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![Junio C Hamano](/assets/img/avatar_default.png)
* jc/read-tree: t6022: ignoring untracked files by merge-recursive when they do not matter merge-recursive: adjust to loosened "working file clobbered" check merge-recursive: make a few functions static. merge-recursive: use abbreviated commit object name. merge: loosen overcautious "working file will be lost" check.
1353 lines
35 KiB
C
1353 lines
35 KiB
C
/*
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* Recursive Merge algorithm stolen from git-merge-recursive.py by
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* Fredrik Kuivinen.
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* The thieves were Alex Riesen and Johannes Schindelin, in June/July 2006
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*/
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#include <stdarg.h>
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#include <string.h>
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#include <assert.h>
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#include <sys/wait.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <time.h>
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#include "cache.h"
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#include "cache-tree.h"
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#include "commit.h"
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#include "blob.h"
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#include "tree-walk.h"
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#include "diff.h"
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#include "diffcore.h"
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#include "run-command.h"
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#include "tag.h"
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#include "unpack-trees.h"
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#include "path-list.h"
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/*
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* A virtual commit has
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* - (const char *)commit->util set to the name, and
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* - *(int *)commit->object.sha1 set to the virtual id.
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*/
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static unsigned commit_list_count(const struct commit_list *l)
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{
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unsigned c = 0;
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for (; l; l = l->next )
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c++;
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return c;
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}
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static struct commit *make_virtual_commit(struct tree *tree, const char *comment)
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{
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struct commit *commit = xcalloc(1, sizeof(struct commit));
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static unsigned virtual_id = 1;
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commit->tree = tree;
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commit->util = (void*)comment;
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*(int*)commit->object.sha1 = virtual_id++;
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/* avoid warnings */
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commit->object.parsed = 1;
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return commit;
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}
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/*
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* Since we use get_tree_entry(), which does not put the read object into
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* the object pool, we cannot rely on a == b.
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*/
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static int sha_eq(const unsigned char *a, const unsigned char *b)
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{
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if (!a && !b)
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return 2;
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return a && b && hashcmp(a, b) == 0;
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}
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/*
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* Since we want to write the index eventually, we cannot reuse the index
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* for these (temporary) data.
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*/
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struct stage_data
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{
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struct
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{
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unsigned mode;
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unsigned char sha[20];
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} stages[4];
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unsigned processed:1;
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};
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static struct path_list current_file_set = {NULL, 0, 0, 1};
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static struct path_list current_directory_set = {NULL, 0, 0, 1};
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static int output_indent = 0;
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static void output(const char *fmt, ...)
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{
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va_list args;
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int i;
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for (i = output_indent; i--;)
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fputs(" ", stdout);
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va_start(args, fmt);
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vfprintf(stdout, fmt, args);
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va_end(args);
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fputc('\n', stdout);
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}
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static void output_commit_title(struct commit *commit)
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{
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int i;
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for (i = output_indent; i--;)
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fputs(" ", stdout);
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if (commit->util)
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printf("virtual %s\n", (char *)commit->util);
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else {
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printf("%s ", find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV));
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if (parse_commit(commit) != 0)
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printf("(bad commit)\n");
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else {
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const char *s;
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int len;
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for (s = commit->buffer; *s; s++)
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if (*s == '\n' && s[1] == '\n') {
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s += 2;
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break;
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}
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for (len = 0; s[len] && '\n' != s[len]; len++)
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; /* do nothing */
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printf("%.*s\n", len, s);
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}
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}
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}
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static const char *current_index_file = NULL;
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static const char *original_index_file;
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static const char *temporary_index_file;
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static int cache_dirty = 0;
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static int flush_cache(void)
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{
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/* flush temporary index */
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struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
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int fd = hold_lock_file_for_update(lock, current_index_file, 1);
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if (write_cache(fd, active_cache, active_nr) ||
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close(fd) || commit_lock_file(lock))
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die ("unable to write %s", current_index_file);
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discard_cache();
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cache_dirty = 0;
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return 0;
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}
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static void setup_index(int temp)
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{
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current_index_file = temp ? temporary_index_file: original_index_file;
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if (cache_dirty) {
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discard_cache();
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cache_dirty = 0;
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}
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unlink(temporary_index_file);
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discard_cache();
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}
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static struct cache_entry *make_cache_entry(unsigned int mode,
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const unsigned char *sha1, const char *path, int stage, int refresh)
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{
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int size, len;
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struct cache_entry *ce;
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if (!verify_path(path))
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return NULL;
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len = strlen(path);
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size = cache_entry_size(len);
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ce = xcalloc(1, size);
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hashcpy(ce->sha1, sha1);
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memcpy(ce->name, path, len);
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ce->ce_flags = create_ce_flags(len, stage);
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ce->ce_mode = create_ce_mode(mode);
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if (refresh)
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return refresh_cache_entry(ce, 0);
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return ce;
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}
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static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
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const char *path, int stage, int refresh, int options)
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{
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struct cache_entry *ce;
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if (!cache_dirty)
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read_cache_from(current_index_file);
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cache_dirty++;
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ce = make_cache_entry(mode, sha1 ? sha1 : null_sha1, path, stage, refresh);
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if (!ce)
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return error("cache_addinfo failed: %s", strerror(cache_errno));
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return add_cache_entry(ce, options);
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}
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/*
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* This is a global variable which is used in a number of places but
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* only written to in the 'merge' function.
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*
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* index_only == 1 => Don't leave any non-stage 0 entries in the cache and
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* don't update the working directory.
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* 0 => Leave unmerged entries in the cache and update
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* the working directory.
