2 * This program is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU General Public
4 * License v2 as published by the Free Software Foundation.
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
9 * General Public License for more details.
11 * You should have received a copy of the GNU General Public
12 * License along with this program; if not, write to the
13 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
14 * Boston, MA 021110-1307, USA.
22 #include "kerncompat.h"
23 #include "btrfs_cmds.h"
26 typedef int (*CommandFunction)(int argc, char **argv);
29 CommandFunction func; /* function which implements the command */
30 int nargs; /* if == 999, any number of arguments
31 if >= 0, number of arguments,
32 if < 0, _minimum_ number of arguments */
33 char *verb; /* verb */
34 char *help; /* help lines; form the 2nd onward they are
37 /* the following fields are run-time filled by the program */
38 char **cmds; /* array of subcommands */
39 int ncmds; /* number of subcommand */
42 static struct Command commands[] = {
45 avoid short commands different for the case only
48 "subvolume snapshot", "<source> [<dest>/]<name>\n"
49 "Create a writable snapshot of the subvolume <source> with\n"
50 "the name <name> in the <dest> directory."
52 { do_delete_subvolume, 1,
53 "subvolume delete", "<subvolume>\n"
54 "Delete the subvolume <subvolume>."
56 { do_create_subvol, 1,
57 "subvolume create", "[<dest>/]<name>\n"
58 "Create a subvolume in <dest> (or the current directory if\n"
61 { do_subvol_list, 1, "subvolume list", "<path>\n"
62 "List the snapshot/subvolume of a filesystem."
64 { do_set_default_subvol, 2,
65 "subvolume set-default", "<id> <path>\n"
66 "Set the subvolume of the filesystem <path> which will be mounted\n"
69 { do_find_newer, 2, "subvolume find-new", "<path> <last_gen>\n"
70 "List the recently modified files in a filesystem."
73 "filesystem defragment", "[-vf] [-c[zlib,lzo]] [-s start] [-l len] [-t size] <file>|<dir> [<file>|<dir>...]\n"
74 "Defragment a file or a directory."
77 "filesystem sync", "<path>\n"
78 "Force a sync on the filesystem <path>."
81 "filesystem resize", "[+/-]<newsize>[gkm]|max <filesystem>\n"
82 "Resize the file system. If 'max' is passed, the filesystem\n"
83 "will occupe all available space on the device."
85 { do_show_filesystem, 999,
86 "filesystem show", "[<device>|<uuid>|<label>]\n"
87 "Show the info of a btrfs filesystem. If no argument\n"
88 "is passed, info of all the btrfs filesystem are shown."
90 { do_df_filesystem, 1,
91 "filesystem df", "<path>\n"
92 "Show space usage information for a mount point."
95 "filesystem balance", "<path>\n"
96 "Balance the chunks across the device."
99 "device scan", "[<device>...]\n"
100 "Scan all device for or the passed device for a btrfs\n"
104 "device add", "<device> [<device>...] <path>\n"
105 "Add a device to a filesystem."
107 { do_remove_volume, -2,
108 "device delete", "<device> [<device>...] <path>\n"
109 "Remove a device from a filesystem."
