diff options
| -rw-r--r-- | .gitignore | 2 | ||||
| -rw-r--r-- | Makefile | 10 | ||||
| -rw-r--r-- | cache.h | 3 | ||||
| -rwxr-xr-x | git-merge.sh | 4 | ||||
| -rw-r--r-- | match-trees.c | 304 | ||||
| -rw-r--r-- | merge-recursive.c | 29 | ||||
| -rw-r--r-- | test-match-trees.c | 24 |
7 files changed, 373 insertions, 3 deletions
diff --git a/.gitignore b/.gitignore index b39f78fcd..9229e918c 100644 --- a/.gitignore +++ b/.gitignore @@ -77,6 +77,7 @@ git-merge-ours git-merge-recursive git-merge-resolve git-merge-stupid +git-merge-subtree git-mergetool git-mktag git-mktree @@ -148,6 +149,7 @@ test-chmtime test-date test-delta test-dump-cache-tree +test-match-trees common-cmds.h *.tar.gz *.dsc @@ -251,6 +251,8 @@ BUILT_INS = \ # what 'all' will build and 'install' will install, in gitexecdir ALL_PROGRAMS = $(PROGRAMS) $(SCRIPTS) +ALL_PROGRAMS += git-merge-subtree$X + # what 'all' will build but not install in gitexecdir OTHER_PROGRAMS = git$X gitweb/gitweb.cgi ifndef NO_TCLTK @@ -299,7 +301,7 @@ LIB_OBJS = \ server-info.o setup.o sha1_file.o sha1_name.o strbuf.o \ tag.o tree.o usage.o config.o environment.o ctype.o copy.o \ revision.o pager.o tree-walk.o xdiff-interface.o \ - write_or_die.o trace.o list-objects.o grep.o \ + write_or_die.o trace.o list-objects.o grep.o match-trees.o \ alloc.o merge-file.o path-list.o help.o unpack-trees.o $(DIFF_OBJS) \ color.o wt-status.o archive-zip.o archive-tar.o shallow.o utf8.o \ convert.o @@ -725,6 +727,9 @@ git$X: git.c common-cmds.h $(BUILTIN_OBJS) $(GITLIBS) GIT-CFLAGS help.o: common-cmds.h +git-merge-subtree$X: git-merge-recursive$X + rm -f $@ && ln git-merge-recursive$X $@ + $(BUILT_INS): git$X $(QUIET_BUILT_IN)rm -f $@ && ln git$X $@ @@ -942,6 +947,9 @@ test-dump-cache-tree$X: dump-cache-tree.o $(GITLIBS) test-sha1$X: test-sha1.o $(GITLIBS) $(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS) +test-match-trees$X: test-match-trees.o $(GITLIBS) + $(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS) + test-chmtime$X: test-chmtime.c $(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $< @@ -496,4 +496,7 @@ extern void trace_argv_printf(const char **argv, int count, const char *format, extern int convert_to_git(const char *path, char **bufp, unsigned long *sizep); extern int convert_to_working_tree(const char *path, char **bufp, unsigned long *sizep); +/* match-trees.c */ +void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int); + #endif /* CACHE_H */ diff --git a/git-merge.sh b/git-merge.sh index fa4589173..7ebbce4bd 100755 --- a/git-merge.sh +++ b/git-merge.sh @@ -16,10 +16,10 @@ test -z "$(git ls-files -u)" || LF=' ' -all_strategies='recur recursive octopus resolve stupid ours' +all_strategies='recur recursive octopus resolve stupid ours subtree' default_twohead_strategies='recursive' default_octopus_strategies='octopus' -no_trivial_merge_strategies='ours' +no_trivial_merge_strategies='ours subtree' use_strategies= index_merge=t diff --git a/match-trees.c b/match-trees.c new file mode 100644 index 000000000..23cafe47b --- /dev/null +++ b/match-trees.c @@ -0,0 +1,304 @@ +#include "cache.h" +#include "tree.h" +#include "tree-walk.h" + +static int score_missing(unsigned mode, const char *path) +{ + int score; + + if (S_ISDIR(mode)) + score = -1000; + else if (S_ISLNK(mode)) + score = -500; + else + score = -50; + return score; +} + +static int score_differs(unsigned mode1, unsigned mode2, const char *path) +{ + int score; + + if (S_ISDIR(mode1) != S_ISDIR(mode2)) + score = -100; + else if (S_ISLNK(mode1) != S_ISLNK(mode2)) + score = -50; + else + score = -5; + return score; +} + +static int score_matches(unsigned mode1, unsigned mode2, const char *path) +{ + int score; + + /* Heh, we found SHA-1 collisions between different kind of objects */ + if (S_ISDIR(mode1) != S_ISDIR(mode2)) + score = -100; + else if (S_ISLNK(mode1) != S_ISLNK(mode2)) + score = -50; + + else if (S_ISDIR(mode1)) + score = 1000; + else if (S_ISLNK(mode1)) + score = 500; + else + score = 250; + return score; +} + +/* + * Inspect two trees, and give a score that tells how similar they are. + */ +static int score_trees(const unsigned char *hash1, const unsigned char *hash2) +{ + struct tree_desc