sbin/hammer/cmd_config.c

   1 /*
   2  * Copyright (c) 2009 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include "hammer.h"
  36
  37 static void config_get(const char *dirpath, struct hammer_ioc_config *config);
  38 static void config_set(const char *dirpath, struct hammer_ioc_config *config);
  39 static void config_remove_path(void);
  40
  41 static char *ConfigPath;
  42
  43 /*
  44  * hammer config [<fs> [configfile]]
  45  *
  46  * Prints out the hammer cleanup configuration for the specified HAMMER
  47  * filesystem(s) or the current filesystem.
  48  */
  49 void
  50 hammer_cmd_config(char **av, int ac)
  51 {
  52         struct hammer_ioc_config config;
  53         char *dirpath;
  54         ssize_t n;
  55         int fd;
  56
  57         bzero(&config, sizeof(config));
  58         if (ac == 0) {
  59                 config_get(".", &config);
  60                 if (config.head.error == 0) {
  61                         printf("%s", config.config.text);
  62                 } else {
  63                         errx(2, "hammer config: no configuration found");
  64                         /* not reached */
  65                 }
  66                 return;
  67         }
  68         dirpath = av[0];
  69         if (ac == 1) {
  70                 config_get(dirpath, &config);
  71                 if (config.head.error == 0) {
  72                         printf("%s", config.config.text);
  73                 } else {
  74                         errx(2, "hammer config: no configuration found");
  75                         /* not reached */
  76                 }
  77                 return;
  78         }
  79         config_get(dirpath, &config);   /* ignore errors */
  80         config.head.error = 0;
  81
  82         fd = open(av[1], O_RDONLY);
  83         if (fd < 0) {
  84                 err(2, "hammer config: %s", av[1]);
  85                 /* not reached */
  86         }
  87         n = read(fd, config.config.text, sizeof(config.config.text) - 1);
  88         if (n == sizeof(config.config.text) - 1) {
  89                 err(2, "hammer config: config file too big, limit %zu bytes",
  90                     sizeof(config.config.text) - 1);
  91                 /* not reached */
  92         }
  93         bzero(config.config.text + n, sizeof(config.config.text) - n);
  94         config_set(dirpath, &config);
  95         close(fd);
  96 }
  97
  98 /*
  99  * hammer viconfig [<fs>]
 100  */
 101 void
 102 hammer_cmd_viconfig(char **av, int ac)
 103 {
 104         struct hammer_ioc_config config;
 105         struct timeval times[2];
 106         const char *dirpath;
 107         struct stat st;
 108         char *runcmd, *editor, *tmp;
 109         char path[32];
 110         ssize_t n;
 111         int fd;
 112
 113         if (ac > 1) {
 114                 errx(1, "hammer viconfig: 0 or 1 argument (<fs>) only");
 115                 /* not reached */
 116         }
 117         if (ac == 0)
 118                 dirpath = ".";
 119         else
 120                 dirpath = av[0];
 121         config_get(dirpath, &config);
 122         if (config.head.error == ENOENT) {
 123                 snprintf(config.config.text, sizeof(config.config.text),
 124                         "%s",
 125                         "# No configuration present, here are some defaults\n"
 126                         "# you can uncomment.  Also remove these instructions\n"
 127                         "#\n"
 128                         "#snapshots 1d 60d\n"
 129                         "#prune     1d 5m\n"
 130                         "#rebalance 1d 5m\n"
 131                         "#dedup     1d 5m\n"
 132                         "#reblock   1d 5m\n"
 133                         "#recopy    30d 10m\n");
 134                 config.head.error = 0;
 135         }
 136         if (config.head.error) {
 137                 errx(2, "hammer viconfig: read config failed error: %s",
 138                         strerror(config.head.error));
 139                 /* not reached */
 140         }
 141
 142         /*
 143          * Edit a temporary file and write back if it was modified.
 144          * Adjust the mtime back one second so a quick edit is not
 145          * improperly detected as not having been modified.
 146          */
 147         snprintf(path, sizeof(path), "/tmp/configXXXXXXXXXX");
 148         mkstemp(path);
 149         ConfigPath = path;
 150         atexit(config_remove_path);
 151
 152         fd = open(path, O_RDWR|O_CREAT|O_TRUNC, 0600);
 153         if (fd < 0)
 154                 err(2, "hammer viconfig: creating temporary file %s", path);
 155         write(fd, config.config.text, strlen(config.config.text));
 156         if (fstat(fd, &st) < 0)
 157                 err(2, "hammer viconfig");
 158         times[0].tv_sec = st.st_mtime - 1;
 159         times[0].tv_usec = 0;
 160         times[1] = times[0];
 161         close(fd);
 162         utimes(path, times);
 163
 164         if ((tmp = getenv("EDITOR")) != NULL ||
 165             (tmp = getenv("VISUAL")) != NULL)
 166                 editor = strdup(tmp);
 167         else
 168                 editor = strdup("vi");
 169
 170         asprintf(&runcmd, "%s %s", editor, path);
 171         system(runcmd);
 172
 173         if (stat(path, &st) < 0)
 174                 err(2, "hammer viconfig: unable to stat file after vi");
 175         if (times[0].tv_sec == st.st_mtime) {
 176                 printf("hammer viconfig: no changes were made\n");
 177                 remove(path);
 178                 return;
 179         }
 180         fd = open(path, O_RDONLY);
 181         if (fd < 0)
 182                 err(2, "hammer viconfig: unable to read %s", path);
 183         remove(path);
 184         n = read(fd, config.config.text, sizeof(config.config.text) - 1);
 185         if (n < 0)
 186                 err(2, "hammer viconfig: unable to read %s", path);
 187         if (n == sizeof(config.config.text) - 1) {
 188                 err(2, "hammer config: config file too big, limit %zu bytes",
 189                     sizeof(config.config.text) - 1);
 190                 /* not reached */
 191         }
 192         bzero(config.config.text + n, sizeof(config.config.text) - n);
 193         config_set(dirpath, &config);
 194         free(editor);
 195         free(runcmd);
 196 }
 197
 198 static void
 199 config_get(const char *dirpath, struct hammer_ioc_config *config)
 200 {
 201         struct hammer_ioc_version version;
 202         int fd;
 203
 204         bzero(&version, sizeof(version));
 205         if ((fd = open(dirpath, O_RDONLY)) < 0)
 206                 err(2, "hammer config: unable to open directory %s", dirpath);
 207         if (ioctl(fd, HAMMERIOC_GET_VERSION, &version) < 0)
 208                 errx(2, "hammer config: not a HAMMER filesystem!");
 209         if (ioctl(fd, HAMMERIOC_GET_CONFIG, config) < 0)
 210                 errx(2, "hammer config: config_get");
 211         close(fd);
 212 }
 213
 214 static void
 215 config_set(const char *dirpath, struct hammer_ioc_config *config)
 216 {
 217         struct hammer_ioc_version version;
 218         int fd;
 219
 220         bzero(&version, sizeof(version));
 221         if ((fd = open(dirpath, O_RDONLY)) < 0)
 222                 errx(2, "hammer config: unable to open directory %s", dirpath);
 223         if (ioctl(fd, HAMMERIOC_GET_VERSION, &version) < 0)
 224                 errx(2, "hammer config: not a HAMMER filesystem!");
 225         if (ioctl(fd, HAMMERIOC_SET_CONFIG, config) < 0)
 226                 err(2, "hammer config");
 227         close(fd);
 228 }
 229
 230 static void
 231 config_remove_path(void)
 232 {
 233         remove(ConfigPath);
 234 }