*
* Copyright (C) Linus Torvalds, 2005
*/
+#define DBRT_DEBUG 1
+
#include "cache.h"
#include "object.h"
static int merge = 0;
static int update = 0;
+static int index_only = 0;
+static int nontrivial_merge = 0;
+static int trivial_merges_only = 0;
+static int aggressive = 0;
static int head_idx = -1;
static int merge_size = 0;
return ret;
}
-#define DBRT_DEBUG 0
-
static int unpack_trees_rec(struct tree_entry_list **posns, int len,
const char *base, merge_fn_t fn, int *indpos)
{
}
}
-#if DBRT_DEBUG
+#if DBRT_DEBUG > 1
if (first)
printf("index %s\n", first);
#endif
for (i = 0; i < len; i++) {
if (!posns[i] || posns[i] == &df_conflict_list)
continue;
-#if DBRT_DEBUG
+#if DBRT_DEBUG > 1
printf("%d %s\n", i + 1, posns[i]->name);
#endif
if (!first || entcmp(first, firstdir,
if (merge) {
int ret;
-#if DBRT_DEBUG
+#if DBRT_DEBUG > 1
printf("%s:\n", first);
for (i = 0; i < src_size; i++) {
printf(" %d ", i);
#endif
ret = fn(src);
-#if DBRT_DEBUG
+#if DBRT_DEBUG > 1
printf("Added %d entries\n", ret);
#endif
*indpos += ret;
if (unpack_trees_rec(subposns, len, newbase, fn,
indpos))
return -1;
+ free(newbase);
}
free(subposns);
free(src);
ce->name);
}
+/* Unlink the last component and attempt to remove leading
+ * directories, in case this unlink is the removal of the
+ * last entry in the directory -- empty directories are removed.
+ */
+static void unlink_entry(char *name)
+{
+ char *cp, *prev;
+
+ if (unlink(name))
+ return;
+ prev = NULL;
+ while (1) {
+ int status;
+ cp = strrchr(name, '/');
+ if (prev)
+ *prev = '/';
+ if (!cp)
+ break;
+
+ *cp = 0;
+ status = rmdir(name);
+ if (status) {
+ *cp = '/';
+ break;
+ }
+ prev = cp;
+ }
+}
+
static void check_updates(struct cache_entry **src, int nr)
{
static struct checkout state = {
struct cache_entry *ce = *src++;
if (!ce->ce_mode) {
if (update)
- unlink(ce->name);
+ unlink_entry(ce->name);
continue;
}
if (ce->ce_flags & mask) {
{
int indpos = 0;
unsigned len = object_list_length(trees);
- struct tree_entry_list **posns =
- xmalloc(len * sizeof(struct tree_entry_list *));
+ struct tree_entry_list **posns;
int i;
struct object_list *posn = trees;
merge_size = len;
- for (i = 0; i < len; i++) {
- posns[i] = ((struct tree *) posn->item)->entries;
- posn = posn->next;
+
+ if (len) {
+ posns = xmalloc(len * sizeof(struct tree_entry_list *));
+ for (i = 0; i < len; i++) {
+ posns[i] = ((struct tree *) posn->item)->entries;
+ posn = posn->next;
+ }
+ if (unpack_trees_rec(posns, len, "", fn, &indpos))
+ return -1;
}
- if (unpack_trees_rec(posns, len, "", fn, &indpos))
- return -1;
+
+ if (trivial_merges_only && nontrivial_merge)
+ die("Merge requires file-level merging");
check_updates(active_cache, active_nr);
return 0;
{
struct stat st;
+ if (index_only)
+ return;
+
if (!lstat(ce->name, &st)) {
- unsigned changed = ce_match_stat(ce, &st);
+ unsigned changed = ce_match_stat(ce, &st, 1);
if (!changed)
return;
errno = 0;
return 1;
}
+#if DBRT_DEBUG
+static void show_stage_entry(FILE *o,
+ const char *label, const struct cache_entry *ce)
+{
+ if (!ce)
+ fprintf(o, "%s (missing)\n", label);
+ else
+ fprintf(o, "%s%06o %s %d\t%s\n",
+ label,
+ ntohl(ce->ce_mode),
+ sha1_to_hex(ce->sha1),
+ ce_stage(ce),
+ ce->name);
+}
+#endif
+
static int threeway_merge(struct cache_entry **stages)
{
struct cache_entry *index;
int df_conflict_remote = 0;
int any_anc_missing = 0;
+ int no_anc_exists = 1;
int i;
for (i = 1; i < head_idx; i++) {
if (!stages[i])
any_anc_missing = 1;
+ else
+ no_anc_exists = 0;
}
index = stages[0];
if (!same(remote, head)) {
for (i = 1; i < head_idx; i++) {
if (same(stages[i], head)) {
- head_match = 1;
+ head_match = i;
}
if (same(stages[i], remote)) {
- remote_match = 1;
+ remote_match = i;
}
}
}
if (!head && !remote && any_anc_missing)
return 0;
+ /* Under the new "aggressive" rule, we resolve mostly trivial
+ * cases that we historically had git-merge-one-file resolve.