one; + struct tree_desc two; + void *one_buf, *two_buf; + int score = 0; + enum object_type type; + unsigned long size; + + one_buf = read_sha1_file(hash1, &type, &size); + if (!one_buf) + die("unable to read tree (%s)", sha1_to_hex(hash1)); + if (type != OBJ_TREE) + die("%s is not a tree", sha1_to_hex(hash1)); + init_tree_desc(&one, one_buf, size); + two_buf = read_sha1_file(hash2, &type, &size); + if (!two_buf) + die("unable to read tree (%s)", sha1_to_hex(hash2)); + if (type != OBJ_TREE) + die("%s is not a tree", sha1_to_hex(hash2)); + init_tree_desc(&two, two_buf, size); + while (one.size | two.size) { + const unsigned char *elem1 = elem1; + const unsigned char *elem2 = elem2; + const char *path1 = path1; + const char *path2 = path2; + unsigned mode1 = mode1; + unsigned mode2 = mode2; + int cmp; + + if (one.size) + elem1 = tree_entry_extract(&one, &path1, &mode1); + if (two.size) + elem2 = tree_entry_extract(&two, &path2, &mode2); + + if (!one.size) { + /* two has more entries */ + score += score_missing(mode2, path2); + update_tree_entry(&two); + continue; + } + if (!two.size) { + /* two lacks this entry */ + score += score_missing(mode1, path1); + update_tree_entry(&one); + continue; + } + cmp = base_name_compare(path1, strlen(path1), mode1, + path2, strlen(path2), mode2); + if (cmp < 0) { + /* path1 does not appear in two */ + score += score_missing(mode1, path1); + update_tree_entry(&one); + continue; + } + else if (cmp > 0) { + /* path2 does not appear in one */ + score += score_missing(mode2, path2); + update_tree_entry(&two); + continue; + } + else if (hashcmp(elem1, elem2)) + /* they are different */ + score += score_differs(mode1, mode2, path1); + else + /* same subtree or blob */ + score += score_matches(mode1, mode2, path1); + update_tree_entry(&one); + update_tree_entry(&two); + } + free(one_buf); + free(two_buf); + return score; +} + +/* + * Match one itself and its subtrees with two and pick the best match. + */ +static void match_trees(const unsigned char *hash1, + const unsigned char *hash2, + int *best_score, + char **best_match, + char *base, + int recurse_limit) +{ + struct tree_desc one; + void *one_buf; + enum object_type type; + unsigned long size; + + one_buf = read_sha1_file(hash1, &type, &size); + if (!one_buf) + die("unable to read tree (%s)", sha1_to_hex(hash1)); + if (type != OBJ_TREE) + die("%s is not a tree", sha1_to_hex(hash1)); + init_tree_desc(&one, one_buf, size); + + while (one.size) { + const char *path; + const unsigned char *elem; + unsigned mode; + int score; + + elem = tree_entry_extract(&one, &path, &mode); + if (!S_ISDIR(mode)) + goto next; + score = score_trees(elem, hash2); + if (*best_score < score) { + char *newpath; + newpath = xmalloc(strlen(base) + strlen(path) + 1); + sprintf(newpath, "%s%s", base, path); + free(*best_match); + *best_match = newpath; + *best_score = score; + } + if (recurse_limit) { + char *newbase; + newbase = xmalloc(strlen(base) + strlen(path) + 2); + sprintf(newbase, "%s%s/", base, path); + match_trees(elem, hash2, best_score, best_match, + newbase, recurse_limit - 1); + free(newbase); + } + + next: + update_tree_entry(&one); + } + free(one_buf); +} + +/* + * A tree "hash1" has a subdirectory at "prefix". Come up with a + * tree object by replacing it with another tree "hash2". + */ +static int splice_tree(const unsigned char *hash1, + char *prefix, + const unsigned char *hash2, + unsigned char *result) +{ + char *subpath; + int toplen; + char *buf; + unsigned long sz; + struct tree_desc desc; + unsigned char *rewrite_here; + const unsigned char *rewrite_with; + unsigned char subtree[20]; + enum object_type type; + int status; + + subpath = strchr(prefix, '/'); + if (!subpath) + toplen = strlen(prefix); + else { + toplen = subpath - prefix; + subpath++; + } + + buf = read_sha1_file(hash1, &type, &sz); + if (!buf) + die("cannot read tree %s", sha1_to_hex(hash1)); + init_tree_desc(&desc, buf, sz); + + rewrite_here = NULL; + while (desc.size) { + const char *name; + unsigned mode; + const unsigned char *sha1; + + sha1 = tree_entry_extract(&desc, &name, &mode); + if (strlen(name) == toplen && + !memcmp(name, prefix, toplen)) { + if (!S_ISDIR(mode)) + die("entry %s in tree %s is not a tree", + name, sha1_to_hex(hash1)); + rewrite_here = (unsigned char *) sha1; + break; + } + update_tree_entry(&desc); + } + if (!rewrite_here) + die("entry %.