lsyncd/lsyncd.c

1020 lines
24 KiB
C
Raw Normal View History

2010-10-19 10:20:27 +00:00
/**
* lsyncd.c Live (Mirror) Syncing Demon
*
* License: GPLv2 (see COPYING) or any later version
*
* Authors: Axel Kittenberger <axkibe@gmail.com>
*
* This is the core. It contains as minimal as possible glues
* to the operating system needed for lsyncd operation. All high-level
* logic is coded (when feasable) into lsyncd.lua
*/
2010-10-14 13:56:23 +00:00
#include "config.h"
2010-10-16 10:26:48 +00:00
#define LUA_USE_APICHECK 1
#ifdef HAVE_SYS_INOTIFY_H
# include <sys/inotify.h>
#else
# include "inotify-nosys.h"
#endif
2010-10-16 18:21:01 +00:00
#include <sys/stat.h>
2010-10-19 10:12:11 +00:00
#include <sys/times.h>
2010-10-18 12:23:46 +00:00
#include <sys/types.h>
#include <sys/wait.h>
2010-10-16 18:21:01 +00:00
#include <dirent.h>
2010-10-16 10:26:48 +00:00
#include <errno.h>
2010-10-16 18:21:01 +00:00
#include <limits.h>
#include <signal.h>
#include <stdbool.h>
#include <stdlib.h>
2010-10-14 13:52:01 +00:00
#include <stdio.h>
2010-10-16 10:26:48 +00:00
#include <string.h>
2010-10-20 15:34:01 +00:00
#include <syslog.h>
#include <time.h>
2010-10-16 10:26:48 +00:00
#include <unistd.h>
2010-10-14 13:52:01 +00:00
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
2010-10-19 10:12:11 +00:00
/**
* Macros to compare times() values
* (borrowed from linux/jiffies.h)
*
* time_after(a,b) returns true if the time a is after time b.
*/
#define time_after(a,b) ((long)(b) - (long)(a) < 0)
#define time_before(a,b) time_after(b,a)
#define time_after_eq(a,b) ((long)(a) - (long)(b) >= 0)
#define time_before_eq(a,b) time_after_eq(b,a)
2010-10-20 15:34:01 +00:00
/**
* Event types core sends to runner.
*/
enum event_type {
2010-10-20 10:25:34 +00:00
NONE = 0,
ATTRIB = 1,
MODIFY = 2,
CREATE = 3,
DELETE = 4,
MOVE = 5,
};
2010-10-18 17:09:59 +00:00
/**
* The Lua part of lsyncd.
*/
2010-10-19 21:56:00 +00:00
#define LSYNCD_DEFAULT_RUNNER_FILE "lsyncd.lua"
2010-10-20 15:34:01 +00:00
static char * lsyncd_runner_file = NULL;
static char * lsyncd_config_file = NULL;
2010-10-18 17:09:59 +00:00
2010-10-16 10:26:48 +00:00
/**
* The inotify file descriptor.
*/
static int inotify_fd;
2010-10-17 15:24:55 +00:00
/**
* TODO allow configure.
*/
2010-10-20 15:34:01 +00:00
static const uint32_t standard_event_mask =
2010-10-17 15:24:55 +00:00
IN_ATTRIB | IN_CLOSE_WRITE | IN_CREATE |
IN_DELETE | IN_DELETE_SELF | IN_MOVED_FROM |
IN_MOVED_TO | IN_DONT_FOLLOW | IN_ONLYDIR;
2010-10-20 15:34:01 +00:00
/**
* If not null lsyncd logs in this file.
*/
static char * logfile = NULL;
2010-10-18 17:09:59 +00:00
/**
2010-10-20 15:34:01 +00:00
* If true lsyncd sends log messages to syslog
2010-10-18 17:09:59 +00:00
*/
2010-10-20 15:34:01 +00:00
bool logsyslog = false;
/**
* lsyncd log level
*/
static enum loglevel {
DEBUG = 1, /* Log debug messages */
VERBOSE = 2, /* Log more */
NORMAL = 3, /* Log short summeries */
ERROR = 4, /* Log severe errors only */
CORE = 0x80 /* Indicates a core message */
} loglevel = NORMAL;
/**
* True when lsyncd daemonized itself.
*/
static bool is_daemon;
2010-10-17 15:24:55 +00:00
2010-10-16 18:21:01 +00:00
/**
* Set to TERM or HUP in signal handler, when lsyncd should end or reset ASAP.
*/
2010-10-20 15:34:01 +00:00
static volatile sig_atomic_t reset = 0;
2010-10-16 10:26:48 +00:00
2010-10-19 10:12:11 +00:00
/**
* The kernels clock ticks per second.
*/
2010-10-20 15:34:01 +00:00
static long clocks_per_sec;
2010-10-19 10:12:11 +00:00
2010-10-20 18:33:17 +00:00
/**
* predeclerations -- see belorw.
*/
static void
logstring0(enum loglevel level,
const char *message);
/* core logs with CORE flag */
#define logstring(loglevel, message) logstring0(loglevel | CORE, message)
static void
printlogf(lua_State *L,
enum loglevel level,
const char *fmt, ...)
__attribute__((format(printf, 3, 4)));
2010-10-17 17:13:53 +00:00
/**
* "secured" calloc.
