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![Ramkumar Ramachandra](/assets/img/avatar_default.png)
The current code uses a set of file-scope static variables to tell the cherry-pick/ revert machinery how to replay the changes, and initializes them by parsing the command-line arguments. In later steps in this series, we would like to introduce an API function that calls into this machinery directly and have a way to tell it what to do. Hence, introduce a structure to group these variables, so that the API can take them as a single replay_options parameter. The only exception is the variable "me" -- remove it since it not an independent option, and can be inferred from the action. Unfortunately, this patch introduces a minor regression. Parsing strategy-option violates a C89 rule: Initializers cannot refer to variables whose address is not known at compile time. Currently, this rule is violated by some other parts of Git as well, and it is possible to get GCC to report these instances using the "-std=c89 -pedantic" option. Inspired-by: Christian Couder <chriscool@tuxfamily.org> Mentored-by: Jonathan Nieder <jrnieder@gmail.com> Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
619 lines
16 KiB
C
619 lines
16 KiB
C
#include "cache.h"
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#include "builtin.h"
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#include "object.h"
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#include "commit.h"
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#include "tag.h"
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#include "run-command.h"
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#include "exec_cmd.h"
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#include "utf8.h"
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#include "parse-options.h"
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#include "cache-tree.h"
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#include "diff.h"
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#include "revision.h"
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#include "rerere.h"
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#include "merge-recursive.h"
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#include "refs.h"
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/*
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* This implements the builtins revert and cherry-pick.
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*
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* Copyright (c) 2007 Johannes E. Schindelin
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*
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* Based on git-revert.sh, which is
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*
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* Copyright (c) 2005 Linus Torvalds
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* Copyright (c) 2005 Junio C Hamano
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*/
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static const char * const revert_usage[] = {
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"git revert [options] <commit-ish>",
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NULL
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};
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static const char * const cherry_pick_usage[] = {
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"git cherry-pick [options] <commit-ish>",
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NULL
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};
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enum replay_action { REVERT, CHERRY_PICK };
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struct replay_opts {
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enum replay_action action;
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/* Boolean options */
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int edit;
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int record_origin;
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int no_commit;
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int signoff;
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int allow_ff;
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int allow_rerere_auto;
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int mainline;
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int commit_argc;
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const char **commit_argv;
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/* Merge strategy */
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const char *strategy;
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const char **xopts;
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size_t xopts_nr, xopts_alloc;
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};
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#define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION"
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static const char *action_name(const struct replay_opts *opts)
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{
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return opts->action == REVERT ? "revert" : "cherry-pick";
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}
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static char *get_encoding(const char *message);
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static const char * const *revert_or_cherry_pick_usage(struct replay_opts *opts)
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{
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return opts->action == REVERT ? revert_usage : cherry_pick_usage;
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}
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static int option_parse_x(const struct option *opt,
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const char *arg, int unset)
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{
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struct replay_opts **opts_ptr = opt->value;
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struct replay_opts *opts = *opts_ptr;
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if (unset)
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return 0;
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ALLOC_GROW(opts->xopts, opts->xopts_nr + 1, opts->xopts_alloc);
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opts->xopts[opts->xopts_nr++] = xstrdup(arg);
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return 0;
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}
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static void parse_args(int argc, const char **argv, struct replay_opts *opts)
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{
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const char * const * usage_str = revert_or_cherry_pick_usage(opts);
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int noop;
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struct option options[] = {
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OPT_BOOLEAN('n', "no-commit", &opts->no_commit, "don't automatically commit"),
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OPT_BOOLEAN('e', "edit", &opts->edit, "edit the commit message"),
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{ OPTION_BOOLEAN, 'r', NULL, &noop, NULL, "no-op (backward compatibility)",
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PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 0 },
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OPT_BOOLEAN('s', "signoff", &opts->signoff, "add Signed-off-by:"),
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OPT_INTEGER('m', "mainline", &opts->mainline, "parent number"),
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OPT_RERERE_AUTOUPDATE(&opts->allow_rerere_auto),
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OPT_STRING(0, "strategy", &opts->strategy, "strategy", "merge strategy"),
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OPT_CALLBACK('X', "strategy-option", &opts, "option",
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"option for merge strategy", option_parse_x),
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OPT_END(),
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OPT_END(),
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OPT_END(),
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};
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if (opts->action == CHERRY_PICK) {
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struct option cp_extra[] = {
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OPT_BOOLEAN('x', NULL, &opts->record_origin, "append commit name"),
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OPT_BOOLEAN(0, "ff", &opts->allow_ff, "allow fast-forward"),
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OPT_END(),
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};
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if (parse_options_concat(options, ARRAY_SIZE(options), cp_extra))
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die(_("program error"));
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}
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opts->commit_argc = parse_options(argc, argv, NULL, options, usage_str,
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PARSE_OPT_KEEP_ARGV0 |