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*/
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static int index_only = 0;
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static int git_read_tree(struct tree *tree)
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{
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int rc;
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struct object_list *trees = NULL;
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struct unpack_trees_options opts;
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if (cache_dirty)
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die("read-tree with dirty cache");
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memset(&opts, 0, sizeof(opts));
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object_list_append(&tree->object, &trees);
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rc = unpack_trees(trees, &opts);
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cache_tree_free(&active_cache_tree);
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if (rc == 0)
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cache_dirty = 1;
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return rc;
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}
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static int git_merge_trees(int index_only,
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struct tree *common,
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struct tree *head,
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struct tree *merge)
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{
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int rc;
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struct object_list *trees = NULL;
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struct unpack_trees_options opts;
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if (!cache_dirty) {
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read_cache_from(current_index_file);
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cache_dirty = 1;
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}
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memset(&opts, 0, sizeof(opts));
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if (index_only)
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opts.index_only = 1;
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else
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opts.update = 1;
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opts.merge = 1;
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opts.head_idx = 2;
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opts.fn = threeway_merge;
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object_list_append(&common->object, &trees);
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object_list_append(&head->object, &trees);
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object_list_append(&merge->object, &trees);
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rc = unpack_trees(trees, &opts);
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cache_tree_free(&active_cache_tree);
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cache_dirty = 1;
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return rc;
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}
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static struct tree *git_write_tree(void)
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{
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struct tree *result = NULL;
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if (cache_dirty) {
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unsigned i;
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for (i = 0; i < active_nr; i++) {
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struct cache_entry *ce = active_cache[i];
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if (ce_stage(ce))
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return NULL;
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}
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} else
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read_cache_from(current_index_file);
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if (!active_cache_tree)
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active_cache_tree = cache_tree();
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if (!cache_tree_fully_valid(active_cache_tree) &&
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cache_tree_update(active_cache_tree,
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active_cache, active_nr, 0, 0) < 0)
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die("error building trees");
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result = lookup_tree(active_cache_tree->sha1);
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flush_cache();
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cache_dirty = 0;
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return result;
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}
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static int save_files_dirs(const unsigned char *sha1,
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const char *base, int baselen, const char *path,
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unsigned int mode, int stage)
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{
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int len = strlen(path);
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char *newpath = xmalloc(baselen + len + 1);
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memcpy(newpath, base, baselen);
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memcpy(newpath + baselen, path, len);
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newpath[baselen + len] = '\0';
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if (S_ISDIR(mode))
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path_list_insert(newpath, ¤t_directory_set);
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else
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path_list_insert(newpath, ¤t_file_set);
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free(newpath);
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return READ_TREE_RECURSIVE;
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}
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static int get_files_dirs(struct tree *tree)
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{
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int n;
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if (read_tree_recursive(tree, "", 0, 0, NULL, save_files_dirs) != 0)
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return 0;
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n = current_file_set.nr + current_directory_set.nr;
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return n;
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}
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/*
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* Returns a index_entry instance which doesn't have to correspond to
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* a real cache entry in Git's index.
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*/
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static struct stage_data *insert_stage_data(const char *path,
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struct tree *o, struct tree *a, struct tree *b,
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struct path_list *entries)
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{
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struct path_list_item *item;
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struct stage_data *e = xcalloc(1, sizeof(struct stage_data));
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get_tree_entry(o->object.sha1, path,
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e->stages[1].sha, &e->stages[1].mode);
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get_tree_entry(a->object.sha1, path,
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e->stages[2].sha, &e->stages[2].mode);
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get_tree_entry(b->object.sha1, path,
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e->stages[3].sha, &e->stages[3].mode);
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item = path_list_insert(path, entries);
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item->util = e;
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return e;
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}
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/*
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* Create a dictionary mapping file names to stage_data objects. The
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* dictionary contains one entry for every path with a non-zero stage entry.
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*/
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static struct path_list *get_unmerged(void)
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{
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struct path_list *unmerged = xcalloc(1, sizeof(struct path_list));
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int i;
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unmerged->strdup_paths = 1;
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if (!cache_dirty) {
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read_cache_from(current_index_file);
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cache_dirty++;
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}
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for (i = 0; i < active_nr; i++) {
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struct path_list_item *item;
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struct stage_data *e;
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struct cache_entry *ce = active_cache[i];
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if (!ce_stage(ce))
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continue;
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item = path_list_lookup(ce->name, unmerged);
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if (!item) {
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item = path_list_insert(ce->name, unmerged);
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item->util = xcalloc(1, sizeof(struct stage_data));
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}
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e = item->util;
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e->stages[ce_stage(ce)].mode = ntohl(ce->ce_mode);
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hashcpy(e->stages[ce_stage(ce)].sha, ce->sha1);
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}
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return unmerged;
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}
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struct rename
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{
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struct diff_filepair *pair;
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struct stage_data *src_entry;
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struct stage_data *dst_entry;
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unsigned processed:1;
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};
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/*
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* Get information of all renames which occured between 'o_tree' and
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* 'tree'. We need the three trees in the merge ('o_tree', 'a_tree' and
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* 'b_tree') to be able to associate the correct cache entries with
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* the rename information. 'tree' is always equal to either a_tree or b_tree.
