#include "parse-options.h"
#include "dir.h"
#include "run-command.h"
+#include "quote.h"
+#include "lockfile.h"
+#include "cache-tree.h"
+#include "refs.h"
+#include "commit.h"
+#include "diff.h"
+#include "diffcore.h"
+#include "unpack-trees.h"
+#include "branch.h"
+#include "sequencer.h"
+#include "revision.h"
+#include "merge-recursive.h"
+#include "revision.h"
+#include "log-tree.h"
+
+/**
+ * Returns 1 if the file is empty or does not exist, 0 otherwise.
+ */
+static int is_empty_file(const char *filename)
+{
+ struct stat st;
+
+ if (stat(filename, &st) < 0) {
+ if (errno == ENOENT)
+ return 1;
+ die_errno(_("could not stat %s"), filename);
+ }
+
+ return !st.st_size;
+}
/**
* Like strbuf_getline(), but treats both '\n' and "\r\n" as line terminators.
return 0;
}
+/**
+ * Returns the length of the first line of msg.
+ */
+static int linelen(const char *msg)
+{
+ return strchrnul(msg, '\n') - msg;
+}
+
enum patch_format {
PATCH_FORMAT_UNKNOWN = 0,
PATCH_FORMAT_MBOX
int cur;
int last;
+ /* commit metadata and message */
+ char *author_name;
+ char *author_email;
+ char *author_date;
+ char *msg;
+ size_t msg_len;
+
/* number of digits in patch filename */
int prec;
+
+ /* various operating modes and command line options */
+ int threeway;
+ int quiet;
+ int signoff;
+ int utf8;
+ const char *resolvemsg;
+ int rebasing;
};
/**
state->dir = xstrdup(dir);
state->prec = 4;
+
+ state->utf8 = 1;
}
/**
static void am_state_release(struct am_state *state)
{
free(state->dir);
+ free(state->author_name);
+ free(state->author_email);
+ free(state->author_date);
+ free(state->msg);
}
/**
return mkpath("%s/%s", state->dir, path);
}
+/**
+ * If state->quiet is false, calls fprintf(fp, fmt, ...), and appends a newline
+ * at the end.
+ */
+static void say(const struct am_state *state, FILE *fp, const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ if (!state->quiet) {
+ vfprintf(fp, fmt, ap);
+ putc('\n', fp);
+ }
+ va_end(ap);
+}
+
/**
* Returns 1 if there is an am session in progress, 0 otherwise.
*/
die_errno(_("could not read '%s'"), am_path(state, file));
}
+/**
+ * Reads a KEY=VALUE shell variable assignment from `fp`, returning the VALUE
+ * as a newly-allocated string. VALUE must be a quoted string, and the KEY must
+ * match `key`. Returns NULL on failure.
+ *
+ * This is used by read_author_script() to read the GIT_AUTHOR_* variables from
+ * the author-script.
+ */
+static char *read_shell_var(FILE *fp, const char *key)
+{
+ struct strbuf sb = STRBUF_INIT;
+ const char *str;
+
+ if (strbuf_getline(&sb, fp, '\n'))
+ goto fail;
+
+ if (!skip_prefix(sb.buf, key, &str))
+ goto fail;
+
+ if (!skip_prefix(str, "=", &str))
+ goto fail;
+
+ strbuf_remove(&sb, 0, str - sb.buf);
+
+ str = sq_dequote(sb.buf);
+ if (!str)
+ goto fail;
+
+ return strbuf_detach(&sb, NULL);
+
+fail:
+ strbuf_release(&sb);
+ return NULL;
+}
+
+/**
+ * Reads and parses the state directory's "author-script" file, and sets
+ * state->author_name, state->author_email and state->author_date accordingly.
+ * Returns 0 on success, -1 if the file could not be parsed.
+ *
+ * The author script is of the format:
+ *
+ * GIT_AUTHOR_NAME='$author_name'
+ * GIT_AUTHOR_EMAIL='$author_email'
+ * GIT_AUTHOR_DATE='$author_date'
+ *
+ * where $author_name, $author_email and $author_date are quoted. We are strict
+ * with our parsing, as the file was meant to be eval'd in the old git-am.sh
+ * script, and thus if the file differs from what this function expects, it is
+ * better to bail out than to do something that the user does not expect.
+ */
+static int read_author_script(struct am_state *state)
+{
+ const char *filename = am_path(state, "author-script");
+ FILE *fp;
+
+ assert(!state->author_name);
+ assert(!state->author_email);
+ assert(!state->author_date);
+
+ fp = fopen(filename, "r");
+ if (!fp) {
+ if (errno == ENOENT)
+ return 0;
+ die_errno(_("could not open '%s' for reading"), filename);
+ }
+
+ state->author_name = read_shell_var(fp, "GIT_AUTHOR_NAME");
+ if (!state->author_name) {
+ fclose(fp);
+ return -1;
+ }
+
+ state->author_email = read_shell_var(fp, "GIT_AUTHOR_EMAIL");
+ if (!state->author_email) {
+ fclose(fp);
+ return -1;
+ }
+
+ state->author_date = read_shell_var(fp, "GIT_AUTHOR_DATE");
+ if (!state->author_date) {
+ fclose(fp);
+ return -1;
+ }
+
+ if (fgetc(fp) != EOF) {
+ fclose(fp);
+ return -1;
+ }
+
+ fclose(fp);
+ return 0;
+}
+
+/**
+ * Saves state->author_name, state->author_email and state->author_date in the
+ * state directory's "author-script" file.