+ */
+ if (aggressive) {
+ int head_deleted = !head && !df_conflict_head;
+ int remote_deleted = !remote && !df_conflict_remote;
+ /*
+ * Deleted in both.
+ * Deleted in one and unchanged in the other.
+ */
+ if ((head_deleted && remote_deleted) ||
+ (head_deleted && remote && remote_match) ||
+ (remote_deleted && head && head_match))
+ return 0;
+
+ /*
+ * Added in both, identically.
+ */
+ if (no_anc_exists && head && remote && same(head, remote))
+ return merged_entry(head, index);
+
+ }
+
/* Below are "no merge" cases, which require that the index be
* up-to-date to avoid the files getting overwritten with
* conflict resolution files.
verify_uptodate(index);
}
+ nontrivial_merge = 1;
+
/* #2, #3, #4, #6, #7, #9, #11. */
count = 0;
if (!head_match || !remote_match) {
}
}
}
+#if DBRT_DEBUG
+ else {
+ fprintf(stderr, "read-tree: warning #16 detected\n");
+ show_stage_entry(stderr, "head ", stages[head_match]);
+ show_stage_entry(stderr, "remote ", stages[remote_match]);
+ }
+#endif
if (head) { count += keep_entry(head); }
if (remote) { count += keep_entry(remote); }
return count;
return deleted;
}
-static const char read_tree_usage[] = "git-read-tree (<sha> | -m [-u] <sha1> [<sha2> [<sha3>]])";
+static const char read_tree_usage[] = "git-read-tree (<sha> | -m [-u | -i] <sha1> [<sha2> [<sha3>]])";
static struct cache_file cache_file;
unsigned char sha1[20];
merge_fn_t fn = NULL;
+ setup_git_directory();
+
newfd = hold_index_file_for_update(&cache_file, get_index_file());
if (newfd < 0)
die("unable to create new cachefile");
+ git_config(git_default_config);
+
merge = 0;
reset = 0;
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
- /* "-u" means "update", meaning that a merge will update the working directory */
+ /* "-u" means "update", meaning that a merge will update
+ * the working tree.
+ */
if (!strcmp(arg, "-u")) {
update = 1;
continue;
}
+ /* "-i" means "index only", meaning that a merge will
+ * not even look at the working tree.
+ */
+ if (!strcmp(arg, "-i")) {
+ index_only = 1;
+ continue;
+ }
+
/* This differs from "-m" in that we'll silently ignore unmerged entries */
if (!strcmp(arg, "--reset")) {
if (stage || merge)
continue;
}
- if (!strcmp(arg, "--head")) {
- head_idx = stage - 1;
- fn = threeway_merge;
+ if (!strcmp(arg, "--trivial")) {
+ trivial_merges_only = 1;
+ continue;
+ }
+
+ if (!strcmp(arg, "--aggressive")) {
+ aggressive = 1;
+ continue;
}
/* "-m" stands for "merge", meaning we start in stage 1 */
continue;
}
+ /* using -u and -i at the same time makes no sense */
+ if (1 < index_only + update)
+ usage(read_tree_usage);
+
if (get_sha1(arg, sha1) < 0)
usage(read_tree_usage);
if (list_tree(sha1) < 0)
die("failed to unpack tree object %s", arg);
stage++;
}
- if (update && !merge)
+ if ((update||index_only) && !merge)
usage(read_tree_usage);
- if (merge && !fn) {
+
+ if (merge) {
if (stage < 2)
die("just how do you expect me to merge %d trees?", stage-1);
switch (stage - 1) {
fn = threeway_merge;
break;
}
- }
- if (head_idx < 0) {
if (stage - 1 >= 3)
head_idx = stage - 2;
else