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_find_newer
, 2, "subvolume find-new", "<path> <last_gen>\n"
65 "List the recently modified files in a filesystem."
68 "filesystem defragment", "[-vcf] [-s start] [-l len] [-t size] <file>|<dir> [<file>|<dir>...]\n"
69 "Defragment a file or a directory."
71 { do_set_default_subvol
, 2,
72 "subvolume set-default", "<id> <path>\n"
73 "Set the subvolume of the filesystem <path> which will be mounted\n"
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", "[<uuid>|<label>]\n"
87 "Show the info of a btrfs filesystem. If no <uuid> or <label>\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\n."
95 "filesystem balance", "<path>\n"
96 "Balance the chunks across the device."
99 999, "device scan", "[<device> [<device>..]\n"
100 "Scan all device for or the passed device for a btrfs\n"
104 "device add", "<dev> [<dev>..] <path>\n"
105 "Add a device to a filesystem."
107 { do_remove_volume
, -2,
108 "device delete", "<dev> [<dev>..] <path>\n"
109 "Remove a device from a filesystem."
112 { 2, "filesystem label", "<label> <path>\n"
113 "Set the label of a filesystem"
119 static char *get_prgname(char *programname
)
122 np
= strrchr(programname
,'/');
131 static void print_help(char *programname
, struct Command
*cmd
)
135 printf("\t%s %s ", programname
, cmd
->verb
);
137 for(pc
= cmd
->help
; *pc
; pc
++){
145 static void help(char *np
)
150 for( cp
= commands
; cp
->verb
; cp
++ )
153 printf("\n\t%s help|--help|-h\n\t\tShow the help.\n",np
);
154 printf("\n%s\n", BTRFS_BUILD_VERSION
);
157 static int split_command(char *cmd
, char ***commands
)
162 for( *commands
= 0, l
= c
= 0, p
= s
= cmd
; ; p
++, l
++ ){
163 if ( *p
&& *p
!= ' ' )
166 /* c + 2 so that we have room for the null */
167 (*commands
) = realloc( (*commands
), sizeof(char *)*(c
+ 2));
168 (*commands
)[c
] = strndup(s
, l
);
180 This function checks if the passed command is ambiguous
182 static int check_ambiguity(struct Command
*cmd
, char **argv
){
185 /* check for ambiguity */
186 for( i
= 0 ; i
< cmd
->ncmds
; i
++ ){
188 for( match
= 0, cp
= commands
; cp
->verb
; cp
++ ){
195 for( skip
= 0, j
= 0 ; j
< i
; j
++ )
196 if( strcmp(cmd
->cmds
[j
], cp
->cmds
[j
])){
203 if( !strcmp(cmd
->cmds
[i
], cp
->cmds
[i
]))
205 for(s2
= cp
->cmds
[i
], s1
= argv
[i
+1];
206 *s1
== *s2
&& *s1
; s1
++, s2
++ ) ;
212 fprintf(stderr
, "ERROR: in command '");
213 for( j
= 0 ; j
<= i
; j
++ )
214 fprintf(stderr
, "%s%s",j
?" ":"", argv
[j
+1]);
215 fprintf(stderr
, "', '%s' is ambiguous\n",argv
[j
]);
223 * This function, compacts the program name and the command in the first
224 * element of the '*av' array
226 static int prepare_args(int *ac
, char ***av
, char *prgname
, struct Command
*cmd
){
232 ret
= (char **)malloc(sizeof(char*)*(*ac
+1));
233 newname
= (char*)malloc(strlen(prgname
)+strlen(cmd
->verb
)+2);
234 if( !ret
|| !newname
){
241 for(i
=0; i
< *ac
; i
++ )
244 strcpy(newname
, prgname
);
245 strcat(newname
, " ");
246 strcat(newname
, cmd
->verb
);
259 This function perform the following jobs:
260 - show the help if '--help' or 'help' or '-h' are passed
261 - verify that a command is not ambiguous, otherwise show which
262 part of the command is ambiguous
263 - if after a (even partial) command there is '--help' show the help
264 for all the matching commands
265 - if the command doesn't' match show an error
266 - finally, if a command match, they return which command is matched and
269 The function return 0 in case of help is requested; <0 in case
270 of uncorrect command; >0 in case of matching commands
271 argc, argv are the arg-counter and arg-vector (input)
272 *nargs_ is the number of the arguments after the command (output)
273 **cmd_ is the invoked command (output)
274 ***args_ are the arguments after the command
277 static int parse_args(int argc
, char **argv
,
278 CommandFunction
*func_
,
279 int *nargs_
, char **cmd_
, char ***args_
)
282 struct Command
*matchcmd
=0;
283 char *prgname
= get_prgname(argv
[0]);
284 int i
=0, helprequested
=0;
286 if( argc
< 2 || !strcmp(argv
[1], "help") ||
287 !strcmp(argv
[1], "-h") || !strcmp(argv
[1], "--help")){
292 for( cp
= commands
; cp
->verb
; cp
++ )
294 cp
->ncmds
= split_command(cp
->verb
, &(cp
->cmds
));
296 for( cp
= commands
; cp
->verb
; cp
++ ){
299 if( argc
-1 < cp
->ncmds
)
301 for( match
= 1, i
= 0 ; i
< cp
->ncmds
; i
++ ){
306 for(s2
= cp
->cmds
[i
], s1
= argv
[i
+1];
315 /* If you understand why this code works ...
316 you are a genious !! */
317 if(argc
>i
+1 && !strcmp(argv
[i
+1],"--help")){
320 print_help(prgname
, cp
);
329 *nargs_
= argc
-matchcmd
->ncmds
-1;
330 *cmd_
= matchcmd
->verb
;
331 *args_
= argv
+matchcmd
->ncmds
+1;
338 printf("\n%s\n", BTRFS_BUILD_VERSION
);
343 fprintf( stderr
, "ERROR: unknown command '%s'\n",argv
[1]);
348 if(check_ambiguity(matchcmd
, argv
))
351 /* check the number of argument */
352 if (matchcmd
->nargs
< 0 && matchcmd
->nargs
< -*nargs_
){
353 fprintf(stderr
, "ERROR: '%s' requires minimum %d arg(s)\n",
354 matchcmd
->verb
, -matchcmd
->nargs
);
357 if(matchcmd
->nargs
>= 0 && matchcmd
->nargs
!= *nargs_
&& matchcmd
->nargs
!= 999){
358 fprintf(stderr
, "ERROR: '%s' requires %d arg(s)\n",
359 matchcmd
->verb
, matchcmd
->nargs
);
363 if (prepare_args( nargs_
, args_
, prgname
, matchcmd
)){
364 fprintf(stderr
, "ERROR: not enough memory\\n");
371 int main(int ac
, char **av
)
374 char *cmd
=0, **args
=0;
376 CommandFunction func
=0;
378 r
= parse_args(ac
, av
, &func
, &nargs
, &cmd
, &args
);
380 /* error or no command to parse*/
384 exit(func(nargs
, args
));