mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-09 08:00:13 +00:00
010ceab56e
Preparatory work to support more global options. The current parser abuses the subcommand table to understand help and version when specified as options (--). These are now special case when processing the global options. Signed-off-by: David Sterba <dsterba@suse.com>
308 lines
6.7 KiB
C
308 lines
6.7 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <getopt.h>
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#include "volumes.h"
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#include "crc32c.h"
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#include "commands.h"
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#include "utils.h"
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#include "help.h"
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static const char * const btrfs_cmd_group_usage[] = {
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"btrfs [--help] [--version] <group> [<group>...] <command> [<args>]",
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NULL
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};
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static const char btrfs_cmd_group_info[] =
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"Use --help as an argument for information on a specific group or command.";
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static inline const char *skip_prefix(const char *str, const char *prefix)
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{
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size_t len = strlen(prefix);
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return strncmp(str, prefix, len) ? NULL : str + len;
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}
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static int parse_one_token(const char *arg, const struct cmd_group *grp,
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const struct cmd_struct **cmd_ret)
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{
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const struct cmd_struct *cmd = grp->commands;
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const struct cmd_struct *abbrev_cmd = NULL, *ambiguous_cmd = NULL;
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for (; cmd->token; cmd++) {
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const char *rest;
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rest = skip_prefix(arg, cmd->token);
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if (!rest) {
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if (!prefixcmp(cmd->token, arg)) {
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if (abbrev_cmd) {
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/*
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* If this is abbreviated, it is
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* ambiguous. So when there is no
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* exact match later, we need to
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* error out.
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*/
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ambiguous_cmd = abbrev_cmd;
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}
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abbrev_cmd = cmd;
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}
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continue;
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}
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if (*rest)
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continue;
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*cmd_ret = cmd;
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return 0;
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}
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if (ambiguous_cmd)
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return -2;
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if (abbrev_cmd) {
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*cmd_ret = abbrev_cmd;
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return 0;
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}
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return -1;
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}
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static const struct cmd_struct *
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parse_command_token(const char *arg, const struct cmd_group *grp)
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{
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const struct cmd_struct *cmd = NULL;
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switch(parse_one_token(arg, grp, &cmd)) {
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case -1:
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help_unknown_token(arg, grp);
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case -2:
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help_ambiguous_token(arg, grp);
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}
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return cmd;
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}
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static void handle_help_options_next_level(const struct cmd_struct *cmd,
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int argc, char **argv)
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{
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if (argc < 2)
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return;
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if (!strcmp(argv[1], "--help")) {
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if (cmd->next) {
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argc--;
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argv++;
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help_command_group(cmd->next, argc, argv);
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} else {
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usage_command(cmd, 1, 0);
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}
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exit(0);
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}
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}
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int handle_command_group(const struct cmd_group *grp, int argc,
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char **argv)
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{
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const struct cmd_struct *cmd;
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argc--;
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argv++;
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if (argc < 1) {
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usage_command_group(grp, 0, 0);
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exit(1);
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}
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cmd = parse_command_token(argv[0], grp);
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handle_help_options_next_level(cmd, argc, argv);
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fixup_argv0(argv, cmd->token);
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return cmd->fn(argc, argv);
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}
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static const struct cmd_group btrfs_cmd_group;
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static const char * const cmd_help_usage[] = {
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"btrfs help [--full]",
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"Display help information",
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"",
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"--full display detailed help on every command",
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NULL
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};
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static int cmd_help(int argc, char **argv)
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{
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help_command_group(&btrfs_cmd_group, argc, argv);
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return 0;
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}
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static const char * const cmd_version_usage[] = {
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"btrfs version",
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"Display btrfs-progs version",
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NULL
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};
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static int cmd_version(int argc, char **argv)
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{
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printf("%s\n", PACKAGE_STRING);
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return 0;
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}
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/*
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* Parse global options, between binary name and first non-option argument
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* after processing all valid options (including those with arguments).