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*/
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static struct path_list *get_renames(struct tree *tree,
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struct tree *o_tree,
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struct tree *a_tree,
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struct tree *b_tree,
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struct path_list *entries)
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{
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int i;
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struct path_list *renames;
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struct diff_options opts;
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renames = xcalloc(1, sizeof(struct path_list));
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diff_setup(&opts);
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opts.recursive = 1;
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opts.detect_rename = DIFF_DETECT_RENAME;
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opts.output_format = DIFF_FORMAT_NO_OUTPUT;
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if (diff_setup_done(&opts) < 0)
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die("diff setup failed");
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diff_tree_sha1(o_tree->object.sha1, tree->object.sha1, "", &opts);
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diffcore_std(&opts);
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for (i = 0; i < diff_queued_diff.nr; ++i) {
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struct path_list_item *item;
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struct rename *re;
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struct diff_filepair *pair = diff_queued_diff.queue[i];
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if (pair->status != 'R') {
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diff_free_filepair(pair);
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continue;
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}
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re = xmalloc(sizeof(*re));
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re->processed = 0;
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re->pair = pair;
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item = path_list_lookup(re->pair->one->path, entries);
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if (!item)
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re->src_entry = insert_stage_data(re->pair->one->path,
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o_tree, a_tree, b_tree, entries);
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else
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re->src_entry = item->util;
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item = path_list_lookup(re->pair->two->path, entries);
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if (!item)
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re->dst_entry = insert_stage_data(re->pair->two->path,
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o_tree, a_tree, b_tree, entries);
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else
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re->dst_entry = item->util;
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item = path_list_insert(pair->one->path, renames);
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item->util = re;
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}
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opts.output_format = DIFF_FORMAT_NO_OUTPUT;
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diff_queued_diff.nr = 0;
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diff_flush(&opts);
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return renames;
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}
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static int update_stages(const char *path, struct diff_filespec *o,
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struct diff_filespec *a, struct diff_filespec *b,
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int clear)
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{
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int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE;
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if (clear)
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if (remove_file_from_cache(path))
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return -1;
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if (o)
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if (add_cacheinfo(o->mode, o->sha1, path, 1, 0, options))
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return -1;
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if (a)
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if (add_cacheinfo(a->mode, a->sha1, path, 2, 0, options))
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return -1;
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if (b)
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if (add_cacheinfo(b->mode, b->sha1, path, 3, 0, options))
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return -1;
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return 0;
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}
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static int remove_path(const char *name)
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{
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int ret, len;
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char *slash, *dirs;
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ret = unlink(name);
