1 | /*
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2 | Copyright (c) 2001-2006, Gerrit Pape
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3 | All rights reserved.
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4 |
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5 | Redistribution and use in source and binary forms, with or without
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6 | modification, are permitted provided that the following conditions are met:
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7 |
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8 | 1. Redistributions of source code must retain the above copyright notice,
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9 | this list of conditions and the following disclaimer.
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10 | 2. Redistributions in binary form must reproduce the above copyright
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11 | notice, this list of conditions and the following disclaimer in the
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12 | documentation and/or other materials provided with the distribution.
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13 | 3. The name of the author may not be used to endorse or promote products
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14 | derived from this software without specific prior written permission.
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15 |
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16 | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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17 | WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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18 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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19 | EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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20 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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21 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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22 | OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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23 | WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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24 | OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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25 | ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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26 | */
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27 |
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28 | /* Taken from http://smarden.sunsite.dk/runit/sv.8.html:
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29 |
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30 | sv - control and manage services monitored by runsv
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31 |
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32 | sv [-v] [-w sec] command services
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33 | /etc/init.d/service [-w sec] command
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34 |
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35 | The sv program reports the current status and controls the state of services
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36 | monitored by the runsv(8) supervisor.
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37 |
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38 | services consists of one or more arguments, each argument naming a directory
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39 | service used by runsv(8). If service doesn't start with a dot or slash,
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40 | it is searched in the default services directory /var/service/, otherwise
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41 | relative to the current directory.
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42 |
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43 | command is one of up, down, status, once, pause, cont, hup, alarm, interrupt,
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44 | 1, 2, term, kill, or exit, or start, stop, restart, shutdown, force-stop,
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45 | force-reload, force-restart, force-shutdown.
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46 |
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47 | The sv program can be sym-linked to /etc/init.d/ to provide an LSB init
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48 | script interface. The service to be controlled then is specified by the
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49 | base name of the "init script".
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50 |
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51 | status
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52 | Report the current status of the service, and the appendant log service
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53 | if available, to standard output.
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54 | up
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55 | If the service is not running, start it. If the service stops, restart it.
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56 | down
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57 | If the service is running, send it the TERM signal, and the CONT signal.
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58 | If ./run exits, start ./finish if it exists. After it stops, do not
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59 | restart service.
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60 | once
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61 | If the service is not running, start it. Do not restart it if it stops.
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62 | pause cont hup alarm interrupt quit 1 2 term kill
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63 | If the service is running, send it the STOP, CONT, HUP, ALRM, INT, QUIT,
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64 | USR1, USR2, TERM, or KILL signal respectively.
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65 | exit
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66 | If the service is running, send it the TERM signal, and the CONT signal.
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67 | Do not restart the service. If the service is down, and no log service
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68 | exists, runsv(8) exits. If the service is down and a log service exists,
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69 | send the TERM signal to the log service. If the log service is down,
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70 | runsv(8) exits. This command is ignored if it is given to an appendant
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71 | log service.
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72 |
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73 | sv actually looks only at the first character of above commands.
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74 |
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75 | Commands compatible to LSB init script actions:
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76 |
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77 | status
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78 | Same as status.
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79 | start
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80 | Same as up, but wait up to 7 seconds for the command to take effect.
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81 | Then report the status or timeout. If the script ./check exists in
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82 | the service directory, sv runs this script to check whether the service
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83 | is up and available; it's considered to be available if ./check exits
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84 | with 0.
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85 | stop
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86 | Same as down, but wait up to 7 seconds for the service to become down.
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87 | Then report the status or timeout.
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88 | restart
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89 | Send the commands term, cont, and up to the service, and wait up to
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90 | 7 seconds for the service to restart. Then report the status or timeout.
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91 | If the script ./check exists in the service directory, sv runs this script
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92 | to check whether the service is up and available again; it's considered
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93 | to be available if ./check exits with 0.
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94 | shutdown
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95 | Same as exit, but wait up to 7 seconds for the runsv(8) process
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96 | to terminate. Then report the status or timeout.
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97 | force-stop
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98 | Same as down, but wait up to 7 seconds for the service to become down.
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99 | Then report the status, and on timeout send the service the kill command.
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100 | force-reload
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101 | Send the service the term and cont commands, and wait up to
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102 | 7 seconds for the service to restart. Then report the status,
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103 | and on timeout send the service the kill command.