*/
void *
s_calloc(size_t nmemb, size_t size)
{
2010-10-17 20:26:37 +00:00
void *r = calloc(nmemb, size);
if (r == NULL) {
2010-10-20 18:33:17 +00:00
logstring(ERROR, "Out of memory!");
2010-10-17 20:26:37 +00:00
exit(-1); // ERRNO
}
2010-10-17 17:13:53 +00:00
return r;
}
/**
* "secured" malloc. the deamon shall kill itself
* in case of out of memory.
*/
void *
s_malloc(size_t size)
{
2010-10-17 20:26:37 +00:00
void *r = malloc(size);
if (r == NULL) {
2010-10-20 18:33:17 +00:00
logstring(ERROR, "Out of memory!");
2010-10-17 17:13:53 +00:00
exit(-1); // ERRNO
2010-10-17 20:26:37 +00:00
}
2010-10-17 17:13:53 +00:00
return r;
}
2010-10-14 13:52:01 +00:00
2010-10-19 20:14:55 +00:00
/**
* "secured" realloc.
*/
void *
s_realloc(void *ptr, size_t size)
{
void *r = realloc(ptr, size);
if (r == NULL) {
2010-10-20 18:33:17 +00:00
logstring(ERROR, "Out of memory!");
2010-10-19 20:14:55 +00:00
exit(-1);
}
return r;
}
2010-10-18 17:09:59 +00:00
/**
* "secured" strdup.
*/
char *
s_strdup(const char *src)
{
char *s = strdup(src);
if (s == NULL) {
2010-10-20 18:33:17 +00:00
logstring(ERROR, "Out of memory!");
2010-10-18 17:09:59 +00:00
exit(-1); // ERRNO
}
return s;
}
2010-10-20 18:33:17 +00:00
/**
* Logs a string
*
* @param level the level of the log message
* @param message the log message
*/
static void
logstring0(enum loglevel level,
const char *message)
{
const char *prefix;
/* true if logmessages comes from core */
bool coremsg = (level & CORE) != 0;
/* strip flags from level */
level &= 0x0F;
/* skips filtered messagaes */
if (level < loglevel) {
return;
}
prefix = level == ERROR ?
(coremsg ? "CORE ERROR " : "ERROR ") :
(coremsg ? "core " : "");
/* writes on console */
if (!is_daemon) {
char ct[255];
/* gets current timestamp hour:minute:second */
time_t mtime;
time(&mtime);
strftime(ct, sizeof(ct), "%T", localtime(&mtime));
FILE * flog = level == ERROR ? stderr : stdout;
fprintf(flog, "%s %s%s\n", ct, prefix, message);
}
/* writes on file */
if (logfile) {
FILE * flog = fopen(logfile, "a");
/* gets current timestamp day-time-year */
char * ct;
time_t mtime;
time(&mtime);
ct = ctime(&mtime);
/* cuts trailing linefeed */
ct[strlen(ct) - 1] = 0;
if (flog == NULL) {
fprintf(stderr, "core: cannot open logfile [%s]!\n", logfile);
exit(-1); // ERRNO
}
fprintf(flog, "%s: %s%s", ct, prefix, message);
fclose(flog);
}
/* sends to syslog */
if (logsyslog) {
int sysp;
switch (level) {
case DEBUG :
sysp = LOG_DEBUG;
break;
case VERBOSE :
case NORMAL :
sysp = LOG_NOTICE;
break;
case ERROR :
sysp = LOG_ERR;
break;
default :
/* should never happen */
sysp = 0;
break;
}
syslog(sysp, "%s%s", prefix, message);
}
return;
}
2010-10-18 17:09:59 +00:00
2010-10-18 09:02:51 +00:00
/*****************************************************************************
* Library calls for lsyncd.lua
*
* These are as minimal as possible glues to the operating system needed for
* lsyncd operation.
*
****************************************************************************/
2010-10-17 15:24:55 +00:00
2010-10-16 10:26:48 +00:00
/**
2010-10-17 15:24:55 +00:00
* Adds an inotify watch
*
2010-10-18 09:02:51 +00:00
* @param dir (Lua stack) path to directory
* @return (Lua stack) numeric watch descriptor
2010-10-16 10:26:48 +00:00
*/
2010-10-17 15:24:55 +00:00
static int
2010-10-18 09:02:51 +00:00
l_add_watch(lua_State *L)
2010-10-16 18:21:01 +00:00
{
2010-10-17 15:24:55 +00:00
const char *path = luaL_checkstring(L, 1);
lua_Integer wd = inotify_add_watch(inotify_fd, path, standard_event_mask);
lua_pushinteger(L, wd);
return 1;
2010-10-16 10:26:48 +00:00
}
2010-10-20 15:34:01 +00:00
/**
2010-10-20 18:33:17 +00:00
* Logs a message.