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if (ret)
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return ret;
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len = strlen(name);
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dirs = xmalloc(len+1);
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memcpy(dirs, name, len);
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dirs[len] = '\0';
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while ((slash = strrchr(name, '/'))) {
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*slash = '\0';
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len = slash - name;
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if (rmdir(name) != 0)
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break;
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}
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free(dirs);
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return ret;
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}
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static int remove_file(int clean, const char *path, int no_wd)
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{
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int update_cache = index_only || clean;
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int update_working_directory = !index_only && !no_wd;
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if (update_cache) {
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if (!cache_dirty)
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read_cache_from(current_index_file);
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cache_dirty++;
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if (remove_file_from_cache(path))
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return -1;
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}
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if (update_working_directory) {
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unlink(path);
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if (errno != ENOENT || errno != EISDIR)
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return -1;
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remove_path(path);
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}
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return 0;
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}
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static char *unique_path(const char *path, const char *branch)
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|
{
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char *newpath = xmalloc(strlen(path) + 1 + strlen(branch) + 8 + 1);
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int suffix = 0;
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struct stat st;
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char *p = newpath + strlen(path);
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strcpy(newpath, path);
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*(p++) = '~';
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strcpy(p, branch);
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for (; *p; ++p)
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if ('/' == *p)
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*p = '_';
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while (path_list_has_path(¤t_file_set, newpath) ||
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path_list_has_path(¤t_directory_set, newpath) ||
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lstat(newpath, &st) == 0)
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sprintf(p, "_%d", suffix++);
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path_list_insert(newpath, ¤t_file_set);
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return newpath;
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}
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static int mkdir_p(const char *path, unsigned long mode)
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{
|
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/* path points to cache entries, so xstrdup before messing with it */
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char *buf = xstrdup(path);
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int result = safe_create_leading_directories(buf);
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free(buf);
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return result;
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}
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|
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static void flush_buffer(int fd, const char *buf, unsigned long size)
|
|
{
|
|
while (size > 0) {
|
|
long ret = xwrite(fd, buf, size);
|
|
if (ret < 0) {
|
|
/* Ignore epipe */
|
|
if (errno == EPIPE)
|
|
break;
|
|
die("merge-recursive: %s", strerror(errno));
|
|
} else if (!ret) {
|
|
die("merge-recursive: disk full?");
|
|
}
|
|
size -= ret;
|
|
buf += ret;
|
|
}
|
|
}
|
|
|
|
static void update_file_flags(const unsigned char *sha,
|
|
unsigned mode,
|
|
const char *path,
|
|
int update_cache,
|
|
int update_wd)
|
|
{
|
|
if (index_only)
|
|
update_wd = 0;
|
|
|
|
if (update_wd) {
|
|
char type[20];
|
|
void *buf;
|
|
unsigned long size;
|
|
|
|
buf = read_sha1_file(sha, type, &size);
|
|
if (!buf)
|
|
die("cannot read object %s '%s'", sha1_to_hex(sha), path);
|
|
if (strcmp(type, blob_type) != 0)
|
|
die("blob expected for %s '%s'", sha1_to_hex(sha), path);
|
|
|
|
if (S_ISREG(mode)) {
|
|
int fd;
|
|
if (mkdir_p(path, 0777))
|
|
die("failed to create path %s: %s", path, strerror(errno));
|
|
unlink(path);
|
|
if (mode & 0100)
|
|
mode = 0777;
|
|
else
|
|
mode = 0666;
|
|
fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
|
|
if (fd < 0)
|
|
