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3296 post 1
/* Copyright (c) 2008, Tim Post <tinkertim@gmail.com>
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 * All rights reserved.
3277 post 3
 *
3296 post 4
 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions are met:
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 *
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 * Redistributions of source code must retain the above copyright notice, this
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 * list of conditions and the following disclaimer.
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 *
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 * Redistributions in binary form must reproduce the above copyright notice,
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 * this list of conditions and the following disclaimer in the documentation
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 * and/or other materials provided with the distribution.
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 *
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 * Neither the name of the original program's authors nor the names of its
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 * contributors may be used to endorse or promote products derived from this
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 * software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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 * POSSIBILITY OF SUCH DAMAGE.
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 */
3277 post 30
 
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#include <stdio.h>
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#include <stdlib.h>
3296 post 33
#include <unistd.h>
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#include <fcntl.h>
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#include <dirent.h>
3337 post 36
#include <assert.h>
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#include <getopt.h>
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3296 post 39
#include "config.h"
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#include "errors.h"
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#include "util.h"
3277 post 42
#include "entry.h"
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#include "rm.h"
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#include "cmds.h"
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static char *cmdname = "rm";
3337 post 47
#define RM_VERSION "0.0.1"
3277 post 48
 
3337 post 49
static rm_job_t rm;
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3375 post 51
static struct option const long_options[] = {
3338 post 52
    { "help", no_argument, 0, 'h' },
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    { "version", no_argument, 0, 'v' },
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    { "recursive", no_argument, 0, 'r' },
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    { "force", no_argument, 0, 'f' },
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    { "safe", no_argument, 0, 's' },
3337 post 57
    { 0, 0, 0, 0 }
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};
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3364 post 60
static unsigned int rm_start(rm_job_t *rm)
3337 post 61
{
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    rm->recursive = 0;
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    rm->force = 0;
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    rm->safe = 0;
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    /* Make sure we can allocate enough memory to store
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     * what is needed in the job structure */
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    if (NULL == (rm->nwd = (char *) malloc(PATH_MAX)))
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        return 0;
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    memset(rm->nwd, 0, sizeof(rm->nwd));
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72
    if (NULL == (rm->owd = (char *) malloc(PATH_MAX)))
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        return 0;
74
    memset(rm->owd, 0, sizeof(rm->owd));
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76
    if (NULL == (rm->cwd = (char *) malloc(PATH_MAX)))
77
        return 0;
78
    memset(rm->cwd, 0, sizeof(rm->cwd));
79
 
80
    chdir(".");
81
 
82
    if (NULL == (getcwd(rm->owd, PATH_MAX)))
83
        return 0;
84
 
85
    return 1;
86
}
87
 
3364 post 88
static void rm_end(rm_job_t *rm)
3337 post 89
{
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    if (NULL != rm->nwd)
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        free(rm->nwd);
92
 
93
    if (NULL != rm->owd)
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        free(rm->owd);
95
 
96
    if (NULL != rm->cwd)
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        free(rm->cwd);
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99
    return;
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}
101
 
3364 post 102
static unsigned int rm_recursive(const char *path)
3296 post 103
{
3337 post 104
    int rc;
105
 
106
    /* First see if it will just go away */
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    rc = rmdir(path);
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    if (rc == 0)
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        return 0;
110
 
111
    /* Its not empty, recursively scan it */
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    cli_error(CL_ENOTSUP,
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        "Can not remove %s, directory not empty", path);
3296 post 114
    return 1;
115
}
116
 
3364 post 117
static unsigned int rm_single(const char *path)
3296 post 118
{
119
    if (unlink(path)) {
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        cli_error(CL_EFAIL, "rm: could not remove file %s", path);
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        return 1;
122
    }
123
    return 0;
124
}
125
 
3364 post 126
static unsigned int rm_scope(const char *path)
3296 post 127
{
128
    int fd;
129
    DIR *dirp;
130
 
131
    dirp = opendir(path);
132
    if (dirp) {
133
        closedir(dirp);
134
        return RM_DIR;
135
    }
136
 