2010-10-20 15:34:01 +00:00
*
* @param loglevel (Lua stack) loglevel of massage
* @param string (Lua stack) the string to log
*/
static int
l_log(lua_State *L)
{
/* log message */
const char * message;
/* log level */
int level = luaL_checkinteger(L, 1);
2010-10-20 18:33:17 +00:00
/* skips filtered messages early */
if ((level & 0x0F) < loglevel) {
2010-10-20 15:34:01 +00:00
return 0;
}
message = luaL_checkstring(L, 2);
2010-10-20 18:33:17 +00:00
logstring0(level, message);
2010-10-20 15:34:01 +00:00
return 0;
}
2010-10-19 10:12:11 +00:00
/**
* Returns (on Lua stack) the current kernels clock state (jiffies, times() call)
*/
static int
l_now(lua_State *L)
{
clock_t c = times(NULL);
lua_pushinteger(L, c);
return 1;
}
2010-10-17 17:13:53 +00:00
/**
2010-10-18 09:02:51 +00:00
* Executes a subprocess. Does not wait for it to return.
*
* @param (Lua stack) Path to binary to call
* @params (Lua stack) list of string as arguments
* @return (Lua stack) the pid on success, 0 on failure.
2010-10-17 17:13:53 +00:00
*/
static int
2010-10-18 09:02:51 +00:00
l_exec(lua_State *L)
2010-10-17 17:13:53 +00:00
{
2010-10-17 20:26:37 +00:00
const char *binary = luaL_checkstring(L, 1);
2010-10-17 17:13:53 +00:00
int argc = lua_gettop(L) - 1;
2010-10-17 20:26:37 +00:00
pid_t pid;
2010-10-17 17:13:53 +00:00
int i;
2010-10-17 20:26:37 +00:00
char const **argv = s_calloc(argc + 2, sizeof(char *));
argv[0] = binary;
2010-10-18 09:02:51 +00:00
for(i = 1; i <= argc; i++) {
2010-10-17 20:26:37 +00:00
argv[i] = luaL_checkstring(L, i + 1);
}
argv[i] = NULL;
pid = fork();
if (pid == 0) {
//if (!log->flag_nodaemon && log->logfile) {
// if (!freopen(log->logfile, "a", stdout)) {
// printlogf(log, ERROR, "cannot redirect stdout to [%s].", log->logfile);
// }
// if (!freopen(log->logfile, "a", stderr)) {
// printlogf(log, ERROR, "cannot redirect stderr to [%s].", log->logfile);
// }
//}
execv(binary, (char **)argv);
// in a sane world execv does not return!
2010-10-20 18:33:17 +00:00
printlogf(L, ERROR, "Failed executing [%s]!", binary);
2010-10-17 20:26:37 +00:00
exit(-1); // ERRNO
2010-10-17 17:13:53 +00:00
}
2010-10-17 20:26:37 +00:00
free(argv);
2010-10-18 09:02:51 +00:00
lua_pushnumber(L, pid);
return 1;
2010-10-17 17:13:53 +00:00
}
2010-10-16 18:21:01 +00:00
2010-10-16 10:26:48 +00:00
/**
2010-10-16 18:21:01 +00:00
* Converts a relative directory path to an absolute.
*
* @param dir a relative path to directory
* @return absolute path of directory
2010-10-16 10:26:48 +00:00
*/
2010-10-17 15:24:55 +00:00
static int
2010-10-18 09:02:51 +00:00
l_real_dir(lua_State *L)
2010-10-17 15:24:55 +00:00
{
2010-10-16 18:21:01 +00:00
luaL_Buffer b;
char *cbuf;
const char *rdir = luaL_checkstring(L, 1);
/* use c-library to get absolute path */
cbuf = realpath(rdir, NULL);
if (cbuf == NULL) {
2010-10-20 18:33:17 +00:00
printlogf(L, ERROR, "failure getting absolute path of [%s]", rdir);
2010-10-16 18:21:01 +00:00
return 0;
}
{
/* makes sure its a directory */
struct stat st;
stat(cbuf, &st);
if (!S_ISDIR(st.st_mode)) {
2010-10-20 18:33:17 +00:00
printlogf(L, ERROR, "failure in real_dir [%s] is not a directory", rdir);
2010-10-16 18:21:01 +00:00
free(cbuf);
return 0;
}
}
/* returns absolute path with a concated '/' */
luaL_buffinit(L, &b);
luaL_addstring(&b, cbuf);
luaL_addchar(&b, '/');
luaL_pushresult(&b);
free(cbuf);
return 1;
}
2010-10-17 15:24:55 +00:00
/**
* Dumps the LUA stack. For debugging purposes.
*/
static int
2010-10-18 10:26:15 +00:00
l_stackdump(lua_State* L)
2010-10-17 15:24:55 +00:00
{
int i;
2010-10-18 10:26:15 +00:00
int top = lua_gettop(L);
2010-10-20 18:33:17 +00:00
printlogf(L, DEBUG, "total in stack %d\n",top);
2010-10-17 15:24:55 +00:00
for (i = 1; i <= top; i++) {
2010-10-18 10:26:15 +00:00
int t = lua_type(L, i);
2010-10-17 15:24:55 +00:00
switch (t) {
2010-10-20 15:34:01 +00:00
case LUA_TSTRING:
2010-10-20 18:33:17 +00:00
printlogf(L, DEBUG, "%d string: '%s'\n", i, lua_tostring(L, i));
2010-10-20 15:34:01 +00:00
break;
case LUA_TBOOLEAN:
2010-10-20 18:33:17 +00:00
printlogf(L, DEBUG, "%d boolean %s\n", i, lua_toboolean(L, i) ? "true" : "false");
2010-10-20 15:34:01 +00:00
break;
case LUA_TNUMBER:
2010-10-20 18:33:17 +00:00
printlogf(L, DEBUG, "%d number: %g\n", i, lua_tonumber(L, i));
2010-10-20 15:34:01 +00:00
break;
default:
2010-10-20 18:33:17 +00:00
printlogf(L, DEBUG, "%d %s\n", i, lua_typename(L, t));
2010-10-20 15:34:01 +00:00
break;
2010-10-17 15:24:55 +00:00
}
2010-10-17 20:26:37 +00:00
}
2010-10-17 15:24:55 +00:00
return 0;
}
2010-10-16 18:21:01 +00:00
/**
* Reads the directories sub directories.