+ */
+static void write_author_script(const struct am_state *state)
+{
+ struct strbuf sb = STRBUF_INIT;
+
+ strbuf_addstr(&sb, "GIT_AUTHOR_NAME=");
+ sq_quote_buf(&sb, state->author_name);
+ strbuf_addch(&sb, '\n');
+
+ strbuf_addstr(&sb, "GIT_AUTHOR_EMAIL=");
+ sq_quote_buf(&sb, state->author_email);
+ strbuf_addch(&sb, '\n');
+
+ strbuf_addstr(&sb, "GIT_AUTHOR_DATE=");
+ sq_quote_buf(&sb, state->author_date);
+ strbuf_addch(&sb, '\n');
+
+ write_file(am_path(state, "author-script"), 1, "%s", sb.buf);
+
+ strbuf_release(&sb);
+}
+
+/**
+ * Reads the commit message from the state directory's "final-commit" file,
+ * setting state->msg to its contents and state->msg_len to the length of its
+ * contents in bytes.
+ *
+ * Returns 0 on success, -1 if the file does not exist.
+ */
+static int read_commit_msg(struct am_state *state)
+{
+ struct strbuf sb = STRBUF_INIT;
+
+ assert(!state->msg);
+
+ if (read_state_file(&sb, state, "final-commit", 0) < 0) {
+ strbuf_release(&sb);
+ return -1;
+ }
+
+ state->msg = strbuf_detach(&sb, &state->msg_len);
+ return 0;
+}
+
+/**
+ * Saves state->msg in the state directory's "final-commit" file.
+ */
+static void write_commit_msg(const struct am_state *state)
+{
+ int fd;
+ const char *filename = am_path(state, "final-commit");
+
+ fd = xopen(filename, O_WRONLY | O_CREAT, 0666);
+ if (write_in_full(fd, state->msg, state->msg_len) < 0)
+ die_errno(_("could not write to %s"), filename);
+ close(fd);
+}
+
/**
* Loads state from disk.
*/
die("BUG: state file 'last' does not exist");
state->last = strtol(sb.buf, NULL, 10);
+ if (read_author_script(state) < 0)
+ die(_("could not parse author script"));
+
+ read_commit_msg(state);
+
+ read_state_file(&sb, state, "threeway", 1);
+ state->threeway = !strcmp(sb.buf, "t");
+
+ read_state_file(&sb, state, "quiet", 1);
+ state->quiet = !strcmp(sb.buf, "t");
+
+ read_state_file(&sb, state, "sign", 1);
+ state->signoff = !strcmp(sb.buf, "t");
+
+ read_state_file(&sb, state, "utf8", 1);
+ state->utf8 = !strcmp(sb.buf, "t");
+
+ state->rebasing = !!file_exists(am_path(state, "rebasing"));
+
strbuf_release(&sb);
}
static void am_setup(struct am_state *state, enum patch_format patch_format,
const char **paths)
{
+ unsigned char curr_head[GIT_SHA1_RAWSZ];
+
if (!patch_format)
patch_format = detect_patch_format(paths);
die(_("Failed to split patches."));
}
+ if (state->rebasing)
+ state->threeway = 1;
+
+ write_file(am_path(state, "threeway"), 1, state->threeway ? "t" : "f");
+
+ write_file(am_path(state, "quiet"), 1, state->quiet ? "t" : "f");
+
+ write_file(am_path(state, "sign"), 1, state->signoff ? "t" : "f");
+
+ write_file(am_path(state, "utf8"), 1, state->utf8 ? "t" : "f");
+
+ if (state->rebasing)
+ write_file(am_path(state, "rebasing"), 1, "%s", "");
+ else
+ write_file(am_path(state, "applying"), 1, "%s", "");
+
+ if (!get_sha1("HEAD", curr_head)) {
+ write_file(am_path(state, "abort-safety"), 1, "%s", sha1_to_hex(curr_head));
+ if (!state->rebasing)
+ update_ref("am", "ORIG_HEAD", curr_head, NULL, 0,
+ UPDATE_REFS_DIE_ON_ERR);
+ } else {
+ write_file(am_path(state, "abort-safety"), 1, "%s", "");
+ if (!state->rebasing)
+ delete_ref("ORIG_HEAD", NULL, 0);
+ }
+
/*
* NOTE: Since the "next" and "last" files determine if an am_state
* session is in progress, they should be written last.
*/
static void am_next(struct am_state *state)
{
+ unsigned char head[GIT_SHA1_RAWSZ];
+
+ free(state->author_name);
+ state->author_name = NULL;
+
+ free(state->author_email);
+ state->author_email = NULL;
+
+ free(state->author_date);
+ state->author_date = NULL;
+
+ free(state->msg);
+ state->msg = NULL;
+ state->msg_len = 0;
+
+ unlink(am_path(state, "author-script"));
+ unlink(am_path(state, "final-commit"));
+
+ if (!get_sha1("HEAD", head))
+ write_file(am_path(state, "abort-safety"), 1, "%s", sha1_to_hex(head));
+ else
+ write_file(am_path(state, "abort-safety"), 1, "%s", "");
+
state->cur++;
write_file(am_path(state, "next"), 1, "%d", state->cur);
}
+/**
+ * Returns the filename of the current patch email.
