зеркало из https://github.com/microsoft/git.git
1094 строки
25 KiB
C
1094 строки
25 KiB
C
#include "cache.h"
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#include "tag.h"
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#include "commit.h"
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int save_commit_buffer = 1;
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struct sort_node
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{
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/*
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* the number of children of the associated commit
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* that also occur in the list being sorted.
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*/
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unsigned int indegree;
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/*
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* reference to original list item that we will re-use
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* on output.
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*/
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struct commit_list * list_item;
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};
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const char *commit_type = "commit";
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struct cmt_fmt_map {
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const char *n;
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size_t cmp_len;
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enum cmit_fmt v;
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} cmt_fmts[] = {
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{ "raw", 1, CMIT_FMT_RAW },
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{ "medium", 1, CMIT_FMT_MEDIUM },
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{ "short", 1, CMIT_FMT_SHORT },
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{ "email", 1, CMIT_FMT_EMAIL },
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{ "full", 5, CMIT_FMT_FULL },
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{ "fuller", 5, CMIT_FMT_FULLER },
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{ "oneline", 1, CMIT_FMT_ONELINE },
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};
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enum cmit_fmt get_commit_format(const char *arg)
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{
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int i;
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if (!arg || !*arg)
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return CMIT_FMT_DEFAULT;
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if (*arg == '=')
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arg++;
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for (i = 0; i < ARRAY_SIZE(cmt_fmts); i++) {
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if (!strncmp(arg, cmt_fmts[i].n, cmt_fmts[i].cmp_len))
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return cmt_fmts[i].v;
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}
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die("invalid --pretty format: %s", arg);
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}
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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 != TYPE_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(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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struct commit *ret = alloc_commit_node();
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created_object(sha1, &ret->object);
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ret->object.type = TYPE_COMMIT;
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return ret;
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}
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if (!obj->type)
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obj->type = TYPE_COMMIT;
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return check_commit(obj, sha1, 0);
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}
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static unsigned long parse_commit_date(const char *buf)
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{
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unsigned long date;
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if (memcmp(buf, "author", 6))
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return 0;
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while (*buf++ != '\n')
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/* nada */;
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if (memcmp(buf, "committer", 9))
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return 0;
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while (*buf++ != '>')
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/* nada */;
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date = strtoul(buf, NULL, 10);
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if (date == ULONG_MAX)
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date = 0;
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return date;
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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 = memcmp(sha1, graft->sha1, 20);
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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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if (buf[len-1] == '\n')
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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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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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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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}
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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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commit_graft_prepared = 1;
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}
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static 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 parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
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{
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char *tail = buffer;
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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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unsigned n_refs = 0;
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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 + 5 || memcmp(bufptr, "tree ", 5))
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return error("bogus commit object %s", sha1_to_hex(item->object.sha1));
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if (tail <= bufptr + 45 || 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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if (item->tree)
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n_refs++;
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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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if (graft)
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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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n_refs++;
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}
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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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n_refs++;
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}
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}
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item->date = parse_commit_date(bufptr);
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if (track_object_refs) {
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unsigned i = 0;
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struct commit_list *p;
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struct object_refs *refs = alloc_object_refs(n_refs);
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if (item->tree)
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refs->ref[i++] = &item->tree->object;
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for (p = item->parents; p; p = p->next)
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refs->ref[i++] = &p->item->object;
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set_object_refs(&item->object, refs);
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}
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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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char type[20];
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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->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 (strcmp(type, commit_type)) {
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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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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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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 * 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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void sort_by_date(struct commit_list **list)
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{
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struct commit_list *ret = NULL;
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while (*list) {
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insert_by_date((*list)->item, &ret);
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*list = (*list)->next;
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}
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*list = ret;
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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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parse_commit(commit);
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if (!(commit->object.flags & mark)) {
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commit->object.flags |= mark;
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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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void clear_commit_marks(struct commit *commit, unsigned int mark)
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{
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struct commit_list *parents;
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commit->object.flags &= ~mark;
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parents = commit->parents;
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while (parents) {
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struct commit *parent = parents->item;
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/* Have we already cleared this? */
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if (mark & parent->object.flags)
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clear_commit_marks(parent, mark);
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parents = parents->next;
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}
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}
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/*
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* Generic support for pretty-printing the header
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*/
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static int get_one_line(const char *msg, unsigned long len)
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{
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int ret = 0;
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while (len--) {
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char c = *msg++;
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if (!c)
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break;
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ret++;
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if (c == '\n')
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break;
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}
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return ret;
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}
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static int is_rfc2047_special(char ch)
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{
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return ((ch & 0x80) || (ch == '=') || (ch == '?') || (ch == '_'));
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}
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static int add_rfc2047(char *buf, const char *line, int len)
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{
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char *bp = buf;
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int i, needquote;
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static const char q_utf8[] = "=?utf-8?q?";
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for (i = needquote = 0; !needquote && i < len; i++) {
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unsigned ch = line[i];
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if (ch & 0x80)
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needquote++;
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if ((i + 1 < len) &&
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(ch == '=' && line[i+1] == '?'))