137
    fd = open(path, O_RDONLY);
138
    if (fd > 0) {
139
        close(fd);
140
        return RM_FILE;
141
    }
142
 
143
    return RM_BOGUS;
144
}
145
 
3277 post 146
/* Dispays help for rm in various levels */
147
void * help_cmd_rm(unsigned int level)
148
{
3296 post 149
    if (level == HELP_SHORT) {
150
        printf("`%s' removes files and directories.\n", cmdname);
151
    } else {
152
        help_cmd_rm(HELP_SHORT);
3337 post 153
        printf(
154
        "Usage:  %s [options] <path>\n"
155
        "Options:\n"
156
        "  -h, --help       A short option summary\n"
157
        "  -v, --version    Print version information and exit\n"
158
        "  -r, --recursive  Recursively remove sub directories\n"
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        "  -f, --force      Do not prompt prior to removing files\n"
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        "  -s, --safe       Stop if directories change during removal\n\n"
161
        "Currently, %s is under development, some options don't work.\n",
162
        cmdname, cmdname);
3296 post 163
    }
164
    return CMD_VOID;
3277 post 165
}
166
 
167
/* Main entry point for rm, accepts an array of arguments */
168
int * cmd_rm(char **argv)
169
{
170
    unsigned int argc;
3296 post 171
    unsigned int i, scope, ret = 0;
3337 post 172
    int c, opt_ind;
173
    size_t len;
174
    char *buff = NULL;
3277 post 175
 
176
    for (argc = 0; argv[argc] != NULL; argc ++);
177
    if (argc < 2) {
3296 post 178
        cli_error(CL_EFAIL,
3337 post 179
            "%s: insufficient arguments. Try %s --help", cmdname, cmdname);
3296 post 180
        return CMD_FAILURE;
3277 post 181
    }
182
 
3337 post 183
    if (!rm_start(&rm)) {
184
        cli_error(CL_ENOMEM, "%s: could not initialize", cmdname);
185
        rm_end(&rm);
186
        return CMD_FAILURE;
187
    }
188
 
189
    for (c = 0, optind = 0, opt_ind = 0; c != -1;) {
190
        c = getopt_long(argc, argv, "hvrfs", long_options, &opt_ind);
191
        switch (c) {
192
        case 'h':
193
            help_cmd_rm(HELP_LONG);
194
            return CMD_SUCCESS;
195
        case 'v':
196
            printf("%s\n", RM_VERSION);
197
            return CMD_SUCCESS;
198
        case 'r':
199
            rm.recursive = 1;
200
            break;
201
        case 'f':
202
            rm.force = 1;
203
            break;
204
        case 's':
205
            rm.safe = 1;
206
            break;
207
        }
208
    }
209
 
210
    if (optind == argc) {
211
        cli_error(CL_EFAIL,
212
            "%s: insufficient arguments. Try %s --help", cmdname, cmdname);
213
        rm_end(&rm);
214
        return CMD_FAILURE;
215
    }
216
 
217
    i = optind;
218
    while (NULL != argv[i]) {
219
        len = strlen(argv[i]) + 2;
220
        buff = (char *) realloc(buff, len);
221
        assert(buff != NULL);
222
        memset(buff, 0, sizeof(buff));
223
        snprintf(buff, len, argv[i]);
224
 
3296 post 225
        scope = rm_scope(buff);
226
        switch (scope) {
3337 post 227
        case RM_BOGUS: /* FIXME */
3296 post 228
        case RM_FILE:
229
            ret += rm_single(buff);
230
            break;
231
        case RM_DIR:
3337 post 232
            if (! rm.recursive) {
233
                printf("%s is a directory, use -r to remove it.\n", buff);
234
                ret ++;
235
            } else {
236
                ret += rm_recursive(buff);
237
            }
3296 post 238
            break;
239
        }
3337 post 240
        i++;
3296 post 241
    }
3277 post 242
 
3337 post 243
    if (NULL != buff)
244
        free(buff);
245
 
246
    rm_end(&rm);
247
 
3296 post 248
    if (ret)
249
        return CMD_FAILURE;
250
    else
251
        return CMD_SUCCESS;
3277 post 252
}
253