114 static char *get_prgname(char *programname)
117 np = strrchr(programname,'/');
126 static void print_help(char *programname, struct Command *cmd)
130 printf("\t%s %s ", programname, cmd->verb );
132 for(pc = cmd->help; *pc; pc++){
140 static void help(char *np)
145 for( cp = commands; cp->verb; cp++ )
148 printf("\n\t%s help|--help|-h\n\t\tShow the help.\n",np);
149 printf("\n%s\n", BTRFS_BUILD_VERSION);
152 static int split_command(char *cmd, char ***commands)
157 for( *commands = 0, l = c = 0, p = s = cmd ; ; p++, l++ ){
158 if ( *p && *p != ' ' )
161 /* c + 2 so that we have room for the null */
162 (*commands) = realloc( (*commands), sizeof(char *)*(c + 2));
163 (*commands)[c] = strndup(s, l);
175 This function checks if the passed command is ambiguous
177 static int check_ambiguity(struct Command *cmd, char **argv){
180 /* check for ambiguity */
181 for( i = 0 ; i < cmd->ncmds ; i++ ){
183 for( match = 0, cp = commands; cp->verb; cp++ ){
190 for( skip = 0, j = 0 ; j < i ; j++ )
191 if( strcmp(cmd->cmds[j], cp->cmds[j])){
198 if( !strcmp(cmd->cmds[i], cp->cmds[i]))
200 for(s2 = cp->cmds[i], s1 = argv[i+1];
201 *s1 == *s2 && *s1; s1++, s2++ ) ;
207 fprintf(stderr, "ERROR: in command '");
208 for( j = 0 ; j <= i ; j++ )
209 fprintf(stderr, "%s%s",j?" ":"", argv[j+1]);
210 fprintf(stderr, "', '%s' is ambiguous\n",argv[j]);
218 * This function, compacts the program name and the command in the first
219 * element of the '*av' array
221 static int prepare_args(int *ac, char ***av, char *prgname, struct Command *cmd ){
227 ret = (char **)malloc(sizeof(char*)*(*ac+1));
228 newname = (char*)malloc(strlen(prgname)+strlen(cmd->verb)+2);
229 if( !ret || !newname ){
236 for(i=0; i < *ac ; i++ )
239 strcpy(newname, prgname);
240 strcat(newname, " ");
241 strcat(newname, cmd->verb);
254 This function perform the following jobs:
255 - show the help if '--help' or 'help' or '-h' are passed
256 - verify that a command is not ambiguous, otherwise show which
257 part of the command is ambiguous
258 - if after a (even partial) command there is '--help' show the help
259 for all the matching commands
260 - if the command doesn't' match show an error
261 - finally, if a command match, they return which command is matched and
264 The function return 0 in case of help is requested; <0 in case
265 of uncorrect command; >0 in case of matching commands
266 argc, argv are the arg-counter and arg-vector (input)
267 *nargs_ is the number of the arguments after the command (output)
268 **cmd_ is the invoked command (output)
269 ***args_ are the arguments after the command
272 static int parse_args(int argc, char **argv,
273 CommandFunction *func_,
274 int *nargs_, char **cmd_, char ***args_ )
277 struct Command *matchcmd=0;
278 char *prgname = get_prgname(argv[0]);
279 int i=0, helprequested=0;
281 if( argc < 2 || !strcmp(argv[1], "help") ||
282 !strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")){
287 for( cp = commands; cp->verb; cp++ )
289 cp->ncmds = split_command(cp->verb, &(cp->cmds));
291 for( cp = commands; cp->verb; cp++ ){
294 if( argc-1 < cp->ncmds )
296 for( match = 1, i = 0 ; i < cp->ncmds ; i++ ){
301 for(s2 = cp->cmds[i], s1 = argv[i+1];
310 /* If you understand why this code works ...
311 you are a genious !! */
312 if(argc>i+1 && !strcmp(argv[i+1],"--help")){
315 print_help(prgname, cp);
324 *nargs_ = argc-matchcmd->ncmds-1;
325 *cmd_ = matchcmd->verb;
326 *args_ = argv+matchcmd->ncmds+1;
333 printf("\n%s\n", BTRFS_BUILD_VERSION);
338 fprintf( stderr, "ERROR: unknown command '%s'\n",argv[1]);
343 if(check_ambiguity(matchcmd, argv))
346 /* check the number of argument */
347 if (matchcmd->nargs < 0 && matchcmd->nargs < -*nargs_ ){
348 fprintf(stderr, "ERROR: '%s' requires minimum %d arg(s)\n",
349 matchcmd->verb, -matchcmd->nargs);
352 if(matchcmd->nargs >= 0 && matchcmd->nargs != *nargs_ && matchcmd->nargs != 999){
353 fprintf(stderr, "ERROR: '%s' requires %d arg(s)\n",
354 matchcmd->verb, matchcmd->nargs);
358 if (prepare_args( nargs_, args_, prgname, matchcmd )){
359 fprintf(stderr, "ERROR: not enough memory\\n");
366 int main(int ac, char **av )
369 char *cmd=0, **args=0;
371 CommandFunction func=0;
373 r = parse_args(ac, av, &func, &nargs, &cmd, &args);
375 /* error or no command to parse*/
379 exit(func(nargs, args));