git-fetch--tool: start rewriting parts of git-fetch in C.
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano
214
builtin-fetch--tool.c
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214
builtin-fetch--tool.c
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@ -0,0 +1,214 @@
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#include "cache.h"
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#include "refs.h"
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#include "commit.h"
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static void show_new(char *type, unsigned char *sha1_new)
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{
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fprintf(stderr, " %s: %s\n", type,
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find_unique_abbrev(sha1_new, DEFAULT_ABBREV));
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}
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static int update_ref(const char *action,
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const char *refname,
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unsigned char *sha1,
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unsigned char *oldval)
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{
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int len;
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char msg[1024];
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char *rla = getenv("GIT_REFLOG_ACTION");
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static struct ref_lock *lock;
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if (!rla)
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rla = "(reflog update)";
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len = snprintf(msg, sizeof(msg), "%s: %s", rla, action);
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if (sizeof(msg) <= len)
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die("insanely long action");
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lock = lock_any_ref_for_update(refname, oldval);
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if (!lock)
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return 1;
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if (write_ref_sha1(lock, sha1, msg) < 0)
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return 1;
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return 0;
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}
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static int update_local_ref(const char *name,
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const char *new_head,
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const char *note,
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int verbose, int force)
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{
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char type[20];
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unsigned char sha1_old[20], sha1_new[20];
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char oldh[41], newh[41];
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struct commit *current, *updated;
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if (get_sha1_hex(new_head, sha1_new))
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die("malformed object name %s", new_head);
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if (sha1_object_info(sha1_new, type, NULL))
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die("object %s not found", new_head);
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if (!*name) {
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/* Not storing */
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if (verbose) {
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fprintf(stderr, "* fetched %s\n", note);
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show_new(type, sha1_new);
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}
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return 0;
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}
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if (get_sha1(name, sha1_old)) {
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char *msg;
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just_store:
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/* new ref */
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if (!strncmp(name, "refs/tags/", 10))
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msg = "storing tag";
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else
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msg = "storing head";
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fprintf(stderr, "* %s: storing %s\n",
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name, note);
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show_new(type, sha1_new);
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return update_ref(msg, name, sha1_new, NULL);
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}
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if (!hashcmp(sha1_old, sha1_new)) {
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if (verbose) {
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fprintf(stderr, "* %s: same as %s\n", name, note);
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show_new(type, sha1_new);
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}
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return 0;
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}
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if (!strncmp(name, "refs/tags/", 10)) {
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fprintf(stderr, "* %s: updating with %s\n", name, note);
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show_new(type, sha1_new);
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return update_ref("updating tag", name, sha1_new, NULL);
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}
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current = lookup_commit_reference(sha1_old);
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updated = lookup_commit_reference(sha1_new);
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if (!current || !updated)
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goto just_store;
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strcpy(oldh, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
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strcpy(newh, find_unique_abbrev(sha1_new, DEFAULT_ABBREV));
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if (in_merge_bases(current, &updated, 1)) {
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fprintf(stderr, "* %s: fast forward to %s\n",
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name, note);
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fprintf(stderr, " old..new: %s..%s\n", oldh, newh);
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return update_ref("fast forward", name, sha1_new, sha1_old);
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}
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if (!force) {
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fprintf(stderr,
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"* %s: not updating to non-fast forward %s\n",
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name, note);
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fprintf(stderr,
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" old...new: %s...%s\n", oldh, newh);
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return 1;
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}
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fprintf(stderr,
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"* %s: forcing update to non-fast forward %s\n",
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name, note);
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fprintf(stderr, " old...new: %s...%s\n", oldh, newh);
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return update_ref("forced-update", name, sha1_new, sha1_old);
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}
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static int append_fetch_head(FILE *fp,
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const char *head, const char *remote,
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const char *remote_name, const char *remote_nick,
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const char *local_name, int not_for_merge,
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int verbose, int force)
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{
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struct commit *commit;
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int remote_len, i, note_len;
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unsigned char sha1[20];
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char note[1024];
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const char *what, *kind;
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if (get_sha1(head, sha1))
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return error("Not a valid object name: %s", head);
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commit = lookup_commit_reference(sha1);
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if (!commit)
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not_for_merge = 1;
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if (!strcmp(remote_name, "HEAD")) {
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kind = "";
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what = "";
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}
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else if (!strncmp(remote_name, "refs/heads/", 11)) {
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kind = "branch";
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what = remote_name + 11;
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}
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else if (!strncmp(remote_name, "refs/tags/", 10)) {
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kind = "tag";
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what = remote_name + 10;
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}
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else if (!strncmp(remote_name, "refs/remotes/", 13)) {
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kind = "remote branch";
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what = remote_name + 13;
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}
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else {
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kind = "";
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what = remote_name;
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}
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remote_len = strlen(remote);
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for (i = remote_len - 1; remote[i] == '/' && 0 <= i; i--)
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;
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remote_len = i + 1;
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if (4 < i && !strncmp(".git", remote + i - 3, 4))
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remote_len = i - 3;
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note_len = sprintf(note, "%s\t%s\t",
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sha1_to_hex(commit ? commit->object.sha1 : sha1),
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not_for_merge ? "not-for-merge" : "");
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if (*what) {
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if (*kind)
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note_len += sprintf(note + note_len, "%s ", kind);
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note_len += sprintf(note + note_len, "'%s' of ", what);
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}
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note_len += sprintf(note + note_len, "%.*s", remote_len, remote);
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fprintf(fp, "%s\n", note);
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return update_local_ref(local_name, head, note, verbose, force);
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}
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int cmd_fetch__tool(int argc, const char **argv, const char *prefix)
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{
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int verbose = 0;
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int force = 0;
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while (1 < argc) {
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const char *arg = argv[1];
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if (!strcmp("-v", arg))
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verbose = 1;
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else if (!strcmp("-f", arg))
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force = 1;
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else
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break;
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argc--;
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argv++;
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}
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if (argc <= 1)
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return error("Missing subcommand");
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if (!strcmp("append-fetch-head", argv[1])) {
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int result;
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FILE *fp;
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if (argc != 8)
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return error("append-fetch-head takes 6 args");
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fp = fopen(git_path("FETCH_HEAD"), "a");
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result = append_fetch_head(fp, argv[2], argv[3],
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argv[4], argv[5],
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argv[6], !!argv[7][0],
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verbose, force);
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fclose(fp);
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return result;
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}
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if (!strcmp("update-local-ref", argv[1])) {
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if (argc != 5)
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return error("update-local-ref takes 3 args");
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return update_local_ref(argv[2], argv[3], argv[4],
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verbose, force);
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}
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return error("Unknown subcommand: %s", argv[1]);
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}
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