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104 | force-restart
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105 | Send the service the term, cont and up commands, and wait up to
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106 | 7 seconds for the service to restart. Then report the status, and
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107 | on timeout send the service the kill command. If the script ./check
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108 | exists in the service directory, sv runs this script to check whether
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109 | the service is up and available again; it's considered to be available
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110 | if ./check exits with 0.
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111 | force-shutdown
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112 | Same as exit, but wait up to 7 seconds for the runsv(8) process to
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113 | terminate. Then report the status, and on timeout send the service
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114 | the kill command.
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115 |
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116 | Additional Commands
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117 |
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118 | check
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119 | Check for the service to be in the state that's been requested. Wait up to
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120 | 7 seconds for the service to reach the requested state, then report
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121 | the status or timeout. If the requested state of the service is up,
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122 | and the script ./check exists in the service directory, sv runs
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123 | this script to check whether the service is up and running;
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124 | it's considered to be up if ./check exits with 0.
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125 |
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126 | Options
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127 |
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128 | -v
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129 | wait up to 7 seconds for the command to take effect.
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130 | Then report the status or timeout.
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131 | -w sec
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132 | Override the default timeout of 7 seconds with sec seconds. Implies -v.
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133 |
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134 | Environment
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135 |
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136 | SVDIR
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137 | The environment variable $SVDIR overrides the default services directory
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138 | /var/service.
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139 | SVWAIT
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140 | The environment variable $SVWAIT overrides the default 7 seconds to wait
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141 | for a command to take effect. It is overridden by the -w option.
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142 |
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143 | Exit Codes
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144 | sv exits 0, if the command was successfully sent to all services, and,
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145 | if it was told to wait, the command has taken effect to all services.
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146 |
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147 | For each service that caused an error (e.g. the directory is not
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148 | controlled by a runsv(8) process, or sv timed out while waiting),
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149 | sv increases the exit code by one and exits non zero. The maximum
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150 | is 99. sv exits 100 on error.
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151 | */
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152 |
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153 | /* Busyboxed by Denis Vlasenko <vda.linux@googlemail.com> */
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154 | /* TODO: depends on runit_lib.c - review and reduce/eliminate */
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155 |
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156 | #include <sys/poll.h>
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157 | #include <sys/file.h>
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158 | #include "libbb.h"
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159 | #include "runit_lib.h"
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160 |
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161 | static const char *acts;
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162 | static char **service;
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163 | static unsigned rc;
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164 | /* "Bernstein" time format: unix + 0x400000000000000aULL */
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165 | static uint64_t tstart, tnow;
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166 | svstatus_t svstatus;
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167 |
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168 |
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169 | static void fatal_cannot(const char *m1) ATTRIBUTE_NORETURN;
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170 | static void fatal_cannot(const char *m1)
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171 | {
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172 | bb_perror_msg("fatal: cannot %s", m1);
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173 | _exit(151);
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174 | }
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175 |
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176 | static void out(const char *p, const char *m1)
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177 | {
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178 | printf("%s%s: %s", p, *service, m1);
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179 | if (errno) {
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180 | printf(": %s", strerror(errno));
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181 | }
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182 | puts(""); /* will also flush the output */
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183 | }
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184 |
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185 | #define WARN "warning: "
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186 | #define OK "ok: "
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187 |
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188 | static void fail(const char *m1)
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189 | {
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190 | ++rc;
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191 | out("fail: ", m1);
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192 | }
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193 | static void failx(const char *m1)
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194 | {
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195 | errno = 0;
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196 | fail(m1);
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197 | }