*
2010-10-18 09:02:51 +00:00
* @param (Lua stack) absolute path to directory.
* @return (Lua stack) a table of directory names.
2010-10-16 18:21:01 +00:00
*/
2010-10-17 15:24:55 +00:00
static int
2010-10-18 09:02:51 +00:00
l_sub_dirs (lua_State *L)
2010-10-17 15:24:55 +00:00
{
2010-10-16 18:21:01 +00:00
const char * dirname = luaL_checkstring(L, 1);
DIR *d;
int idx = 1;
d = opendir(dirname);
2010-10-17 20:26:37 +00:00
if (d == NULL) {
2010-10-20 18:33:17 +00:00
printlogf(L, ERROR, "cannot open dir [%s].", dirname);
2010-10-17 20:26:37 +00:00
return 0;
2010-10-16 18:21:01 +00:00
}
lua_newtable(L);
while (!reset) {
struct dirent *de = readdir(d);
bool isdir;
if (de == NULL) {
/* finished */
break;
}
if (de->d_type == DT_UNKNOWN) {
/* must call stat on some systems :-/ */
2010-10-17 17:13:53 +00:00
char *subdir = s_malloc(strlen(dirname) + strlen(de->d_name) + 2);
2010-10-16 18:21:01 +00:00
struct stat st;
strcpy(subdir, dirname);
strcat(subdir, "/");
strcat(subdir, de->d_name);
stat(subdir, &st);
isdir = S_ISDIR(st.st_mode);
free(subdir);
} else {
2010-10-18 17:09:59 +00:00
/* readdir can trusted */
2010-10-16 18:21:01 +00:00
isdir = de->d_type == DT_DIR;
}
if (!isdir || !strcmp(de->d_name, ".") || !strcmp(de->d_name, "..")) {
/* ignore non directories and . and .. */
continue;
}
2010-10-18 09:02:51 +00:00
/* add this to the Lua table */
2010-10-16 18:21:01 +00:00
lua_pushnumber(L, idx++);
lua_pushstring(L, de->d_name);
lua_settable(L, -3);
}
return 1;
}
2010-10-16 10:26:48 +00:00
2010-10-18 12:23:46 +00:00
/**
* Terminates lsyncd daemon.
*
* @param (Lua stack) exitcode for lsyncd.
*
* Does not return.
*/
int
l_terminate(lua_State *L)
{
int exitcode = luaL_checkinteger(L, 1);
exit(exitcode);
return 0;
}
2010-10-18 10:26:15 +00:00
/**
2010-10-19 20:14:55 +00:00
* Waits after startup for a table of child processes.
2010-10-18 10:26:15 +00:00
*
* @param (Lua stack) a table of the children pids.
2010-10-19 20:14:55 +00:00
* @param (Lua stack) a function of a collector to be called
* when a child finishes.
2010-10-18 10:26:15 +00:00
*/
2010-10-19 21:56:00 +00:00
int
2010-10-19 20:14:55 +00:00
l_wait_pids(lua_State *L)
2010-10-18 10:26:15 +00:00
{
2010-10-18 12:23:46 +00:00
/* the number of pids in table */
int pidn;
/* the pid table */
int *pids;
/* the number of children to be waited for */
int remaining = 0;
int i;
2010-10-19 20:14:55 +00:00
/* global function to call on finished processes */
const char * collector;
2010-10-18 12:23:46 +00:00
/* checks if Lua script returned a table */
2010-10-19 20:14:55 +00:00
luaL_checktype(L, 1, LUA_TTABLE);
if (lua_type(L, 2) == LUA_TNIL) {
collector = NULL;
} else {
collector = luaL_checkstring(L, 2);
2010-10-18 10:26:15 +00:00
}
2010-10-19 20:14:55 +00:00
2010-10-18 12:23:46 +00:00
/* determines size of the pid-table */
2010-10-19 20:14:55 +00:00
pidn = lua_objlen (L, 1);
2010-10-18 10:26:15 +00:00
if (pidn == 0) {
/* nothing to do on zero pids */
2010-10-19 21:56:00 +00:00
return 0;
2010-10-18 10:26:15 +00:00
}
2010-10-18 12:23:46 +00:00
/* reads the pid table from Lua stack */
2010-10-18 10:26:15 +00:00
pids = s_calloc(pidn, sizeof(int));
for(i = 0; i < pidn; i++) {
2010-10-19 20:14:55 +00:00
lua_rawgeti(L, 1, i + 1);
2010-10-18 12:23:46 +00:00
pids[i] = luaL_checkinteger(L, -1);
lua_pop(L, 1);
/* ignores zero pids */
if (pids[i]) {
remaining++;
}
2010-10-18 10:26:15 +00:00
}
2010-10-19 10:12:11 +00:00
/* starts waiting for the children */
