#include "tree-walk.h"
#include "diff.h"
#include "revision.h"
+#include "list-objects.h"
#include "builtin.h"
/* bits #0-15 in revision.h */
" --no-merges\n"
" --remove-empty\n"
" --all\n"
+" --stdin\n"
" ordering output:\n"
" --topo-order\n"
" --date-order\n"
" --header | --pretty\n"
" --abbrev=nr | --no-abbrev\n"
" --abbrev-commit\n"
+" --left-right\n"
" special purpose:\n"
-" --bisect"
+" --bisect\n"
+" --bisect-vars"
;
static struct rev_info revs;
fputs(header_prefix, stdout);
if (commit->object.flags & BOUNDARY)
putchar('-');
+ else if (revs.left_right) {
+ if (commit->object.flags & SYMMETRIC_LEFT)
+ putchar('<');
+ else
+ putchar('>');
+ }
if (revs.abbrev_commit && revs.abbrev)
fputs(find_unique_abbrev(commit->object.sha1, revs.abbrev),
stdout);
if (revs.parents) {
struct commit_list *parents = commit->parents;
while (parents) {
- struct object *o = &(parents->item->object);
+ printf(" %s", sha1_to_hex(parents->item->object.sha1));
parents = parents->next;
- if (o->flags & TMP_MARK)
- continue;
- printf(" %s", sha1_to_hex(o->sha1));
- o->flags |= TMP_MARK;
}
- /* TMP_MARK is a general purpose flag that can
- * be used locally, but the user should clean
- * things up after it is done with them.
- */
- for (parents = commit->parents;
- parents;
- parents = parents->next)
- parents->item->object.flags &= ~TMP_MARK;
}
if (revs.commit_format == CMIT_FMT_ONELINE)
putchar(' ');
putchar('\n');
if (revs.verbose_header) {
- static char pretty_header[16384];
- pretty_print_commit(revs.commit_format, commit, ~0,
- pretty_header, sizeof(pretty_header),
- revs.abbrev, NULL, NULL);
- printf("%s%c", pretty_header, hdr_termination);
+ struct strbuf buf;
+ strbuf_init(&buf, 0);
+ pretty_print_commit(revs.commit_format, commit,
+ &buf, revs.abbrev, NULL, NULL, revs.date_mode);
+ if (buf.len)
+ printf("%s%c", buf.buf, hdr_termination);
+ strbuf_release(&buf);
}
- fflush(stdout);
+ maybe_flush_or_die(stdout, "stdout");
if (commit->parents) {
free_commit_list(commit->parents);
commit->parents = NULL;
commit->buffer = NULL;
}
-static void process_blob(struct blob *blob,
- struct object_array *p,
- struct name_path *path,
- const char *name)
+static void show_object(struct object_array_entry *p)
{
- struct object *obj = &blob->object;
-
- if (!revs.blob_objects)
- return;
- if (obj->flags & (UNINTERESTING | SEEN))
- return;
- obj->flags |= SEEN;
- name = strdup(name);
- add_object(obj, p, path, name);
-}
-
-static void process_tree(struct tree *tree,
- struct object_array *p,
- struct name_path *path,
- const char *name)
-{
- struct object *obj = &tree->object;
- struct tree_desc desc;
- struct name_entry entry;
- struct name_path me;
-
- if (!revs.tree_objects)
- return;
- if (obj->flags & (UNINTERESTING | SEEN))
- return;
- if (parse_tree(tree) < 0)
- die("bad tree object %s", sha1_to_hex(obj->sha1));
- obj->flags |= SEEN;
- name = strdup(name);
- add_object(obj, p, path, name);
- me.up = path;
- me.elem = name;
- me.elem_len = strlen(name);
-
- desc.buf = tree->buffer;
- desc.size = tree->size;
-
- while (tree_entry(&desc, &entry)) {
- if (S_ISDIR(entry.mode))
- process_tree(lookup_tree(entry.sha1), p, &me, entry.path);
- else
- process_blob(lookup_blob(entry.sha1), p, &me, entry.path);
+ /* An object with name "foo\n0000000..." can be used to
+ * confuse downstream git-pack-objects very badly.