+ */
+static const char *msgnum(const struct am_state *state)
+{
+ static struct strbuf sb = STRBUF_INIT;
+
+ strbuf_reset(&sb);
+ strbuf_addf(&sb, "%0*d", state->prec, state->cur);
+
+ return sb.buf;
+}
+
+/**
+ * Refresh and write index.
+ */
+static void refresh_and_write_cache(void)
+{
+ struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
+
+ hold_locked_index(lock_file, 1);
+ refresh_cache(REFRESH_QUIET);
+ if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
+ die(_("unable to write index file"));
+}
+
+/**
+ * Returns 1 if the index differs from HEAD, 0 otherwise. When on an unborn
+ * branch, returns 1 if there are entries in the index, 0 otherwise. If an
+ * strbuf is provided, the space-separated list of files that differ will be
+ * appended to it.
+ */
+static int index_has_changes(struct strbuf *sb)
+{
+ unsigned char head[GIT_SHA1_RAWSZ];
+ int i;
+
+ if (!get_sha1_tree("HEAD", head)) {
+ struct diff_options opt;
+
+ diff_setup(&opt);
+ DIFF_OPT_SET(&opt, EXIT_WITH_STATUS);
+ if (!sb)
+ DIFF_OPT_SET(&opt, QUICK);
+ do_diff_cache(head, &opt);
+ diffcore_std(&opt);
+ for (i = 0; sb && i < diff_queued_diff.nr; i++) {
+ if (i)
+ strbuf_addch(sb, ' ');
+ strbuf_addstr(sb, diff_queued_diff.queue[i]->two->path);
+ }
+ diff_flush(&opt);
+ return DIFF_OPT_TST(&opt, HAS_CHANGES) != 0;
+ } else {
+ for (i = 0; sb && i < active_nr; i++) {
+ if (i)
+ strbuf_addch(sb, ' ');
+ strbuf_addstr(sb, active_cache[i]->name);
+ }
+ return !!active_nr;
+ }
+}
+
+/**
+ * Dies with a user-friendly message on how to proceed after resolving the
+ * problem. This message can be overridden with state->resolvemsg.
+ */
+static void NORETURN die_user_resolve(const struct am_state *state)
+{
+ if (state->resolvemsg) {
+ printf_ln("%s", state->resolvemsg);
+ } else {
+ const char *cmdline = "git am";
+
+ printf_ln(_("When you have resolved this problem, run \"%s --continue\"."), cmdline);
+ printf_ln(_("If you prefer to skip this patch, run \"%s --skip\" instead."), cmdline);
+ printf_ln(_("To restore the original branch and stop patching, run \"%s --abort\"."), cmdline);
+ }
+
+ exit(128);
+}
+
+/**
+ * Parses `mail` using git-mailinfo, extracting its patch and authorship info.
+ * state->msg will be set to the patch message. state->author_name,
+ * state->author_email and state->author_date will be set to the patch author's
+ * name, email and date respectively. The patch body will be written to the
+ * state directory's "patch" file.
+ *
+ * Returns 1 if the patch should be skipped, 0 otherwise.
+ */
+static int parse_mail(struct am_state *state, const char *mail)
+{
+ FILE *fp;
+ struct child_process cp = CHILD_PROCESS_INIT;
+ struct strbuf sb = STRBUF_INIT;
+ struct strbuf msg = STRBUF_INIT;
+ struct strbuf author_name = STRBUF_INIT;
+ struct strbuf author_date = STRBUF_INIT;
+ struct strbuf author_email = STRBUF_INIT;
+ int ret = 0;
+
+ cp.git_cmd = 1;
+ cp.in = xopen(mail, O_RDONLY, 0);
+ cp.out = xopen(am_path(state, "info"), O_WRONLY | O_CREAT, 0777);
+
+ argv_array_push(&cp.args, "mailinfo");
+ argv_array_push(&cp.args, state->utf8 ? "-u" : "-n");
+ argv_array_push(&cp.args, am_path(state, "msg"));
+ argv_array_push(&cp.args, am_path(state, "patch"));
+
+ if (run_command(&cp) < 0)
+ die("could not parse patch");
+
+ close(cp.in);
+ close(cp.out);
+
+ /* Extract message and author information */
+ fp = xfopen(am_path(state, "info"), "r");
+ while (!strbuf_getline(&sb, fp, '\n')) {
+ const char *x;
+
+ if (skip_prefix(sb.buf, "Subject: ", &x)) {
+ if (msg.len)
+ strbuf_addch(&msg, '\n');
+ strbuf_addstr(&msg, x);
+ } else if (skip_prefix(sb.buf, "Author: ", &x))
+ strbuf_addstr(&author_name, x);
+ else if (skip_prefix(sb.buf, "Email: ", &x))
+ strbuf_addstr(&author_email, x);
+ else if (skip_prefix(sb.buf, "Date: ", &x))
+ strbuf_addstr(&author_date, x);
+ }
+ fclose(fp);
+
+ /* Skip pine's internal folder data */
+ if (!strcmp(author_name.buf, "Mail System Internal Data")) {
+ ret = 1;
+ goto finish;
+ }
+
+ if (is_empty_file(am_path(state, "patch"))) {
+ printf_ln(_("Patch is empty. Was it split wrong?"));
+ die_user_resolve(state);
+ }
+
+ strbuf_addstr(&msg, "\n\n");
+ if (strbuf_read_file(&msg, am_path(state, "msg"), 0) < 0)
+ die_errno(_("could not read '%s'"), am_path(state, "msg"));
+ stripspace(&msg, 0);
+
+ if (state->signoff)
+ append_signoff(&msg, 0, 0);
+
+ assert(!state->author_name);
+ state->author_name = strbuf_detach(&author_name, NULL);
+
+ assert(!state->author_email);
+ state->author_email = strbuf_detach(&author_email, NULL);
+
+ assert(!state->author_date);
+ state->author_date = strbuf_detach(&author_date, NULL);
+
+ assert(!state->msg);
+ state->msg = strbuf_detach(&msg, &state->msg_len);
+
+finish:
+ strbuf_release(&msg);
+ strbuf_release(&author_date);
+ strbuf_release(&author_email);
+ strbuf_release(&author_name);
+ strbuf_release(&sb);
+ return ret;
+}
+
+/**
+ * Sets commit_id to the commit hash where the mail was generated from.