2010-10-18 12:23:46 +00:00
while(remaining) {
/* argument for waitpid, and exitcode of child */
int status, exitcode;
/* new process id in case of retry */
int newp;
/* process id of terminated child process */
int wp = waitpid(0, &status, 0);
/* if nothing really finished ignore */
if (wp == 0 || !WIFEXITED(status)) {
continue;
}
exitcode = WEXITSTATUS(status);
/* checks if the pid is one waited for */
for(i = 0; i < pidn; i++) {
if (pids[i] == wp) {
break;
}
}
if (i >= pidn) {
/* not a pid waited for */
continue;
}
2010-10-19 20:14:55 +00:00
/* calls the lua collector to determine further actions */
if (collector) {
lua_getglobal(L, collector);
lua_pushinteger(L, wp);
lua_pushinteger(L, exitcode);
lua_call(L, 2, 1);
newp = luaL_checkinteger(L, -1);
lua_pop(L, 1);
} else {
newp = 0;
}
2010-10-18 12:23:46 +00:00
/* replace the new pid in the pidtable,
or zero it on no new pid */
for(i = 0; i < pidn; i++) {
if (pids[i] == wp) {
pids[i] = newp;
if (newp == 0) {
remaining--;
}
2010-10-19 10:12:11 +00:00
/* does not break, in case there are duplicate pids (whyever) */
2010-10-18 12:23:46 +00:00
}
}
}
2010-10-18 10:26:15 +00:00
free(pids);
2010-10-19 21:56:00 +00:00
return 0;
2010-10-18 10:26:15 +00:00
}
2010-10-19 16:40:49 +00:00
2010-10-19 20:14:55 +00:00
static const luaL_reg lsyncdlib[] = {
{"add_watch", l_add_watch },
2010-10-20 15:34:01 +00:00
{"log", l_log },
2010-10-19 20:14:55 +00:00
{"now", l_now },
{"exec", l_exec },
{"real_dir", l_real_dir },
{"stackdump", l_stackdump },
{"sub_dirs", l_sub_dirs },
{"terminate", l_terminate },
{"wait_pids", l_wait_pids },
{NULL, NULL}
};
/*****************************************************************************
* Lsyncd Core
****************************************************************************/
2010-10-20 15:34:01 +00:00
/**
2010-10-20 18:33:17 +00:00
* Let the core print logmessage comfortably.
2010-10-20 15:34:01 +00:00
*/
static void
printlogf(lua_State *L,
enum loglevel level,
2010-10-20 18:33:17 +00:00
const char *fmt, ...)
2010-10-20 15:34:01 +00:00
{
va_list ap;
2010-10-20 18:33:17 +00:00
/* skips filtered messages early */
if (level < loglevel) {
return;
}
2010-10-20 15:34:01 +00:00
lua_pushcfunction(L, l_log);
2010-10-20 18:33:17 +00:00
lua_pushinteger(L, level | CORE);
2010-10-20 15:34:01 +00:00
va_start(ap, fmt);
lua_pushvfstring(L, fmt, ap);
va_end(ap);
lua_call(L, 2, 0);
return;
}
2010-10-19 20:14:55 +00:00
/**
* Transfers the core relevant settings from lua's global "settings" into core.
* This saves time in normal operation instead of bothering lua all the time.
*/
2010-10-20 15:34:01 +00:00
/*
2010-10-19 20:14:55 +00:00
void
get_settings(lua_State *L)
{
if (settings.logfile) {
free(settings.logfile);
settings.logfile = NULL;
}
lua_getglobal(L, "settings");
if (!lua_istable(L, -1)) {
return;
}
lua_pushstring(L, "logfile");
lua_gettable(L, -2);
if (settings.logfile) {
free(settings.logfile);
settings.logfile = NULL;
}
if (lua_isstring(L, -1)) {
settings.logfile = s_strdup(luaL_checkstring(L, -1));
}
lua_pop(L, 1);
lua_pop(L, 1);
2010-10-20 15:34:01 +00:00
}*/
2010-10-19 20:14:55 +00:00
/**
* Buffer for MOVE_FROM events.
* Lsyncd buffers MOVE_FROM events to check if
*/
struct inotify_event * move_event_buf = NULL;
size_t move_event_buf_size = 0;
2010-10-20 10:25:34 +00:00
/* true if the buffer is used.*/
bool move_event = false;
2010-10-19 20:14:55 +00:00
2010-10-19 16:40:49 +00:00
/**
* Handles an inotify event.