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needquote++;
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}
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if (!needquote)
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return sprintf(buf, "%.*s", len, line);
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memcpy(bp, q_utf8, sizeof(q_utf8)-1);
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bp += sizeof(q_utf8)-1;
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for (i = 0; i < len; i++) {
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unsigned ch = line[i] & 0xFF;
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if (is_rfc2047_special(ch)) {
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sprintf(bp, "=%02X", ch);
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bp += 3;
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}
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else if (ch == ' ')
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*bp++ = '_';
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else
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*bp++ = ch;
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}
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memcpy(bp, "?=", 2);
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bp += 2;
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return bp - buf;
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}
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static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf, const char *line)
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{
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char *date;
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int namelen;
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unsigned long time;
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int tz, ret;
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const char *filler = " ";
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if (fmt == CMIT_FMT_ONELINE)
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return 0;
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date = strchr(line, '>');
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if (!date)
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return 0;
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namelen = ++date - line;
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time = strtoul(date, &date, 10);
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tz = strtol(date, NULL, 10);
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if (fmt == CMIT_FMT_EMAIL) {
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char *name_tail = strchr(line, '<');
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int display_name_length;
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if (!name_tail)
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return 0;
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while (line < name_tail && isspace(name_tail[-1]))
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name_tail--;
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display_name_length = name_tail - line;
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filler = "";
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strcpy(buf, "From: ");
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ret = strlen(buf);
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ret += add_rfc2047(buf + ret, line, display_name_length);
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memcpy(buf + ret, name_tail, namelen - display_name_length);
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ret += namelen - display_name_length;
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buf[ret++] = '\n';
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}
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else {
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ret = sprintf(buf, "%s: %.*s%.*s\n", what,
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(fmt == CMIT_FMT_FULLER) ? 4 : 0,
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filler, namelen, line);
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}
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switch (fmt) {
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case CMIT_FMT_MEDIUM:
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ret += sprintf(buf + ret, "Date: %s\n", show_date(time, tz));
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break;
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case CMIT_FMT_EMAIL:
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ret += sprintf(buf + ret, "Date: %s\n",
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show_rfc2822_date(time, tz));
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break;
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case CMIT_FMT_FULLER:
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ret += sprintf(buf + ret, "%sDate: %s\n", what, show_date(time, tz));
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break;
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default:
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/* notin' */
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break;
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}
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return ret;
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}
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static int is_empty_line(const char *line, int *len_p)
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{
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int len = *len_p;
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while (len && isspace(line[len-1]))
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len--;
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*len_p = len;
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return !len;
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}
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static int add_merge_info(enum cmit_fmt fmt, char *buf, const struct commit *commit, int abbrev)
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{
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struct commit_list *parent = commit->parents;
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int offset;
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|
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if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
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!parent || !parent->next)
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return 0;
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|
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offset = sprintf(buf, "Merge:");
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|
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while (parent) {
|
|
struct commit *p = parent->item;
|
|
const char *hex = abbrev
|
|
? find_unique_abbrev(p->object.sha1, abbrev)
|
|
: sha1_to_hex(p->object.sha1);
|
|
const char *dots = (abbrev && strlen(hex) != 40) ? "..." : "";
|
|
parent = parent->next;
|
|
|
|
offset += sprintf(buf + offset, " %s%s", hex, dots);
|
|
}
|
|
buf[offset++] = '\n';
|
|
return offset;
|
|
}
|
|
|
|
unsigned long pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit, unsigned long len, char *buf, unsigned long space, int abbrev, const char *subject, const char *after_subject)
|
|
{
|
|
int hdr = 1, body = 0;
|
|
unsigned long offset = 0;
|
|
int indent = 4;
|
|
int parents_shown = 0;
|
|
const char *msg = commit->buffer;
|
|
int plain_non_ascii = 0;
|
|
|
|
if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
|
|
indent = 0;
|
|
|
|
/* After-subject is used to pass in Content-Type: multipart
|
|
* MIME header; in that case we do not have to do the
|
|
* plaintext content type even if the commit message has
|
|
* non 7-bit ASCII character. Otherwise, check if we need
|
|
* to say this is not a 7-bit ASCII.