+ * Returns 0 on success, -1 on failure.
+ */
+static int get_mail_commit_sha1(unsigned char *commit_id, const char *mail)
+{
+ struct strbuf sb = STRBUF_INIT;
+ FILE *fp = xfopen(mail, "r");
+ const char *x;
+
+ if (strbuf_getline(&sb, fp, '\n'))
+ return -1;
+
+ if (!skip_prefix(sb.buf, "From ", &x))
+ return -1;
+
+ if (get_sha1_hex(x, commit_id) < 0)
+ return -1;
+
+ strbuf_release(&sb);
+ fclose(fp);
+ return 0;
+}
+
+/**
+ * Sets state->msg, state->author_name, state->author_email, state->author_date
+ * to the commit's respective info.
+ */
+static void get_commit_info(struct am_state *state, struct commit *commit)
+{
+ const char *buffer, *ident_line, *author_date, *msg;
+ size_t ident_len;
+ struct ident_split ident_split;
+ struct strbuf sb = STRBUF_INIT;
+
+ buffer = logmsg_reencode(commit, NULL, get_commit_output_encoding());
+
+ ident_line = find_commit_header(buffer, "author", &ident_len);
+
+ if (split_ident_line(&ident_split, ident_line, ident_len) < 0) {
+ strbuf_add(&sb, ident_line, ident_len);
+ die(_("invalid ident line: %s"), sb.buf);
+ }
+
+ assert(!state->author_name);
+ if (ident_split.name_begin) {
+ strbuf_add(&sb, ident_split.name_begin,
+ ident_split.name_end - ident_split.name_begin);
+ state->author_name = strbuf_detach(&sb, NULL);
+ } else
+ state->author_name = xstrdup("");
+
+ assert(!state->author_email);
+ if (ident_split.mail_begin) {
+ strbuf_add(&sb, ident_split.mail_begin,
+ ident_split.mail_end - ident_split.mail_begin);
+ state->author_email = strbuf_detach(&sb, NULL);
+ } else
+ state->author_email = xstrdup("");
+
+ author_date = show_ident_date(&ident_split, DATE_MODE(NORMAL));
+ strbuf_addstr(&sb, author_date);
+ assert(!state->author_date);
+ state->author_date = strbuf_detach(&sb, NULL);
+
+ assert(!state->msg);
+ msg = strstr(buffer, "\n\n");
+ if (!msg)
+ die(_("unable to parse commit %s"), sha1_to_hex(commit->object.sha1));
+ state->msg = xstrdup(msg + 2);
+ state->msg_len = strlen(state->msg);
+}
+
+/**
+ * Writes `commit` as a patch to the state directory's "patch" file.
+ */
+static void write_commit_patch(const struct am_state *state, struct commit *commit)
+{
+ struct rev_info rev_info;
+ FILE *fp;
+
+ fp = xfopen(am_path(state, "patch"), "w");
+ init_revisions(&rev_info, NULL);
+ rev_info.diff = 1;
+ rev_info.abbrev = 0;
+ rev_info.disable_stdin = 1;
+ rev_info.show_root_diff = 1;
+ rev_info.diffopt.output_format = DIFF_FORMAT_PATCH;
+ rev_info.no_commit_id = 1;
+ DIFF_OPT_SET(&rev_info.diffopt, BINARY);
+ DIFF_OPT_SET(&rev_info.diffopt, FULL_INDEX);
+ rev_info.diffopt.use_color = 0;
+ rev_info.diffopt.file = fp;
+ rev_info.diffopt.close_file = 1;
+ add_pending_object(&rev_info, &commit->object, "");
+ diff_setup_done(&rev_info.diffopt);
+ log_tree_commit(&rev_info, commit);
+}
+
+/**
+ * Like parse_mail(), but parses the mail by looking up its commit ID
+ * directly. This is used in --rebasing mode to bypass git-mailinfo's munging
+ * of patches.
+ *
+ * Will always return 0 as the patch should never be skipped.
