[1765] | 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(".");
|
---|
| 441 | if (curdir == -1)
|
---|
| 442 | fatal_cannot("open current directory");
|
---|
| 443 |
|
---|
| 444 | act = &control;
|
---|
| 445 | acts = "s";
|
---|
| 446 | cbk = ✓
|
---|
| 447 |
|
---|
| 448 | switch (*action) {
|
---|
| 449 | case 'x':
|
---|
| 450 | case 'e':
|
---|
| 451 | acts = "x";
|
---|
| 452 | if (!verbose) cbk = NULL;
|
---|
| 453 | break;
|
---|
| 454 | case 'X':
|
---|
| 455 | case 'E':
|
---|
| 456 | acts = "x";
|
---|
| 457 | kll = 1;
|
---|
| 458 | break;
|
---|
| 459 | case 'D':
|
---|
| 460 | acts = "d";
|
---|
| 461 | kll = 1;
|
---|
| 462 | break;
|
---|
| 463 | case 'T':
|
---|
| 464 | acts = "tc";
|
---|
| 465 | kll = 1;
|
---|
| 466 | break;
|
---|
| 467 | case 'c':
|
---|
| 468 | if (str_equal(action, "check")) {
|
---|
| 469 | act = NULL;
|
---|
| 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 | }
|
---|