|
|
*/
|
|
if (fmt == CMIT_FMT_EMAIL && !after_subject) {
|
|
int i, ch, in_body;
|
|
|
|
for (in_body = i = 0; (ch = msg[i]) && i < len; i++) {
|
|
if (!in_body) {
|
|
/* author could be non 7-bit ASCII but
|
|
* the log may so; skip over the
|
|
* header part first.
|
|
*/
|
|
if (ch == '\n' &&
|
|
i + 1 < len && msg[i+1] == '\n')
|
|
in_body = 1;
|
|
}
|
|
else if (ch & 0x80) {
|
|
plain_non_ascii = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
for (;;) {
|
|
const char *line = msg;
|
|
int linelen = get_one_line(msg, len);
|
|
|
|
if (!linelen)
|
|
break;
|
|
|
|
/*
|
|
* We want some slop for indentation and a possible
|
|
* final "...". Thus the "+ 20".
|
|
*/
|
|
if (offset + linelen + 20 > space) {
|
|
memcpy(buf + offset, " ...\n", 8);
|
|
offset += 8;
|
|
break;
|
|
}
|
|
|
|
msg += linelen;
|
|
len -= linelen;
|
|
if (hdr) {
|
|
if (linelen == 1) {
|
|
hdr = 0;
|
|
if ((fmt != CMIT_FMT_ONELINE) && !subject)
|
|
buf[offset++] = '\n';
|
|
continue;
|
|
}
|
|
if (fmt == CMIT_FMT_RAW) {
|
|
memcpy(buf + offset, line, linelen);
|
|
offset += linelen;
|
|
continue;
|
|
}
|
|
if (!memcmp(line, "parent ", 7)) {
|
|
if (linelen != 48)
|
|
die("bad parent line in commit");
|
|
continue;
|
|
}
|
|
|
|
if (!parents_shown) {
|
|
offset += add_merge_info(fmt, buf + offset,
|
|
commit, abbrev);
|
|
parents_shown = 1;
|
|
continue;
|
|
}
|
|
/*
|
|
* MEDIUM == DEFAULT shows only author with dates.
|
|
* FULL shows both authors but not dates.
|
|
* FULLER shows both authors and dates.
|
|
*/
|
|
if (!memcmp(line, "author ", 7))
|
|
offset += add_user_info("Author", fmt,
|
|
buf + offset,
|
|
line + 7);
|
|
if (!memcmp(line, "committer ", 10) &&
|
|
(fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER))
|
|
offset += add_user_info("Commit", fmt,
|
|
buf + offset,
|
|
line + 10);
|
|
continue;
|
|
}
|
|
|
|
if (is_empty_line(line, &linelen)) {
|
|
if (!body)
|
|
continue;
|
|
if (subject)
|
|
continue;
|
|
if (fmt == CMIT_FMT_SHORT)
|
|
break;
|
|
} else {
|
|
body = 1;
|
|
}
|
|
|
|
if (subject) {
|
|
int slen = strlen(subject);
|
|
memcpy(buf + offset, subject, slen);
|
|
offset += slen;
|
|
offset += add_rfc2047(buf + offset, line, linelen);
|
|
}
|
|
else {
|
|
memset(buf + offset, ' ', indent);
|
|
memcpy(buf + offset + indent, line, linelen);
|
|
offset += linelen + indent;
|
|
}
|
|
buf[offset++] = '\n';
|
|
if (fmt == CMIT_FMT_ONELINE)
|
|
break;
|
|
if (subject && plain_non_ascii) {
|
|
static const char header[] =
|
|
"Content-Type: text/plain; charset=UTF-8\n"
|
|
"Content-Transfer-Encoding: 8bit\n";
|
|
memcpy(buf + offset, header, sizeof(header)-1);
|
|
offset += sizeof(header)-1;
|
|
}
|
|
if (after_subject) {
|
|
int slen = strlen(after_subject);
|
|
if (slen > space - offset - 1)
|
|
slen = space - offset - 1;
|
|
memcpy(buf + offset, after_subject, slen);
|
|
offset += slen;
|
|
after_subject = NULL;
|
|
}
|
|
subject = NULL;
|
|
}
|
|
while (offset && isspace(buf[offset-1]))