+ */
+ const char *ep = strchr(p->name, '\n');
+
+ if (p->item->type == OBJ_BLOB && !has_sha1_file(p->item->sha1))
+ die("missing blob object '%s'", sha1_to_hex(p->item->sha1));
+
+ if (ep) {
+ printf("%s %.*s\n", sha1_to_hex(p->item->sha1),
+ (int) (ep - p->name),
+ p->name);
}
- free(tree->buffer);
- tree->buffer = NULL;
+ else
+ printf("%s %s\n", sha1_to_hex(p->item->sha1), p->name);
}
-static void show_commit_list(struct rev_info *revs)
+static void show_edge(struct commit *commit)
{
- int i;
- struct commit *commit;
- struct object_array objects = { 0, 0, NULL };
-
- while ((commit = get_revision(revs)) != NULL) {
- process_tree(commit->tree, &objects, NULL, "");
- show_commit(commit);
- }
- for (i = 0; i < revs->pending.nr; i++) {
- struct object_array_entry *pending = revs->pending.objects + i;
- struct object *obj = pending->item;
- const char *name = pending->name;
- if (obj->flags & (UNINTERESTING | SEEN))
- continue;
- if (obj->type == OBJ_TAG) {
- obj->flags |= SEEN;
- add_object_array(obj, name, &objects);
- continue;
- }
- if (obj->type == OBJ_TREE) {
- process_tree((struct tree *)obj, &objects, NULL, name);
- continue;
- }
- if (obj->type == OBJ_BLOB) {
- process_blob((struct blob *)obj, &objects, NULL, name);
- continue;
- }
- die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
- }
- for (i = 0; i < objects.nr; i++) {
- struct object_array_entry *p = objects.objects + i;
-
- /* An object with name "foo\n0000000..." can be used to
- * confuse downstream git-pack-objects very badly.
- */
- const char *ep = strchr(p->name, '\n');
- if (ep) {
- printf("%s %.*s\n", sha1_to_hex(p->item->sha1),
- (int) (ep - p->name),
- p->name);
- }
- else
- printf("%s %s\n", sha1_to_hex(p->item->sha1), p->name);
- }
+ printf("-%s\n", sha1_to_hex(commit->object.sha1));
}
/*
}
}
-static struct commit_list *find_bisection(struct commit_list *list)
+#define DEBUG_BISECT 0
+
+static inline int weight(struct commit_list *elem)
{
- int nr, closest;
- struct commit_list *p, *best;
+ return *((int*)(elem->item->util));
+}
- nr = 0;
- p = list;
- while (p) {
- if (!revs.prune_fn || (p->item->object.flags & TREECHANGE))
- nr++;
- p = p->next;
+static inline void weight_set(struct commit_list *elem, int weight)
+{
+ *((int*)(elem->item->util)) = weight;
+}
+
+static int count_interesting_parents(struct commit *commit)
+{
+ struct commit_list *p;
+ int count;
+
+ for (count = 0, p = commit->parents; p; p = p->next) {
+ if (p->item->object.flags & UNINTERESTING)
+ continue;
+ count++;
}
- closest = 0;
- best = list;
+ return count;
+}
+
+static inline int halfway(struct commit_list *p, int nr)
+{
+ /*
+ * Don't short-cut something we are not going to return!
+ */
+ if (revs.prune_fn && !(p->item->object.flags & TREECHANGE))
+ return 0;
+ if (DEBUG_BISECT)
+ return 0;
+ /*
+ * 2 and 3 are halfway of 5.
+ * 3 is halfway of 6 but 2 and 4 are not.
+ */
+ switch (2 * weight(p) - nr) {
+ case -1: case 0: case 1:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+#if !DEBUG_BISECT
+#define show_list(a,b,c,d) do { ; } while (0)
+#else
+static void show_list(const char *debug, int counted, int nr,
+ struct commit_list *list)
+{
+ struct commit_list *p;
+
+ fprintf(stderr, "%s (%d/%d)\n", debug, counted, nr);
+ for (p = list; p; p = p->next) {
+ struct commit_list *pp;
+ struct commit *commit = p->item;
+ unsigned flags = commit->object.flags;
+ enum object_type type;
+ unsigned long size;
+ char *buf = read_sha1_file(commit->object.sha1, &type, &size);
+ char *ep, *sp;
+
+ fprintf(stderr, "%c%c%c ",
+ (flags & TREECHANGE) ? 'T' : ' ',
+ (flags & UNINTERESTING) ? 'U' : ' ',
+ (flags & COUNTED) ? 'C' : ' ');
+ if (commit->util)
+ fprintf(stderr, "%3d", weight(p));
+ else
+ fprintf(stderr, "---");
+ fprintf(stderr, " %.*s", 8, sha1_to_hex(commit->object.sha1));
+ for (pp = commit->parents; pp; pp = pp->next)
+ fprintf(stderr, " %.*s", 8,
+ sha1_to_hex(pp->item->object.sha1));
+
+ sp = strstr(buf, "\n\n");
+ if (sp) {
+ sp += 2;
+ for (ep = sp; *ep && *ep != '\n'; ep++)
+ ;
+ fprintf(stderr, " %.*s", (int)(ep - sp), sp);
+ }
+ fprintf(stderr, "\n");
+ }
+}
+#endif /* DEBUG_BISECT */
+
+static struct commit_list *best_bisection(struct commit_list *list, int nr)
+{
+ struct commit_list *p, *best;
+ int best_distance = -1;
+
+ best = list;
for (p = list; p; p = p->next) {
int distance;
+ unsigned flags = p->item->object.flags;
- if (revs.prune_fn && !(p->item->object.flags & TREECHANGE))
+ if (revs.prune_fn && !(flags & TREECHANGE))
continue;
-
- distance = count_distance(p);
- clear_distance(list);
+ distance = weight(p);
if (nr - distance < distance)
distance = nr - distance;
- if (distance > closest) {
+ if (distance > best_distance) {
best = p;
- closest = distance;
+ best_distance = distance;
}
}
- if (best)
- best->next = NULL;
+
return best;
}
-static void mark_edge_parents_uninteresting(struct commit *commit)
+/*
+ * zero or positive weight is the number of interesting commits it can
+ * reach, including itself. Especially, weight = 0 means it does not
+ * reach any tree-changing commits (e.g. just above uninteresting one
+ * but traversal is with pathspec).