*/
void handle_event(lua_State *L, struct inotify_event *event) {
2010-10-20 10:25:34 +00:00
/* TODO */
int event_type = NONE;
/* used to execute two events in case of unmatched MOVE_FROM buffer */
struct inotify_event *after_buf = NULL;
2010-10-20 18:33:17 +00:00
if (reset) {
return;
}
if (event && (IN_Q_OVERFLOW & event->mask)) {
/* and overflow happened, lets runner/user decide what to do. */
lua_getglobal(L, "overflow");
lua_call(L, 0, 0);
return;
}
/* cancel on ignored or resetting */
if (event && (IN_IGNORED & event->mask)) {
return;
2010-10-20 13:01:26 +00:00
}
2010-10-20 10:25:34 +00:00
if (event == NULL) {
2010-10-20 13:01:26 +00:00
/* a buffered MOVE_FROM is not followed by anything, thus it is unary */
2010-10-20 10:25:34 +00:00
event = move_event_buf;
2010-10-20 13:01:26 +00:00
event_type = DELETE;
2010-10-20 10:25:34 +00:00
move_event = false;
2010-10-20 13:01:26 +00:00
} else if (move_event && (!(IN_MOVED_TO & event->mask)|| event->cookie != move_event_buf->cookie)) {
2010-10-20 10:25:34 +00:00
/* there is a MOVE_FROM event in the buffer and this is not the match */
/* continue in this function iteration to handler the buffer instead */
after_buf = event;
2010-10-20 13:01:26 +00:00
event = move_event_buf;
2010-10-20 10:25:34 +00:00
event_type = DELETE;
move_event = false;
} else if (move_event && (IN_MOVED_TO & event->mask) && event->cookie == move_event_buf->cookie) {
/* this is indeed a matched move */
event_type = MOVE;
move_event = false;
} else if (IN_MOVED_FROM & event->mask) {
/* just the MOVE_FROM, buffers this event, and wait if next event is a matching
* MOVED_TO of this was an unary move out of the watched tree. */
if (move_event_buf_size < sizeof(struct inotify_event) + event->len) {
move_event_buf_size = sizeof(struct inotify_event) + event->len;
move_event_buf = s_realloc(move_event_buf, move_event_buf_size);
2010-10-19 16:40:49 +00:00
}
2010-10-20 10:25:34 +00:00
memcpy(move_event_buf, event, sizeof(struct inotify_event) + event->len);
2010-10-20 13:01:26 +00:00
move_event = true;
2010-10-20 10:25:34 +00:00
return;
2010-10-20 13:01:26 +00:00
} else if (IN_MOVED_TO & event->mask) {
/* must be an unary moveto */
event_type = CREATE;
} else if (IN_MOVED_FROM & event->mask) {
2010-10-20 10:25:34 +00:00
/* must be an unary movefrom */
event_type = DELETE;
} else if (IN_ATTRIB & event->mask) {
2010-10-20 13:01:26 +00:00
/* just attrib change */
2010-10-20 10:25:34 +00:00
event_type = ATTRIB;
} else if (IN_CLOSE_WRITE & event->mask) {
2010-10-20 13:01:26 +00:00
/* closed after written something */
2010-10-20 10:25:34 +00:00
event_type = MODIFY;
} else if (IN_CREATE & event->mask) {
2010-10-20 13:01:26 +00:00
/* a new file */
2010-10-20 10:25:34 +00:00
event_type = CREATE;
} else if (IN_DELETE & event->mask) {
2010-10-20 13:01:26 +00:00
/* rm'ed */
2010-10-20 10:25:34 +00:00
event_type = DELETE;
2010-10-20 13:01:26 +00:00
} else {
2010-10-20 18:33:17 +00:00
logstring(DEBUG, "skipped some inotify event.");
2010-10-20 13:01:26 +00:00
return;
2010-10-19 16:40:49 +00:00
}
2010-10-20 13:01:26 +00:00
2010-10-20 10:25:34 +00:00
lua_getglobal(L, "lsyncd_event");
lua_pushnumber(L, event_type);
2010-10-20 13:01:26 +00:00
lua_pushnumber(L, event->wd);
if (event_type == MOVE) {
lua_pushstring(L, move_event_buf->name);
lua_pushstring(L, event->name);
} else {
lua_pushstring(L, event->name);
lua_pushnil(L);
}
lua_call(L, 4, 0);
2010-10-19 16:40:49 +00:00
2010-10-20 10:25:34 +00:00
if (after_buf) {
handle_event(L, after_buf);
}
2010-10-19 16:40:49 +00:00
}
2010-10-19 10:12:11 +00:00
/**
* Normal operation happens in here.