+ */
+static int parse_mail_rebase(struct am_state *state, const char *mail)
+{
+ struct commit *commit;
+ unsigned char commit_sha1[GIT_SHA1_RAWSZ];
+
+ if (get_mail_commit_sha1(commit_sha1, mail) < 0)
+ die(_("could not parse %s"), mail);
+
+ commit = lookup_commit_or_die(commit_sha1, mail);
+
+ get_commit_info(state, commit);
+
+ write_commit_patch(state, commit);
+
+ return 0;
+}
+
+/**
+ * Applies current patch with git-apply. Returns 0 on success, -1 otherwise. If
+ * `index_file` is not NULL, the patch will be applied to that index.
+ */
+static int run_apply(const struct am_state *state, const char *index_file)
+{
+ struct child_process cp = CHILD_PROCESS_INIT;
+
+ cp.git_cmd = 1;
+
+ if (index_file)
+ argv_array_pushf(&cp.env_array, "GIT_INDEX_FILE=%s", index_file);
+
+ /*
+ * If we are allowed to fall back on 3-way merge, don't give false
+ * errors during the initial attempt.
+ */
+ if (state->threeway && !index_file) {
+ cp.no_stdout = 1;
+ cp.no_stderr = 1;
+ }
+
+ argv_array_push(&cp.args, "apply");
+
+ if (index_file)
+ argv_array_push(&cp.args, "--cached");
+ else
+ argv_array_push(&cp.args, "--index");
+
+ argv_array_push(&cp.args, am_path(state, "patch"));
+
+ if (run_command(&cp))
+ return -1;
+
+ /* Reload index as git-apply will have modified it. */
+ discard_cache();
+ read_cache_from(index_file ? index_file : get_index_file());
+
+ return 0;
+}
+
+/**
+ * Builds an index that contains just the blobs needed for a 3way merge.
+ */
+static int build_fake_ancestor(const struct am_state *state, const char *index_file)
+{
+ struct child_process cp = CHILD_PROCESS_INIT;
+
+ cp.git_cmd = 1;
+ argv_array_push(&cp.args, "apply");
+ argv_array_pushf(&cp.args, "--build-fake-ancestor=%s", index_file);
+ argv_array_push(&cp.args, am_path(state, "patch"));
+
+ if (run_command(&cp))
+ return -1;
+
+ return 0;
+}
+
+/**
+ * Attempt a threeway merge, using index_path as the temporary index.
+ */
+static int fall_back_threeway(const struct am_state *state, const char *index_path)
+{
+ unsigned char orig_tree[GIT_SHA1_RAWSZ], his_tree[GIT_SHA1_RAWSZ],
+ our_tree[GIT_SHA1_RAWSZ];
+ const unsigned char *bases[1] = {orig_tree};
+ struct merge_options o;
+ struct commit *result;
+ char *his_tree_name;
+
+ if (get_sha1("HEAD", our_tree) < 0)
+ hashcpy(our_tree, EMPTY_TREE_SHA1_BIN);
+
+ if (build_fake_ancestor(state, index_path))
+ return error("could not build fake ancestor");
+
+ discard_cache();
+ read_cache_from(index_path);
+
+ if (write_index_as_tree(orig_tree, &the_index, index_path, 0, NULL))
+ return error(_("Repository lacks necessary blobs to fall back on 3-way merge."));
+
+ say(state, stdout, _("Using index info to reconstruct a base tree..."));
+
+ if (!state->quiet) {
+ /*
+ * List paths that needed 3-way fallback, so that the user can
+ * review them with extra care to spot mismerges.
+ */
+ struct rev_info rev_info;
+ const char *diff_filter_str = "--diff-filter=AM";
+
+ init_revisions(&rev_info, NULL);
+ rev_info.diffopt.output_format = DIFF_FORMAT_NAME_STATUS;
+ diff_opt_parse(&rev_info.diffopt, &diff_filter_str, 1);
+ add_pending_sha1(&rev_info, "HEAD", our_tree, 0);
+ diff_setup_done(&rev_info.diffopt);
+ run_diff_index(&rev_info, 1);
+ }
+
+ if (run_apply(state, index_path))
+ return error(_("Did you hand edit your patch?\n"
+ "It does not apply to blobs recorded in its index."));
+
+ if (write_index_as_tree(his_tree, &the_index, index_path, 0, NULL))
+ return error("could not write tree");
+
+ say(state, stdout, _("Falling back to patching base and 3-way merge..."));
+
+ discard_cache();
+ read_cache();
+
+ /*
+ * This is not so wrong. Depending on which base we picked, orig_tree
+ * may be wildly different from ours, but his_tree has the same set of
+ * wildly different changes in parts the patch did not touch, so
+ * recursive ends up canceling them, saying that we reverted all those
+ * changes.
+ */
+
+ init_merge_options(&o);
+
+ o.branch1 = "HEAD";
+ his_tree_name = xstrfmt("%.*s", linelen(state->msg), state->msg);
+ o.branch2 = his_tree_name;
+
+ if (state->quiet)
+ o.verbosity = 0;
+
+ if (merge_recursive_generic(&o, our_tree, his_tree, 1, bases, &result)) {
+ free(his_tree_name);
+ return error(_("Failed to merge in the changes."));
+ }
+
+ free(his_tree_name);
+ return 0;
+}
+
+/**
+ * Commits the current index with state->msg as the commit message and
+ * state->author_name, state->author_email and state->author_date as the author
+ * information.
