#include "builtin.h"

#include "cache.h"

#include "exec_cmd.h"

#include "help.h"

#include "quote.h"

#include "run-command.h"

#include "commit.h"

const char git_usage_string[] =

"git [--version] [--help] [-C <path>] [-c name=value]\n"

" [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n"

" [-p|--paginate|--no-pager] [--no-replace-objects] [--bare]\n"

" [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]\n"

" <command> [<args>]";

const char git_more_info_string[] =

N_("'git help -a' and 'git help -g' lists available subcommands and some\n"

"concept guides. See 'git help <command>' or 'git help <concept>'\n"

"to read about a specific subcommand or concept.");

static struct startup_info git_startup_info;

static int use_pager = -1;

static void commit_pager_choice(void) {

switch (use_pager) {

case 0:

setenv("GIT_PAGER", "cat", 1);

break;

case 1:

setup_pager();

break;

default:

break;

}

}

static int handle_options(const char ***argv, int *argc, int *envchanged)

{

const char **orig_argv = *argv;

while (*argc > 0) {

const char *cmd = (*argv)[0];

if (cmd[0] != '-')

break;

/*

* For legacy reasons, the "version" and "help"

* commands can be written with "--" prepended

* to make them look like flags.

*/

if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))

break;

/*

* Check remaining flags.

*/

if (starts_with(cmd, "--exec-path")) {

cmd += 11;

if (*cmd == '=')

git_set_argv_exec_path(cmd + 1);

else {

puts(git_exec_path());

exit(0);

}

} else if (!strcmp(cmd, "--html-path")) {

puts(system_path(GIT_HTML_PATH));

exit(0);

} else if (!strcmp(cmd, "--man-path")) {

puts(system_path(GIT_MAN_PATH));

exit(0);

} else if (!strcmp(cmd, "--info-path")) {

puts(system_path(GIT_INFO_PATH));

exit(0);

} else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {

use_pager = 1;

} else if (!strcmp(cmd, "--no-pager")) {

use_pager = 0;

if (envchanged)

*envchanged = 1;

} else if (!strcmp(cmd, "--no-replace-objects")) {

check_replace_refs = 0;

setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);

if (envchanged)

*envchanged = 1;

} else if (!strcmp(cmd, "--git-dir")) {

if (*argc < 2) {

fprintf(stderr, "No directory given for --git-dir.\n" );

usage(git_usage_string);

}

setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);

if (envchanged)

*envchanged = 1;

(*argv)++;

(*argc)--;

} else if (starts_with(cmd, "--git-dir=")) {

setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);

if (envchanged)

*envchanged = 1;

} else if (!strcmp(cmd, "--namespace")) {

if (*argc < 2) {

fprintf(stderr, "No namespace given for --namespace.\n" );

usage(git_usage_string);

}

setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);

if (envchanged)

*envchanged = 1;

(*argv)++;

(*argc)--;

} else if (starts_with(cmd, "--namespace=")) {

setenv(GIT_NAMESPACE_ENVIRONMENT, cmd + 12, 1);

if (envchanged)

*envchanged = 1;

} else if (!strcmp(cmd, "--work-tree")) {

if (*argc < 2) {

fprintf(stderr, "No directory given for --work-tree.\n" );

usage(git_usage_string);

}

setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);

if (envchanged)

*envchanged = 1;

(*argv)++;

(*argc)--;

} else if (starts_with(cmd, "--work-tree=")) {

setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);

if (envchanged)

*envchanged = 1;

} else if (!strcmp(cmd, "--bare")) {

static char git_dir[PATH_MAX+1];

is_bare_repository_cfg = 1;

setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);

setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);

if (envchanged)

*envchanged = 1;

} else if (!strcmp(cmd, "-c")) {

if (*argc < 2) {

fprintf(stderr, "-c expects a configuration string\n" );

usage(git_usage_string);

}

git_config_push_parameter((*argv)[1]);

(*argv)++;

(*argc)--;

