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dmsetup: Add concise table output format.
Create a new table output format that concisely shows multiple devices on one line. dmsetup table --concise [device...] <dev_name>,<uuid>,<flags>[,<table>]*[;<dev_name>,<uuid>,<flags>[,<table>]*]* Table lines are separated by commas. Devices are separated by semi-colons. Flags is currently 'ro' or 'rw' (and might be extended in a yet-to-be-defined way in future). Any comma, semi-colon or backslash within a field is quoted by a preceding backslash. The format can later be supplied as input to dmsetup or even to the booting kernel as an alternative way to set up devices. Based on patches submitted by Enric Balletbo i Serra <enric.balletbo@collabora.com>.
This commit is contained in:
Alasdair G Kergon
parent
ca71ad0d50
commit
5fd7c0aa33
@ -1,5 +1,6 @@
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Version 1.02.143 -
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=================================
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Introduce single-line concise table output format: dmsetup table --concise
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Version 1.02.142 - 20th July 2017
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=================================
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@ -269,6 +269,7 @@ dmsetup \(em low level logical volume management
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.de CMD_TABLE
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. ad l
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. BR table
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. RB [ --concise ]
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. RB [ --target
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. IR target_type ]
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. RB [ --showkeys ]
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@ -824,6 +825,10 @@ Real encryption keys are suppressed in the table output for the crypt
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target unless the \fB--showkeys\fP parameter is supplied. Kernel key
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references prefixed with \fB:\fP are not affected by the parameter and get
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displayed always.
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With \fB--concise\fP, the output is presented concisely on a single line.
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Commas then separate the name, uuid, flags ('ro' or 'rw') and the table
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(if present). Semi-colons separate devices. Backslashes escape any commas,
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semi-colons or backslashes.
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.
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.HP
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.CMD_TARGETS
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@ -163,6 +163,7 @@ enum {
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AREA_ARG,
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AREAS_ARG,
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AREA_SIZE_ARG,
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CONCISE_ARG,
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BOUNDS_ARG,
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CHECKS_ARG,
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CLEAR_ARG,
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@ -273,6 +274,7 @@ static uint64_t _disp_factor = 512; /* display sizes in sectors */
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static char _disp_units = 's';
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const char *_program_id = DM_STATS_PROGRAM_ID; /* program_id used for reports. */
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static uint64_t _statstype = 0; /* stats objects to report */
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static int _concise_output_produced = 0; /* Was any concise output already printed? */
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/* string names for stats object types */
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const char *_stats_types[] = {
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@ -2114,6 +2116,19 @@ static int _exec_command(const char *name)
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return 1;
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}
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/*
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* Print string s using a backslash to quote each character that has a special
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* meaning in the concise format - comma, semi-colon and backslash.
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*/
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static void _print_string_quoted(const char *s)
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{
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while (*s) {
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if (strchr(",;\\", *s))
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putchar('\\');
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putchar(*s++);
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}
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}
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static int _status(CMD_ARGS)
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{
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int r = 0;
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@ -2126,6 +2141,7 @@ static int _status(CMD_ARGS)
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const char *name = NULL;
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int matched = 0;
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int ls_only = 0;
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int use_concise = 0;
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struct dm_info info;
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if (names)
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@ -2136,9 +2152,12 @@ static int _status(CMD_ARGS)
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name = argv[0];
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}
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if (!strcmp(cmd->name, "table"))
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if (!strcmp(cmd->name, "table")) {
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cmdno = DM_DEVICE_TABLE;
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else
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/* --concise only applies to 'table' */
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if (_switches[CONCISE_ARG])
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use_concise = 1;
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} else
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cmdno = DM_DEVICE_STATUS;
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if (!strcmp(cmd->name, "ls"))
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@ -2179,6 +2198,7 @@ static int _status(CMD_ARGS)
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if (_switches[TARGET_ARG] &&
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(!target_type || strcmp(target_type, _target)))
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continue;
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if (ls_only) {
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if (!_switches[EXEC_ARG] || !_command_to_exec ||
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_switches[VERBOSE_ARG])
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@ -2186,10 +2206,28 @@ static int _status(CMD_ARGS)
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next = NULL;
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} else if (!_switches[EXEC_ARG] || !_command_to_exec ||
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_switches[VERBOSE_ARG]) {
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if (!matched && _switches[VERBOSE_ARG])
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_display_info(dmt);
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if (multiple_devices && !_switches[VERBOSE_ARG])
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printf("%s: ", name);
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if (!use_concise) {
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if (!matched && _switches[VERBOSE_ARG])
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_display_info(dmt);
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if (multiple_devices && !_switches[VERBOSE_ARG])
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printf("%s: ", name);
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} else if (!matched) {
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/*
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* Before first target of device in concise output,
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* print basic device information in the appropriate format.