*/
void
masterloop(lua_State *L)
{
2010-10-19 20:14:55 +00:00
size_t readbuf_size = 2048;
char *readbuf = s_malloc(readbuf_size);
2010-10-19 10:12:11 +00:00
while(!reset) {
int alarm_state;
clock_t now = times(NULL);
clock_t alarm_time;
bool do_read = false;
ssize_t len;
/* query runner about soonest alarm */
lua_getglobal(L, "lsyncd_get_alarm");
lua_pushnumber(L, now);
lua_call(L, 1, 2);
alarm_state = luaL_checkinteger(L, -2);
alarm_time = (clock_t) luaL_checknumber(L, -1);
lua_pop(L, 2);
if (alarm_state < 0) {
2010-10-19 20:14:55 +00:00
/* there is a delay that wants to be handled already
* thus do not read from inotify_fd and jump directly to its handling */
2010-10-20 18:33:17 +00:00
logstring(DEBUG, "immediately handling delayed entries.");
2010-10-19 10:12:11 +00:00
do_read = 0;
} else if (alarm_state > 0) {
2010-10-19 20:14:55 +00:00
/* use select() to determine what happens next
* + a new event on inotify
* + an alarm on timeout
* + the return of a child process */
2010-10-19 10:12:11 +00:00
fd_set readfds;
struct timeval tv;
if (time_after(now, alarm_time)) {
/* should never happen */
2010-10-20 18:33:17 +00:00
logstring(ERROR, "critical failure, alarm_time is in past!\n");
2010-10-19 10:12:11 +00:00
exit(-1); //ERRNO
}
tv.tv_sec = (alarm_time - now) / clocks_per_sec;
tv.tv_usec = (alarm_time - now) * 1000000 / clocks_per_sec % 1000000;
2010-10-19 20:14:55 +00:00
/* if select returns a positive number there is data on inotify *
* on zero the timemout occured. */
2010-10-19 10:12:11 +00:00
FD_ZERO(&readfds);
FD_SET(inotify_fd, &readfds);
do_read = select(inotify_fd + 1, &readfds, NULL, NULL, &tv);
if (do_read) {
2010-10-20 18:33:17 +00:00
logstring(DEBUG, "theres data on inotify.");
2010-10-19 10:12:11 +00:00
} else {
2010-10-20 18:33:17 +00:00
logstring(DEBUG, "core: select() timeout or signal.");
2010-10-19 10:12:11 +00:00
}
} else {
// if nothing to wait for, enter a blocking read
2010-10-20 18:33:17 +00:00
logstring(DEBUG, "gone blocking.");
2010-10-19 10:12:11 +00:00
do_read = 1;
}
2010-10-19 16:40:49 +00:00
/* reads possible events from inotify stream */
do {
int i = 0;
if (do_read) {
2010-10-19 20:14:55 +00:00
do {
len = read (inotify_fd, readbuf, readbuf_size);
if (len < 0 && errno == EINVAL) {
/* kernel > 2.6.21 indicates that way that way that
* the buffer was too small to fit a filename.
* double its size and try again. When using a lower
* kernel and a filename > 2KB appears lsyncd
* will fail. (but does a 2KB filename really happen?)*/
readbuf_size *= 2;
readbuf = s_realloc(readbuf, readbuf_size);
continue;
}
} while(0);
2010-10-19 16:40:49 +00:00
} else {
len = 0;
}
while (i < len && !reset) {
struct inotify_event *event = (struct inotify_event *) &readbuf[i];
handle_event(L, event);
i += sizeof(struct inotify_event) + event->len;
}
/* check if there is more data */
if (do_read) {
struct timeval tv = {.tv_sec = 0, .tv_usec = 0};
fd_set readfds;
FD_ZERO(&readfds);
FD_SET(inotify_fd, &readfds);
do_read = select(inotify_fd + 1, &readfds, NULL, NULL, &tv);
if (do_read) {
2010-10-20 18:33:17 +00:00
logstring(DEBUG, "there is more data on inotify.");
2010-10-19 16:40:49 +00:00
}
}
} while (do_read);
2010-10-20 13:01:26 +00:00
/* checks if there is an unary MOVE_FROM in the buffer */
if (move_event) {
handle_event(L, NULL);
}
2010-10-19 10:12:11 +00:00
}
}
2010-10-19 16:40:49 +00:00
2010-10-18 10:26:15 +00:00
/**
* Main
*/
2010-10-17 15:24:55 +00:00
int
main(int argc, char *argv[])
2010-10-14 13:52:01 +00:00
{
2010-10-19 21:56:00 +00:00
/* position at cores (minimal) argument parsing *
* most arguments are parsed in the lua runner */
int argp = 1;
if (argc < 2) {
2010-10-20 18:33:17 +00:00
fprintf(stderr, "Missing config file\n");
fprintf(stderr, "Minimal Usage: %s CONFIG_FILE\n", argv[0]);
fprintf(stderr, " Specify --help for more help.\n");
2010-10-19 21:56:00 +00:00
return -1; // ERRNO
}
2010-10-19 10:12:11 +00:00
/* kernel parameters */
clocks_per_sec = sysconf(_SC_CLK_TCK);
2010-10-17 17:13:53 +00:00
/* the Lua interpreter */
lua_State* L;
2010-10-19 10:20:27 +00:00
/* TODO check lua version */
2010-10-16 10:26:48 +00:00
/* load Lua */