} else if (!strcmp(cmd, "--literal-pathspecs")) {

setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);

if (envchanged)

*envchanged = 1;

} else if (!strcmp(cmd, "--no-literal-pathspecs")) {

setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);

if (envchanged)

*envchanged = 1;

} else if (!strcmp(cmd, "--glob-pathspecs")) {

setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);

if (envchanged)

*envchanged = 1;

} else if (!strcmp(cmd, "--noglob-pathspecs")) {

setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);

if (envchanged)

*envchanged = 1;

} else if (!strcmp(cmd, "--icase-pathspecs")) {

setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);

if (envchanged)

*envchanged = 1;

} else if (!strcmp(cmd, "--shallow-file")) {

(*argv)++;

(*argc)--;

set_alternate_shallow_file((*argv)[0], 1);

if (envchanged)

*envchanged = 1;

} else if (!strcmp(cmd, "-C")) {

if (*argc < 2) {

fprintf(stderr, "No directory given for -C.\n" );

usage(git_usage_string);

}

if (chdir((*argv)[1]))

die_errno("Cannot change to '%s'", (*argv)[1]);

if (envchanged)

*envchanged = 1;

(*argv)++;

(*argc)--;

} else {

fprintf(stderr, "Unknown option: %s\n", cmd);

usage(git_usage_string);

}

(*argv)++;

(*argc)--;

}

return (*argv) - orig_argv;

}

static int handle_alias(int *argcp, const char ***argv)

{

int envchanged = 0, ret = 0, saved_errno = errno;

const char *subdir;

int count, option_count;

const char **new_argv;

const char *alias_command;

char *alias_string;

int unused_nongit;

subdir = setup_git_directory_gently(&unused_nongit);

alias_command = (*argv)[0];

alias_string = alias_lookup(alias_command);

if (alias_string) {

if (alias_string[0] == '!') {

const char **alias_argv;

int argc = *argcp, i;

commit_pager_choice();

/* build alias_argv */

alias_argv = xmalloc(sizeof(*alias_argv) * (argc + 1));

alias_argv[0] = alias_string + 1;

for (i = 1; i < argc; ++i)

alias_argv[i] = (*argv)[i];

alias_argv[argc] = NULL;

ret = run_command_v_opt(alias_argv, RUN_USING_SHELL);

if (ret >= 0) /* normal exit */

exit(ret);

die_errno("While expanding alias '%s': '%s'",

alias_command, alias_string + 1);

}

count = split_cmdline(alias_string, &new_argv);

if (count < 0)

die("Bad alias.%s string: %s", alias_command,

split_cmdline_strerror(count));

option_count = handle_options(&new_argv, &count, &envchanged);

if (envchanged)

die("alias '%s' changes environment variables\n"

"You can use '!git' in the alias to do this.",

alias_command);

memmove(new_argv - option_count, new_argv,

count * sizeof(char *));

new_argv -= option_count;

if (count < 1)

die("empty alias for %s", alias_command);

if (!strcmp(alias_command, new_argv[0]))

die("recursive alias: %s", alias_command);

trace_argv_printf(new_argv,

"trace: alias expansion: %s =>",

alias_command);

new_argv = xrealloc(new_argv, sizeof(char *) *

(count + *argcp));

/* insert after command name */

memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);

*argv = new_argv;

*argcp += count - 1;

ret = 1;

}

if (subdir && chdir(subdir))

die_errno("Cannot change to '%s'", subdir);

errno = saved_errno;

return ret;

}

#define RUN_SETUP (1<<0)

#define RUN_SETUP_GENTLY (1<<1)

#define USE_PAGER (1<<2)

/*

* require working tree to be present -- anything uses this needs

* RUN_SETUP for reading from the configuration file.