die("failed to open %s: %s", path, strerror(errno));
|
|
flush_buffer(fd, buf, size);
|
|
close(fd);
|
|
} else if (S_ISLNK(mode)) {
|
|
char *lnk = xmalloc(size + 1);
|
|
memcpy(lnk, buf, size);
|
|
lnk[size] = '\0';
|
|
mkdir_p(path, 0777);
|
|
unlink(lnk);
|
|
symlink(lnk, path);
|
|
} else
|
|
die("do not know what to do with %06o %s '%s'",
|
|
mode, sha1_to_hex(sha), path);
|
|
}
|
|
if (update_cache)
|
|
add_cacheinfo(mode, sha, path, 0, update_wd, ADD_CACHE_OK_TO_ADD);
|
|
}
|
|
|
|
static void update_file(int clean,
|
|
const unsigned char *sha,
|
|
unsigned mode,
|
|
const char *path)
|
|
{
|
|
update_file_flags(sha, mode, path, index_only || clean, !index_only);
|
|
}
|
|
|
|
/* Low level file merging, update and removal */
|
|
|
|
struct merge_file_info
|
|
{
|
|
unsigned char sha[20];
|
|
unsigned mode;
|
|
unsigned clean:1,
|
|
merge:1;
|
|
};
|
|
|
|
static char *git_unpack_file(const unsigned char *sha1, char *path)
|
|
{
|
|
void *buf;
|
|
char type[20];
|
|
unsigned long size;
|
|
int fd;
|
|
|
|
buf = read_sha1_file(sha1, type, &size);
|
|
if (!buf || strcmp(type, blob_type))
|
|
die("unable to read blob object %s", sha1_to_hex(sha1));
|
|
|
|
strcpy(path, ".merge_file_XXXXXX");
|
|
fd = mkstemp(path);
|
|
if (fd < 0)
|
|
die("unable to create temp-file");
|
|
flush_buffer(fd, buf, size);
|
|
close(fd);
|
|
return path;
|
|
}
|
|
|
|
static struct merge_file_info merge_file(struct diff_filespec *o,
|
|
struct diff_filespec *a, 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;
|
|
hashcpy(result.sha, a->sha1);
|
|
} else {
|
|
result.mode = b->mode;
|
|
hashcpy(result.sha, b->sha1);
|
|
}
|
|
} else {
|
|
if (!sha_eq(a->sha1, o->sha1) && !sha_eq(b->sha1, o->sha1))
|
|
result.merge = 1;
|
|
|
|
result.mode = a->mode == o->mode ? b->mode: a->mode;
|
|
|
|
if (sha_eq(a->sha1, o->sha1))
|
|
hashcpy(result.sha, b->sha1);
|
|
else if (sha_eq(b->sha1, o->sha1))
|
|
hashcpy(result.sha, a->sha1);
|
|
else if (S_ISREG(a->mode)) {
|
|
int code = 1, fd;
|
|
struct stat st;
|
|
char orig[PATH_MAX];
|
|
char src1[PATH_MAX];
|
|
char src2[PATH_MAX];
|
|
const char *argv[] = {
|
|
"merge", "-L", NULL, "-L", NULL, "-L", NULL,
|
|
NULL, NULL, NULL,
|
|
NULL
|
|
};
|
|
char *la, *lb, *lo;
|
|
|
|
git_unpack_file(o->sha1, orig);
|
|
git_unpack_file(a->sha1, src1);
|
|
git_unpack_file(b->sha1, src2);
|
|
|
|
argv[2] = la = xstrdup(mkpath("%s/%s", branch1, a->path));
|
|
argv[6] = lb = xstrdup(mkpath("%s/%s", branch2, b->path));
|
|
argv[4] = lo = xstrdup(mkpath("orig/%s", o->path));
|
|
argv[7] = src1;
|
|
argv[8] = orig;
|
|
argv[9] = src2,
|
|
|
|
code = run_command_v(10, argv);
|
|
|
|
free(la);
|
|
free(lb);
|
|
free(lo);
|
|
if (code && code < -256) {
|
|
die("Failed to execute 'merge'. merge(1) is used as the "
|
|
"file-level merge tool. Is 'merge' in your path?");
|
|
}
|
|
fd = open(src1, O_RDONLY);
|
|
if (fd < 0 || fstat(fd, &st) < 0 ||
|
|
index_fd(result.sha, fd, &st, 1,
|
|
"blob"))
|
|
die("Unable to add %s to database", src1);
|
|
|
|
unlink(orig);
|
|
unlink(src1);
|
|
unlink(src2);
|
|
|
|
result.clean = WEXITSTATUS(code) == 0;
|
|
} else {
|
|
if (!(S_ISLNK(a->mode) || S_ISLNK(b->mode)))
|
|
die("cannot merge modes?");
|
|
|
|
hashcpy(result.sha, a->sha1);
|
|
|
|
if (!sha_eq(a->sha1, b->sha1))
|
|
result.clean = 0;
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static void conflict_rename_rename(struct rename *ren1,
|
|
const char *branch1,
|
|
struct rename *ren2,
|
|
const char *branch2)
|
|
{
|
|
char *del[2];
|
|
int delp = 0;
|
|
const char *ren1_dst = ren1->pair->two->path;
|
|
const char *ren2_dst = ren2->pair->two->path;
|
|
const char *dst_name1 = ren1_dst;
|
|
const char *dst_name2 = ren2_dst;
|
|
if (path_list_has_path(¤t_directory_set, ren1_dst)) {
|
|
dst_name1 = del[delp++] = unique_path(ren1_dst, branch1);
|
|
output("%s is a directory in %s adding as %s instead",
|
|
ren1_dst, branch2, dst_name1);
|
|
remove_file(0, ren1_dst, 0);
|
|
}
|
|
if (path_list_has_path(¤t_directory_set, ren2_dst)) {
|
|
dst_name2 = del[delp++] = unique_path(ren2_dst, branch2);
|
|
output("%s is a directory in %s adding as %s instead",
|
|
ren2_dst, branch1, dst_name2);
|
|
remove_file(0, ren2_dst, 0);
|
|
}
|
|
update_stages(dst_name1, NULL, ren1->pair->two, NULL, 1);
|
|
update_stages(dst_name2, NULL, NULL, ren2->pair->two, 1);
|
|
while (delp--)
|
|
free(del[delp]);
|
|
}
|
|
|
|
static void conflict_rename_dir(struct rename *ren1,
|
|
const char *branch1)
|
|
{
|
|
char *new_path = unique_path(ren1->pair->two->path, branch1);
|
|
output("Renaming %s to %s instead", ren1->pair->one->path, new_path);
|
|
remove_file(0, ren1->pair->two->path, 0);
|
|
update_file(0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path);
|
|
free(new_path);
|
|
}
|
|
|
|
static void conflict_rename_rename_2(struct rename *ren1,
|
|
const char *branch1,
|
|
struct rename *ren2,
|
|
const char *branch2)
|
|
{
|
|
char *new_path1 = unique_path(ren1->pair->two->path, branch1);
|
|
char *new_path2 = unique_path(ren2->pair->two->path, branch2);
|
|
output("Renaming %s to %s and %s to %s instead",
|
|
ren1->pair->one->path, new_path1,
|
|
ren2->pair->one->path, new_path2);
|
|
remove_file(0, ren1->pair->two->path, 0);
|
|
update_file(0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path1);
|
|
update_file(0, ren2->pair->two->sha1, ren2->pair->two->mode, new_path2);
|
|
free(new_path2);
|
|
free(new_path1);
|
|
}
|
|
|
|
static int process_renames(struct path_list *a_renames,
|
|
struct path_list *b_renames,
|
|
const char *a_branch,
|
|
const char *b_branch)
|
|
{
|
|
int clean_merge = 1, i, j;
|
|
struct path_list a_by_dst = {NULL, 0, 0, 0}, b_by_dst = {NULL, 0, 0, 0};
|
|
const struct rename *sre;
|
|
|
|
for (i = 0; i < a_renames->nr; i++) {
|
|
sre = a_renames->items[i].util;
|
|
path_list_insert(sre->pair->two->path, &a_by_dst)->util
|
|
= sre->dst_entry;
|
|
}
|
|