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PARSE_OPT_KEEP_UNKNOWN);
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if (opts->commit_argc < 2)
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usage_with_options(usage_str, options);
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opts->commit_argv = argv;
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}
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struct commit_message {
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char *parent_label;
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const char *label;
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const char *subject;
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char *reencoded_message;
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const char *message;
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};
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static int get_message(struct commit *commit, struct commit_message *out)
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{
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const char *encoding;
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const char *abbrev, *subject;
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int abbrev_len, subject_len;
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char *q;
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if (!commit->buffer)
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return -1;
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encoding = get_encoding(commit->buffer);
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if (!encoding)
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encoding = "UTF-8";
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if (!git_commit_encoding)
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git_commit_encoding = "UTF-8";
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out->reencoded_message = NULL;
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out->message = commit->buffer;
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if (strcmp(encoding, git_commit_encoding))
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out->reencoded_message = reencode_string(commit->buffer,
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git_commit_encoding, encoding);
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if (out->reencoded_message)
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out->message = out->reencoded_message;
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abbrev = find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV);
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abbrev_len = strlen(abbrev);
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subject_len = find_commit_subject(out->message, &subject);
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out->parent_label = xmalloc(strlen("parent of ") + abbrev_len +
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strlen("... ") + subject_len + 1);
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q = out->parent_label;
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q = mempcpy(q, "parent of ", strlen("parent of "));
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out->label = q;
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q = mempcpy(q, abbrev, abbrev_len);
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q = mempcpy(q, "... ", strlen("... "));
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out->subject = q;
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q = mempcpy(q, subject, subject_len);
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*q = '\0';
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return 0;
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}
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static void free_message(struct commit_message *msg)
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{
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free(msg->parent_label);
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free(msg->reencoded_message);
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}
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static char *get_encoding(const char *message)
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{
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const char *p = message, *eol;
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while (*p && *p != '\n') {
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for (eol = p + 1; *eol && *eol != '\n'; eol++)
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; /* do nothing */
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if (!prefixcmp(p, "encoding ")) {
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char *result = xmalloc(eol - 8 - p);
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strlcpy(result, p + 9, eol - 8 - p);
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return result;
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}
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p = eol;
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if (*p == '\n')
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p++;
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}
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return NULL;
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}
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static void write_cherry_pick_head(struct commit *commit)
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{
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int fd;
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struct strbuf buf = STRBUF_INIT;
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strbuf_addf(&buf, "%s\n", sha1_to_hex(commit->object.sha1));
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fd = open(git_path("CHERRY_PICK_HEAD"), O_WRONLY | O_CREAT, 0666);
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if (fd < 0)
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die_errno(_("Could not open '%s' for writing"),
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git_path("CHERRY_PICK_HEAD"));
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if (write_in_full(fd, buf.buf, buf.len) != buf.len || close(fd))
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die_errno(_("Could not write to '%s'"), git_path("CHERRY_PICK_HEAD"));
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strbuf_release(&buf);
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}
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static void print_advice(void)
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{
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char *msg = getenv("GIT_CHERRY_PICK_HELP");
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if (msg) {
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fprintf(stderr, "%s\n", msg);
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/*
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* A conflict has occured but the porcelain
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* (typically rebase --interactive) wants to take care
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* of the commit itself so remove CHERRY_PICK_HEAD
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*/
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unlink(git_path("CHERRY_PICK_HEAD"));
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return;
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}
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advise("after resolving the conflicts, mark the corrected paths");
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advise("with 'git add <paths>' or 'git rm <paths>'");
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advise("and commit the result with 'git commit'");
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}
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static void write_message(struct strbuf *msgbuf, const char *filename)
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{
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static struct lock_file msg_file;
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int msg_fd = hold_lock_file_for_update(&msg_file, filename,
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LOCK_DIE_ON_ERROR);
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if (write_in_full(msg_fd, msgbuf->buf, msgbuf->len) < 0)
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die_errno(_("Could not write to %s."), filename);
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strbuf_release(msgbuf);
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if (commit_lock_file(&msg_file) < 0)
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die(_("Error wrapping up %s"), filename);
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}
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static struct tree *empty_tree(void)
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{
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struct tree *tree = xcalloc(1, sizeof(struct tree));
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tree->object.parsed = 1;
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tree->object.type = OBJ_TREE;
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pretend_sha1_file(NULL, 0, OBJ_TREE, tree->object.sha1);
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return tree;
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}