*/

#define NEED_WORK_TREE (1<<3)

struct cmd_struct {

};

static int run_builtin(struct cmd_struct *p, int argc, const char **argv)

{

int status, help;

struct stat st;

const char *prefix;

prefix = NULL;

help = argc == 2 && !strcmp(argv[1], "-h");

if (!help) {

if (p->option & RUN_SETUP)

prefix = setup_git_directory();

else if (p->option & RUN_SETUP_GENTLY) {

int nongit_ok;

prefix = setup_git_directory_gently(&nongit_ok);

}

if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))

use_pager = check_pager_config(p->cmd);

if (use_pager == -1 && p->option & USE_PAGER)

use_pager = 1;

if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&

startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */

trace_repo_setup(prefix);

}

commit_pager_choice();

if (!help && p->option & NEED_WORK_TREE)

setup_work_tree();

trace_argv_printf(argv, "trace: built-in: git");

status = p->fn(argc, argv, prefix);

if (status)

return status;

/* Somebody closed stdout? */

if (fstat(fileno(stdout), &st))

return 0;

/* Ignore write errors for pipes and sockets.. */

if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))

return 0;

/* Check for ENOSPC and EIO errors.. */

if (fflush(stdout))

die_errno("write failure on standard output");

if (ferror(stdout))

die("unknown write failure on standard output");

if (fclose(stdout))

die_errno("close failed on standard output");

return 0;

