#include "cache.h"
-#include "diff.h"
+#include "tree-walk.h"
+#include "xdiff-interface.h"
+#include "blob.h"
static const char merge_tree_usage[] = "git-merge-tree <base-tree> <branch1> <branch2>";
static int resolve_directories = 1;
+struct merge_list {
+ struct merge_list *next;
+ struct merge_list *link; /* other stages for this object */
+
+ unsigned int stage : 2,
+ flags : 30;
+ unsigned int mode;
+ const char *path;
+ struct blob *blob;
+};
+
+static struct merge_list *merge_result, **merge_result_end = &merge_result;
+
+static void add_merge_entry(struct merge_list *entry)
+{
+ *merge_result_end = entry;
+ merge_result_end = &entry->next;
+}
+
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)
+static const char *explanation(struct merge_list *entry)
+{
+ switch (entry->stage) {
+ case 0:
+ return "merged";
+ case 3:
+ return "added in remote";
+ case 2:
+ if (entry->link)
+ return "added in both";
+ return "added in local";
+ }
+
+ /* Existed in base */
+ entry = entry->link;
+ if (!entry)
+ return "removed in both";
+
+ if (entry->link)
+ return "changed in both";
+
+ if (entry->stage == 3)
+ return "removed in local";
+ return "removed in remote";
+}
+
+extern void *merge_file(struct blob *, struct blob *, struct blob *, unsigned long *);
+
+static void *result(struct merge_list *entry, unsigned long *size)
{
- unsigned long size = 0;
- void *buf = NULL;
+ char type[20];
+ struct blob *base, *our, *their;
- if (sha1) {
- buf = read_object_with_reference(sha1, "tree", &size, NULL);
- if (!buf)
- die("unable to read tree %s", sha1_to_hex(sha1));
+ if (!entry->stage)
+ return read_sha1_file(entry->blob->object.sha1, type, size);
+ base = NULL;
+ if (entry->stage == 1) {
+ base = entry->blob;
+ entry = entry->link;
}
- desc->size = size;
- desc->buf = buf;
- return buf;
+ our = NULL;
+ if (entry && entry->stage == 2) {
+ our = entry->blob;
+ entry = entry->link;
+ }
+ their = NULL;
+ if (entry)
+ their = entry->blob;
+ return merge_file(base, our, their, size);
}
-struct name_entry {
- const unsigned char *sha1;
- const char *path;
- unsigned int mode;
- int pathlen;
-};
+static void *origin(struct merge_list *entry, unsigned long *size)
+{
+ char type[20];
+ while (entry) {
+ if (entry->stage == 2)
+ return read_sha1_file(entry->blob->object.sha1, type, size);
+ entry = entry->link;
+ }
+ return NULL;
+}
-static void entry_clear(struct name_entry *a)
+static int show_outf(void *priv_, mmbuffer_t *mb, int nbuf)
{
- memset(a, 0, sizeof(*a));
+ int i;
+ for (i = 0; i < nbuf; i++)
+ printf("%.*s", (int) mb[i].size, mb[i].ptr);
+ return 0;
+}
+
+static void show_diff(struct merge_list *entry)
+{
+ unsigned long size;
+ mmfile_t src, dst;
+ xpparam_t xpp;
+ xdemitconf_t xecfg;
+ xdemitcb_t ecb;
+
+ xpp.flags = XDF_NEED_MINIMAL;
+ xecfg.ctxlen = 3;
+ xecfg.flags = 0;
+ ecb.outf = show_outf;
+ ecb.priv = NULL;
+
+ src.ptr = origin(entry, &size);
+ if (!src.ptr)
+ size = 0;
+ src.size = size;
+ dst.ptr = result(entry, &size);
+ if (!dst.ptr)
+ size = 0;
+ dst.size = size;
+ xdl_diff(&src, &dst, &xpp, &xecfg, &ecb);
+ free(src.ptr);
+ free(dst.ptr);
}
-static int entry_compare(struct name_entry *a, struct name_entry *b)
+static void show_result_list(struct merge_list *entry)