|
|
offset--;
|
|
/* Make sure there is an EOLN for the non-oneline case */
|
|
if (fmt != CMIT_FMT_ONELINE)
|
|
buf[offset++] = '\n';
|
|
buf[offset] = '\0';
|
|
return offset;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
int count_parents(struct commit * commit)
|
|
{
|
|
int count = 0;
|
|
struct commit_list * parents = commit->parents;
|
|
for (count=0;parents; parents=parents->next,count++)
|
|
;
|
|
return count;
|
|
}
|
|
|
|
void topo_sort_default_setter(struct commit *c, void *data)
|
|
{
|
|
c->util = data;
|
|
}
|
|
|
|
void *topo_sort_default_getter(struct commit *c)
|
|
{
|
|
return c->util;
|
|
}
|
|
|
|
/*
|
|
* Performs an in-place topological sort on the list supplied.
|
|
*/
|
|
void sort_in_topological_order(struct commit_list ** list, int lifo)
|
|
{
|
|
sort_in_topological_order_fn(list, lifo, topo_sort_default_setter,
|
|
topo_sort_default_getter);
|
|
}
|
|
|
|
void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
|
|
topo_sort_set_fn_t setter,
|
|
topo_sort_get_fn_t getter)
|
|
{
|
|
struct commit_list * next = *list;
|
|
struct commit_list * work = NULL, **insert;
|
|
struct commit_list ** pptr = list;
|
|
struct sort_node * nodes;
|
|
struct sort_node * next_nodes;
|
|
int count = 0;
|
|
|
|
/* determine the size of the list */
|
|
while (next) {
|
|
next = next->next;
|
|
count++;
|
|
}
|
|
|
|
if (!count)
|
|
return;
|
|
/* allocate an array to help sort the list */
|
|
nodes = xcalloc(count, sizeof(*nodes));
|
|
/* link the list to the array */
|
|
next_nodes = nodes;
|
|
next=*list;
|
|
while (next) {
|
|
next_nodes->list_item = next;
|
|
setter(next->item, next_nodes);
|
|
next_nodes++;
|
|
next = next->next;
|
|
}
|
|
/* update the indegree */
|
|
next=*list;
|
|
while (next) {
|
|
struct commit_list * parents = next->item->parents;
|
|
while (parents) {
|
|
struct commit * parent=parents->item;
|
|
struct sort_node * pn = (struct sort_node *) getter(parent);
|
|
|
|
if (pn)
|
|
pn->indegree++;
|
|
parents=parents->next;
|
|
}
|
|
next=next->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.
|
|
*/
|
|
next=*list;
|
|
insert = &work;
|
|
while (next) {
|
|
struct sort_node * node = (struct sort_node *) getter(next->item);
|
|
|
|
if (node->indegree == 0) {
|
|
insert = &commit_list_insert(next->item, insert)->next;
|
|
}
|
|
next=next->next;
|
|
}
|
|
|
|
/* process the list in topological order */
|
|
if (!lifo)
|
|
sort_by_date(&work);
|
|
while (work) {
|
|
struct commit * work_item = pop_commit(&work);
|
|
struct sort_node * work_node = (struct sort_node *) getter(work_item);
|
|
struct commit_list * parents = work_item->parents;
|
|
|
|
while (parents) {
|
|
struct commit * parent=parents->item;
|
|
struct sort_node * pn = (struct sort_node *) getter(parent);
|
|
|
|
if (pn) {
|
|
/*
|
|
* parents are only enqueued for emission
|
|
* when all their children have been emitted thereby
|
|
* guaranteeing topological order.