for (i = 0; i < b_renames->nr; i++) {
|
|
sre = b_renames->items[i].util;
|
|
path_list_insert(sre->pair->two->path, &b_by_dst)->util
|
|
= sre->dst_entry;
|
|
}
|
|
|
|
for (i = 0, j = 0; i < a_renames->nr || j < b_renames->nr;) {
|
|
int compare;
|
|
char *src;
|
|
struct path_list *renames1, *renames2, *renames2Dst;
|
|
struct rename *ren1 = NULL, *ren2 = NULL;
|
|
const char *branch1, *branch2;
|
|
const char *ren1_src, *ren1_dst;
|
|
|
|
if (i >= a_renames->nr) {
|
|
compare = 1;
|
|
ren2 = b_renames->items[j++].util;
|
|
} else if (j >= b_renames->nr) {
|
|
compare = -1;
|
|
ren1 = a_renames->items[i++].util;
|
|
} else {
|
|
compare = strcmp(a_renames->items[i].path,
|
|
b_renames->items[j].path);
|
|
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;
|
|
renames2 = b_renames;
|
|
renames2Dst = &b_by_dst;
|
|
branch1 = a_branch;
|
|
branch2 = b_branch;
|
|
} else {
|
|
struct rename *tmp;
|
|
renames1 = b_renames;
|
|
renames2 = a_renames;
|
|
renames2Dst = &a_by_dst;
|
|
branch1 = b_branch;
|
|
branch2 = a_branch;
|
|
tmp = ren2;
|
|
ren2 = ren1;
|
|
ren1 = tmp;
|
|
}
|
|
src = ren1->pair->one->path;
|
|
|
|
ren1->dst_entry->processed = 1;
|
|
ren1->src_entry->processed = 1;
|
|
|
|
if (ren1->processed)
|
|
continue;
|
|
ren1->processed = 1;
|
|
|
|
ren1_src = ren1->pair->one->path;
|
|
ren1_dst = ren1->pair->two->path;
|
|
|
|
if (ren2) {
|
|
const char *ren2_src = ren2->pair->one->path;
|
|
const char *ren2_dst = ren2->pair->two->path;
|
|
/* Renamed in 1 and renamed in 2 */
|
|
if (strcmp(ren1_src, ren2_src) != 0)
|
|
die("ren1.src != ren2.src");
|
|
ren2->dst_entry->processed = 1;
|
|
ren2->processed = 1;
|
|
if (strcmp(ren1_dst, ren2_dst) != 0) {
|
|
clean_merge = 0;
|
|
output("CONFLICT (rename/rename): "
|
|
"Rename %s->%s in branch %s "
|
|
"rename %s->%s in %s",
|
|
src, ren1_dst, branch1,
|
|
src, ren2_dst, branch2);
|
|
conflict_rename_rename(ren1, branch1, ren2, branch2);
|
|
} else {
|
|
struct merge_file_info mfi;
|
|
remove_file(1, ren1_src, 1);
|
|
mfi = merge_file(ren1->pair->one,
|
|
ren1->pair->two,
|
|
ren2->pair->two,
|
|
branch1,
|
|
branch2);
|
|
if (mfi.merge || !mfi.clean)
|
|
output("Renaming %s->%s", src, ren1_dst);
|
|
|
|
if (mfi.merge)
|
|
output("Auto-merging %s", ren1_dst);
|
|
|
|
if (!mfi.clean) {
|
|
output("CONFLICT (content): merge conflict in %s",
|
|
ren1_dst);
|
|
clean_merge = 0;
|
|
|
|
if (!index_only)
|
|
update_stages(ren1_dst,
|
|
ren1->pair->one,
|
|
ren1->pair->two,
|
|
ren2->pair->two,
|
|
1 /* clear */);
|
|
}
|
|
update_file(mfi.clean, mfi.sha, mfi.mode, ren1_dst);
|
|
}
|
|
} else {
|
|
/* Renamed in 1, maybe changed in 2 */
|
|
struct path_list_item *item;
|
|
/* we only use sha1 and mode of these */
|
|
struct diff_filespec src_other, dst_other;
|
|
int try_merge, stage = a_renames == renames1 ? 3: 2;
|
|
|
|
remove_file(1, ren1_src, 1);
|
|
|
|
hashcpy(src_other.sha1, ren1->src_entry->stages[stage].sha);
|
|
src_other.mode = ren1->src_entry->stages[stage].mode;
|
|
hashcpy(dst_other.sha1, ren1->dst_entry->stages[stage].sha);
|
|
dst_other.mode = ren1->dst_entry->stages[stage].mode;
|
|
|
|
try_merge = 0;
|
|
|
|
if (path_list_has_path(¤t_directory_set, ren1_dst)) {
|
|
clean_merge = 0;
|
|
output("CONFLICT (rename/directory): Rename %s->%s in %s "
|
|
" directory %s added in %s",
|
|
ren1_src, ren1_dst, branch1,
|
|
ren1_dst, branch2);
|
|
conflict_rename_dir(ren1, branch1);
|
|
} else if (sha_eq(src_other.sha1, null_sha1)) {
|
|
clean_merge = 0;
|
|
output("CONFLICT (rename/delete): Rename %s->%s in %s "
|
|
"and deleted in %s",
|
|
ren1_src, ren1_dst, branch1,
|
|
branch2);
|
|
update_file(0, ren1->pair->two->sha1, ren1->pair->two->mode, ren1_dst);
|
|
} else if (!sha_eq(dst_other.sha1, null_sha1)) {
|
|
const char *new_path;
|
|
clean_merge = 0;
|
|
try_merge = 1;
|
|
output("CONFLICT (rename/add): Rename %s->%s in %s. "
|
|
"%s added in %s",
|
|
ren1_src, ren1_dst, branch1,
|
|
ren1_dst, branch2);
|
|
new_path = unique_path(ren1_dst, branch2);
|
|
output("Adding as %s instead", new_path);
|
|
update_file(0, dst_other.sha1, dst_other.mode, new_path);
|
|
} else if ((item = path_list_lookup(ren1_dst, renames2Dst))) {
|
|
ren2 = item->util;
|
|
clean_merge = 0;
|
|
ren2->processed = 1;
|
|
output("CONFLICT (rename/rename): Rename %s->%s in %s. "
|
|
"Rename %s->%s in %s",
|
|
ren1_src, ren1_dst, branch1,
|
|
ren2->pair->one->path, ren2->pair->two->path, branch2);
|
|
conflict_rename_rename_2(ren1, branch1, ren2, branch2);
|
|
} else
|
|
try_merge = 1;
|
|
|
|
if (try_merge) {
|
|
struct diff_filespec *o, *a, *b;
|
|
struct merge_file_info mfi;
|
|
src_other.path = (char *)ren1_src;
|
|
|
|
o = ren1->pair->one;
|
|
if (a_renames == renames1) {
|
|
a = ren1->pair->two;
|
|
b = &src_other;
|
|
} else {
|
|
b = ren1->pair->two;
|
|
a = &src_other;
|
|
}
|
|
mfi = merge_file(o, a, b,
|
|
a_branch, b_branch);
|
|
|
|
if (mfi.merge || !mfi.clean)
|
|
output("Renaming %s => %s", ren1_src, ren1_dst);
|
|
if (mfi.merge)
|
|
output("Auto-merging %s", ren1_dst);
|
|
if (!mfi.clean) {
|
|
output("CONFLICT (rename/modify): Merge conflict in %s",
|
|
ren1_dst);
|
|
clean_merge = 0;
|
|
|
|
if (!index_only)
|
|
update_stages(ren1_dst,
|
|
o, a, b, 1);
|
|
}
|
|
update_file(mfi.clean, mfi.sha, mfi.mode, ren1_dst);
|
|
}
|
|
}
|
|
}
|
|
path_list_clear(&a_by_dst, 0);
|
|
path_list_clear(&b_by_dst, 0);
|
|
|
|
if (cache_dirty)
|
|
flush_cache();
|
|
return clean_merge;
|
|
}
|
|
|
|
static unsigned char *has_sha(const unsigned char *sha)
|
|
{
|
|
return is_null_sha1(sha) ? NULL: (unsigned char *)sha;
|
|
}
|
|
|
|
/* Per entry merge function */
|
|
static int process_entry(const char *path, struct stage_data *entry,
|
|
const char *branch1,
|
|
const char *branch2)
|
|
{
|
|
/*
|
|
printf("processing entry, clean cache: %s\n", index_only ? "yes": "no");
|
|
print_index_entry("\tpath: ", entry);
|
|
*/
|
|
int clean_merge = 1;
|
|