+ *
+ * weight = -1 means it has one parent and its distance is yet to
+ * be computed.
+ *
+ * weight = -2 means it has more than one parent and its distance is
+ * unknown. After running count_distance() first, they will get zero
+ * or positive distance.
+ */
+static struct commit_list *do_find_bisection(struct commit_list *list,
+ int nr, int *weights)
{
- struct commit_list *parents;
+ int n, counted;
+ struct commit_list *p;
+
+ counted = 0;
+
+ for (n = 0, p = list; p; p = p->next) {
+ struct commit *commit = p->item;
+ unsigned flags = commit->object.flags;
+
+ p->item->util = &weights[n++];
+ switch (count_interesting_parents(commit)) {
+ case 0:
+ if (!revs.prune_fn || (flags & TREECHANGE)) {
+ weight_set(p, 1);
+ counted++;
+ show_list("bisection 2 count one",
+ counted, nr, list);
+ }
+ /*
+ * otherwise, it is known not to reach any
+ * tree-changing commit and gets weight 0.
+ */
+ break;
+ case 1:
+ weight_set(p, -1);
+ break;
+ default:
+ weight_set(p, -2);
+ break;
+ }
+ }
- for (parents = commit->parents; parents; parents = parents->next) {
- struct commit *parent = parents->item;
- if (!(parent->object.flags & UNINTERESTING))
+ show_list("bisection 2 initialize", counted, nr, list);
+
+ /*
+ * If you have only one parent in the resulting set
+ * then you can reach one commit more than that parent
+ * can reach. So we do not have to run the expensive
+ * count_distance() for single strand of pearls.
+ *
+ * However, if you have more than one parents, you cannot
+ * just add their distance and one for yourself, since
+ * they usually reach the same ancestor and you would
+ * end up counting them twice that way.
+ *
+ * So we will first count distance of merges the usual
+ * way, and then fill the blanks using cheaper algorithm.
+ */
+ for (p = list; p; p = p->next) {
+ if (p->item->object.flags & UNINTERESTING)
+ continue;
+ if (weight(p) != -2)
continue;
- mark_tree_uninteresting(parent->tree);
- if (revs.edge_hint && !(parent->object.flags & SHOWN)) {
- parent->object.flags |= SHOWN;
- printf("-%s\n", sha1_to_hex(parent->object.sha1));
+ weight_set(p, count_distance(p));
+ clear_distance(list);
+
+ /* Does it happen to be at exactly half-way? */
+ if (halfway(p, nr))
+ return p;
+ counted++;
+ }
+
+ show_list("bisection 2 count_distance", counted, nr, list);
+
+ while (counted < nr) {
+ for (p = list; p; p = p->next) {
+ struct commit_list *q;
+ unsigned flags = p->item->object.flags;
+
+ if (0 <= weight(p))
+ continue;
+ for (q = p->item->parents; q; q = q->next) {
+ if (q->item->object.flags & UNINTERESTING)
+ continue;
+ if (0 <= weight(q))
+ break;
+ }
+ if (!q)
+ continue;
+
+ /*
+ * weight for p is unknown but q is known.
+ * add one for p itself if p is to be counted,
+ * otherwise inherit it from q directly.