|
|
*/
|
|
pn->indegree--;
|
|
if (!pn->indegree) {
|
|
if (!lifo)
|
|
insert_by_date(parent, &work);
|
|
else
|
|
commit_list_insert(parent, &work);
|
|
}
|
|
}
|
|
parents=parents->next;
|
|
}
|
|
/*
|
|
* work_item is a commit all of whose children
|
|
* have already been emitted. we can emit it now.
|
|
*/
|
|
*pptr = work_node->list_item;
|
|
pptr = &(*pptr)->next;
|
|
*pptr = NULL;
|
|
setter(work_item, NULL);
|
|
}
|
|
free(nodes);
|
|
}
|
|
|
|
/* merge-rebase stuff */
|
|
|
|
/* bits #0..7 in revision.h */
|
|
#define PARENT1 (1u<< 8)
|
|
#define PARENT2 (1u<< 9)
|
|
#define STALE (1u<<10)
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* A pathological example of how this thing works.
|
|
*
|
|
* Suppose we had this commit graph, where chronologically
|
|
* the timestamp on the commit are A <= B <= C <= D <= E <= F
|
|
* and we are trying to figure out the merge base for E and F
|
|
* commits.
|
|
*
|
|
* F
|
|
* / \
|
|
* E A D
|
|
* \ / /
|
|
* B /
|
|
* \ /
|
|
* C
|
|
*
|
|
* First we push E and F to list to be processed. E gets bit 1
|
|
* and F gets bit 2. The list becomes:
|
|
*
|
|
* list=F(2) E(1), result=empty
|
|
*
|
|
* Then we pop F, the newest commit, from the list. Its flag is 2.
|
|
* We scan its parents, mark them reachable from the side that F is
|
|
* reachable from, and push them to the list:
|
|
*
|
|
* list=E(1) D(2) A(2), result=empty
|
|
*
|
|
* Next pop E and do the same.
|
|
*
|
|
* list=D(2) B(1) A(2), result=empty
|
|
*
|
|
* Next pop D and do the same.
|
|
*
|
|
* list=C(2) B(1) A(2), result=empty
|
|
*
|
|
* Next pop C and do the same.
|
|
*
|
|
* list=B(1) A(2), result=empty
|
|
*
|
|
* Now it is B's turn. We mark its parent, C, reachable from B's side,
|
|
* and push it to the list:
|
|
*
|
|
* list=C(3) A(2), result=empty
|
|
*
|
|
* Now pop C and notice it has flags==3. It is placed on the result list,
|
|
* and the list now contains:
|
|
*
|
|
* list=A(2), result=C(3)
|
|
*
|
|
* We pop A and do the same.
|
|
*
|
|
* list=B(3), result=C(3)
|
|
*
|
|
* Next, we pop B and something very interesting happens. It has flags==3
|
|
* so it is also placed on the result list, and its parents are marked
|
|
* stale, retroactively, and placed back on the list:
|
|
*
|
|
* list=C(7), result=C(7) B(3)
|
|
*
|
|
* Now, list does not have any interesting commit. So we find the newest
|
|
* commit from the result list that is not marked stale. Which is
|
|
* commit B.
|
|
*
|
|
*
|
|
* Another pathological example how this thing used to fail to mark an
|
|
* ancestor of a merge base as STALE before we introduced the
|
|
* postprocessing phase (mark_reachable_commits).
|
|
*
|
|
* 2
|
|
* H
|
|
* 1 / \
|
|
* G A \
|
|
* |\ / \
|
|
* | B \
|
|
* | \ \
|
|
* \ C F
|
|
* \ \ /
|
|
* \ D /
|
|
* \ | /
|
|
* \| /
|
|
* E
|
|
*
|
|
* list A B C D E F G H
|
|
* G1 H2 - - - - - - 1 2
|
|
* H2 E1 B1 - 1 - - 1 - 1 2
|
|
* F2 E1 B1 A2 2 1 - - 1 2 1 2
|
|
* E3 B1 A2 2 1 - - 3 2 1 2
|
|
* B1 A2 2 1 - - 3 2 1 2
|
|
* C1 A2 2 1 1 - 3 2 1 2
|
|
* D1 A2 2 1 1 1 3 2 1 2
|
|
* A2 2 1 1 1 3 2 1 2
|
|
* B3 2 3 1 1 3 2 1 2
|
|
* C7 2 3 7 1 3 2 1 2
|
|
*
|
|
* At this point, unfortunately, everybody in the list is
|
|
* stale, so we fail to complete the following two
|
|
* steps to fully marking stale commits.
