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![Jeff King](/assets/img/avatar_default.png)
Callers who ask for ERROR_ON_NO_NAME are not so much concerned that the name will be blank (because, after all, we will fall back to using the username), but rather it is a check to make sure that low-quality identities do not end up in things like commit messages or emails (whereas it is OK for them to end up in things like reflogs). When future commits add more quality checks on the identity, each of these callers would want to use those checks, too. Rather than modify each of them later to add a new flag, let's refactor the flag. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
1229 lines
29 KiB
C
1229 lines
29 KiB
C
#include "cache.h"
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#include "tag.h"
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#include "commit.h"
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#include "pkt-line.h"
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#include "utf8.h"
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#include "diff.h"
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#include "revision.h"
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#include "notes.h"
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#include "gpg-interface.h"
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#include "mergesort.h"
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int save_commit_buffer = 1;
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const char *commit_type = "commit";
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static struct commit *check_commit(struct object *obj,
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const unsigned char *sha1,
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int quiet)
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{
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if (obj->type != OBJ_COMMIT) {
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if (!quiet)
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error("Object %s is a %s, not a commit",
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sha1_to_hex(sha1), typename(obj->type));
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return NULL;
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}
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return (struct commit *) obj;
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}
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struct commit *lookup_commit_reference_gently(const unsigned char *sha1,
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int quiet)
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{
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struct object *obj = deref_tag(parse_object(sha1), NULL, 0);
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if (!obj)
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return NULL;
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return check_commit(obj, sha1, quiet);
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}
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struct commit *lookup_commit_reference(const unsigned char *sha1)
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{
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return lookup_commit_reference_gently(sha1, 0);
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}
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struct commit *lookup_commit_or_die(const unsigned char *sha1, const char *ref_name)
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{
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struct commit *c = lookup_commit_reference(sha1);
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if (!c)
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die(_("could not parse %s"), ref_name);
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if (hashcmp(sha1, c->object.sha1)) {
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warning(_("%s %s is not a commit!"),
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ref_name, sha1_to_hex(sha1));
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}
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return c;
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}
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struct commit *lookup_commit(const unsigned char *sha1)
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{
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struct object *obj = lookup_object(sha1);
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if (!obj)
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return create_object(sha1, OBJ_COMMIT, alloc_commit_node());
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if (!obj->type)
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obj->type = OBJ_COMMIT;
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return check_commit(obj, sha1, 0);
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}
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struct commit *lookup_commit_reference_by_name(const char *name)
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{
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unsigned char sha1[20];
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struct commit *commit;
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if (get_sha1(name, sha1))
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return NULL;
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commit = lookup_commit_reference(sha1);
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if (!commit || parse_commit(commit))
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return NULL;
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return commit;
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}
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static unsigned long parse_commit_date(const char *buf, const char *tail)
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{
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const char *dateptr;
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if (buf + 6 >= tail)
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return 0;
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if (memcmp(buf, "author", 6))
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return 0;
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while (buf < tail && *buf++ != '\n')
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/* nada */;
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if (buf + 9 >= tail)
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return 0;
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if (memcmp(buf, "committer", 9))
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return 0;
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while (buf < tail && *buf++ != '>')
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/* nada */;
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if (buf >= tail)
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return 0;
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dateptr = buf;
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while (buf < tail && *buf++ != '\n')
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/* nada */;
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if (buf >= tail)
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return 0;
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/* dateptr < buf && buf[-1] == '\n', so strtoul will stop at buf-1 */
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return strtoul(dateptr, NULL, 10);
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}
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static struct commit_graft **commit_graft;
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static int commit_graft_alloc, commit_graft_nr;
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static int commit_graft_pos(const unsigned char *sha1)
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{
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int lo, hi;
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lo = 0;
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hi = commit_graft_nr;
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while (lo < hi) {
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int mi = (lo + hi) / 2;
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struct commit_graft *graft = commit_graft[mi];
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int cmp = hashcmp(sha1, graft->sha1);
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if (!cmp)
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return mi;
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if (cmp < 0)
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hi = mi;
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else
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lo = mi + 1;
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}
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return -lo - 1;
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}
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int register_commit_graft(struct commit_graft *graft, int ignore_dups)
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{
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int pos = commit_graft_pos(graft->sha1);
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if (0 <= pos) {
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if (ignore_dups)
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free(graft);
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else {
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free(commit_graft[pos]);
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commit_graft[pos] = graft;
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}
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return 1;
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}
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pos = -pos - 1;
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if (commit_graft_alloc <= ++commit_graft_nr) {