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*
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* Returns index to argv where parsting stopped, optind is reset to 1
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*/
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static int handle_global_options(int argc, char **argv)
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{
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enum { OPT_HELP = 256, OPT_VERSION, OPT_FULL };
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static const struct option long_options[] = {
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{ "help", no_argument, NULL, OPT_HELP },
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{ "version", no_argument, NULL, OPT_VERSION },
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{ "full", no_argument, NULL, OPT_FULL },
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{ NULL, 0, NULL, 0}
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};
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int shift;
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if (argc == 0)
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return 0;
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opterr = 0;
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while (1) {
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int c;
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c = getopt_long(argc, argv, "+", long_options, NULL);
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if (c < 0)
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break;
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switch (c) {
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case OPT_HELP: break;
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case OPT_VERSION: break;
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case OPT_FULL: break;
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default:
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fprintf(stderr, "Unknown global option: %s\n",
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argv[optind - 1]);
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exit(129);
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}
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}
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shift = optind;
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optind = 1;
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return shift;
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}
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void handle_special_globals(int shift, int argc, char **argv)
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{
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int has_help = 0;
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int has_full = 0;
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int i;
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for (i = 0; i < shift; i++) {
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if (strcmp(argv[i], "--help") == 0)
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has_help = 1;
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else if (strcmp(argv[i], "--full") == 0)
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has_full = 1;
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}
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if (has_help) {
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if (has_full)
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usage_command_group(&btrfs_cmd_group, 1, 0);
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else
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cmd_help(argc, argv);
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exit(0);
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}
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for (i = 0; i < shift; i++)
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if (strcmp(argv[i], "--version") == 0) {
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cmd_version(argc, argv);
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exit(0);
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}
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}
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static const struct cmd_group btrfs_cmd_group = {
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btrfs_cmd_group_usage, btrfs_cmd_group_info, {
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{ "subvolume", cmd_subvolume, NULL, &subvolume_cmd_group, 0 },
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{ "filesystem", cmd_filesystem, NULL, &filesystem_cmd_group, 0 },
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{ "balance", cmd_balance, NULL, &balance_cmd_group, 0 },
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{ "device", cmd_device, NULL, &device_cmd_group, 0 },
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{ "scrub", cmd_scrub, NULL, &scrub_cmd_group, 0 },
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{ "check", cmd_check, cmd_check_usage, NULL, 0 },
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{ "rescue", cmd_rescue, NULL, &rescue_cmd_group, 0 },
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{ "restore", cmd_restore, cmd_restore_usage, NULL, 0 },
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{ "inspect-internal", cmd_inspect, NULL, &inspect_cmd_group, 0 },
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{ "property", cmd_property, NULL, &property_cmd_group, 0 },
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{ "send", cmd_send, cmd_send_usage, NULL, 0 },
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{ "receive", cmd_receive, cmd_receive_usage, NULL, 0 },
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{ "quota", cmd_quota, NULL, "a_cmd_group, 0 },
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{ "qgroup", cmd_qgroup, NULL, &qgroup_cmd_group, 0 },
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{ "replace", cmd_replace, NULL, &replace_cmd_group, 0 },
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{ "help", cmd_help, cmd_help_usage, NULL, 0 },
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{ "version", cmd_version, cmd_version_usage, NULL, 0 },
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NULL_CMD_STRUCT
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},
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};
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int main(int argc, char **argv)
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{
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const struct cmd_struct *cmd;
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const char *bname;
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int ret;
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btrfs_config_init();
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if ((bname = strrchr(argv[0], '/')) != NULL)
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bname++;
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else
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bname = argv[0];
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if (!strcmp(bname, "btrfsck")) {
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argv[0] = "check";
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} else {
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int shift;
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shift = handle_global_options(argc, argv);
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handle_special_globals(shift, argc, argv);
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while (shift-- > 0) {
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argc--;
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argv++;
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}
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if (argc == 0) {
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usage_command_group_short(&btrfs_cmd_group);
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exit(1);
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}
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}
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cmd = parse_command_token(argv[0], &btrfs_cmd_group);
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handle_help_options_next_level(cmd, argc, argv);
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crc32c_optimization_init();
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fixup_argv0(argv, cmd->token);
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ret = cmd->fn(argc, argv);
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btrfs_close_all_devices();
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exit(ret);
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}
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