|
|
*
|
|
* D7 2 3 7 7 3 2 1 2
|
|
* E7 2 3 7 7 7 2 1 2
|
|
*
|
|
* and we ended up showing E as an interesting merge base.
|
|
* The postprocessing phase re-injects C and continues traversal
|
|
* to contaminate D and E.
|
|
*/
|
|
|
|
static void mark_reachable_commits(struct commit_list *result,
|
|
struct commit_list *list)
|
|
{
|
|
struct commit_list *tmp;
|
|
|
|
/*
|
|
* Postprocess to fully contaminate the well.
|
|
*/
|
|
for (tmp = result; tmp; tmp = tmp->next) {
|
|
struct commit *c = tmp->item;
|
|
/* Reinject stale ones to list,
|
|
* so we can scan their parents.
|
|
*/
|
|
if (c->object.flags & STALE)
|
|
commit_list_insert(c, &list);
|
|
}
|
|
while (list) {
|
|
struct commit *c = list->item;
|
|
struct commit_list *parents;
|
|
|
|
tmp = list;
|
|
list = list->next;
|
|
free(tmp);
|
|
|
|
/* Anything taken out of the list is stale, so
|
|
* mark all its parents stale. We do not
|
|
* parse new ones (we already parsed all the relevant
|
|
* ones).
|
|
*/
|
|
parents = c->parents;
|
|
while (parents) {
|
|
struct commit *p = parents->item;
|
|
parents = parents->next;
|
|
if (!(p->object.flags & STALE)) {
|
|
p->object.flags |= STALE;
|
|
commit_list_insert(p, &list);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
struct commit_list *get_merge_bases(struct commit *rev1, struct commit *rev2,
|
|
int cleanup)
|
|
{
|
|
struct commit_list *list = NULL;
|
|
struct commit_list *result = NULL;
|
|
struct commit_list *tmp = NULL;
|
|
|
|
if (rev1 == rev2)
|
|
return commit_list_insert(rev1, &result);
|
|
|
|
parse_commit(rev1);
|
|
parse_commit(rev2);
|
|
|
|
rev1->object.flags |= PARENT1;
|
|
rev2->object.flags |= PARENT2;
|
|
insert_by_date(rev1, &list);
|
|
insert_by_date(rev2, &list);
|
|
|
|
while (interesting(list)) {
|
|
struct commit *commit = list->item;
|
|
struct commit_list *parents;
|
|
int flags = commit->object.flags
|
|
& (PARENT1 | PARENT2 | STALE);
|
|
|
|
tmp = list;
|
|
list = list->next;
|
|
free(tmp);
|
|
if (flags == (PARENT1 | PARENT2)) {
|
|
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;
|
|
parse_commit(p);
|
|
p->object.flags |= flags;
|
|
insert_by_date(p, &list);
|
|
}
|
|
}
|
|
|
|
if (!result)
|
|
goto finish;
|
|
|
|
if (result->next && list)
|
|
mark_reachable_commits(result, list);
|
|
|
|
/* cull duplicates */
|
|
for (tmp = result, list = NULL; tmp; ) {
|
|
struct commit *commit = tmp->item;
|
|
struct commit_list *next = tmp->next;
|
|
if (commit->object.flags & STALE) {
|
|
if (list != NULL)
|
|
list->next = next;
|
|
free(tmp);
|
|
} else {
|
|
if (list == NULL)
|
|
result = tmp;
|
|
list = tmp;
|
|
commit->object.flags |= STALE;
|
|
}
|
|
|
|
tmp = next;
|
|
}
|
|
|
|
finish:
|
|
if (cleanup) {
|
|
clear_commit_marks(rev1, PARENT1 | PARENT2 | STALE);
|
|
clear_commit_marks(rev2, PARENT1 | PARENT2 | STALE);
|
|
}
|
|
|
|
return result;
|
|
}
|