#include "cache.h"
-#include "diff.h"
+#include "tree-walk.h"
static const char merge_tree_usage[] = "git-merge-tree <base-tree> <branch1> <branch2>";
static int resolve_directories = 1;
static void merge_trees(struct tree_desc t[3], const char *base);
-static void *fill_tree_descriptor(struct tree_desc *desc, const unsigned char *sha1)
-{
- unsigned long size = 0;
- void *buf = NULL;
-
- if (sha1) {
- buf = read_object_with_reference(sha1, "tree", &size, NULL);
- if (!buf)
- die("unable to read tree %s", sha1_to_hex(sha1));
- }
- desc->size = size;
- desc->buf = buf;
- return buf;
-}
-
-struct name_entry {
- const unsigned char *sha1;
- const char *path;
- unsigned int mode;
- int pathlen;
-};
-
-static void entry_clear(struct name_entry *a)
-{
- memset(a, 0, sizeof(*a));
-}
-
-static int entry_compare(struct name_entry *a, struct name_entry *b)
-{
- return base_name_compare(
- a->path, a->pathlen, a->mode,
- b->path, b->pathlen, b->mode);
-}
-
-static void entry_extract(struct tree_desc *t, struct name_entry *a)
-{
- a->sha1 = tree_entry_extract(t, &a->path, &a->mode);
- a->pathlen = strlen(a->path);
-}
-
/* An empty entry never compares same, not even to another empty entry */
static int same_entry(struct name_entry *a, struct name_entry *b)
{
a->mode == b->mode;
}
-static void resolve(const char *base, struct name_entry *result)
+static const char *sha1_to_hex_zero(const unsigned char *sha1)
{
- printf("0 %06o %s %s%s\n", result->mode, sha1_to_hex(result->sha1), base, result->path);
+ if (sha1)
+ return sha1_to_hex(sha1);
+ return "0000000000000000000000000000000000000000";
+}
+
+static void resolve(const char *base, struct name_entry *branch1, struct name_entry *result)
+{
+ /* If it's already branch1, don't bother showing it */
+ if (!branch1)
+ return;
+
+ printf("0 %06o->%06o %s->%s %s%s\n",
+ branch1->mode, result->mode,
+ sha1_to_hex_zero(branch1->sha1),
+ sha1_to_hex_zero(result->sha1),
+ base, result->path);
}
static int unresolved_directory(const char *base, struct name_entry n[3])
{
if (unresolved_directory(base, n))
return;
- printf("1 %06o %s %s%s\n", n[0].mode, sha1_to_hex(n[0].sha1), base, n[0].path);
- printf("2 %06o %s %s%s\n", n[1].mode, sha1_to_hex(n[1].sha1), base, n[1].path);
- printf("3 %06o %s %s%s\n", n[2].mode, sha1_to_hex(n[2].sha1), base, n[2].path);
+ if (n[0].sha1)
+ printf("1 %06o %s %s%s\n", n[0].mode, sha1_to_hex(n[0].sha1), base, n[0].path);
+ if (n[1].sha1)
+ printf("2 %06o %s %s%s\n", n[1].mode, sha1_to_hex(n[1].sha1), base, n[1].path);
+ if (n[2].sha1)
+ printf("3 %06o %s %s%s\n", n[2].mode, sha1_to_hex(n[2].sha1), base, n[2].path);
}
/*
* "0 mode sha1 filename"
* NOTE NOTE NOTE! FIXME! We really really need to walk the index
* in parallel with this too!
- *
+ *
* - conflict:
* "1 mode sha1 filename"
* "2 mode sha1 filename"
* The successful merge rules are the same as for the three-way merge
* in git-read-tree.
*/
-static void merge_trees(struct tree_desc t[3], const char *base)
+static void threeway_callback(int n, unsigned long mask, struct name_entry *entry, const char *base)
{
- for (;;) {
- struct name_entry entry[3];
- unsigned int mask = 0;
- int i, last;
-
- last = -1;
- for (i = 0; i < 3; i++) {
- if (!t[i].size)
- continue;
- entry_extract(t+i, entry+i);
- if (last >= 0) {
- int cmp = entry_compare(entry+i, entry+last);
-
- /*
- * Is the new name bigger than the old one?
- * Ignore it
- */
- if (cmp > 0)
- continue;
- /*
- * Is the new name smaller than the old one?
- * Ignore all old ones
- */
- if (cmp < 0)
- mask = 0;
- }
- mask |= 1u << i;
- last = i;
- }
- if (!mask)
- break;
-
- /*
- * Update the tree entries we've walked, and clear
- * all the unused name-entries.
- */
- for (i = 0; i < 3; i++) {
- if (mask & (1u << i)) {
- update_tree_entry(t+i);
- continue;
- }
- entry_clear(entry + i);
+ /* Same in both? */
+ if (same_entry(entry+1, entry+2)) {
+ if (entry[0].sha1) {
+ resolve(base, NULL, entry+1);
+ return;
}
+ }
- /* Same in both? */
- if (same_entry(entry+1, entry+2)) {
- if (entry[0].sha1) {
- resolve(base, entry+1);
- continue;
- }
+ if (same_entry(entry+0, entry+1)) {
+ if (entry[2].sha1 && !S_ISDIR(entry[2].mode)) {
+ resolve(base, entry+1, entry+2);
+ return;
}
+ }
- if (same_entry(entry+0, entry+1)) {
- if (entry[2].sha1) {
- resolve(base, entry+2);
- continue;
- }
+ if (same_entry(entry+0, entry+2)) {
+ if (entry[1].sha1 && !S_ISDIR(entry[1].mode)) {
+ resolve(base, NULL, entry+1);
+ return;
}
+ }
- if (same_entry(entry+0, entry+2)) {
- if (entry[1].sha1) {
- resolve(base, entry+1);
- continue;
- }
- }
+ unresolved(base, entry);
+}
- unresolved(base, entry);
- }
+static void merge_trees(struct tree_desc t[3], const char *base)
+{
+ traverse_trees(3, t, base, threeway_callback);
}
static void *get_tree_descriptor(struct tree_desc *desc, const char *rev)
unsigned char sha1[20];
void *buf;
- if (get_sha1(rev, sha1) < 0)
+ if (get_sha1(rev, sha1))
die("unknown rev %s", rev);
buf = fill_tree_descriptor(desc, sha1);
if (!buf)