+ */
+ if (!revs.prune_fn || (flags & TREECHANGE)) {
+ weight_set(p, weight(q)+1);
+ counted++;
+ show_list("bisection 2 count one",
+ counted, nr, list);
+ }
+ else
+ weight_set(p, weight(q));
+
+ /* Does it happen to be at exactly half-way? */
+ if (halfway(p, nr))
+ return p;
}
}
+
+ show_list("bisection 2 counted all", counted, nr, list);
+
+ /* Then find the best one */
+ return best_bisection(list, nr);
}
-static void mark_edges_uninteresting(struct commit_list *list)
+static struct commit_list *find_bisection(struct commit_list *list,
+ int *reaches, int *all)
{
- for ( ; list; list = list->next) {
- struct commit *commit = list->item;
-
- if (commit->object.flags & UNINTERESTING) {
- mark_tree_uninteresting(commit->tree);
+ int nr, on_list;
+ struct commit_list *p, *best, *next, *last;
+ int *weights;
+
+ show_list("bisection 2 entry", 0, 0, list);
+
+ /*
+ * Count the number of total and tree-changing items on the
+ * list, while reversing the list.
+ */
+ for (nr = on_list = 0, last = NULL, p = list;
+ p;
+ p = next) {
+ unsigned flags = p->item->object.flags;
+
+ next = p->next;
+ if (flags & UNINTERESTING)
continue;
- }
- mark_edge_parents_uninteresting(commit);
+ p->next = last;
+ last = p;
+ if (!revs.prune_fn || (flags & TREECHANGE))
+ nr++;
+ on_list++;
+ }
+ list = last;
+ show_list("bisection 2 sorted", 0, nr, list);
+
+ *all = nr;
+ weights = xcalloc(on_list, sizeof(*weights));
+
+ /* Do the real work of finding bisection commit. */
+ best = do_find_bisection(list, nr, weights);
+
+ if (best) {
+ best->next = NULL;
+ *reaches = weight(best);
+ }
+ free(weights);
+
+ return best;
+}
+
+static void read_revisions_from_stdin(struct rev_info *revs)
+{
+ char line[1000];
+
+ while (fgets(line, sizeof(line), stdin) != NULL) {
+ int len = strlen(line);
+ if (line[len - 1] == '\n')
+ line[--len] = 0;
+ if (!len)
+ break;
+ if (line[0] == '-')
+ die("options not supported in --stdin mode");
+ if (handle_revision_arg(line, revs, 0, 1))
+ die("bad revision '%s'", line);
}
}
{
struct commit_list *list;
int i;
+ int read_from_stdin = 0;
+ int bisect_show_vars = 0;
+ git_config(git_default_config);
init_revisions(&revs, prefix);
revs.abbrev = 0;
revs.commit_format = CMIT_FMT_UNSPECIFIED;
bisect_list = 1;
continue;
}
+ if (!strcmp(arg, "--bisect-vars")) {
+ bisect_list = 1;
+ bisect_show_vars = 1;
+ continue;
+ }
+ if (!strcmp(arg, "--stdin")) {
+ if (read_from_stdin++)
+ die("--stdin given twice?");
+ read_revisions_from_stdin(&revs);
+ continue;
+ }
usage(rev_list_usage);
}
revs.diff)
usage(rev_list_usage);
- save_commit_buffer = revs.verbose_header;
+ save_commit_buffer = revs.verbose_header || revs.grep_filter;
track_object_refs = 0;
if (bisect_list)
revs.limited = 1;
prepare_revision_walk(&revs);
if (revs.tree_objects)
- mark_edges_uninteresting(revs.commits);
-
- if (bisect_list)
- revs.commits = find_bisection(revs.commits);
+ mark_edges_uninteresting(revs.commits, &revs, show_edge);
+
+ if (bisect_list) {
+ int reaches = reaches, all = all;
+
+ revs.commits = find_bisection(revs.commits, &reaches, &all);
+ if (bisect_show_vars) {
+ int cnt;
+ if (!revs.commits)
+ return 1;
+ /*
+ * revs.commits can reach "reaches" commits among
+ * "all" commits. If it is good, then there are
+ * (all-reaches) commits left to be bisected.
+ * On the other hand, if it is bad, then the set
+ * to bisect is "reaches".
+ * A bisect set of size N has (N-1) commits further
+ * to test, as we already know one bad one.
+ */
+ cnt = all-reaches;
+ if (cnt < reaches)
+ cnt = reaches;
+ printf("bisect_rev=%s\n"
+ "bisect_nr=%d\n"
+ "bisect_good=%d\n"
+ "bisect_bad=%d\n"
+ "bisect_all=%d\n",
+ sha1_to_hex(revs.commits->item->object.sha1),
+ cnt - 1,
+ all - reaches - 1,
+ reaches - 1,
+ all);
+ return 0;
+ }
+ }
- show_commit_list(&revs);
+ traverse_commit_list(&revs, show_commit, show_object);
return 0;
}