unsigned char *o_sha = has_sha(entry->stages[1].sha);
|
|
unsigned char *a_sha = has_sha(entry->stages[2].sha);
|
|
unsigned char *b_sha = has_sha(entry->stages[3].sha);
|
|
unsigned o_mode = entry->stages[1].mode;
|
|
unsigned a_mode = entry->stages[2].mode;
|
|
unsigned b_mode = entry->stages[3].mode;
|
|
|
|
if (o_sha && (!a_sha || !b_sha)) {
|
|
/* Case A: Deleted in one */
|
|
if ((!a_sha && !b_sha) ||
|
|
(sha_eq(a_sha, o_sha) && !b_sha) ||
|
|
(!a_sha && sha_eq(b_sha, o_sha))) {
|
|
/* Deleted in both or deleted in one and
|
|
* unchanged in the other */
|
|
if (a_sha)
|
|
output("Removing %s", path);
|
|
/* do not touch working file if it did not exist */
|
|
remove_file(1, path, !a_sha);
|
|
} else {
|
|
/* Deleted in one and changed in the other */
|
|
clean_merge = 0;
|
|
if (!a_sha) {
|
|
output("CONFLICT (delete/modify): %s deleted in %s "
|
|
"and modified in %s. Version %s of %s left in tree.",
|
|
path, branch1,
|
|
branch2, branch2, path);
|
|
update_file(0, b_sha, b_mode, path);
|
|
} else {
|
|
output("CONFLICT (delete/modify): %s deleted in %s "
|
|
"and modified in %s. Version %s of %s left in tree.",
|
|
path, branch2,
|
|
branch1, branch1, path);
|
|
update_file(0, a_sha, a_mode, path);
|
|
}
|
|
}
|
|
|
|
} else if ((!o_sha && a_sha && !b_sha) ||
|
|
(!o_sha && !a_sha && b_sha)) {
|
|
/* Case B: Added in one. */
|
|
const char *add_branch;
|
|
const char *other_branch;
|
|
unsigned mode;
|
|
const unsigned char *sha;
|
|
const char *conf;
|
|
|
|
if (a_sha) {
|
|
add_branch = branch1;
|
|
other_branch = branch2;
|
|
mode = a_mode;
|
|
sha = a_sha;
|
|
conf = "file/directory";
|
|
} else {
|
|
add_branch = branch2;
|
|
other_branch = branch1;
|
|
mode = b_mode;
|
|
sha = b_sha;
|
|
conf = "directory/file";
|
|
}
|
|
if (path_list_has_path(¤t_directory_set, path)) {
|
|
const char *new_path = unique_path(path, add_branch);
|
|
clean_merge = 0;
|
|
output("CONFLICT (%s): There is a directory with name %s in %s. "
|
|
"Adding %s as %s",
|
|
conf, path, other_branch, path, new_path);
|
|
remove_file(0, path, 0);
|
|
update_file(0, sha, mode, new_path);
|
|
} else {
|
|
output("Adding %s", path);
|
|
update_file(1, sha, mode, path);
|
|
}
|
|
} else if (!o_sha && a_sha && b_sha) {
|
|
/* Case C: Added in both (check for same permissions). */
|
|
if (sha_eq(a_sha, b_sha)) {
|
|
if (a_mode != b_mode) {
|
|
clean_merge = 0;
|
|
output("CONFLICT: File %s added identically in both branches, "
|
|
"but permissions conflict %06o->%06o",
|
|
path, a_mode, b_mode);
|
|
output("CONFLICT: adding with permission: %06o", a_mode);
|
|
update_file(0, a_sha, a_mode, path);
|
|
} else {
|
|
/* This case is handled by git-read-tree */
|
|
assert(0 && "This case must be handled by git-read-tree");
|
|
}
|
|
} else {
|
|
const char *new_path1, *new_path2;
|
|
clean_merge = 0;
|
|
new_path1 = unique_path(path, branch1);
|
|
new_path2 = unique_path(path, branch2);
|
|
output("CONFLICT (add/add): File %s added non-identically "
|
|
"in both branches. Adding as %s and %s instead.",
|
|
path, new_path1, new_path2);
|
|
remove_file(0, path, 0);
|
|
update_file(0, a_sha, a_mode, new_path1);
|
|
update_file(0, b_sha, b_mode, new_path2);
|
|
}
|
|
|
|
} else if (o_sha && a_sha && b_sha) {
|
|
/* case D: Modified in both, but differently. */
|
|
struct merge_file_info mfi;
|
|
struct diff_filespec o, a, b;
|
|
|
|
output("Auto-merging %s", path);
|
|
o.path = a.path = b.path = (char *)path;
|
|
hashcpy(o.sha1, o_sha);
|
|
o.mode = o_mode;
|
|
hashcpy(a.sha1, a_sha);
|
|
a.mode = a_mode;
|
|
hashcpy(b.sha1, b_sha);
|
|
b.mode = b_mode;
|
|
|
|
mfi = merge_file(&o, &a, &b,
|
|
branch1, branch2);
|
|
|
|
if (mfi.clean)
|
|
update_file(1, mfi.sha, mfi.mode, path);
|
|
else {
|
|
clean_merge = 0;
|
|
output("CONFLICT (content): Merge conflict in %s", path);
|
|
|
|
if (index_only)
|
|
update_file(0, mfi.sha, mfi.mode, path);
|
|
else
|
|
update_file_flags(mfi.sha, mfi.mode, path,
|
|
0 /* update_cache */, 1 /* update_working_directory */);
|
|
}
|
|
} else
|
|
die("Fatal merge failure, shouldn't happen.");
|
|
|
|
if (cache_dirty)
|
|
flush_cache();
|
|
|
|
return clean_merge;
|
|
}
|
|
|
|
static int merge_trees(struct tree *head,
|
|
struct tree *merge,
|
|
struct tree *common,
|
|
const char *branch1,
|
|
const char *branch2,
|
|
struct tree **result)
|
|
{
|
|
int code, clean;
|
|
if (sha_eq(common->object.sha1, merge->object.sha1)) {
|
|
output("Already uptodate!");
|
|
*result = head;
|
|
return 1;
|
|
}
|
|
|
|
code = git_merge_trees(index_only, common, head, merge);
|
|
|
|
if (code != 0)
|
|
die("merging of trees %s and %s failed",
|
|
sha1_to_hex(head->object.sha1),
|
|
sha1_to_hex(merge->object.sha1));
|
|
|
|
*result = git_write_tree();
|
|
|
|
if (!*result) {
|
|
struct path_list *entries, *re_head, *re_merge;
|
|
int i;
|
|
path_list_clear(¤t_file_set, 1);
|
|
path_list_clear(¤t_directory_set, 1);
|
|
get_files_dirs(head);
|
|
get_files_dirs(merge);
|
|
|
|
entries = get_unmerged();
|
|
re_head = get_renames(head, common, head, merge, entries);
|
|
re_merge = get_renames(merge, common, head, merge, entries);
|
|
clean = process_renames(re_head, re_merge,
|
|
branch1, branch2);
|
|
for (i = 0; i < entries->nr; i++) {
|
|
const char *path = entries->items[i].path;
|
|
struct stage_data *e = entries->items[i].util;
|
|
if (e->processed)
|
|
continue;
|
|
if (!process_entry(path, e, branch1, branch2))
|
|
clean = 0;
|
|
}
|
|
|
|
path_list_clear(re_merge, 0);
|
|
path_list_clear(re_head, 0);
|
|
path_list_clear(entries, 1);
|
|
|
|
if (clean || index_only)
|
|
*result = git_write_tree();
|
|
else
|
|
*result = NULL;
|
|
} else {
|
|
clean = 1;
|
|
printf("merging of trees %s and %s resulted in %s\n",
|
|
sha1_to_hex(head->object.sha1),
|
|
sha1_to_hex(merge->object.sha1),
|
|
sha1_to_hex((*result)->object.sha1));
|
|
}
|
|
|
|
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 cleaness of the merge.
