diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-01-22 05:25:20 +0300 |
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committer | Junio C Hamano <gitster@pobox.com> | 2010-01-22 07:06:58 +0300 |
commit | 907a7cb51c6c44d25f4c734a46d5174363190a84 (patch) | |
tree | 437762890f02ae63b73763aa666117b6882ee068 /merge-tree.c | |
parent | a5031214c4fe5f5d3fcf649d10769744cbc66fed (diff) |
make "git merge-tree" a built-in
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'merge-tree.c')
-rw-r--r-- | merge-tree.c | 362 |
1 files changed, 0 insertions, 362 deletions
diff --git a/merge-tree.c b/merge-tree.c deleted file mode 100644 index 37b94d976c..0000000000 --- a/merge-tree.c +++ /dev/null @@ -1,362 +0,0 @@ -#include "cache.h" -#include "tree-walk.h" -#include "xdiff-interface.h" -#include "blob.h" -#include "exec_cmd.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 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(const char *, struct blob *, struct blob *, struct blob *, unsigned long *); - -static void *result(struct merge_list *entry, unsigned long *size) -{ - enum object_type type; - struct blob *base, *our, *their; - - 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; - } - our = NULL; - if (entry && entry->stage == 2) { - our = entry->blob; - entry = entry->link; - } - their = NULL; - if (entry) - their = entry->blob; - return merge_file(entry->path, base, our, their, size); -} - -static void *origin(struct merge_list *entry, unsigned long *size) -{ - enum object_type type; - while (entry) { - if (entry->stage == 2) - return read_sha1_file(entry->blob->object.sha1, &type, size); - entry = entry->link; - } - return NULL; -} - -static int show_outf(void *priv_, mmbuffer_t *mb, int nbuf) -{ - 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; - memset(&xecfg, 0, sizeof(xecfg)); - xecfg.ctxlen = 3; - 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; - xdi_diff(&src, &dst, &xpp, &xecfg, &ecb); - free(src.ptr); - free(dst.ptr); -} - -static void show_result_list(struct merge_list *entry) -{ - 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 show_result(void) -{ - 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 */ -static int same_entry(struct name_entry *a, struct name_entry *b) -{ - return a->sha1 && - b->sha1 && - !hashcmp(a->sha1, b->sha1) && - a->mode == b->mode; -} - -static struct merge_list *create_entry(unsigned stage, unsigned mode, const unsigned char *sha1, const char *path) -{ - struct merge_list *res = xcalloc(1, sizeof(*res)); - - res->stage = stage; - res->path = path; - res->mode = mode; - res->blob = lookup_blob(sha1); - return res; -} - -static char *traverse_path(const struct traverse_info *info, const struct name_entry *n) -{ - char *path = xmalloc(traverse_path_len(info, n) + 1); - return make_traverse_path(path, info, n); -} - -static void resolve(const struct traverse_info *info, 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 = traverse_path(info, result); - 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 struct traverse_info *info, struct name_entry n[3]) -{ - char *newbase; - struct name_entry *p; - struct tree_desc t[3]; - void *buf0, *buf1, *buf2; - - if (!resolve_directories) - return 0; - p = n; - if (!p->mode) { - p++; - if (!p->mode) - p++; - } - if (!S_ISDIR(p->mode)) - return 0; - newbase = traverse_path(info, p); - buf0 = fill_tree_descriptor(t+0, n[0].sha1); - buf1 = fill_tree_descriptor(t+1, n[1].sha1); - buf2 = fill_tree_descriptor(t+2, n[2].sha1); - merge_trees(t, newbase); - - free(buf0); - free(buf1); - free(buf2); - free(newbase); - return 1; -} - - -static struct merge_list *link_entry(unsigned stage, const struct traverse_info *info, 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 = traverse_path(info, n); - link = create_entry(stage, n->mode, n->sha1, path); - link->link = entry; - return link; -} - -static void unresolved(const struct traverse_info *info, struct name_entry n[3]) -{ - struct merge_list *entry = NULL; - - if (unresolved_directory(info, n)) - return; - - /* - * 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, info, n + 2, entry); - entry = link_entry(2, info, n + 1, entry); - entry = link_entry(1, info, n + 0, entry); - - add_merge_entry(entry); -} - -/* - * Merge two trees together (t[1] and t[2]), using a common base (t[0]) - * as the origin. - * - * This walks the (sorted) trees in lock-step, checking every possible - * name. Note that directories automatically sort differently from other - * files (see "base_name_compare"), so you'll never see file/directory - * conflicts, because they won't ever compare the same. - * - * IOW, if a directory changes to a filename, it will automatically be - * seen as the directory going away, and the filename being created. - * - * Think of this as a three-way diff. - * - * The output will be either: - * - successful merge - * "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" - * "3 mode sha1 filename" - * where not all of the 1/2/3 lines may exist, of course. - * - * The successful merge rules are the same as for the three-way merge - * in git-read-tree. - */ -static int threeway_callback(int n, unsigned long mask, unsigned long dirmask, struct name_entry *entry, struct traverse_info *info) -{ - /* Same in both? */ - if (same_entry(entry+1, entry+2)) { - if (entry[0].sha1) { - resolve(info, NULL, entry+1); - return mask; - } - } - - if (same_entry(entry+0, entry+1)) { - if (entry[2].sha1 && !S_ISDIR(entry[2].mode)) { - resolve(info, entry+1, entry+2); - return mask; - } - } - - if (same_entry(entry+0, entry+2)) { - if (entry[1].sha1 && !S_ISDIR(entry[1].mode)) { - resolve(info, NULL, entry+1); - return mask; - } - } - - unresolved(info, entry); - return mask; -} - -static void merge_trees(struct tree_desc t[3], const char *base) -{ - struct traverse_info info; - - setup_traverse_info(&info, base); - info.fn = threeway_callback; - traverse_trees(3, t, &info); -} - -static void *get_tree_descriptor(struct tree_desc *desc, const char *rev) -{ - unsigned char sha1[20]; - void *buf; - - if (get_sha1(rev, sha1)) - die("unknown rev %s", rev); - buf = fill_tree_descriptor(desc, sha1); - if (!buf) - die("%s is not a tree", rev); - return buf; -} - -int main(int argc, char **argv) -{ - struct tree_desc t[3]; - void *buf1, *buf2, *buf3; - - if (argc != 4) - usage(merge_tree_usage); - - git_extract_argv0_path(argv[0]); - - 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]); - merge_trees(t, ""); - free(buf1); - free(buf2); - free(buf3); - - show_result(); - return 0; -} |