd be a duplicate free).
1522 strmap_init_with_options(&opt
->priv
->paths
, NULL
, 0);
1523 strmap_init_with_options(&opt
->priv
->conflicted
, NULL
, 0);
1524 string_list_init(&opt
->priv
->paths_to_free
, 0);
1527 * keys & strbufs in output will sometimes need to outlive "paths",
1528 * so it will have a copy of relevant keys. It's probably a small
1529 * subset of the overall paths that have special output.
1531 strmap_init(&opt
->priv
->output
);
1534 /*** Function Grouping: merge_incore_*() and their internal variants ***/
1537 * Originally from merge_trees_internal(); heavily adapted, though.
1539 static void merge_ort_nonrecursive_internal(struct merge_options
*opt
,
1540 struct tree
*merge_base
,
1543 struct merge_result
*result
)
1545 struct object_id working_tree_oid
;
1547 if (collect_merge_info(opt
, merge_base
, side1
, side2
) != 0) {
1549 * TRANSLATORS: The %s arguments are: 1) tree hash of a merge
1550 * base, and 2-3) the trees for the two trees we're merging.
1552 err(opt
, _("collecting merge info failed for trees %s, %s, %s"),
1553 oid_to_hex(&merge_base
->object
.oid
),
1554 oid_to_hex(&side1
->object
.oid
),
1555 oid_to_hex(&side2
->object
.oid
));
1560 result
->clean
= detect_and_process_renames(opt
, merge_base
,
1562 process_entries(opt
, &working_tree_oid
);
1564 /* Set return values */
1565 result
->tree
= parse_tree_indirect(&working_tree_oid
);
1566 /* existence of conflicted entries implies unclean */
1567 result
->clean
&= strmap_empty(&opt
->priv
->conflicted
);
1568 if (!opt
->priv
->call_depth
) {
1569 result
->priv
= opt
->priv
;
1574 void merge_incore_nonrecursive(struct merge_options
*opt
,
1575 struct tree
*merge_base
,
1578 struct merge_result
*result
)
1580 assert(opt
->ancestor
!= NULL
);
1581 merge_start(opt
, result
);
1582 merge_ort_nonrecursive_internal(opt
, merge_base
, side1
, side2
, result
);
1585 void merge_incore_recursive(struct merge_options
*opt
,
1586 struct commit_list
*merge_bases
,
1587 struct commit
*side1
,
1588 struct commit
*side2
,
1589 struct merge_result
*result
)
1591 die("Not yet implemented");