mirror of
https://github.com/git/git.git
synced 2024-12-13 11:54:56 +08:00
77e6f5bc10
* maint: Fix lseek(2) calls with args 2 and 3 swapped Honor -p<n> when applying git diffs Fix dependency of common-cmds.h Fix renaming branch without config file DESTDIR support for git/contrib/emacs gitweb: Fix bug in "blobdiff" view for split (e.g. file to symlink) patches Document --left-right option to rev-list. Revert "builtin-archive: use RUN_SETUP" rename contrib/hooks/post-receieve-email to contrib/hooks/post-receive-email. rerere: make sorting really stable. Fix t4200-rerere for white-space from "wc -l"
569 lines
13 KiB
C
569 lines
13 KiB
C
#include "cache.h"
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#include "refs.h"
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#include "tag.h"
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#include "commit.h"
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#include "tree.h"
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#include "blob.h"
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#include "tree-walk.h"
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#include "diff.h"
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#include "revision.h"
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#include "list-objects.h"
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#include "builtin.h"
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/* bits #0-15 in revision.h */
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#define COUNTED (1u<<16)
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static const char rev_list_usage[] =
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"git-rev-list [OPTION] <commit-id>... [ -- paths... ]\n"
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" limiting output:\n"
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" --max-count=nr\n"
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" --max-age=epoch\n"
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" --min-age=epoch\n"
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" --sparse\n"
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" --no-merges\n"
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" --remove-empty\n"
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" --all\n"
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" --stdin\n"
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" ordering output:\n"
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" --topo-order\n"
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" --date-order\n"
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" formatting output:\n"
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" --parents\n"
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" --objects | --objects-edge\n"
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" --unpacked\n"
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" --header | --pretty\n"
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" --abbrev=nr | --no-abbrev\n"
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" --abbrev-commit\n"
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" --left-right\n"
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" special purpose:\n"
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" --bisect\n"
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" --bisect-vars"
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;
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static struct rev_info revs;
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static int bisect_list;
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static int show_timestamp;
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static int hdr_termination;
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static const char *header_prefix;
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static void show_commit(struct commit *commit)
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{
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if (show_timestamp)
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printf("%lu ", commit->date);
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if (header_prefix)
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fputs(header_prefix, stdout);
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if (commit->object.flags & BOUNDARY)
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putchar('-');
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else if (revs.left_right) {
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if (commit->object.flags & SYMMETRIC_LEFT)
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putchar('<');
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else
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putchar('>');
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}
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if (revs.abbrev_commit && revs.abbrev)
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fputs(find_unique_abbrev(commit->object.sha1, revs.abbrev),
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stdout);
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else
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fputs(sha1_to_hex(commit->object.sha1), stdout);
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if (revs.parents) {
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struct commit_list *parents = commit->parents;
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while (parents) {
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struct object *o = &(parents->item->object);
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parents = parents->next;
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if (o->flags & TMP_MARK)
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continue;
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printf(" %s", sha1_to_hex(o->sha1));
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o->flags |= TMP_MARK;
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}
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/* TMP_MARK is a general purpose flag that can
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* be used locally, but the user should clean
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* things up after it is done with them.
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*/
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for (parents = commit->parents;
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parents;
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parents = parents->next)
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parents->item->object.flags &= ~TMP_MARK;
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}
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if (revs.commit_format == CMIT_FMT_ONELINE)
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putchar(' ');
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else
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putchar('\n');
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if (revs.verbose_header) {
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static char pretty_header[16384];
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pretty_print_commit(revs.commit_format, commit, ~0,
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pretty_header, sizeof(pretty_header),
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revs.abbrev, NULL, NULL, revs.relative_date);
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printf("%s%c", pretty_header, hdr_termination);
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}
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fflush(stdout);
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if (commit->parents) {
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free_commit_list(commit->parents);
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commit->parents = NULL;
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}
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free(commit->buffer);
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commit->buffer = NULL;
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}
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static void show_object(struct object_array_entry *p)
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{
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/* An object with name "foo\n0000000..." can be used to
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* confuse downstream git-pack-objects very badly.
