mirror of
https://github.com/troglobit/finit.git
synced 2026-10-02 22:13:01 +07:00
Joachim Nilsson
54cfa74042
Services, like dbus and teamd for instance, may create their PID files in a subdirectory of /var/run (today often /run). E.g., - /var/run/teamd/a1.pid -- For aggregate A1 - /var/run/dbus/pid - /var/run/lxc/foo.pid -- For container foo This patch adds support for dynamically adding inotify watchers to any new subdirectory created in /var/run (discarding too deep directories). To match services in this directory the run/task/service/sysv stanza must contain the pid:!/path/to/pidfile.pid syntax. This pid file name is also used to create the condition this service asserts using the following formula: svc/ + <dirname of service> + <subdir and file without .pid> E.g., the case of teamd (above) gives condition 'svc/usr/bin/teamd/a1' The special case of dbus is interesting, since it may not be a special case, but rather the norm for services using a subdirectory. It is handled as follows; when a new subdirectory is detected, the directory is scanned for files matching *.pid. Matching files follow the teamd case. The directory is also scanned for 'pid', which then gives us the condition 'svc/usr/bin/dbus' One last example, illustrated by lxc-start, where we want to track the condition for the LXC container foo. The service stanza: service pid:!/run/lxc/foo.pid lxc-start -n foo -F -p /run/lxc/foo.pid -- Container foo This command has no leading path so the condition is composed entirely from the PID file location: svc/ + '' + lxc/foo => svc/lxc/foo Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
132 lines
3.0 KiB
C
132 lines
3.0 KiB
C
/* Condition engine (read)
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*
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* Copyright (c) 2015-2017 Tobias Waldekranz <tobias@waldekranz.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <lite/lite.h>
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#include <stdio.h>
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#include "finit.h"
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#include "cond.h"
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#include "pid.h"
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#include "service.h"
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const char *condstr(enum cond_state s)
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{
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static const char *strs[] = {
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[COND_OFF] = "off",
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[COND_FLUX] = "flux",
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[COND_ON] = "on",
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};
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return strs[s];
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}
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const char *cond_path(const char *name)
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{
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static char path[256];
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char tmp[MAX_ARG_LEN];
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snprintf(tmp, sizeof(tmp), COND_PATH "/%s", name);
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return pid_runpath(tmp, path, sizeof(path));
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}
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unsigned int cond_get_gen(const char *file)
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{
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unsigned int gen;
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char *ptr, path[256];
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FILE *fp;
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int ret;
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/* /var/run --> /run symlink may not exist (yet) */
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ptr = pid_runpath(file, path, sizeof(path));
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fp = fopen(ptr, "r");
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if (!fp)
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return 0;
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ret = fscanf(fp, "%u", &gen);
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fclose(fp);
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return (ret == 1) ? gen : 0;
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}
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enum cond_state cond_get_path(const char *path)
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{
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int cgen, rgen;
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rgen = cond_get_gen(COND_RECONF);
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if (!rgen)
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return COND_OFF;
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cgen = cond_get_gen(path);
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if (!cgen)
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return COND_OFF;
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return (cgen == rgen) ? COND_ON : COND_FLUX;
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}
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enum cond_state cond_get(const char *name)
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{
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return cond_get_path(cond_path(name));
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}
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enum cond_state cond_get_agg(const char *names)
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{
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static char conds[MAX_COND_LEN];
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enum cond_state s = COND_ON;
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char *cond;
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if (!names)
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return COND_ON;
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strlcpy(conds, names, sizeof(conds));
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for (cond = strtok(conds, ","); s && cond; cond = strtok(NULL, ","))
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s = min(s, cond_get(cond));
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return s;
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}
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int cond_affects(const char *name, const char *names)
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{
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static char conds[MAX_COND_LEN];
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char *cond;
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if (!name || !names)
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return 0;
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strlcpy(conds, names, sizeof(conds));
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for (cond = strtok(conds, ","); cond; cond = strtok(NULL, ",")) {
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if (!strcmp(cond, name))
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return 1;
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}
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return 0;
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}
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/**
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* Local Variables:
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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