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commit_graft_alloc = alloc_nr(commit_graft_alloc);
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commit_graft = xrealloc(commit_graft,
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sizeof(*commit_graft) *
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commit_graft_alloc);
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}
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if (pos < commit_graft_nr)
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memmove(commit_graft + pos + 1,
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commit_graft + pos,
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(commit_graft_nr - pos - 1) *
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sizeof(*commit_graft));
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commit_graft[pos] = graft;
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return 0;
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}
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struct commit_graft *read_graft_line(char *buf, int len)
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{
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/* The format is just "Commit Parent1 Parent2 ...\n" */
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int i;
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struct commit_graft *graft = NULL;
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while (len && isspace(buf[len-1]))
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buf[--len] = '\0';
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if (buf[0] == '#' || buf[0] == '\0')
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return NULL;
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if ((len + 1) % 41)
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goto bad_graft_data;
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i = (len + 1) / 41 - 1;
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graft = xmalloc(sizeof(*graft) + 20 * i);
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graft->nr_parent = i;
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if (get_sha1_hex(buf, graft->sha1))
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goto bad_graft_data;
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for (i = 40; i < len; i += 41) {
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if (buf[i] != ' ')
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goto bad_graft_data;
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if (get_sha1_hex(buf + i + 1, graft->parent[i/41]))
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goto bad_graft_data;
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}
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return graft;
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bad_graft_data:
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error("bad graft data: %s", buf);
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free(graft);
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return NULL;
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}
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static int read_graft_file(const char *graft_file)
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{
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FILE *fp = fopen(graft_file, "r");
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char buf[1024];
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if (!fp)
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return -1;
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while (fgets(buf, sizeof(buf), fp)) {
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/* The format is just "Commit Parent1 Parent2 ...\n" */
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int len = strlen(buf);
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struct commit_graft *graft = read_graft_line(buf, len);
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if (!graft)
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continue;
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if (register_commit_graft(graft, 1))
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error("duplicate graft data: %s", buf);
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}
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fclose(fp);
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return 0;
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}
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static void prepare_commit_graft(void)
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{
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static int commit_graft_prepared;
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char *graft_file;
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if (commit_graft_prepared)
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return;
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graft_file = get_graft_file();
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read_graft_file(graft_file);
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/* make sure shallows are read */
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is_repository_shallow();
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commit_graft_prepared = 1;
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}
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struct commit_graft *lookup_commit_graft(const unsigned char *sha1)
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{
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int pos;
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prepare_commit_graft();
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pos = commit_graft_pos(sha1);
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if (pos < 0)
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return NULL;
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return commit_graft[pos];
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}
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int for_each_commit_graft(each_commit_graft_fn fn, void *cb_data)
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{
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int i, ret;
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for (i = ret = 0; i < commit_graft_nr && !ret; i++)
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ret = fn(commit_graft[i], cb_data);
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return ret;
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}
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int unregister_shallow(const unsigned char *sha1)
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{
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int pos = commit_graft_pos(sha1);
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if (pos < 0)
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return -1;
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if (pos + 1 < commit_graft_nr)
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memmove(commit_graft + pos, commit_graft + pos + 1,
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sizeof(struct commit_graft *)
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* (commit_graft_nr - pos - 1));
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commit_graft_nr--;
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return 0;
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}
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int parse_commit_buffer(struct commit *item, const void *buffer, unsigned long size)
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{
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const char *tail = buffer;
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const char *bufptr = buffer;
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unsigned char parent[20];
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struct commit_list **pptr;
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struct commit_graft *graft;
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if (item->object.parsed)
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return 0;
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item->object.parsed = 1;
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tail += size;
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if (tail <= bufptr + 46 || memcmp(bufptr, "tree ", 5) || bufptr[45] != '\n')
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return error("bogus commit object %s", sha1_to_hex(item->object.sha1));
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if (get_sha1_hex(bufptr + 5, parent) < 0)
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return error("bad tree pointer in commit %s",
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sha1_to_hex(item->object.sha1));
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item->tree = lookup_tree(parent);
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bufptr += 46; /* "tree " + "hex sha1" + "\n" */
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pptr = &item->parents;
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graft = lookup_commit_graft(item->object.sha1);
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while (bufptr + 48 < tail && !memcmp(bufptr, "parent ", 7)) {
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struct commit *new_parent;
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if (tail <= bufptr + 48 ||
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get_sha1_hex(bufptr + 7, parent) ||
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bufptr[47] != '\n')
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return error("bad parents in commit %s", sha1_to_hex(item->object.sha1));
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bufptr += 48;
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/*
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* The clone is shallow if nr_parent < 0, and we must
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* not traverse its real parents even when we unhide them.