}

static struct cmd_struct commands[] = {

{ "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },

{ "annotate", cmd_annotate, RUN_SETUP },

{ "apply", cmd_apply, RUN_SETUP_GENTLY },

{ "archive", cmd_archive },

{ "bisect--helper", cmd_bisect__helper, RUN_SETUP },

{ "blame", cmd_blame, RUN_SETUP },

{ "branch", cmd_branch, RUN_SETUP },

{ "bundle", cmd_bundle, RUN_SETUP_GENTLY },

{ "cat-file", cmd_cat_file, RUN_SETUP },

{ "check-attr", cmd_check_attr, RUN_SETUP },

{ "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },

{ "check-mailmap", cmd_check_mailmap, RUN_SETUP },

{ "check-ref-format", cmd_check_ref_format },

{ "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },

{ "checkout-index", cmd_checkout_index,

RUN_SETUP | NEED_WORK_TREE},

{ "cherry", cmd_cherry, RUN_SETUP },

{ "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },

{ "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },

{ "clone", cmd_clone },

{ "column", cmd_column, RUN_SETUP_GENTLY },

{ "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },

{ "commit-tree", cmd_commit_tree, RUN_SETUP },

{ "config", cmd_config, RUN_SETUP_GENTLY },

{ "count-objects", cmd_count_objects, RUN_SETUP },

{ "credential", cmd_credential, RUN_SETUP_GENTLY },

{ "describe", cmd_describe, RUN_SETUP },

{ "diff", cmd_diff },

{ "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },

{ "diff-index", cmd_diff_index, RUN_SETUP },

{ "diff-tree", cmd_diff_tree, RUN_SETUP },

{ "fast-export", cmd_fast_export, RUN_SETUP },

{ "fetch", cmd_fetch, RUN_SETUP },

{ "fetch-pack", cmd_fetch_pack, RUN_SETUP },

{ "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },

{ "for-each-ref", cmd_for_each_ref, RUN_SETUP },

{ "format-patch", cmd_format_patch, RUN_SETUP },

{ "fsck", cmd_fsck, RUN_SETUP },

{ "fsck-objects", cmd_fsck, RUN_SETUP },

{ "gc", cmd_gc, RUN_SETUP },

{ "get-tar-commit-id", cmd_get_tar_commit_id },

{ "grep", cmd_grep, RUN_SETUP_GENTLY },

{ "hash-object", cmd_hash_object },

{ "help", cmd_help },

{ "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },

{ "init", cmd_init_db },

{ "init-db", cmd_init_db },

{ "log", cmd_log, RUN_SETUP },

{ "ls-files", cmd_ls_files, RUN_SETUP },

{ "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },

{ "ls-tree", cmd_ls_tree, RUN_SETUP },

{ "mailinfo", cmd_mailinfo },

{ "mailsplit", cmd_mailsplit },

{ "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },

{ "merge-base", cmd_merge_base, RUN_SETUP },

{ "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },

{ "merge-index", cmd_merge_index, RUN_SETUP },

{ "merge-ours", cmd_merge_ours, RUN_SETUP },

{ "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },

{ "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },

{ "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },

{ "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },

{ "merge-tree", cmd_merge_tree, RUN_SETUP },

{ "mktag", cmd_mktag, RUN_SETUP },

{ "mktree", cmd_mktree, RUN_SETUP },

{ "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },

{ "name-rev", cmd_name_rev, RUN_SETUP },

{ "notes", cmd_notes, RUN_SETUP },

{ "pack-objects", cmd_pack_objects, RUN_SETUP },

{ "pack-redundant", cmd_pack_redundant, RUN_SETUP },

{ "pack-refs", cmd_pack_refs, RUN_SETUP },

{ "patch-id", cmd_patch_id },

{ "pickaxe", cmd_blame, RUN_SETUP },

{ "prune", cmd_prune, RUN_SETUP },

{ "prune-packed", cmd_prune_packed, RUN_SETUP },

{ "push", cmd_push, RUN_SETUP },

{ "read-tree", cmd_read_tree, RUN_SETUP },

{ "receive-pack", cmd_receive_pack },

{ "reflog", cmd_reflog, RUN_SETUP },

{ "remote", cmd_remote, RUN_SETUP },

{ "remote-ext", cmd_remote_ext },

{ "remote-fd", cmd_remote_fd },

{ "repack", cmd_repack, RUN_SETUP },

{ "replace", cmd_replace, RUN_SETUP },

{ "rerere", cmd_rerere, RUN_SETUP },

{ "reset", cmd_reset, RUN_SETUP },

{ "rev-list", cmd_rev_list, RUN_SETUP },

{ "rev-parse", cmd_rev_parse },

{ "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },

{ "rm", cmd_rm, RUN_SETUP },

{ "send-pack", cmd_send_pack, RUN_SETUP },

{ "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },

{ "show", cmd_show, RUN_SETUP },

{ "show-branch", cmd_show_branch, RUN_SETUP },

{ "show-ref", cmd_show_ref, RUN_SETUP },

{ "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },

{ "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },

{ "stripspace", cmd_stripspace },

{ "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },

{ "tag", cmd_tag, RUN_SETUP },

{ "unpack-file", cmd_unpack_file, RUN_SETUP },

{ "unpack-objects", cmd_unpack_objects, RUN_SETUP },

{ "update-index", cmd_update_index, RUN_SETUP },

{ "update-ref", cmd_update_ref, RUN_SETUP },

{ "update-server-info", cmd_update_server_info, RUN_SETUP },

{ "upload-archive", cmd_upload_archive },

{ "upload-archive--writer", cmd_upload_archive_writer },

{ "var", cmd_var, RUN_SETUP_GENTLY },

{ "verify-pack", cmd_verify_pack },

{ "verify-tag", cmd_verify_tag, RUN_SETUP },

{ "version", cmd_version },

{ "whatchanged", cmd_whatchanged, RUN_SETUP },

{ "write-tree", cmd_write_tree, RUN_SETUP },

};

int is_builtin(const char *s)

{

int i;

for (i = 0; i < ARRAY_SIZE(commands); i++) {

struct cmd_struct *p = commands+i;

if (!strcmp(s, p->cmd))

return 1;

}

return 0;

}

static void handle_builtin(int argc, const char **argv)

{

const char *cmd = argv[0];

int i;

static const char ext[] = STRIP_EXTENSION;

if (sizeof(ext) > 1) {

i = strlen(argv[0]) - strlen(ext);

if (i > 0 && !strcmp(argv[0] + i, ext)) {

char *argv0 = xstrdup(argv[0]);

argv[0] = cmd = argv0;

argv0[i] = '\0';