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198 | static void warn(const char *m1)
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199 | {
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200 | ++rc;
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201 | /* "warning: <service>: <m1>\n" */
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202 | out("warning: ", m1);
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203 | }
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204 | static void ok(const char *m1)
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205 | {
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206 | errno = 0;
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207 | out(OK, m1);
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208 | }
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209 |
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210 | static int svstatus_get(void)
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211 | {
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212 | int fd, r;
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213 |
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214 | fd = open_write("supervise/ok");
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215 | if (fd == -1) {
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216 | if (errno == ENODEV) {
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217 | *acts == 'x' ? ok("runsv not running")
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218 | : failx("runsv not running");
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219 | return 0;
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220 | }
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221 | warn("cannot open supervise/ok");
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222 | return -1;
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223 | }
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224 | close(fd);
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225 | fd = open_read("supervise/status");
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226 | if (fd == -1) {
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227 | warn("cannot open supervise/status");
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228 | return -1;
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229 | }
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230 | r = read(fd, &svstatus, 20);
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231 | close(fd);
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232 | switch (r) {
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233 | case 20:
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234 | break;
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235 | case -1:
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236 | warn("cannot read supervise/status");
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237 | return -1;
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238 | default:
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239 | errno = 0;
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240 | warn("cannot read supervise/status: bad format");
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241 | return -1;
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242 | }
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243 | return 1;
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244 | }
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245 |
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246 | static unsigned svstatus_print(const char *m)
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247 | {
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248 | int diff;
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249 | int pid;
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250 | int normallyup = 0;
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251 | struct stat s;
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252 | uint64_t timestamp;
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253 |
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254 | if (stat("down", &s) == -1) {
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255 | if (errno != ENOENT) {
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256 | bb_perror_msg(WARN"cannot stat %s/down", *service);
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257 | return 0;
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258 | }
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259 | normallyup = 1;
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260 | }
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261 | pid = SWAP_LE32(svstatus.pid_le32);
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262 | timestamp = SWAP_BE64(svstatus.time_be64);
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263 | if (pid) {
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264 | switch (svstatus.run_or_finish) {
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265 | case 1: printf("run: "); break;
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266 | case 2: printf("finish: "); break;
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267 | }
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268 | printf("%s: (pid %d) ", m, pid);
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269 | } else {
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270 | printf("down: %s: ", m);
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271 | }
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272 | diff = tnow - timestamp;
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273 | printf("%us", (diff < 0 ? 0 : diff));
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274 | if (pid) {
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275 | if (!normallyup) printf(", normally down");
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276 | if (svstatus.paused) printf(", paused");
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277 | if (svstatus.want == 'd') printf(", want down");
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278 | if (svstatus.got_term) printf(", got TERM");
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279 | } else {
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280 | if (normallyup) printf(", normally up");
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281 | if (svstatus.want == 'u') printf(", want up");
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282 | }
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283 | return pid ? 1 : 2;
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284 | }
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285 |
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286 | static int status(const char *unused)
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287 | {
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288 | int r;
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289 |
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290 | r = svstatus_get();
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291 | switch (r) { case -1: case 0: return 0; }
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292 |
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293 | r = svstatus_print(*service);
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294 | if (chdir("log") == -1) {
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295 | if (errno != ENOENT) {
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296 | printf("; log: "WARN"cannot change to log service directory: %s",
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297 | strerror(errno));
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298 | }
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299 | } else if (svstatus_get()) {
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300 | printf("; ");
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301 | svstatus_print("log");
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302 | }
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303 | puts(""); /* will also flush the output */