+ */
+static void do_commit(const struct am_state *state)
+{
+ unsigned char tree[GIT_SHA1_RAWSZ], parent[GIT_SHA1_RAWSZ],
+ commit[GIT_SHA1_RAWSZ];
+ unsigned char *ptr;
+ struct commit_list *parents = NULL;
+ const char *reflog_msg, *author;
+ struct strbuf sb = STRBUF_INIT;
+
+ if (write_cache_as_tree(tree, 0, NULL))
+ die(_("git write-tree failed to write a tree"));
+
+ if (!get_sha1_commit("HEAD", parent)) {
+ ptr = parent;
+ commit_list_insert(lookup_commit(parent), &parents);
+ } else {
+ ptr = NULL;
+ say(state, stderr, _("applying to an empty history"));
+ }
+
+ author = fmt_ident(state->author_name, state->author_email,
+ state->author_date, IDENT_STRICT);
+
+ if (commit_tree(state->msg, state->msg_len, tree, parents, commit,
+ author, NULL))
+ die(_("failed to write commit object"));
+
+ reflog_msg = getenv("GIT_REFLOG_ACTION");
+ if (!reflog_msg)
+ reflog_msg = "am";
+
+ strbuf_addf(&sb, "%s: %.*s", reflog_msg, linelen(state->msg),
+ state->msg);
+
+ update_ref(sb.buf, "HEAD", commit, ptr, 0, UPDATE_REFS_DIE_ON_ERR);
+
+ strbuf_release(&sb);
+}
+
+/**
+ * Validates the am_state for resuming -- the "msg" and authorship fields must
+ * be filled up.
+ */
+static void validate_resume_state(const struct am_state *state)
+{
+ if (!state->msg)
+ die(_("cannot resume: %s does not exist."),
+ am_path(state, "final-commit"));
+
+ if (!state->author_name || !state->author_email || !state->author_date)
+ die(_("cannot resume: %s does not exist."),
+ am_path(state, "author-script"));
+}
+
/**
* Applies all queued mail.
+ *
+ * If `resume` is true, we are "resuming". The "msg" and authorship fields, as
+ * well as the state directory's "patch" file is used as-is for applying the
+ * patch and committing it.
*/
-static void am_run(struct am_state *state)
+static void am_run(struct am_state *state, int resume)
{
+ const char *argv_gc_auto[] = {"gc", "--auto", NULL};
+ struct strbuf sb = STRBUF_INIT;
+
+ unlink(am_path(state, "dirtyindex"));
+
+ refresh_and_write_cache();
+
+ if (index_has_changes(&sb)) {
+ write_file(am_path(state, "dirtyindex"), 1, "t");
+ die(_("Dirty index: cannot apply patches (dirty: %s)"), sb.buf);
+ }
+
+ strbuf_release(&sb);
+
while (state->cur <= state->last) {
+ const char *mail = am_path(state, msgnum(state));
+ int apply_status;
+
+ if (!file_exists(mail))
+ goto next;
+
+ if (resume) {
+ validate_resume_state(state);
+ resume = 0;
+ } else {
+ int skip;
+
+ if (state->rebasing)
+ skip = parse_mail_rebase(state, mail);
+ else
+ skip = parse_mail(state, mail);
+
+ if (skip)
+ goto next; /* mail should be skipped */
+
+ write_author_script(state);
+ write_commit_msg(state);
+ }
+
+ say(state, stdout, _("Applying: %.*s"), linelen(state->msg), state->msg);
+
+ apply_status = run_apply(state, NULL);
+
+ if (apply_status && state->threeway) {
+ struct strbuf sb = STRBUF_INIT;
+
+ strbuf_addstr(&sb, am_path(state, "patch-merge-index"));
+ apply_status = fall_back_threeway(state, sb.buf);
+ strbuf_release(&sb);
+
+ /*
+ * Applying the patch to an earlier tree and merging
+ * the result may have produced the same tree as ours.
+ */
+ if (!apply_status && !index_has_changes(NULL)) {
+ say(state, stdout, _("No changes -- Patch already applied."));
+ goto next;
+ }
+ }
+
+ if (apply_status) {
+ int advice_amworkdir = 1;
+
+ printf_ln(_("Patch failed at %s %.*s"), msgnum(state),
+ linelen(state->msg), state->msg);
+
+ git_config_get_bool("advice.amworkdir", &advice_amworkdir);
+
+ if (advice_amworkdir)
+ printf_ln(_("The copy of the patch that failed is found in: %s"),
+ am_path(state, "patch"));
+
+ die_user_resolve(state);
+ }
- /* NEEDSWORK: Patch application not implemented yet */
+ do_commit(state);
+next:
am_next(state);
}
+ /*
+ * In rebasing mode, it's up to the caller to take care of
+ * housekeeping.
+ */
+ if (!state->rebasing) {
+ am_destroy(state);
+ run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
+ }
+}
+
+/**
+ * Resume the current am session after patch application failure. The user did
+ * all the hard work, and we do not have to do any patch application. Just
+ * trust and commit what the user has in the index and working tree.