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*/
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const char *ep = strchr(p->name, '\n');
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if (ep) {
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printf("%s %.*s\n", sha1_to_hex(p->item->sha1),
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(int) (ep - p->name),
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p->name);
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}
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else
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printf("%s %s\n", sha1_to_hex(p->item->sha1), p->name);
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}
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static void show_edge(struct commit *commit)
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{
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printf("-%s\n", sha1_to_hex(commit->object.sha1));
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}
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/*
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* This is a truly stupid algorithm, but it's only
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* used for bisection, and we just don't care enough.
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*
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* We care just barely enough to avoid recursing for
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* non-merge entries.
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*/
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static int count_distance(struct commit_list *entry)
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{
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int nr = 0;
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while (entry) {
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struct commit *commit = entry->item;
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struct commit_list *p;
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if (commit->object.flags & (UNINTERESTING | COUNTED))
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break;
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if (!revs.prune_fn || (commit->object.flags & TREECHANGE))
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nr++;
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commit->object.flags |= COUNTED;
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p = commit->parents;
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entry = p;
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if (p) {
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p = p->next;
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while (p) {
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nr += count_distance(p);
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p = p->next;
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}
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}
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}
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return nr;
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}
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static void clear_distance(struct commit_list *list)
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{
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while (list) {
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struct commit *commit = list->item;
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commit->object.flags &= ~COUNTED;
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list = list->next;
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}
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}
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#define DEBUG_BISECT 0
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static inline int weight(struct commit_list *elem)
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{
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return *((int*)(elem->item->util));
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}
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static inline void weight_set(struct commit_list *elem, int weight)
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{
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*((int*)(elem->item->util)) = weight;
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}
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static int count_interesting_parents(struct commit *commit)
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{
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struct commit_list *p;
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int count;
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for (count = 0, p = commit->parents; p; p = p->next) {
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if (p->item->object.flags & UNINTERESTING)
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continue;
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count++;
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}
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return count;
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}
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static inline int halfway(struct commit_list *p, int distance, int nr)
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{
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/*
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* Don't short-cut something we are not going to return!
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*/
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if (revs.prune_fn && !(p->item->object.flags & TREECHANGE))
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return 0;
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if (DEBUG_BISECT)
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return 0;
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/*
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* 2 and 3 are halfway of 5.
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* 3 is halfway of 6 but 2 and 4 are not.
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*/
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distance *= 2;
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switch (distance - nr) {
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case -1: case 0: case 1:
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return 1;
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default:
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return 0;
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}
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}
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#if !DEBUG_BISECT
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#define show_list(a,b,c,d) do { ; } while (0)
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#else
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static void show_list(const char *debug, int counted, int nr,
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struct commit_list *list)
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{
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struct commit_list *p;
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fprintf(stderr, "%s (%d/%d)\n", debug, counted, nr);
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for (p = list; p; p = p->next) {
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struct commit_list *pp;
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struct commit *commit = p->item;
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unsigned flags = commit->object.flags;
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enum object_type type;
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unsigned long size;
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char *buf = read_sha1_file(commit->object.sha1, &type, &size);
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char *ep, *sp;
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fprintf(stderr, "%c%c%c ",
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(flags & TREECHANGE) ? 'T' : ' ',
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(flags & UNINTERESTING) ? 'U' : ' ',
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(flags & COUNTED) ? 'C' : ' ');
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if (commit->util)
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fprintf(stderr, "%3d", weight(p));
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else
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fprintf(stderr, "---");
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fprintf(stderr, " %.*s", 8, sha1_to_hex(commit->object.sha1));
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for (pp = commit->parents; pp; pp = pp->next)
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fprintf(stderr, " %.*s", 8,
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sha1_to_hex(pp->item->object.sha1));
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sp = strstr(buf, "\n\n");
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if (sp) {
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sp += 2;
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for (ep = sp; *ep && *ep != '\n'; ep++)
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;
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fprintf(stderr, " %.*s", (int)(ep - sp), sp);
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}
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fprintf(stderr, "\n");
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}
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}
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#endif /* DEBUG_BISECT */
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/*
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* zero or positive weight is the number of interesting commits it can
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* reach, including itself. Especially, weight = 0 means it does not
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* reach any tree-changing commits (e.g. just above uninteresting one
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* but traversal is with pathspec).