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*/
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if (graft && (graft->nr_parent < 0 || grafts_replace_parents))
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continue;
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new_parent = lookup_commit(parent);
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if (new_parent)
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pptr = &commit_list_insert(new_parent, pptr)->next;
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}
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if (graft) {
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int i;
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struct commit *new_parent;
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for (i = 0; i < graft->nr_parent; i++) {
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new_parent = lookup_commit(graft->parent[i]);
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if (!new_parent)
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continue;
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pptr = &commit_list_insert(new_parent, pptr)->next;
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}
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}
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item->date = parse_commit_date(bufptr, tail);
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return 0;
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}
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int parse_commit(struct commit *item)
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{
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enum object_type type;
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void *buffer;
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unsigned long size;
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int ret;
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if (!item)
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return -1;
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if (item->object.parsed)
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return 0;
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buffer = read_sha1_file(item->object.sha1, &type, &size);
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if (!buffer)
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return error("Could not read %s",
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sha1_to_hex(item->object.sha1));
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if (type != OBJ_COMMIT) {
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free(buffer);
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return error("Object %s not a commit",
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sha1_to_hex(item->object.sha1));
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}
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ret = parse_commit_buffer(item, buffer, size);
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if (save_commit_buffer && !ret) {
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item->buffer = buffer;
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return 0;
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}
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free(buffer);
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return ret;
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}
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int find_commit_subject(const char *commit_buffer, const char **subject)
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{
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const char *eol;
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const char *p = commit_buffer;
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while (*p && (*p != '\n' || p[1] != '\n'))
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p++;
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if (*p) {
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p += 2;
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for (eol = p; *eol && *eol != '\n'; eol++)
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; /* do nothing */
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} else
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eol = p;
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*subject = p;
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return eol - p;
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}
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struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p)
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{
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struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
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new_list->item = item;
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new_list->next = *list_p;
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*list_p = new_list;
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return new_list;
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}
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unsigned commit_list_count(const struct commit_list *l)
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{
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unsigned c = 0;
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for (; l; l = l->next )
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c++;
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return c;
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}
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void free_commit_list(struct commit_list *list)
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{
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while (list) {
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struct commit_list *temp = list;
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list = temp->next;
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free(temp);
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}
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}
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struct commit_list * commit_list_insert_by_date(struct commit *item, struct commit_list **list)
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{
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struct commit_list **pp = list;
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struct commit_list *p;
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while ((p = *pp) != NULL) {
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if (p->item->date < item->date) {
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break;
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}
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pp = &p->next;
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}
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return commit_list_insert(item, pp);
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}
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static int commit_list_compare_by_date(const void *a, const void *b)
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{
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unsigned long a_date = ((const struct commit_list *)a)->item->date;
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unsigned long b_date = ((const struct commit_list *)b)->item->date;
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if (a_date < b_date)
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return 1;
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if (a_date > b_date)
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return -1;
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return 0;
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}
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static void *commit_list_get_next(const void *a)
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{
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return ((const struct commit_list *)a)->next;
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}
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static void commit_list_set_next(void *a, void *next)
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{
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((struct commit_list *)a)->next = next;
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}
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void commit_list_sort_by_date(struct commit_list **list)
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{
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*list = llist_mergesort(*list, commit_list_get_next, commit_list_set_next,
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commit_list_compare_by_date);
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}
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struct commit *pop_most_recent_commit(struct commit_list **list,
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unsigned int mark)
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{
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struct commit *ret = (*list)->item;
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struct commit_list *parents = ret->parents;
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struct commit_list *old = *list;
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*list = (*list)->next;
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free(old);
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while (parents) {
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struct commit *commit = parents->item;
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if (!parse_commit(commit) && !(commit->object.flags & mark)) {
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commit->object.flags |= mark;
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commit_list_insert_by_date(commit, list);
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}
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parents = parents->next;
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}
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return ret;
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}
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static void clear_commit_marks_1(struct commit_list **plist,
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struct commit *commit, unsigned int mark)
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{
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while (commit) {
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struct commit_list *parents;
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if (!(mark & commit->object.flags))
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return;
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commit->object.flags &= ~mark;
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parents = commit->parents;
|
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if (!parents)
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return;
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|
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while ((parents = parents->next))
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commit_list_insert(parents->item, plist);
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commit = commit->parents->item;
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}
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}
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void clear_commit_marks(struct commit *commit, unsigned int mark)
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{
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struct commit_list *list = NULL;
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commit_list_insert(commit, &list);
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while (list)
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clear_commit_marks_1(&list, pop_commit(&list), mark);
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}
|
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|
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void clear_commit_marks_for_object_array(struct object_array *a, unsigned mark)
|
|
{
|
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struct object *object;
|
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struct commit *commit;
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unsigned int i;
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|
|
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for (i = 0; i < a->nr; i++) {
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object = a->objects[i].item;
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commit = lookup_commit_reference_gently(object->sha1, 1);
|
|
if (commit)
|
|
clear_commit_marks(commit, mark);
|
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}
|
|
}
|
|
|
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struct commit *pop_commit(struct commit_list **stack)
|
|
{
|
|
struct commit_list *top = *stack;
|
|
struct commit *item = top ? top->item : NULL;
|
|
|
|
if (top) {
|
|
*stack = top->next;
|
|
free(top);
|
|
}
|
|
return item;
|
|
}
|
|
|
|
/*
|
|
* Performs an in-place topological sort on the list supplied.