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static NORETURN void die_dirty_index(struct replay_opts *opts)
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{
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if (read_cache_unmerged()) {
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die_resolve_conflict(action_name(opts));
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} else {
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if (advice_commit_before_merge) {
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if (opts->action == REVERT)
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die(_("Your local changes would be overwritten by revert.\n"
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"Please, commit your changes or stash them to proceed."));
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else
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die(_("Your local changes would be overwritten by cherry-pick.\n"
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"Please, commit your changes or stash them to proceed."));
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} else {
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if (opts->action == REVERT)
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die(_("Your local changes would be overwritten by revert.\n"));
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else
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die(_("Your local changes would be overwritten by cherry-pick.\n"));
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}
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}
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}
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static int fast_forward_to(const unsigned char *to, const unsigned char *from)
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{
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struct ref_lock *ref_lock;
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read_cache();
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if (checkout_fast_forward(from, to))
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exit(1); /* the callee should have complained already */
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ref_lock = lock_any_ref_for_update("HEAD", from, 0);
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return write_ref_sha1(ref_lock, to, "cherry-pick");
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}
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static int do_recursive_merge(struct commit *base, struct commit *next,
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const char *base_label, const char *next_label,
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unsigned char *head, struct strbuf *msgbuf,
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struct replay_opts *opts)
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{
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struct merge_options o;
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struct tree *result, *next_tree, *base_tree, *head_tree;
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int clean, index_fd;
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const char **xopt;
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static struct lock_file index_lock;
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index_fd = hold_locked_index(&index_lock, 1);
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read_cache();
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init_merge_options(&o);
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o.ancestor = base ? base_label : "(empty tree)";
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o.branch1 = "HEAD";
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o.branch2 = next ? next_label : "(empty tree)";
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head_tree = parse_tree_indirect(head);
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next_tree = next ? next->tree : empty_tree();
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base_tree = base ? base->tree : empty_tree();
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for (xopt = opts->xopts; xopt != opts->xopts + opts->xopts_nr; xopt++)
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parse_merge_opt(&o, *xopt);
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clean = merge_trees(&o,
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head_tree,
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next_tree, base_tree, &result);
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if (active_cache_changed &&
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(write_cache(index_fd, active_cache, active_nr) ||
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commit_locked_index(&index_lock)))
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/* TRANSLATORS: %s will be "revert" or "cherry-pick" */
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die(_("%s: Unable to write new index file"), action_name(opts));
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rollback_lock_file(&index_lock);
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if (!clean) {
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int i;
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strbuf_addstr(msgbuf, "\nConflicts:\n\n");
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for (i = 0; i < active_nr;) {
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struct cache_entry *ce = active_cache[i++];
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if (ce_stage(ce)) {
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strbuf_addch(msgbuf, '\t');
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strbuf_addstr(msgbuf, ce->name);
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strbuf_addch(msgbuf, '\n');
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while (i < active_nr && !strcmp(ce->name,
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active_cache[i]->name))
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i++;
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}
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}
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}
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return !clean;
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}
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/*
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* If we are cherry-pick, and if the merge did not result in
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* hand-editing, we will hit this commit and inherit the original
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* author date and name.
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* If we are revert, or if our cherry-pick results in a hand merge,
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* we had better say that the current user is responsible for that.
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*/
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static int run_git_commit(const char *defmsg, struct replay_opts *opts)
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{
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/* 6 is max possible length of our args array including NULL */
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const char *args[6];
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int i = 0;
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args[i++] = "commit";
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args[i++] = "-n";
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if (opts->signoff)
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args[i++] = "-s";
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if (!opts->edit) {
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args[i++] = "-F";
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args[i++] = defmsg;
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}
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args[i] = NULL;
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return run_command_v_opt(args, RUN_GIT_CMD);
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}
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static int do_pick_commit(struct commit *commit, struct replay_opts *opts)
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{
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unsigned char head[20];
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struct commit *base, *next, *parent;
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const char *base_label, *next_label;
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struct commit_message msg = { NULL, NULL, NULL, NULL, NULL };
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char *defmsg = NULL;
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struct strbuf msgbuf = STRBUF_INIT;
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int res;
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if (opts->no_commit) {
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/*
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* We do not intend to commit immediately. We just want to
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* merge the differences in, so let's compute the tree
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* that represents the "current" state for merge-recursive
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* to work on.