+ */
+static void am_resolve(struct am_state *state)
+{
+ validate_resume_state(state);
+
+ say(state, stdout, _("Applying: %.*s"), linelen(state->msg), state->msg);
+
+ if (!index_has_changes(NULL)) {
+ printf_ln(_("No changes - did you forget to use 'git add'?\n"
+ "If there is nothing left to stage, chances are that something else\n"
+ "already introduced the same changes; you might want to skip this patch."));
+ die_user_resolve(state);
+ }
+
+ if (unmerged_cache()) {
+ printf_ln(_("You still have unmerged paths in your index.\n"
+ "Did you forget to use 'git add'?"));
+ die_user_resolve(state);
+ }
+
+ do_commit(state);
+
+ am_next(state);
+ am_run(state, 0);
+}
+
+/**
+ * Performs a checkout fast-forward from `head` to `remote`. If `reset` is
+ * true, any unmerged entries will be discarded. Returns 0 on success, -1 on
+ * failure.
+ */
+static int fast_forward_to(struct tree *head, struct tree *remote, int reset)
+{
+ struct lock_file *lock_file;
+ struct unpack_trees_options opts;
+ struct tree_desc t[2];
+
+ if (parse_tree(head) || parse_tree(remote))
+ return -1;
+
+ lock_file = xcalloc(1, sizeof(struct lock_file));
+ hold_locked_index(lock_file, 1);
+
+ refresh_cache(REFRESH_QUIET);
+
+ memset(&opts, 0, sizeof(opts));
+ opts.head_idx = 1;
+ opts.src_index = &the_index;
+ opts.dst_index = &the_index;
+ opts.update = 1;
+ opts.merge = 1;
+ opts.reset = reset;
+ opts.fn = twoway_merge;
+ init_tree_desc(&t[0], head->buffer, head->size);
+ init_tree_desc(&t[1], remote->buffer, remote->size);
+
+ if (unpack_trees(2, t, &opts)) {
+ rollback_lock_file(lock_file);
+ return -1;
+ }
+
+ if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
+ die(_("unable to write new index file"));
+
+ return 0;
+}
+
+/**
+ * Clean the index without touching entries that are not modified between
+ * `head` and `remote`.
+ */
+static int clean_index(const unsigned char *head, const unsigned char *remote)
+{
+ struct lock_file *lock_file;
+ struct tree *head_tree, *remote_tree, *index_tree;
+ unsigned char index[GIT_SHA1_RAWSZ];
+ struct pathspec pathspec;
+
+ head_tree = parse_tree_indirect(head);
+ if (!head_tree)
+ return error(_("Could not parse object '%s'."), sha1_to_hex(head));
+
+ remote_tree = parse_tree_indirect(remote);
+ if (!remote_tree)
+ return error(_("Could not parse object '%s'."), sha1_to_hex(remote));
+
+ read_cache_unmerged();
+
+ if (fast_forward_to(head_tree, head_tree, 1))
+ return -1;
+
+ if (write_cache_as_tree(index, 0, NULL))
+ return -1;
+
+ index_tree = parse_tree_indirect(index);
+ if (!index_tree)
+ return error(_("Could not parse object '%s'."), sha1_to_hex(index));
+
+ if (fast_forward_to(index_tree, remote_tree, 0))
+ return -1;
+
+ memset(&pathspec, 0, sizeof(pathspec));
+
+ lock_file = xcalloc(1, sizeof(struct lock_file));
+ hold_locked_index(lock_file, 1);
+
+ if (read_tree(remote_tree, 0, &pathspec)) {
+ rollback_lock_file(lock_file);
+ return -1;
+ }
+
+ if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
+ die(_("unable to write new index file"));
+
+ remove_branch_state();
+
+ return 0;
+}
+
+/**
+ * Resume the current am session by skipping the current patch.
+ */
+static void am_skip(struct am_state *state)
+{
+ unsigned char head[GIT_SHA1_RAWSZ];
+
+ if (get_sha1("HEAD", head))
+ hashcpy(head, EMPTY_TREE_SHA1_BIN);
+
+ if (clean_index(head, head))
+ die(_("failed to clean index"));
+
+ am_next(state);
+ am_run(state, 0);
+}
+
+/**
+ * Returns true if it is safe to reset HEAD to the ORIG_HEAD, false otherwise.
+ *
+ * It is not safe to reset HEAD when:
+ * 1. git-am previously failed because the index was dirty.
+ * 2. HEAD has moved since git-am previously failed.
+ */
+static int safe_to_abort(const struct am_state *state)
+{
+ struct strbuf sb = STRBUF_INIT;
+ unsigned char abort_safety[GIT_SHA1_RAWSZ], head[GIT_SHA1_RAWSZ];
+
+ if (file_exists(am_path(state, "dirtyindex")))
+ return 0;
+
+ if (read_state_file(&sb, state, "abort-safety", 1) > 0) {
+ if (get_sha1_hex(sb.buf, abort_safety))
+ die(_("could not parse %s"), am_path(state, "abort_safety"));
+ } else
+ hashclr(abort_safety);
+
+ if (get_sha1("HEAD", head))
+ hashclr(head);
+
+ if (!hashcmp(head, abort_safety))
+ return 1;
+
+ error(_("You seem to have moved HEAD since the last 'am' failure.\n"
+ "Not rewinding to ORIG_HEAD"));
+
+ return 0;
+}
+
+/**
+ * Aborts the current am session if it is safe to do so.