|
|
*/
|
|
void sort_in_topological_order(struct commit_list ** list, int lifo)
|
|
{
|
|
struct commit_list *next, *orig = *list;
|
|
struct commit_list *work, **insert;
|
|
struct commit_list **pptr;
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|
|
|
if (!orig)
|
|
return;
|
|
*list = NULL;
|
|
|
|
/* Mark them and clear the indegree */
|
|
for (next = orig; next; next = next->next) {
|
|
struct commit *commit = next->item;
|
|
commit->indegree = 1;
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|
}
|
|
|
|
/* update the indegree */
|
|
for (next = orig; next; next = next->next) {
|
|
struct commit_list * parents = next->item->parents;
|
|
while (parents) {
|
|
struct commit *parent = parents->item;
|
|
|
|
if (parent->indegree)
|
|
parent->indegree++;
|
|
parents = parents->next;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* find the tips
|
|
*
|
|
* tips are nodes not reachable from any other node in the list
|
|
*
|
|
* the tips serve as a starting set for the work queue.
|
|
*/
|
|
work = NULL;
|
|
insert = &work;
|
|
for (next = orig; next; next = next->next) {
|
|
struct commit *commit = next->item;
|
|
|
|
if (commit->indegree == 1)
|
|
insert = &commit_list_insert(commit, insert)->next;
|
|
}
|
|
|
|
/* process the list in topological order */
|
|
if (!lifo)
|
|
commit_list_sort_by_date(&work);
|
|
|
|
pptr = list;
|
|
*list = NULL;
|
|
while (work) {
|
|
struct commit *commit;
|
|
struct commit_list *parents, *work_item;
|
|
|
|
work_item = work;
|
|
work = work_item->next;
|
|
work_item->next = NULL;
|
|
|
|
commit = work_item->item;
|
|
for (parents = commit->parents; parents ; parents = parents->next) {
|
|
struct commit *parent = parents->item;
|
|
|
|
if (!parent->indegree)
|
|
continue;
|
|
|
|
/*
|
|
* parents are only enqueued for emission
|
|
* when all their children have been emitted thereby
|
|
* guaranteeing topological order.
|
|
*/
|
|
if (--parent->indegree == 1) {
|
|
if (!lifo)
|
|
commit_list_insert_by_date(parent, &work);
|
|
else
|
|
commit_list_insert(parent, &work);
|
|
}
|
|
}
|
|
/*
|
|
* work_item is a commit all of whose children
|
|
* have already been emitted. we can emit it now.
|
|
*/
|
|
commit->indegree = 0;
|
|
*pptr = work_item;
|
|
pptr = &work_item->next;
|
|
}
|
|
}
|
|
|
|
/* merge-base stuff */
|
|
|
|
/* bits #0..15 in revision.h */
|
|
#define PARENT1 (1u<<16)
|
|
#define PARENT2 (1u<<17)
|
|
#define STALE (1u<<18)
|
|
#define RESULT (1u<<19)
|
|
|
|
static const unsigned all_flags = (PARENT1 | PARENT2 | STALE | RESULT);
|
|
|
|
static struct commit *interesting(struct commit_list *list)
|
|
{
|
|
while (list) {
|
|
struct commit *commit = list->item;
|
|
list = list->next;
|
|
if (commit->object.flags & STALE)
|
|
continue;
|
|
return commit;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct commit_list *merge_bases_many(struct commit *one, int n, struct commit **twos)
|
|
{
|
|
struct commit_list *list = NULL;
|
|
struct commit_list *result = NULL;
|
|
int i;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
if (one == twos[i])
|
|
/*
|
|
* We do not mark this even with RESULT so we do not
|
|
* have to clean it up.
|
|
*/
|
|
return commit_list_insert(one, &result);
|
|
}
|
|
|
|
if (parse_commit(one))
|
|
return NULL;
|
|
for (i = 0; i < n; i++) {
|
|
if (parse_commit(twos[i]))
|
|
return NULL;
|
|
}
|
|
|
|
one->object.flags |= PARENT1;
|
|
commit_list_insert_by_date(one, &list);
|
|
for (i = 0; i < n; i++) {
|
|
twos[i]->object.flags |= PARENT2;
|
|
commit_list_insert_by_date(twos[i], &list);
|
|
}
|
|
|
|
while (interesting(list)) {
|
|
struct commit *commit;
|
|
struct commit_list *parents;
|
|
struct commit_list *next;
|
|
int flags;
|
|
|
|
commit = list->item;
|
|
next = list->next;
|
|
free(list);
|
|
list = next;
|
|
|
|
flags = commit->object.flags & (PARENT1 | PARENT2 | STALE);
|
|
if (flags == (PARENT1 | PARENT2)) {
|
|
if (!(commit->object.flags & RESULT)) {
|
|
commit->object.flags |= RESULT;
|
|
commit_list_insert_by_date(commit, &result);
|
|
}
|
|
/* Mark parents of a found merge stale */
|
|
flags |= STALE;
|
|
}
|
|
parents = commit->parents;
|
|
while (parents) {
|
|
struct commit *p = parents->item;
|
|
parents = parents->next;
|
|
if ((p->object.flags & flags) == flags)
|
|
continue;
|
|
if (parse_commit(p))
|
|
return NULL;
|
|
p->object.flags |= flags;
|
|
commit_list_insert_by_date(p, &list);
|
|
}
|
|
}
|
|
|
|
/* Clean up the result to remove stale ones */
|
|
free_commit_list(list);
|
|
list = result; result = NULL;
|
|
while (list) {
|
|
struct commit_list *next = list->next;
|
|
if (!(list->item->object.flags & STALE))
|
|
