btrfs-progs/btrfs.c

311 lines
6.4 KiB
C

/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include "volumes.h"
#include "crc32c.h"
#include "commands.h"
#include "utils.h"
#include "help.h"
static const char * const btrfs_cmd_group_usage[] = {
"btrfs [--help] [--version] <group> [<group>...] <command> [<args>]",
NULL
};
static const char btrfs_cmd_group_info[] =
"Use --help as an argument for information on a specific group or command.";
static inline const char *skip_prefix(const char *str, const char *prefix)
{
size_t len = strlen(prefix);
return strncmp(str, prefix, len) ? NULL : str + len;
}
static int parse_one_token(const char *arg, const struct cmd_group *grp,
const struct cmd_struct **cmd_ret)
{
const struct cmd_struct *abbrev_cmd = NULL, *ambiguous_cmd = NULL;
int i = 0;
for (i = 0; grp->commands[i]; i++) {
const struct cmd_struct *cmd = grp->commands[i];
const char *rest;
rest = skip_prefix(arg, cmd->token);
if (!rest) {
if (!prefixcmp(cmd->token, arg)) {
if (abbrev_cmd) {
/*
* If this is abbreviated, it is
* ambiguous. So when there is no
* exact match later, we need to
* error out.
*/
ambiguous_cmd = abbrev_cmd;
}
abbrev_cmd = cmd;
}
continue;
}
if (*rest)
continue;
*cmd_ret = cmd;
return 0;
}
if (ambiguous_cmd)
return -2;
if (abbrev_cmd) {
*cmd_ret = abbrev_cmd;
return 0;
}
return -1;
}
static const struct cmd_struct *
parse_command_token(const char *arg, const struct cmd_group *grp)
{
const struct cmd_struct *cmd = NULL;
switch(parse_one_token(arg, grp, &cmd)) {
case -1:
help_unknown_token(arg, grp);
case -2:
help_ambiguous_token(arg, grp);
}
return cmd;
}
static void handle_help_options_next_level(const struct cmd_struct *cmd,
int argc, char **argv)
{
if (argc < 2)
return;
if (!strcmp(argv[1], "--help")) {
if (cmd->next) {
argc--;
argv++;
help_command_group(cmd->next, argc, argv);
} else {
usage_command(cmd, true, false);
}
exit(0);
}
}
int handle_command_group(const struct cmd_struct *cmd, int argc,
char **argv)
{
const struct cmd_struct *subcmd;
argc--;
argv++;
if (argc < 1) {
usage_command_group(cmd->next, false, false);
exit(1);
}
subcmd = parse_command_token(argv[0], cmd->next);
handle_help_options_next_level(subcmd, argc, argv);
fixup_argv0(argv, subcmd->token);
return cmd_execute(subcmd, argc, argv);
}
static const struct cmd_group btrfs_cmd_group;
static const char * const cmd_help_usage[] = {
"btrfs help [--full]",
"Display help information",
"",
"--full display detailed help on every command",
NULL
};
static int cmd_help(const struct cmd_struct *unused, int argc, char **argv)
{
help_command_group(&btrfs_cmd_group, argc, argv);
return 0;
}
static DEFINE_SIMPLE_COMMAND(help, "help");
static const char * const cmd_version_usage[] = {
"btrfs version",
"Display btrfs-progs version",
NULL
};
static int cmd_version(const struct cmd_struct *unused, int argc, char **argv)
{
printf("%s\n", PACKAGE_STRING);
return 0;
}
static DEFINE_SIMPLE_COMMAND(version, "version");
/*
* Parse global options, between binary name and first non-option argument
* after processing all valid options (including those with arguments).
*
* Returns index to argv where parsing stopped, optind is reset to 1
*/
static int handle_global_options(int argc, char **argv)
{
enum { OPT_HELP = 256, OPT_VERSION, OPT_FULL };
static const struct option long_options[] = {
{ "help", no_argument, NULL, OPT_HELP },
{ "version", no_argument, NULL, OPT_VERSION },
{ "full", no_argument, NULL, OPT_FULL },
{ NULL, 0, NULL, 0}
};
int shift;
if (argc == 0)
return 0;
opterr = 0;
while (1) {
int c;
c = getopt_long(argc, argv, "+", long_options, NULL);
if (c < 0)
break;
switch (c) {
case OPT_HELP: break;
case OPT_VERSION: break;
case OPT_FULL: break;
default:
fprintf(stderr, "Unknown global option: %s\n",
argv[optind - 1]);
exit(129);
}
}
shift = optind;
optind = 1;
return shift;
}
static void handle_special_globals(int shift, int argc, char **argv)
{
bool has_help = false;
bool has_full = false;
int i;
for (i = 0; i < shift; i++) {
if (strcmp(argv[i], "--help") == 0)
has_help = true;
else if (strcmp(argv[i], "--full") == 0)
has_full = true;
}
if (has_help) {
if (has_full)
usage_command_group(&btrfs_cmd_group, true, false);
else
cmd_execute(&cmd_struct_help, argc, argv);
exit(0);
}
for (i = 0; i < shift; i++)
if (strcmp(argv[i], "--version") == 0) {
cmd_execute(&cmd_struct_version, argc, argv);
exit(0);
}
}
static const struct cmd_group btrfs_cmd_group = {
btrfs_cmd_group_usage, btrfs_cmd_group_info, {
&cmd_struct_subvolume,
&cmd_struct_filesystem,
&cmd_struct_balance,
&cmd_struct_device,
&cmd_struct_scrub,
&cmd_struct_check,
&cmd_struct_rescue,
&cmd_struct_restore,
&cmd_struct_inspect,
&cmd_struct_property,
&cmd_struct_send,
&cmd_struct_receive,
&cmd_struct_quota,
&cmd_struct_qgroup,
&cmd_struct_replace,
&cmd_struct_help,
&cmd_struct_version,
NULL
},
};
int main(int argc, char **argv)
{
const struct cmd_struct *cmd;
const char *bname;
int ret;
btrfs_config_init();
if ((bname = strrchr(argv[0], '/')) != NULL)
bname++;
else
bname = argv[0];
if (!strcmp(bname, "btrfsck")) {
argv[0] = "check";
} else {
int shift;
shift = handle_global_options(argc, argv);
handle_special_globals(shift, argc, argv);
while (shift-- > 0) {
argc--;
argv++;
}
if (argc == 0) {
usage_command_group_short(&btrfs_cmd_group);
exit(1);
}
}
cmd = parse_command_token(argv[0], &btrfs_cmd_group);
handle_help_options_next_level(cmd, argc, argv);
crc32c_optimization_init();
fixup_argv0(argv, cmd->token);
ret = cmd_execute(cmd, argc, argv);
btrfs_close_all_devices();
exit(ret);
}