+ */
+static void am_abort(struct am_state *state)
+{
+ unsigned char curr_head[GIT_SHA1_RAWSZ], orig_head[GIT_SHA1_RAWSZ];
+ int has_curr_head, has_orig_head;
+ char *curr_branch;
+
+ if (!safe_to_abort(state)) {
+ am_destroy(state);
+ return;
+ }
+
+ curr_branch = resolve_refdup("HEAD", 0, curr_head, NULL);
+ has_curr_head = !is_null_sha1(curr_head);
+ if (!has_curr_head)
+ hashcpy(curr_head, EMPTY_TREE_SHA1_BIN);
+
+ has_orig_head = !get_sha1("ORIG_HEAD", orig_head);
+ if (!has_orig_head)
+ hashcpy(orig_head, EMPTY_TREE_SHA1_BIN);
+
+ clean_index(curr_head, orig_head);
+
+ if (has_orig_head)
+ update_ref("am --abort", "HEAD", orig_head,
+ has_curr_head ? curr_head : NULL, 0,
+ UPDATE_REFS_DIE_ON_ERR);
+ else if (curr_branch)
+ delete_ref(curr_branch, NULL, REF_NODEREF);
+
+ free(curr_branch);
am_destroy(state);
}
return 0;
}
+enum resume_mode {
+ RESUME_FALSE = 0,
+ RESUME_APPLY,
+ RESUME_RESOLVED,
+ RESUME_SKIP,
+ RESUME_ABORT
+};
+
int cmd_am(int argc, const char **argv, const char *prefix)
{
struct am_state state;
int patch_format = PATCH_FORMAT_UNKNOWN;
+ enum resume_mode resume = RESUME_FALSE;
const char * const usage[] = {
N_("git am [options] [(<mbox>|<Maildir>)...]"),
+ N_("git am [options] (--continue | --skip | --abort)"),
NULL
};
struct option options[] = {
+ OPT_BOOL('3', "3way", &state.threeway,
+ N_("allow fall back on 3way merging if needed")),
+ OPT__QUIET(&state.quiet, N_("be quiet")),
+ OPT_BOOL('s', "signoff", &state.signoff,
+ N_("add a Signed-off-by line to the commit message")),
+ OPT_BOOL('u', "utf8", &state.utf8,
+ N_("recode into utf8 (default)")),
OPT_CALLBACK(0, "patch-format", &patch_format, N_("format"),
N_("format the patch(es) are in"),
parse_opt_patchformat),
+ OPT_STRING(0, "resolvemsg", &state.resolvemsg, NULL,
+ N_("override error message when patch failure occurs")),
+ OPT_CMDMODE(0, "continue", &resume,
+ N_("continue applying patches after resolving a conflict"),
+ RESUME_RESOLVED),
+ OPT_CMDMODE('r', "resolved", &resume,
+ N_("synonyms for --continue"),
+ RESUME_RESOLVED),
+ OPT_CMDMODE(0, "skip", &resume,
+ N_("skip the current patch"),
+ RESUME_SKIP),
+ OPT_CMDMODE(0, "abort", &resume,
+ N_("restore the original branch and abort the patching operation."),
+ RESUME_ABORT),
+ OPT_HIDDEN_BOOL(0, "rebasing", &state.rebasing,
+ N_("(internal use for git-rebase)")),
OPT_END()
};
argc = parse_options(argc, argv, prefix, options, usage, 0);
- if (am_in_progress(&state))
+ if (read_index_preload(&the_index, NULL) < 0)
+ die(_("failed to read the index"));
+
+ if (am_in_progress(&state)) {
+ /*
+ * Catch user error to feed us patches when there is a session
+ * in progress:
+ *
+ * 1. mbox path(s) are provided on the command-line.
+ * 2. stdin is not a tty: the user is trying to feed us a patch
+ * from standard input. This is somewhat unreliable -- stdin
+ * could be /dev/null for example and the caller did not
+ * intend to feed us a patch but wanted to continue
+ * unattended.
+ */
+ if (argc || (resume == RESUME_FALSE && !isatty(0)))
+ die(_("previous rebase directory %s still exists but mbox given."),
+ state.dir);
+
+ if (resume == RESUME_FALSE)
+ resume = RESUME_APPLY;
+
am_load(&state);
- else {
+ } else {
struct argv_array paths = ARGV_ARRAY_INIT;
int i;
+ /*
+ * Handle stray state directory in the independent-run case. In
+ * the --rebasing case, it is up to the caller to take care of
+ * stray directories.
+ */
+ if (file_exists(state.dir) && !state.rebasing) {
+ if (resume == RESUME_ABORT) {
+ am_destroy(&state);
+ am_state_release(&state);
+ return 0;
+ }
+
+ die(_("Stray %s directory found.\n"
+ "Use \"git am --abort\" to remove it."),
+ state.dir);
+ }
+
+ if (resume)
+ die(_("Resolve operation not in progress, we are not resuming."));
+
for (i = 0; i < argc; i++) {
if (is_absolute_path(argv[i]) || !prefix)
argv_array_push(&paths, argv[i]);
argv_array_clear(&paths);
}
- am_run(&state);
+ switch (resume) {
+ case RESUME_FALSE:
+ am_run(&state, 0);
+ break;
+ case RESUME_APPLY:
+ am_run(&state, 1);
+ break;
+ case RESUME_RESOLVED:
+ am_resolve(&state);
+ break;
+ case RESUME_SKIP:
+ am_skip(&state);
+ break;
+ case RESUME_ABORT:
+ am_abort(&state);
+ break;
+ default:
+ die("BUG: invalid resume value");
+ }
am_state_release(&state);