commit_list_insert_by_date(list->item, &result);
|
|
free(list);
|
|
list = next;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
struct commit_list *get_octopus_merge_bases(struct commit_list *in)
|
|
{
|
|
struct commit_list *i, *j, *k, *ret = NULL;
|
|
struct commit_list **pptr = &ret;
|
|
|
|
for (i = in; i; i = i->next) {
|
|
if (!ret)
|
|
pptr = &commit_list_insert(i->item, pptr)->next;
|
|
else {
|
|
struct commit_list *new = NULL, *end = NULL;
|
|
|
|
for (j = ret; j; j = j->next) {
|
|
struct commit_list *bases;
|
|
bases = get_merge_bases(i->item, j->item, 1);
|
|
if (!new)
|
|
new = bases;
|
|
else
|
|
end->next = bases;
|
|
for (k = bases; k; k = k->next)
|
|
end = k;
|
|
}
|
|
ret = new;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
struct commit_list *get_merge_bases_many(struct commit *one,
|
|
int n,
|
|
struct commit **twos,
|
|
int cleanup)
|
|
{
|
|
struct commit_list *list;
|
|
struct commit **rslt;
|
|
struct commit_list *result;
|
|
int cnt, i, j;
|
|
|
|
result = merge_bases_many(one, n, twos);
|
|
for (i = 0; i < n; i++) {
|
|
if (one == twos[i])
|
|
return result;
|
|
}
|
|
if (!result || !result->next) {
|
|
if (cleanup) {
|
|
clear_commit_marks(one, all_flags);
|
|
for (i = 0; i < n; i++)
|
|
clear_commit_marks(twos[i], all_flags);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/* There are more than one */
|
|
cnt = 0;
|
|
list = result;
|
|
while (list) {
|
|
list = list->next;
|
|
cnt++;
|
|
}
|
|
rslt = xcalloc(cnt, sizeof(*rslt));
|
|
for (list = result, i = 0; list; list = list->next)
|
|
rslt[i++] = list->item;
|
|
free_commit_list(result);
|
|
|
|
clear_commit_marks(one, all_flags);
|
|
for (i = 0; i < n; i++)
|
|
clear_commit_marks(twos[i], all_flags);
|
|
for (i = 0; i < cnt - 1; i++) {
|
|
for (j = i+1; j < cnt; j++) {
|
|
if (!rslt[i] || !rslt[j])
|
|
continue;
|
|
result = merge_bases_many(rslt[i], 1, &rslt[j]);
|
|
clear_commit_marks(rslt[i], all_flags);
|
|
clear_commit_marks(rslt[j], all_flags);
|
|
for (list = result; list; list = list->next) {
|
|
if (rslt[i] == list->item)
|
|
rslt[i] = NULL;
|
|
if (rslt[j] == list->item)
|
|
rslt[j] = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Surviving ones in rslt[] are the independent results */
|
|
result = NULL;
|
|
for (i = 0; i < cnt; i++) {
|
|
if (rslt[i])
|
|
commit_list_insert_by_date(rslt[i], &result);
|
|
}
|
|
free(rslt);
|
|
return result;
|
|
}
|
|
|
|
struct commit_list *get_merge_bases(struct commit *one, struct commit *two,
|
|
int cleanup)
|
|
{
|
|
return get_merge_bases_many(one, 1, &two, cleanup);
|
|
}
|
|
|
|
int is_descendant_of(struct commit *commit, struct commit_list *with_commit)
|
|
{
|
|
if (!with_commit)
|
|
return 1;
|
|
while (with_commit) {
|
|
struct commit *other;
|
|
|
|
other = with_commit->item;
|
|
with_commit = with_commit->next;
|
|
if (in_merge_bases(other, &commit, 1))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int in_merge_bases(struct commit *commit, struct commit **reference, int num)
|
|
{
|
|
struct commit_list *bases, *b;
|
|
int ret = 0;
|
|
|
|
if (num == 1)
|
|
bases = get_merge_bases(commit, *reference, 1);
|
|
else
|
|
die("not yet");
|
|
for (b = bases; b; b = b->next) {
|
|
if (!hashcmp(commit->object.sha1, b->item->object.sha1)) {
|
|
ret = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
free_commit_list(bases);
|
|
return ret;
|
|
}
|
|
|
|
struct commit_list *reduce_heads(struct commit_list *heads)
|
|
{
|
|
struct commit_list *p;
|
|
struct commit_list *result = NULL, **tail = &result;
|
|
struct commit **other;
|
|
size_t num_head, num_other;
|
|
|
|
if (!heads)
|
|
return NULL;
|
|
|
|
/* Avoid unnecessary reallocations */
|
|
for (p = heads, num_head = 0; p; p = p->next)
|
|
num_head++;
|
|
other = xcalloc(sizeof(*other), num_head);
|
|
|
|
/* For each commit, see if it can be reached by others */
|
|
for (p = heads; p; p = p->next) {
|
|
struct commit_list *q, *base;
|
|
|
|
/* Do we already have this in the result? */
|
|
for (q = result; q; q = q->next)
|
|
if (p->item == q->item)
|
|
break;
|
|
if (q)
|
|
continue;
|
|
|
|
num_other = 0;
|
|
for (q = heads; q; q = q->next) {
|
|
if (p->item == q->item)
|
|
continue;
|
|
other[num_other++] = q->item;
|
|
}
|
|
if (num_other)
|
|
base = get_merge_bases_many(p->item, num_other, other, 1);
|
|
else
|
|
base = NULL;
|
|
/*
|
|
* If p->item does not have anything common with other
|
|
* commits, there won't be any merge base. If it is
|
|
* reachable from some of the others, p->item will be
|
|
* the merge base. If its history is connected with
|
|
* others, but p->item is not reachable by others, we
|
|
* will get something other than p->item back.