*s not found in tree %s", + toplen, prefix, sha1_to_hex(hash1)); + if (subpath) { + status = splice_tree(rewrite_here, subpath, hash2, subtree); + if (status) + return status; + rewrite_with = subtree; + } + else + rewrite_with = hash2; + hashcpy(rewrite_here, rewrite_with); + status = write_sha1_file(buf, sz, tree_type, result); + free(buf); + return status; +} + +/* + * We are trying to come up with a merge between one and two that + * results in a tree shape similar to one. The tree two might + * correspond to a subtree of one, in which case it needs to be + * shifted down by prefixing otherwise empty directories. On the + * other hand, it could cover tree one and we might need to pick a + * subtree of it. + */ +void shift_tree(const unsigned char *hash1, + const unsigned char *hash2, + unsigned char *shifted, + int depth_limit) +{ + char *add_prefix; + char *del_prefix; + int add_score, del_score; + + add_score = del_score = score_trees(hash1, hash2); + add_prefix = xcalloc(1, 1); + del_prefix = xcalloc(1, 1); + + /* + * See if one's subtree resembles two; if so we need to prefix + * two with a few fake trees to match the prefix. + */ + match_trees(hash1, hash2, &add_score, &add_prefix, "", depth_limit); + + /* + * See if two's subtree resembles one; if so we need to + * pick only subtree of two. + */ + match_trees(hash2, hash1, &del_score, &del_prefix, "", depth_limit); + + /* Assume we do not have to do any shifting */ + hashcpy(shifted, hash2); + + if (add_score < del_score) { + /* We need to pick a subtree of two */ + unsigned mode; + + if (!*del_prefix) + return; + + if (get_tree_entry(hash2, del_prefix, shifted, &mode)) + die("cannot find path %s in tree %s", + del_prefix, sha1_to_hex(hash2)); + return; + } + + if (!*add_prefix) + return; + + splice_tree(hash1, add_prefix, hash2, shifted); +} + diff --git a/merge-recursive.c b/merge-recursive.c index 2b614b64b..3096594b3 100644 --- a/merge-recursive.c +++ b/merge-recursive.c @@ -16,6 +16,22 @@ #include "path-list.h" #include "xdiff-interface.h" +static int subtree_merge; + +static struct tree *shift_tree_object(struct tree *one, struct tree *two) +{ + unsigned char shifted[20]; + + /* + * NEEDSWORK: this limits the recursion depth to hardcoded + * value '2' to avoid excessive overhead. + */ + shift_tree(one->object.sha1, two->object.sha1, shifted, 2); + if (!hashcmp(two->object.sha1, shifted)) + return two; + return lookup_tree(shifted); +} + /* * A virtual commit has * - (const char *)commit->util set to the name, and @@ -1137,6 +1153,12 @@ static int merge_trees(struct tree *head, struct tree **result) { int code, clean; + + if (subtree_merge) { + merge = shift_tree_object(head, merge); + common = shift_tree_object(head, common); + } + if (sha_eq(common->object.sha1, merge->object.sha1)) { output(0, "Already uptodate!"); *result = head; @@ -1342,6 +1364,13 @@ int main(int argc, char *argv[]) struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); int index_fd; + if (argv[0]) { + int namelen = strlen(argv[0]); + if (8 < namelen && + !strcmp(argv[0] + namelen - 8, "-subtree")) + subtree_merge = 1; + } + git_config(merge_config); if (getenv("GIT_MERGE_VERBOSITY")) verbosity = strtol(getenv("GIT_MERGE_VERBOSITY"), NULL, 10); diff --git a/test-match-trees.c b/test-match-trees.c new file mode 100644 index 000000000..a3c468877 --- /dev/null +++ b/test-match-trees.c @@ -0,0 +1,24 @@ +#include "cache.h" +#include "tree.h" + +int main(int ac, char **av) +{ + unsigned char hash1[20], hash2[20], shifted[20]; + struct tree *one, *two; + + if (get_sha1(av[1], hash1)) + die("cannot parse %s as an object name", av[1]); + if (get_sha1(av[2], hash2)) + die("cannot parse %s as an object name", av[2]); + one = parse_tree_indirect(hash1); + if (!one) + die("not a treeish %s", av[1]); + two = parse_tree_indirect(hash2); + if (!two) + die("not a treeish %s", av[2]); + + shift_tree(one->object.sha1, two->object.sha1, shifted, -1); + printf("shifted: %s\n", sha1_to_hex(shifted)); + + exit(0); +} |