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* Separate devices by a semi-colon.
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*/
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if (_concise_output_produced)
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putchar(';');
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_concise_output_produced = 1;
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_print_string_quoted(name);
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putchar(',');
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_print_string_quoted(dm_task_get_uuid(dmt));
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putchar(',');
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printf("%s", info.read_only ? "ro" : "rw");
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}
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/* Next print any target-specific information */
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if (target_type) {
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/* Suppress encryption key */
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if (!_switches[SHOWKEYS_ARG] &&
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@ -2210,15 +2248,22 @@ static int _status(CMD_ARGS)
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while (*c && *c != ' ')
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*c++ = '0';
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}
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printf(FMTu64 " " FMTu64 " %s %s",
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start, length, target_type, params);
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if (use_concise)
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putchar(',');
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printf(FMTu64 " " FMTu64 " %s ", start, length, target_type);
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if (use_concise)
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_print_string_quoted(params);
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else
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printf("%s", params);
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}
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putchar('\n');
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/* --concise places all devices on a single output line */
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if (!use_concise)
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putchar('\n');
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}
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matched = 1;
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} while (next);
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if (multiple_devices && _switches[VERBOSE_ARG] && matched && !ls_only)
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if (multiple_devices && _switches[VERBOSE_ARG] && matched && !ls_only && (!use_concise || _switches[VERBOSE_ARG] > 1))
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putchar('\n');
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if (matched && _switches[EXEC_ARG] && _command_to_exec && !_exec_command(name))
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@ -5904,7 +5949,7 @@ static struct command _dmsetup_commands[] = {
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{"deps", "[-o <options>] [<device>...]", 0, -1, 1, 0, _deps},
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{"stats", "<command> [<options>] [<device>...]", 1, -1, 1, 1, _stats},
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{"status", "[<device>...] [--noflush] [--target <target_type>]", 0, -1, 1, 0, _status},
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{"table", "[<device>...] [--target <target_type>] [--showkeys]", 0, -1, 1, 0, _status},
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{"table", "[<device>...] [--concise] [--target <target_type>] [--showkeys]", 0, -1, 1, 0, _status},
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{"wait", "<device> [<event_nr>] [--noflush]", 0, 2, 0, 0, _wait},
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{"mknodes", "[<device>...]", 0, -1, 1, 0, _mknodes},
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{"mangle", "[<device>...]", 0, -1, 1, 0, _mangle},
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@ -6473,6 +6518,7 @@ static int _process_switches(int *argcp, char ***argvp, const char *dev_dir)
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{"checks", 0, &ind, CHECKS_ARG},
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{"clear", 0, &ind, CLEAR_ARG},
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{"columns", 0, &ind, COLS_ARG},
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{"concise", 0, &ind, CONCISE_ARG},
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{"count", 1, &ind, COUNT_ARG},
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{"deferred", 0, &ind, DEFERRED_ARG},
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{"select", 1, &ind, SELECT_ARG},
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@ -6637,6 +6683,8 @@ static int _process_switches(int *argcp, char ***argvp, const char *dev_dir)
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return_0;
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if (c == 'h' || ind == HELP_ARG)
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_switches[HELP_ARG]++;
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if (ind == CONCISE_ARG)
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_switches[CONCISE_ARG]++;
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if (ind == BOUNDS_ARG) {
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_switches[BOUNDS_ARG]++;
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_string_args[BOUNDS_ARG] = optarg;
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@ -7073,6 +7121,10 @@ doit:
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do {
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r = _perform_command_for_all_repeatable_args(cmd, subcommand, argc, argv, NULL, multiple_devices);
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if (_concise_output_produced) {
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putchar('\n');
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fflush(stdout);
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}
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if (_report) {
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/* only output headings for repeating reports */
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if (_int_args[COUNT_ARG] != 1 && !dm_report_is_empty(_report))
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