|
|
*/
|
|
if (!base || (base->item != p->item))
|
|
tail = &(commit_list_insert(p->item, tail)->next);
|
|
free_commit_list(base);
|
|
}
|
|
free(other);
|
|
return result;
|
|
}
|
|
|
|
static const char gpg_sig_header[] = "gpgsig";
|
|
static const int gpg_sig_header_len = sizeof(gpg_sig_header) - 1;
|
|
|
|
static int do_sign_commit(struct strbuf *buf, const char *keyid)
|
|
{
|
|
struct strbuf sig = STRBUF_INIT;
|
|
int inspos, copypos;
|
|
|
|
/* find the end of the header */
|
|
inspos = strstr(buf->buf, "\n\n") - buf->buf + 1;
|
|
|
|
if (!keyid || !*keyid)
|
|
keyid = get_signing_key();
|
|
if (sign_buffer(buf, &sig, keyid)) {
|
|
strbuf_release(&sig);
|
|
return -1;
|
|
}
|
|
|
|
for (copypos = 0; sig.buf[copypos]; ) {
|
|
const char *bol = sig.buf + copypos;
|
|
const char *eol = strchrnul(bol, '\n');
|
|
int len = (eol - bol) + !!*eol;
|
|
|
|
if (!copypos) {
|
|
strbuf_insert(buf, inspos, gpg_sig_header, gpg_sig_header_len);
|
|
inspos += gpg_sig_header_len;
|
|
}
|
|
strbuf_insert(buf, inspos++, " ", 1);
|
|
strbuf_insert(buf, inspos, bol, len);
|
|
inspos += len;
|
|
copypos += len;
|
|
}
|
|
strbuf_release(&sig);
|
|
return 0;
|
|
}
|
|
|
|
int parse_signed_commit(const unsigned char *sha1,
|
|
struct strbuf *payload, struct strbuf *signature)
|
|
{
|
|
unsigned long size;
|
|
enum object_type type;
|
|
char *buffer = read_sha1_file(sha1, &type, &size);
|
|
int in_signature, saw_signature = -1;
|
|
char *line, *tail;
|
|
|
|
if (!buffer || type != OBJ_COMMIT)
|
|
goto cleanup;
|
|
|
|
line = buffer;
|
|
tail = buffer + size;
|
|
in_signature = 0;
|
|
saw_signature = 0;
|
|
while (line < tail) {
|
|
const char *sig = NULL;
|
|
char *next = memchr(line, '\n', tail - line);
|
|
|
|
next = next ? next + 1 : tail;
|
|
if (in_signature && line[0] == ' ')
|
|
sig = line + 1;
|
|
else if (!prefixcmp(line, gpg_sig_header) &&
|
|
line[gpg_sig_header_len] == ' ')
|
|
sig = line + gpg_sig_header_len + 1;
|
|
if (sig) {
|
|
strbuf_add(signature, sig, next - sig);
|
|
saw_signature = 1;
|
|
in_signature = 1;
|
|
} else {
|
|
if (*line == '\n')
|
|
/* dump the whole remainder of the buffer */
|
|
next = tail;
|
|
strbuf_add(payload, line, next - line);
|
|
in_signature = 0;
|
|
}
|
|
line = next;
|
|
}
|
|
cleanup:
|
|
free(buffer);
|
|
return saw_signature;
|
|
}
|
|
|
|
static void handle_signed_tag(struct commit *parent, struct commit_extra_header ***tail)
|
|
{
|
|
struct merge_remote_desc *desc;
|
|
struct commit_extra_header *mergetag;
|
|
char *buf;
|
|
unsigned long size, len;
|
|
enum object_type type;
|
|
|
|
desc = merge_remote_util(parent);
|
|
if (!desc || !desc->obj)
|
|
return;
|
|
buf = read_sha1_file(desc->obj->sha1, &type, &size);
|
|
if (!buf || type != OBJ_TAG)
|
|
goto free_return;
|
|
len = parse_signature(buf, size);
|
|
if (size == len)
|
|
goto free_return;
|
|
/*
|
|
* We could verify this signature and either omit the tag when
|
|
* it does not validate, but the integrator may not have the
|
|
* public key of the signer of the tag he is merging, while a
|
|
* later auditor may have it while auditing, so let's not run
|
|
* verify-signed-buffer here for now...