{
- return base_name_compare(
- a->path, a->pathlen, a->mode,
- b->path, b->pathlen, b->mode);
+ printf("%s\n", explanation(entry));
+ do {
+ struct merge_list *link = entry->link;
+ static const char *desc[4] = { "result", "base", "our", "their" };
+ printf(" %-6s %o %s %s\n", desc[entry->stage], entry->mode, sha1_to_hex(entry->blob->object.sha1), entry->path);
+ entry = link;
+ } while (entry);
}
-static void entry_extract(struct tree_desc *t, struct name_entry *a)
+static void show_result(void)
{
- a->sha1 = tree_entry_extract(t, &a->path, &a->mode);
- a->pathlen = strlen(a->path);
+ struct merge_list *walk;
+
+ walk = merge_result;
+ while (walk) {
+ show_result_list(walk);
+ show_diff(walk);
+ walk = walk->next;
+ }
}
/* An empty entry never compares same, not even to another empty entry */
{
return a->sha1 &&
b->sha1 &&
- !memcmp(a->sha1, b->sha1, 20) &&
+ !hashcmp(a->sha1, b->sha1) &&
a->mode == b->mode;
}
-static void resolve(const char *base, struct name_entry *result)
+static struct merge_list *create_entry(unsigned stage, unsigned mode, const unsigned char *sha1, const char *path)
{
- printf("0 %06o %s %s%s\n", result->mode, sha1_to_hex(result->sha1), base, result->path);
+ struct merge_list *res = xmalloc(sizeof(*res));
+
+ memset(res, 0, sizeof(*res));
+ res->stage = stage;
+ res->path = path;
+ res->mode = mode;
+ res->blob = lookup_blob(sha1);
+ return res;
+}
+
+static void resolve(const char *base, struct name_entry *branch1, struct name_entry *result)
+{
+ struct merge_list *orig, *final;
+ const char *path;
+
+ /* If it's already branch1, don't bother showing it */
+ if (!branch1)
+ return;
+
+ path = xstrdup(mkpath("%s%s", base, result->path));
+ orig = create_entry(2, branch1->mode, branch1->sha1, path);
+ final = create_entry(0, result->mode, result->sha1, path);
+
+ final->link = orig;
+
+ add_merge_entry(final);
}
static int unresolved_directory(const char *base, struct name_entry n[3])
return 1;
}
+
+static struct merge_list *link_entry(unsigned stage, const char *base, struct name_entry *n, struct merge_list *entry)
+{
+ const char *path;
+ struct merge_list *link;
+
+ if (!n->mode)
+ return entry;
+ if (entry)
+ path = entry->path;
+ else
+ path = xstrdup(mkpath("%s%s", base, n->path));
+ link = create_entry(stage, n->mode, n->sha1, path);
+ link->link = entry;
+ return link;
+}
+
static void unresolved(const char *base, struct name_entry n[3])
{
+ struct merge_list *entry = NULL;
+
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);
+
+ /*
+ * Do them in reverse order so that the resulting link
+ * list has the stages in order - link_entry adds new
+ * links at the front.
+ */
+ entry = link_entry(3, base, n + 2, entry);
+ entry = link_entry(2, base, n + 1, entry);
+ entry = link_entry(1, base, n + 0, entry);
+
+ add_merge_entry(entry);
}
/*
* "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)
struct tree_desc t[3];
void *buf1, *buf2, *buf3;
- if (argc < 4)
+ if (argc != 4)
usage(merge_tree_usage);
+ setup_git_directory();
+
buf1 = get_tree_descriptor(t+0, argv[1]);
buf2 = get_tree_descriptor(t+1, argv[2]);
buf3 = get_tree_descriptor(t+2, argv[3]);
free(buf1);
free(buf2);
free(buf3);
+
+ show_result();
return 0;
}