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304 | return r;
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305 | }
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306 |
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307 | static int checkscript(void)
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308 | {
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309 | char *prog[2];
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310 | struct stat s;
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311 | int pid, w;
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312 |
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313 | if (stat("check", &s) == -1) {
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314 | if (errno == ENOENT) return 1;
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315 | bb_perror_msg(WARN"cannot stat %s/check", *service);
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316 | return 0;
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317 | }
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318 | /* if (!(s.st_mode & S_IXUSR)) return 1; */
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319 | prog[0] = (char*)"./check";
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320 | prog[1] = NULL;
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321 | pid = spawn(prog);
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322 | if (pid <= 0) {
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323 | bb_perror_msg(WARN"cannot %s child %s/check", "run", *service);
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324 | return 0;
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325 | }
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326 | while (wait_pid(&w, pid) == -1) {
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327 | if (errno == EINTR) continue;
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328 | bb_perror_msg(WARN"cannot %s child %s/check", "wait for", *service);
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329 | return 0;
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330 | }
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331 | return !wait_exitcode(w);
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332 | }
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333 |
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334 | static int check(const char *a)
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335 | {
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336 | int r;
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337 | unsigned pid;
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338 | uint64_t timestamp;
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339 |
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340 | r = svstatus_get();
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341 | if (r == -1)
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342 | return -1;
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343 | if (r == 0) {
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344 | if (*a == 'x')
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345 | return 1;
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346 | return -1;
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347 | }
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348 | pid = SWAP_LE32(svstatus.pid_le32);
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349 | switch (*a) {
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350 | case 'x':
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351 | return 0;
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352 | case 'u':
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353 | if (!pid || svstatus.run_or_finish != 1) return 0;
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354 | if (!checkscript()) return 0;
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355 | break;
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356 | case 'd':
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357 | if (pid) return 0;
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358 | break;
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359 | case 'c':
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360 | if (pid && !checkscript()) return 0;
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361 | break;
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362 | case 't':
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363 | if (!pid && svstatus.want == 'd') break;
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364 | timestamp = SWAP_BE64(svstatus.time_be64);
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365 | if ((tstart > timestamp) || !pid || svstatus.got_term || !checkscript())
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366 | return 0;
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367 | break;
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368 | case 'o':
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369 | timestamp = SWAP_BE64(svstatus.time_be64);
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370 | if ((!pid && tstart > timestamp) || (pid && svstatus.want != 'd'))
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371 | return 0;
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372 | }
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373 | printf(OK);
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374 | svstatus_print(*service);
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375 | puts(""); /* will also flush the output */
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376 | return 1;
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377 | }
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378 |
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379 | static int control(const char *a)
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380 | {
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381 | int fd, r;
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382 |
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383 | if (svstatus_get() <= 0)
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384 | return -1;
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385 | if (svstatus.want == *a)
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386 | return 0;
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387 | fd = open_write("supervise/control");
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388 | if (fd == -1) {
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389 | if (errno != ENODEV)
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390 | warn("cannot open supervise/control");
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391 | else
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392 | *a == 'x' ? ok("runsv not running") : failx("runsv not running");
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393 | return -1;
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394 | }
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395 | r = write(fd, a, strlen(a));
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396 | close(fd);
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397 | if (r != strlen(a)) {
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398 | warn("cannot write to supervise/control");
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399 | return -1;
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400 | }
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401 | return 1;
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402 | }
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403 |
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404 | int sv_main(int argc, char **argv);
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405 | int sv_main(int argc, char **argv)
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406 | {
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407 | unsigned opt;
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408 | unsigned i, want_exit;
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409 | char *x;