|
|
*
|
|
* if (verify_signed_buffer(buf, len, buf + len, size - len, ...))
|
|
* warn("warning: signed tag unverified.");
|
|
*/
|
|
mergetag = xcalloc(1, sizeof(*mergetag));
|
|
mergetag->key = xstrdup("mergetag");
|
|
mergetag->value = buf;
|
|
mergetag->len = size;
|
|
|
|
**tail = mergetag;
|
|
*tail = &mergetag->next;
|
|
return;
|
|
|
|
free_return:
|
|
free(buf);
|
|
}
|
|
|
|
void append_merge_tag_headers(struct commit_list *parents,
|
|
struct commit_extra_header ***tail)
|
|
{
|
|
while (parents) {
|
|
struct commit *parent = parents->item;
|
|
handle_signed_tag(parent, tail);
|
|
parents = parents->next;
|
|
}
|
|
}
|
|
|
|
static void add_extra_header(struct strbuf *buffer,
|
|
struct commit_extra_header *extra)
|
|
{
|
|
strbuf_addstr(buffer, extra->key);
|
|
if (extra->len)
|
|
strbuf_add_lines(buffer, " ", extra->value, extra->len);
|
|
else
|
|
strbuf_addch(buffer, '\n');
|
|
}
|
|
|
|
struct commit_extra_header *read_commit_extra_headers(struct commit *commit,
|
|
const char **exclude)
|
|
{
|
|
struct commit_extra_header *extra = NULL;
|
|
unsigned long size;
|
|
enum object_type type;
|
|
char *buffer = read_sha1_file(commit->object.sha1, &type, &size);
|
|
if (buffer && type == OBJ_COMMIT)
|
|
extra = read_commit_extra_header_lines(buffer, size, exclude);
|
|
free(buffer);
|
|
return extra;
|
|
}
|
|
|
|
static inline int standard_header_field(const char *field, size_t len)
|
|
{
|
|
return ((len == 4 && !memcmp(field, "tree ", 5)) ||
|
|
(len == 6 && !memcmp(field, "parent ", 7)) ||
|
|
(len == 6 && !memcmp(field, "author ", 7)) ||
|
|
(len == 9 && !memcmp(field, "committer ", 10)) ||
|
|
(len == 8 && !memcmp(field, "encoding ", 9)));
|
|
}
|
|
|
|
static int excluded_header_field(const char *field, size_t len, const char **exclude)
|
|
{
|
|
if (!exclude)
|
|
return 0;
|
|
|
|
while (*exclude) {
|
|
size_t xlen = strlen(*exclude);
|
|
if (len == xlen &&
|
|
!memcmp(field, *exclude, xlen) && field[xlen] == ' ')
|
|
return 1;
|
|
exclude++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
struct commit_extra_header *read_commit_extra_header_lines(const char *buffer, size_t size,
|
|
const char **exclude)
|
|
{
|
|
struct commit_extra_header *extra = NULL, **tail = &extra, *it = NULL;
|
|
const char *line, *next, *eof, *eob;
|
|
struct strbuf buf = STRBUF_INIT;
|
|
|
|
for (line = buffer, eob = line + size;
|
|
line < eob && *line != '\n';
|
|
line = next) {
|
|
next = memchr(line, '\n', eob - line);
|
|
next = next ? next + 1 : eob;
|
|
if (*line == ' ') {
|
|
/* continuation */
|
|
if (it)
|
|
strbuf_add(&buf, line + 1, next - (line + 1));
|
|
continue;
|
|
}
|
|
if (it)
|
|
it->value = strbuf_detach(&buf, &it->len);
|
|
strbuf_reset(&buf);
|
|
it = NULL;
|
|
|
|
eof = strchr(line, ' ');
|
|
if (next <= eof)
|
|
eof = next;
|
|
|
|
if (standard_header_field(line, eof - line) ||
|
|
excluded_header_field(line, eof - line, exclude))
|
|
continue;
|
|
|
|
it = xcalloc(1, sizeof(*it));
|
|
it->key = xmemdupz(line, eof-line);
|
|
*tail = it;
|
|
tail = &it->next;
|
|
if (eof + 1 < next)
|
|
strbuf_add(&buf, eof + 1, next - (eof + 1));
|
|
}
|
|
if (it)
|
|
it->value = strbuf_detach(&buf, &it->len);
|
|
return extra;
|
|
}
|
|
|
|
void free_commit_extra_headers(struct commit_extra_header *extra)
|
|
{
|
|
while (extra) {
|
|
struct commit_extra_header *next = extra->next;
|
|
free(extra->key);
|
|
free(extra->value);
|
|
free(extra);
|
|
extra = next;
|
|
}
|
|
}
|
|
|
|
int commit_tree(const struct strbuf *msg, unsigned char *tree,
|
|
struct commit_list *parents, unsigned char *ret,
|
|
const char *author, const char *sign_commit)
|
|
{
|
|
struct commit_extra_header *extra = NULL, **tail = &extra;
|
|
int result;
|
|
|
|
append_merge_tag_headers(parents, &tail);