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*
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* weight = -1 means it has one parent and its distance is yet to
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* be computed.
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*
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* weight = -2 means it has more than one parent and its distance is
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* unknown. After running count_distance() first, they will get zero
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* or positive distance.
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*/
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static struct commit_list *find_bisection(struct commit_list *list,
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int *reaches, int *all)
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{
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int n, nr, on_list, counted, distance;
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struct commit_list *p, *best, *next, *last;
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int *weights;
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show_list("bisection 2 entry", 0, 0, list);
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/*
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* Count the number of total and tree-changing items on the
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* list, while reversing the list.
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*/
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for (nr = on_list = 0, last = NULL, p = list;
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p;
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p = next) {
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unsigned flags = p->item->object.flags;
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next = p->next;
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if (flags & UNINTERESTING)
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continue;
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p->next = last;
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last = p;
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if (!revs.prune_fn || (flags & TREECHANGE))
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nr++;
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on_list++;
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}
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list = last;
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show_list("bisection 2 sorted", 0, nr, list);
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*all = nr;
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weights = xcalloc(on_list, sizeof(int*));
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counted = 0;
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for (n = 0, p = list; p; p = p->next) {
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struct commit *commit = p->item;
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unsigned flags = commit->object.flags;
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p->item->util = &weights[n++];
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switch (count_interesting_parents(commit)) {
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case 0:
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if (!revs.prune_fn || (flags & TREECHANGE)) {
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weight_set(p, 1);
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counted++;
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show_list("bisection 2 count one",
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counted, nr, list);
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}
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/*
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* otherwise, it is known not to reach any
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* tree-changing commit and gets weight 0.
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*/
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break;
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case 1:
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weight_set(p, -1);
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break;
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default:
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weight_set(p, -2);
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break;
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}
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}
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show_list("bisection 2 initialize", counted, nr, list);
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/*
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* If you have only one parent in the resulting set
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* then you can reach one commit more than that parent
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* can reach. So we do not have to run the expensive
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* count_distance() for single strand of pearls.
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*
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* However, if you have more than one parents, you cannot
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* just add their distance and one for yourself, since
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* they usually reach the same ancestor and you would
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* end up counting them twice that way.
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*
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* So we will first count distance of merges the usual
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* way, and then fill the blanks using cheaper algorithm.
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*/
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for (p = list; p; p = p->next) {
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if (p->item->object.flags & UNINTERESTING)
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continue;
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n = weight(p);
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if (n != -2)
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continue;
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distance = count_distance(p);
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clear_distance(list);
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weight_set(p, distance);
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/* Does it happen to be at exactly half-way? */
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if (halfway(p, distance, nr)) {
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p->next = NULL;
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*reaches = distance;
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free(weights);
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return p;
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}
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counted++;
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}
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show_list("bisection 2 count_distance", counted, nr, list);
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while (counted < nr) {
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for (p = list; p; p = p->next) {
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struct commit_list *q;
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unsigned flags = p->item->object.flags;
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if (0 <= weight(p))
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continue;
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for (q = p->item->parents; q; q = q->next) {
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if (q->item->object.flags & UNINTERESTING)
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continue;
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if (0 <= weight(q))
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break;
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}
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if (!q)
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continue;
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/*
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* weight for p is unknown but q is known.
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* add one for p itself if p is to be counted,
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* otherwise inherit it from q directly.