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*/
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if (write_cache_as_tree(head, 0, NULL))
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die (_("Your index file is unmerged."));
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} else {
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if (get_sha1("HEAD", head))
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die (_("You do not have a valid HEAD"));
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if (index_differs_from("HEAD", 0))
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die_dirty_index(opts);
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}
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discard_cache();
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if (!commit->parents) {
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parent = NULL;
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}
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else if (commit->parents->next) {
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/* Reverting or cherry-picking a merge commit */
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int cnt;
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struct commit_list *p;
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if (!opts->mainline)
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die(_("Commit %s is a merge but no -m option was given."),
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sha1_to_hex(commit->object.sha1));
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for (cnt = 1, p = commit->parents;
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cnt != opts->mainline && p;
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cnt++)
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p = p->next;
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if (cnt != opts->mainline || !p)
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die(_("Commit %s does not have parent %d"),
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sha1_to_hex(commit->object.sha1), opts->mainline);
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parent = p->item;
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} else if (0 < opts->mainline)
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die(_("Mainline was specified but commit %s is not a merge."),
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sha1_to_hex(commit->object.sha1));
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else
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parent = commit->parents->item;
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if (opts->allow_ff && parent && !hashcmp(parent->object.sha1, head))
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return fast_forward_to(commit->object.sha1, head);
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if (parent && parse_commit(parent) < 0)
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/* TRANSLATORS: The first %s will be "revert" or
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"cherry-pick", the second %s a SHA1 */
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die(_("%s: cannot parse parent commit %s"),
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action_name(opts), sha1_to_hex(parent->object.sha1));
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if (get_message(commit, &msg) != 0)
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die(_("Cannot get commit message for %s"),
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sha1_to_hex(commit->object.sha1));
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/*
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* "commit" is an existing commit. We would want to apply
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* the difference it introduces since its first parent "prev"
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* on top of the current HEAD if we are cherry-pick. Or the
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* reverse of it if we are revert.
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*/
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defmsg = git_pathdup("MERGE_MSG");
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if (opts->action == REVERT) {
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base = commit;
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base_label = msg.label;
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next = parent;
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next_label = msg.parent_label;
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strbuf_addstr(&msgbuf, "Revert \"");
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strbuf_addstr(&msgbuf, msg.subject);
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strbuf_addstr(&msgbuf, "\"\n\nThis reverts commit ");
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strbuf_addstr(&msgbuf, sha1_to_hex(commit->object.sha1));
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if (commit->parents && commit->parents->next) {
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strbuf_addstr(&msgbuf, ", reversing\nchanges made to ");
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strbuf_addstr(&msgbuf, sha1_to_hex(parent->object.sha1));
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}
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strbuf_addstr(&msgbuf, ".\n");
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} else {
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const char *p;
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base = parent;
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base_label = msg.parent_label;
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next = commit;
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next_label = msg.label;
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/*
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* Append the commit log message to msgbuf; it starts
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* after the tree, parent, author, committer
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* information followed by "\n\n".