|
|
result = commit_tree_extended(msg, tree, parents, ret,
|
|
author, sign_commit, extra);
|
|
free_commit_extra_headers(extra);
|
|
return result;
|
|
}
|
|
|
|
static const char commit_utf8_warn[] =
|
|
"Warning: commit message does not conform to UTF-8.\n"
|
|
"You may want to amend it after fixing the message, or set the config\n"
|
|
"variable i18n.commitencoding to the encoding your project uses.\n";
|
|
|
|
int commit_tree_extended(const struct strbuf *msg, unsigned char *tree,
|
|
struct commit_list *parents, unsigned char *ret,
|
|
const char *author, const char *sign_commit,
|
|
struct commit_extra_header *extra)
|
|
{
|
|
int result;
|
|
int encoding_is_utf8;
|
|
struct strbuf buffer;
|
|
|
|
assert_sha1_type(tree, OBJ_TREE);
|
|
|
|
if (memchr(msg->buf, '\0', msg->len))
|
|
return error("a NUL byte in commit log message not allowed.");
|
|
|
|
/* Not having i18n.commitencoding is the same as having utf-8 */
|
|
encoding_is_utf8 = is_encoding_utf8(git_commit_encoding);
|
|
|
|
strbuf_init(&buffer, 8192); /* should avoid reallocs for the headers */
|
|
strbuf_addf(&buffer, "tree %s\n", sha1_to_hex(tree));
|
|
|
|
/*
|
|
* NOTE! This ordering means that the same exact tree merged with a
|
|
* different order of parents will be a _different_ changeset even
|
|
* if everything else stays the same.
|
|
*/
|
|
while (parents) {
|
|
struct commit_list *next = parents->next;
|
|
struct commit *parent = parents->item;
|
|
|
|
strbuf_addf(&buffer, "parent %s\n",
|
|
sha1_to_hex(parent->object.sha1));
|
|
free(parents);
|
|
parents = next;
|
|
}
|
|
|
|
/* Person/date information */
|
|
if (!author)
|
|
author = git_author_info(IDENT_STRICT);
|
|
strbuf_addf(&buffer, "author %s\n", author);
|
|
strbuf_addf(&buffer, "committer %s\n", git_committer_info(IDENT_STRICT));
|
|
if (!encoding_is_utf8)
|
|
strbuf_addf(&buffer, "encoding %s\n", git_commit_encoding);
|
|
|
|
while (extra) {
|
|
add_extra_header(&buffer, extra);
|
|
extra = extra->next;
|
|
}
|
|
strbuf_addch(&buffer, '\n');
|
|
|
|
/* And add the comment */
|
|
strbuf_addbuf(&buffer, msg);
|
|
|
|
/* And check the encoding */
|
|
if (encoding_is_utf8 && !is_utf8(buffer.buf))
|
|
fprintf(stderr, commit_utf8_warn);
|
|
|
|
if (sign_commit && do_sign_commit(&buffer, sign_commit))
|
|
return -1;
|
|
|
|
result = write_sha1_file(buffer.buf, buffer.len, commit_type, ret);
|
|
strbuf_release(&buffer);
|
|
return result;
|
|
}
|
|
|
|
struct commit *get_merge_parent(const char *name)
|
|
{
|
|
struct object *obj;
|
|
struct commit *commit;
|
|
unsigned char sha1[20];
|
|
if (get_sha1(name, sha1))
|
|
return NULL;
|
|
obj = parse_object(sha1);
|
|
commit = (struct commit *)peel_to_type(name, 0, obj, OBJ_COMMIT);
|
|
if (commit && !commit->util) {
|
|
struct merge_remote_desc *desc;
|
|
desc = xmalloc(sizeof(*desc));
|
|
desc->obj = obj;
|
|
desc->name = strdup(name);
|
|
commit->util = desc;
|
|
}
|
|
return commit;
|
|
}
|
|
|
|
/*
|
|
* Append a commit to the end of the commit_list.
|
|
*
|
|
* next starts by pointing to the variable that holds the head of an
|
|
* empty commit_list, and is updated to point to the "next" field of
|
|
* the last item on the list as new commits are appended.
|
|
*
|
|
* Usage example:
|
|
*
|
|
* struct commit_list *list;
|
|
* struct commit_list **next = &list;
|
|
*
|
|
* next = commit_list_append(c1, next);
|
|
* next = commit_list_append(c2, next);
|
|
* assert(commit_list_count(list) == 2);
|
|
* return list;
|
|
*/
|
|
struct commit_list **commit_list_append(struct commit *commit,
|
|
struct commit_list **next)
|
|
{
|
|
struct commit_list *new = xmalloc(sizeof(struct commit_list));
|
|
new->item = commit;
|
|
*next = new;
|
|
new->next = NULL;
|
|
return &new->next;
|
|
}
|