mirror of
https://github.com/git/git.git
synced 2024-11-05 16:52:59 +01:00
80583c0ef6
Traditionally we had 16kB limit when formatting log messages for output, because it was easier to arrange for the caller to have a reasonably big buffer and pass it down without ever worrying about reallocating. This changes the calling convention of pretty_print_commit() to lift this limit. Instead of the buffer and remaining length, it now takes a pointer to the pointer that points at the allocated buffer, and another pointer to the location that stores the allocated length, and reallocates the buffer as necessary. To support the user format, the error return of interpolate() needed to be changed. It used to return a bool telling "Ok the result fits", or "Sorry, I had to truncate it". Now it returns 0 on success, and returns the size of the buffer it wants in order to fit the whole result. Signed-off-by: Junio C Hamano <gitster@pobox.com>
574 lines
13 KiB
C
574 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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char *buf = NULL;
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unsigned long buflen = 0;
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pretty_print_commit(revs.commit_format, commit, ~0,
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&buf, &buflen,
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revs.abbrev, NULL, NULL, revs.date_mode);
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printf("%s%c", buf, hdr_termination);
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free(buf);
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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 (p->item->type == OBJ_BLOB && !has_sha1_file(p->item->sha1))
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die("missing blob object '%s'", sha1_to_hex(p->item->sha1));
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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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|
|
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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;
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|
if (!revs.commits)
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|
return 1;
|
|
/*
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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".
|
|
* 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;
|
|
}
|
|
}
|
|
|
|
traverse_commit_list(&revs, show_commit, show_object);
|
|
|
|
return 0;
|
|
}
|