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*/
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p = strstr(msg.message, "\n\n");
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if (p) {
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p += 2;
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strbuf_addstr(&msgbuf, p);
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}
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if (opts->record_origin) {
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|
strbuf_addstr(&msgbuf, "(cherry picked from commit ");
|
|
strbuf_addstr(&msgbuf, sha1_to_hex(commit->object.sha1));
|
|
strbuf_addstr(&msgbuf, ")\n");
|
|
}
|
|
if (!opts->no_commit)
|
|
write_cherry_pick_head(commit);
|
|
}
|
|
|
|
if (!opts->strategy || !strcmp(opts->strategy, "recursive") || opts->action == REVERT) {
|
|
res = do_recursive_merge(base, next, base_label, next_label,
|
|
head, &msgbuf, opts);
|
|
write_message(&msgbuf, defmsg);
|
|
} else {
|
|
struct commit_list *common = NULL;
|
|
struct commit_list *remotes = NULL;
|
|
|
|
write_message(&msgbuf, defmsg);
|
|
|
|
commit_list_insert(base, &common);
|
|
commit_list_insert(next, &remotes);
|
|
res = try_merge_command(opts->strategy, opts->xopts_nr, opts->xopts,
|
|
common, sha1_to_hex(head), remotes);
|
|
free_commit_list(common);
|
|
free_commit_list(remotes);
|
|
}
|
|
|
|
if (res) {
|
|
error(opts->action == REVERT
|
|
? _("could not revert %s... %s")
|
|
: _("could not apply %s... %s"),
|
|
find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV),
|
|
msg.subject);
|
|
print_advice();
|
|
rerere(opts->allow_rerere_auto);
|
|
} else {
|
|
if (!opts->no_commit)
|
|
res = run_git_commit(defmsg, opts);
|
|
}
|
|
|
|
free_message(&msg);
|
|
free(defmsg);
|
|
|
|
return res;
|
|
}
|
|
|
|
static void prepare_revs(struct rev_info *revs, struct replay_opts *opts)
|
|
{
|
|
int argc;
|
|
|
|
init_revisions(revs, NULL);
|
|
revs->no_walk = 1;
|
|
if (opts->action != REVERT)
|
|
revs->reverse = 1;
|
|
|
|
argc = setup_revisions(opts->commit_argc, opts->commit_argv, revs, NULL);
|
|
if (argc > 1)
|
|
usage(*revert_or_cherry_pick_usage(opts));
|
|
|
|
if (prepare_revision_walk(revs))
|
|
die(_("revision walk setup failed"));
|
|
|
|
if (!revs->commits)
|
|
die(_("empty commit set passed"));
|
|
}
|
|
|
|
static void read_and_refresh_cache(struct replay_opts *opts)
|
|
{
|
|
static struct lock_file index_lock;
|
|
int index_fd = hold_locked_index(&index_lock, 0);
|
|
if (read_index_preload(&the_index, NULL) < 0)
|
|
die(_("git %s: failed to read the index"), action_name(opts));
|
|
refresh_index(&the_index, REFRESH_QUIET|REFRESH_UNMERGED, NULL, NULL, NULL);
|
|
if (the_index.cache_changed) {
|
|
if (write_index(&the_index, index_fd) ||
|
|
commit_locked_index(&index_lock))
|
|
die(_("git %s: failed to refresh the index"), action_name(opts));
|
|
}
|
|
rollback_lock_file(&index_lock);
|
|
}
|
|
|
|
static int revert_or_cherry_pick(int argc, const char **argv,
|
|
struct replay_opts *opts)
|
|
{
|
|
struct rev_info revs;
|
|
struct commit *commit;
|
|
|
|
git_config(git_default_config, NULL);
|
|
setenv(GIT_REFLOG_ACTION, action_name(opts), 0);
|
|
parse_args(argc, argv, opts);
|
|
|
|
if (opts->allow_ff) {
|
|
if (opts->signoff)
|
|
die(_("cherry-pick --ff cannot be used with --signoff"));
|
|
if (opts->no_commit)
|
|
die(_("cherry-pick --ff cannot be used with --no-commit"));
|
|
if (opts->record_origin)
|
|
die(_("cherry-pick --ff cannot be used with -x"));
|
|
if (opts->edit)
|
|
die(_("cherry-pick --ff cannot be used with --edit"));
|
|
}
|
|
|
|
read_and_refresh_cache(opts);
|
|
|
|
prepare_revs(&revs, opts);
|
|
|
|
while ((commit = get_revision(&revs))) {
|
|
int res = do_pick_commit(commit, opts);
|
|
if (res)
|
|
return res;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cmd_revert(int argc, const char **argv, const char *prefix)
|
|
{
|
|
struct replay_opts opts;
|
|
|
|
memset(&opts, 0, sizeof(opts));
|
|
if (isatty(0))
|
|
opts.edit = 1;
|
|
opts.action = REVERT;
|
|
return revert_or_cherry_pick(argc, argv, &opts);
|
|
}
|
|
|
|
int cmd_cherry_pick(int argc, const char **argv, const char *prefix)
|
|
{
|
|
struct replay_opts opts;
|
|
|
|
memset(&opts, 0, sizeof(opts));
|
|
opts.action = CHERRY_PICK;
|
|
return revert_or_cherry_pick(argc, argv, &opts);
|
|
}
|