}

}

/* Turn "git cmd --help" into "git help cmd" */

if (argc > 1 && !strcmp(argv[1], "--help")) {

argv[1] = argv[0];

argv[0] = cmd = "help";

}

for (i = 0; i < ARRAY_SIZE(commands); i++) {

struct cmd_struct *p = commands+i;

if (strcmp(p->cmd, cmd))

continue;

exit(run_builtin(p, argc, argv));

}

}

static void execv_dashed_external(const char **argv)

{

struct strbuf cmd = STRBUF_INIT;

const char *tmp;

int status;

if (use_pager == -1)

use_pager = check_pager_config(argv[0]);

commit_pager_choice();

strbuf_addf(&cmd, "git-%s", argv[0]);

/*

* argv[0] must be the git command, but the argv array

* belongs to the caller, and may be reused in

* subsequent loop iterations. Save argv[0] and

* restore it on error.

*/

tmp = argv[0];

argv[0] = cmd.buf;

trace_argv_printf(argv, "trace: exec:");

/*

* if we fail because the command is not found, it is

* OK to return. Otherwise, we just pass along the status code.

*/

status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT);

if (status >= 0 || errno != ENOENT)

exit(status);

argv[0] = tmp;

strbuf_release(&cmd);

}

static int run_argv(int *argcp, const char ***argv)

{

int done_alias = 0;

while (1) {

/* See if it's a builtin */

handle_builtin(*argcp, *argv);

/* .. then try the external ones */

execv_dashed_external(*argv);

/* It could be an alias -- this works around the insanity

* of overriding "git log" with "git show" by having

* alias.log = show

*/

if (done_alias || !handle_alias(argcp, argv))

break;

done_alias = 1;

}

return done_alias;

}

int main(int argc, char **av)

{

const char **argv = (const char **) av;

const char *cmd;

startup_info = &git_startup_info;

cmd = git_extract_argv0_path(argv[0]);

if (!cmd)

cmd = "git-help";

/*

* Always open file descriptors 0/1/2 to avoid clobbering files

* in die(). It also avoids messing up when the pipes are dup'ed

* onto stdin/stdout/stderr in the child processes we spawn.

*/

sanitize_stdfds();

git_setup_gettext();

/*

* "git-xxxx" is the same as "git xxxx", but we obviously:

*

* - cannot take flags in between the "git" and the "xxxx".

* - cannot execute it externally (since it would just do

* the same thing over again)

*

* So we just directly call the builtin handler, and die if

* that one cannot handle it.

*/

if (starts_with(cmd, "git-")) {

cmd += 4;

argv[0] = cmd;

handle_builtin(argc, argv);

die("cannot handle %s as a builtin", cmd);

}

/* Look for flags.. */

argv++;

argc--;

handle_options(&argv, &argc, NULL);

if (argc > 0) {

if (starts_with(argv[0], "--"))

argv[0] += 2;

} else {

/* The user didn't specify a command; give them help */

commit_pager_choice();

printf("usage: %s\n\n", git_usage_string);

list_common_cmds_help();

printf("\n%s\n", _(git_more_info_string));

exit(1);

}

cmd = argv[0];

/*

* We use PATH to find git commands, but we prepend some higher

* precedence paths: the "--exec-path" option, the GIT_EXEC_PATH

* environment, and the $(gitexecdir) from the Makefile at build

* time.

*/

setup_path();

while (1) {

static int done_help = 0;

static int was_alias = 0;

was_alias = run_argv(&argc, &argv);

if (errno != ENOENT)

break;

if (was_alias) {

fprintf(stderr, "Expansion of alias '%s' failed; "

"'%s' is not a git command\n",

cmd, argv[0]);

exit(1);

}

if (!done_help) {

cmd = argv[0] = help_unknown_cmd(cmd);

done_help = 1;

} else

break;

}

fprintf(stderr, "Failed to run command '%s': %s\n",

cmd, strerror(errno));

return 1;

}