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*/
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if (!revs.prune_fn || (flags & TREECHANGE)) {
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weight_set(p, weight(q)+1);
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counted++;
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show_list("bisection 2 count one",
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counted, nr, list);
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}
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else
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weight_set(p, weight(q));
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/* Does it happen to be at exactly half-way? */
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distance = weight(p);
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if (halfway(p, distance, nr)) {
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p->next = NULL;
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*reaches = distance;
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free(weights);
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return p;
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}
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}
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}
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show_list("bisection 2 counted all", counted, nr, list);
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/* Then find the best one */
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counted = -1;
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best = list;
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for (p = list; p; p = p->next) {
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unsigned flags = p->item->object.flags;
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if (revs.prune_fn && !(flags & TREECHANGE))
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continue;
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distance = weight(p);
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if (nr - distance < distance)
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distance = nr - distance;
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if (distance > counted) {
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best = p;
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counted = distance;
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*reaches = weight(p);
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}
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}
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if (best)
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best->next = NULL;
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free(weights);
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return best;
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}
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static void read_revisions_from_stdin(struct rev_info *revs)
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{
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char line[1000];
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while (fgets(line, sizeof(line), stdin) != NULL) {
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int len = strlen(line);
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if (line[len - 1] == '\n')
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line[--len] = 0;
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if (!len)
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break;
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if (line[0] == '-')
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die("options not supported in --stdin mode");
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if (handle_revision_arg(line, revs, 0, 1))
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die("bad revision '%s'", line);
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}
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}
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int cmd_rev_list(int argc, const char **argv, const char *prefix)
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{
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struct commit_list *list;
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int i;
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int read_from_stdin = 0;
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int bisect_show_vars = 0;
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git_config(git_default_config);
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init_revisions(&revs, prefix);
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revs.abbrev = 0;
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revs.commit_format = CMIT_FMT_UNSPECIFIED;
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argc = setup_revisions(argc, argv, &revs, NULL);
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for (i = 1 ; i < argc; i++) {
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const char *arg = argv[i];
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if (!strcmp(arg, "--header")) {
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revs.verbose_header = 1;
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continue;
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}
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if (!strcmp(arg, "--timestamp")) {
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show_timestamp = 1;
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continue;
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}
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if (!strcmp(arg, "--bisect")) {
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bisect_list = 1;
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continue;
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}
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if (!strcmp(arg, "--bisect-vars")) {
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bisect_list = 1;
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bisect_show_vars = 1;
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continue;
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}
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if (!strcmp(arg, "--stdin")) {
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if (read_from_stdin++)
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die("--stdin given twice?");
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read_revisions_from_stdin(&revs);
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continue;
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}
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usage(rev_list_usage);
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}
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if (revs.commit_format != CMIT_FMT_UNSPECIFIED) {
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/* The command line has a --pretty */
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hdr_termination = '\n';
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if (revs.commit_format == CMIT_FMT_ONELINE)
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header_prefix = "";
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else
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header_prefix = "commit ";
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}
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else if (revs.verbose_header)
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/* Only --header was specified */
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revs.commit_format = CMIT_FMT_RAW;
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list = revs.commits;
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if ((!list &&
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(!(revs.tag_objects||revs.tree_objects||revs.blob_objects) &&
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!revs.pending.nr)) ||
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revs.diff)
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usage(rev_list_usage);
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save_commit_buffer = revs.verbose_header || revs.grep_filter;
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track_object_refs = 0;
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if (bisect_list)
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revs.limited = 1;
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prepare_revision_walk(&revs);
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if (revs.tree_objects)
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mark_edges_uninteresting(revs.commits, &revs, show_edge);
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if (bisect_list) {
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int reaches = reaches, all = all;
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revs.commits = find_bisection(revs.commits, &reaches, &all);
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if (bisect_show_vars) {
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int cnt;
|
|
if (!revs.commits)
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return 1;
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|
/*
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|
* 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".
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|
* A bisect set of size N has (N-1) commits further
|
|
* to test, as we already know one bad one.
|
|
*/
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|
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;
|
|
}
|
|
}
|
|
|
|
traverse_commit_list(&revs, show_commit, show_object);
|
|
|
|
return 0;
|
|
}
|