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410 | char *action;
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411 | const char *varservice = "/var/service/";
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412 | unsigned services;
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413 | char **servicex;
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414 | unsigned waitsec = 7;
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415 | smallint kll = 0;
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416 | smallint verbose = 0;
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417 | int (*act)(const char*);
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418 | int (*cbk)(const char*);
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419 | int curdir;
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420 |
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421 | xfunc_error_retval = 100;
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422 |
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423 | x = getenv("SVDIR");
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424 | if (x) varservice = x;
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425 | x = getenv("SVWAIT");
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426 | if (x) waitsec = xatou(x);
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427 |
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428 | opt = getopt32(argv, "w:v", &x);
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429 | if (opt & 1) waitsec = xatou(x); // -w
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430 | if (opt & 2) verbose = 1; // -v
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431 | argc -= optind;
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432 | argv += optind;
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433 | action = *argv++;
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434 | if (!action || !*argv) bb_show_usage();
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435 | service = argv;
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436 | services = argc - 1;
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437 |
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438 | tnow = time(0) + 0x400000000000000aULL;
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439 | tstart = tnow;
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440 | curdir = open_read(".");
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441 | if (curdir == -1)
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442 | fatal_cannot("open current directory");
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443 |
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444 | act = &control;
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445 | acts = "s";
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446 | cbk = ✓
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447 |
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448 | switch (*action) {
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449 | case 'x':
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450 | case 'e':
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451 | acts = "x";
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452 | if (!verbose) cbk = NULL;
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453 | break;
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454 | case 'X':
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455 | case 'E':
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456 | acts = "x";
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457 | kll = 1;
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458 | break;
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459 | case 'D':
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460 | acts = "d";
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461 | kll = 1;
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462 | break;
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463 | case 'T':
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464 | acts = "tc";
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465 | kll = 1;
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466 | break;
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467 | case 'c':
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468 | if (str_equal(action, "check")) {
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469 | act = NULL;
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470 | acts = "c";
|
---|
471 | break;
|
---|
472 | }
|
---|
473 | case 'u': case 'd': case 'o': case 't': case 'p': case 'h':
|
---|
474 | case 'a': case 'i': case 'k': case 'q': case '1': case '2':
|
---|
475 | action[1] = '\0';
|
---|
476 | acts = action;
|
---|
477 | if (!verbose) cbk = NULL;
|
---|
478 | break;
|
---|
479 | case 's':
|
---|
480 | if (str_equal(action, "shutdown")) {
|
---|
481 | acts = "x";
|
---|
482 | break;
|
---|
483 | }
|
---|
484 | if (str_equal(action, "start")) {
|
---|
485 | acts = "u";
|
---|
486 | break;
|
---|
487 | }
|
---|
488 | if (str_equal(action, "stop")) {
|
---|
489 | acts = "d";
|
---|
490 | break;
|
---|
491 | }
|
---|
492 | /* "status" */
|
---|
493 | act = &status;
|
---|
494 | cbk = NULL;
|
---|
495 | break;
|
---|
496 | case 'r':
|
---|
497 | if (str_equal(action, "restart")) {
|
---|
498 | acts = "tcu";
|
---|
499 | break;
|
---|
500 | }
|
---|
501 | bb_show_usage();
|
---|
502 | case 'f':
|
---|
503 | if (str_equal(action, "force-reload")) {
|
---|
504 | acts = "tc";
|
---|
505 | kll = 1;
|
---|
506 | break;
|
---|
507 | }
|
---|
508 | if (str_equal(action, "force-restart")) {
|
---|
509 | acts = "tcu";
|
---|
510 | kll = 1;
|
---|
511 | break;
|
---|
512 | }
|
---|
513 | if (str_equal(action, "force-shutdown")) {
|
---|
514 | acts = "x";
|
---|
515 | kll = 1;
|
---|
516 | break;
|
---|
517 | }
|
---|
518 | if (str_equal(action, "force-stop")) {
|
---|
519 | acts = "d";
|
---|
520 | kll = 1;
|
---|
521 | break;
|
---|
522 | }
|
---|
523 | default:
|
---|
524 | bb_show_usage();
|
---|
525 | }
|
---|
526 |
|
---|
527 | servicex = service;
|
---|
528 | for (i = 0; i < services; ++i) {
|
---|
529 | if ((**service != '/') && (**service != '.')) {
|
---|
530 | if (chdir(varservice) == -1)
|
---|
531 | goto chdir_failed_0;
|
---|
532 | }
|
---|
533 | if (chdir(*service) == -1) {
|
---|
534 | chdir_failed_0:
|
---|
535 | fail("cannot change to service directory");
|
---|
536 | goto nullify_service_0;
|
---|
537 | }
|
---|
538 | if (act && (act(acts) == -1)) {
|
---|
539 | nullify_service_0:
|
---|
540 | *service = NULL;
|
---|
541 | }
|
---|
542 | if (fchdir(curdir) == -1)
|
---|
543 | fatal_cannot("change to original directory");
|
---|
544 | service++;
|
---|
545 | }
|
---|
546 |
|
---|
547 | if (cbk) while (1) {
|
---|
548 | int diff;
|
---|
549 |
|
---|
550 | diff = tnow - tstart;
|
---|
551 | service = servicex;
|
---|
552 | want_exit = 1;
|
---|
553 | for (i = 0; i < services; ++i, ++service) {
|
---|
554 | if (!*service)
|
---|
555 | continue;
|
---|
556 | if ((**service != '/') && (**service != '.')) {
|
---|
557 | if (chdir(varservice) == -1)
|
---|
558 | goto chdir_failed;
|
---|
559 | }
|
---|
560 | if (chdir(*service) == -1) {
|
---|
561 | chdir_failed:
|
---|
562 | fail("cannot change to service directory");
|
---|
563 | goto nullify_service;
|
---|
564 | }
|
---|
565 | if (cbk(acts) != 0)
|
---|
566 | goto nullify_service;
|
---|
567 | want_exit = 0;
|
---|
568 | if (diff >= waitsec) {
|
---|
569 | printf(kll ? "kill: " : "timeout: ");
|
---|
570 | if (svstatus_get() > 0) {
|
---|
571 | svstatus_print(*service);
|
---|
572 | ++rc;
|
---|
573 | }
|
---|
574 | puts(""); /* will also flush the output */
|
---|
575 | if (kll)
|
---|
576 | control("k");
|
---|
577 | nullify_service:
|
---|
578 | *service = NULL;
|
---|
579 | }
|
---|
580 | if (fchdir(curdir) == -1)
|
---|
581 | fatal_cannot("change to original directory");
|
---|
582 | }
|
---|
583 | if (want_exit) break;
|
---|
584 | usleep(420000);
|
---|
585 | tnow = time(0) + 0x400000000000000aULL;
|
---|
586 | }
|
---|
587 | return rc > 99 ? 99 : rc;
|
---|
588 | }
|
---|