|
|
*/
|
|
static int merge(struct commit *h1,
|
|
struct commit *h2,
|
|
const char *branch1,
|
|
const char *branch2,
|
|
int call_depth /* =0 */,
|
|
struct commit *ancestor /* =None */,
|
|
struct commit **result)
|
|
{
|
|
struct commit_list *ca = NULL, *iter;
|
|
struct commit *merged_common_ancestors;
|
|
struct tree *mrtree;
|
|
int clean;
|
|
|
|
output("Merging:");
|
|
output_commit_title(h1);
|
|
output_commit_title(h2);
|
|
|
|
if (ancestor)
|
|
commit_list_insert(ancestor, &ca);
|
|
else
|
|
ca = reverse_commit_list(get_merge_bases(h1, h2, 1));
|
|
|
|
output("found %u common ancestor(s):", commit_list_count(ca));
|
|
for (iter = ca; iter; iter = iter->next)
|
|
output_commit_title(iter->item);
|
|
|
|
merged_common_ancestors = pop_commit(&ca);
|
|
if (merged_common_ancestors == NULL) {
|
|
/* if there is no common ancestor, make an empty tree */
|
|
struct tree *tree = xcalloc(1, sizeof(struct tree));
|
|
|
|
tree->object.parsed = 1;
|
|
tree->object.type = OBJ_TREE;
|
|
hash_sha1_file(NULL, 0, tree_type, tree->object.sha1);
|
|
merged_common_ancestors = make_virtual_commit(tree, "ancestor");
|
|
}
|
|
|
|
for (iter = ca; iter; iter = iter->next) {
|
|
output_indent = call_depth + 1;
|
|
/*
|
|
* When the merge fails, the result contains files
|
|
* with conflict markers. The cleanness flag is
|
|
* ignored, it was never acutally used, as result of
|
|
* merge_trees has always overwritten it: the commited
|
|
* "conflicts" were already resolved.
|
|
*/
|
|
merge(merged_common_ancestors, iter->item,
|
|
"Temporary merge branch 1",
|
|
"Temporary merge branch 2",
|
|
call_depth + 1,
|
|
NULL,
|
|
&merged_common_ancestors);
|
|
output_indent = call_depth;
|
|
|
|
if (!merged_common_ancestors)
|
|
die("merge returned no commit");
|
|
}
|
|
|
|
if (call_depth == 0) {
|
|
setup_index(0 /* $GIT_DIR/index */);
|
|
index_only = 0;
|
|
} else {
|
|
setup_index(1 /* temporary index */);
|
|
git_read_tree(h1->tree);
|
|
index_only = 1;
|
|
}
|
|
|
|
clean = merge_trees(h1->tree, h2->tree, merged_common_ancestors->tree,
|
|
branch1, branch2, &mrtree);
|
|
|
|
if (!ancestor && (clean || index_only)) {
|
|
*result = make_virtual_commit(mrtree, "merged tree");
|
|
commit_list_insert(h1, &(*result)->parents);
|
|
commit_list_insert(h2, &(*result)->parents->next);
|
|
} else
|
|
*result = NULL;
|
|
|
|
return clean;
|
|
}
|
|
|
|
static struct commit *get_ref(const char *ref)
|
|
{
|
|
unsigned char sha1[20];
|
|
struct object *object;
|
|
|
|
if (get_sha1(ref, sha1))
|
|
die("Could not resolve ref '%s'", ref);
|
|
object = deref_tag(parse_object(sha1), ref, strlen(ref));
|
|
if (object->type != OBJ_COMMIT)
|
|
return NULL;
|
|
if (parse_commit((struct commit *)object))
|
|
die("Could not parse commit '%s'", sha1_to_hex(object->sha1));
|
|
return (struct commit *)object;
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
static const char *bases[2];
|
|
static unsigned bases_count = 0;
|
|
int i, clean;
|
|
const char *branch1, *branch2;
|
|
struct commit *result, *h1, *h2;
|
|
|
|
git_config(git_default_config); /* core.filemode */
|
|
original_index_file = getenv("GIT_INDEX_FILE");
|
|
|
|
if (!original_index_file)
|
|
original_index_file = xstrdup(git_path("index"));
|
|
|
|
temporary_index_file = xstrdup(git_path("mrg-rcrsv-tmp-idx"));
|
|
|
|
if (argc < 4)
|
|
die("Usage: %s <base>... -- <head> <remote> ...\n", argv[0]);
|
|
|
|
for (i = 1; i < argc; ++i) {
|
|
if (!strcmp(argv[i], "--"))
|
|
break;
|
|
if (bases_count < sizeof(bases)/sizeof(*bases))
|
|
bases[bases_count++] = argv[i];
|
|
}
|
|
if (argc - i != 3) /* "--" "<head>" "<remote>" */
|
|
die("Not handling anything other than two heads merge.");
|
|
|
|
branch1 = argv[++i];
|
|
branch2 = argv[++i];
|
|
printf("Merging %s with %s\n", branch1, branch2);
|
|
|
|
h1 = get_ref(branch1);
|
|
h2 = get_ref(branch2);
|
|
|
|
if (bases_count == 1) {
|
|
struct commit *ancestor = get_ref(bases[0]);
|
|
clean = merge(h1, h2, branch1, branch2, 0, ancestor, &result);
|
|
} else
|
|
clean = merge(h1, h2, branch1, branch2, 0, NULL, &result);
|
|
|
|
if (cache_dirty)
|
|
flush_cache();
|
|
|
|
return clean ? 0: 1;
|
|
}
|
|
|
|
/*
|
|
vim: sw=8 noet
|
|
*/
|