2010-10-14 13:52:01 +00:00
L = lua_open();
luaL_openlibs(L);
2010-10-17 15:24:55 +00:00
luaL_register(L, "lsyncd", lsyncdlib);
2010-10-18 10:26:15 +00:00
lua_setglobal(L, "lysncd");
2010-10-16 10:26:48 +00:00
2010-10-20 15:34:01 +00:00
/* register event types */
2010-10-20 10:25:34 +00:00
lua_pushinteger(L, ATTRIB); lua_setglobal(L, "ATTRIB");
lua_pushinteger(L, MODIFY); lua_setglobal(L, "MODIFY");
lua_pushinteger(L, CREATE); lua_setglobal(L, "CREATE");
lua_pushinteger(L, DELETE); lua_setglobal(L, "DELETE");
lua_pushinteger(L, MOVE); lua_setglobal(L, "MOVE");
2010-10-20 15:34:01 +00:00
/* register log levels */
lua_pushinteger(L, DEBUG); lua_setglobal(L, "DEBUG");
lua_pushinteger(L, VERBOSE); lua_setglobal(L, "VERBOSE");
lua_pushinteger(L, NORMAL); lua_setglobal(L, "NORMAL");
lua_pushinteger(L, ERROR); lua_setglobal(L, "ERROR");
2010-10-19 16:40:49 +00:00
2010-10-19 21:56:00 +00:00
/* TODO parse runner */
if (!strcmp(argv[argp], "--runner")) {
if (argc < 3) {
2010-10-20 18:33:17 +00:00
fprintf(stderr, "Lsyncd Lua-runner file missing after --runner.\n");
2010-10-19 21:56:00 +00:00
return -1; //ERRNO
}
if (argc < 4) {
2010-10-20 18:33:17 +00:00
fprintf(stderr, "Missing config file\n");
fprintf(stderr, " Usage: %s --runner %s CONFIG_FILE\n", argv[0], argv[2]);
fprintf(stderr, " Specify --help for more help.\n");
2010-10-19 21:56:00 +00:00
return -1; // ERRNO
}
lsyncd_runner_file = argv[argp + 1];
argp += 2;
} else {
lsyncd_runner_file = LSYNCD_DEFAULT_RUNNER_FILE;
}
lsyncd_config_file = argv[argp];
{
struct stat st;
if (stat(lsyncd_runner_file, &st)) {
2010-10-20 18:33:17 +00:00
fprintf(stderr, "Cannot find Lsyncd Lua-runner at %s.\n", lsyncd_runner_file);
fprintf(stderr, "Maybe specify another place? %s --runner RUNNER_FILE CONFIG_FILE\n", argv[0]);
2010-10-19 21:56:00 +00:00
return -1; // ERRNO
}
if (stat(lsyncd_config_file, &st)) {
2010-10-20 18:33:17 +00:00
fprintf(stderr, "Cannot find config file at %s.\n", lsyncd_config_file);
2010-10-19 21:56:00 +00:00
return -1; // ERRNO
}
}
if (luaL_loadfile(L, lsyncd_runner_file)) {
2010-10-20 18:33:17 +00:00
fprintf(stderr, "error loading '%s': %s\n",
2010-10-19 21:56:00 +00:00
lsyncd_runner_file, lua_tostring(L, -1));
2010-10-16 10:26:48 +00:00
return -1; // ERRNO
}
2010-10-16 18:21:01 +00:00
if (lua_pcall(L, 0, LUA_MULTRET, 0)) {
2010-10-20 18:33:17 +00:00
fprintf(stderr, "error preparing '%s': %s\n",
2010-10-19 21:56:00 +00:00
lsyncd_runner_file, lua_tostring(L, -1));
2010-10-17 17:13:53 +00:00
return -1; // ERRNO
}
2010-10-18 17:09:59 +00:00
{
/* checks version match between runner/core */
const char *lversion;
lua_getglobal(L, "lsyncd_version");
lversion = luaL_checkstring(L, -1);
lua_pop(L, 1);
if (strcmp(lversion, PACKAGE_VERSION)) {
2010-10-20 18:33:17 +00:00
fprintf(stderr, "Version mismatch '%s' is '%s', but core is '%s'\n",
lsyncd_runner_file, lversion, PACKAGE_VERSION);
2010-10-18 17:09:59 +00:00
return -1; // ERRNO
}
}
2010-10-19 21:56:00 +00:00
if (luaL_loadfile(L, lsyncd_config_file)) {
2010-10-20 18:33:17 +00:00
fprintf(stderr, "error loading %s: %s\n", lsyncd_config_file, lua_tostring(L, -1));
2010-10-16 18:21:01 +00:00
return -1; // ERRNO
}
2010-10-17 17:13:53 +00:00
if (lua_pcall(L, 0, LUA_MULTRET, 0)) {
2010-10-20 18:33:17 +00:00
fprintf(stderr, "error preparing %s: %s\n", lsyncd_config_file, lua_tostring(L, -1));
2010-10-17 17:13:53 +00:00
return -1; // ERRNO
}
2010-10-16 10:26:48 +00:00
/* open inotify */
2010-10-17 20:26:37 +00:00
inotify_fd = inotify_init();
if (inotify_fd == -1) {
2010-10-20 18:33:17 +00:00
fprintf(stderr, "Cannot create inotify instance! (%d:%s)\n", errno, strerror(errno));
2010-10-17 20:26:37 +00:00
return -1; // ERRNO
}
2010-10-16 10:26:48 +00:00
2010-10-17 15:24:55 +00:00
/* initialize */
2010-10-18 09:02:51 +00:00
/* lua code will set configuration and add watches */
2010-10-17 15:24:55 +00:00
lua_getglobal(L, "lsyncd_initialize");
lua_call(L, 0, 0);
2010-10-18 17:09:59 +00:00
2010-10-19 20:14:55 +00:00
/* let lua code will perform startup calls like recursive rsync */
2010-10-17 17:13:53 +00:00
lua_getglobal(L, "startup");
2010-10-19 10:12:11 +00:00
lua_call(L, 0, 0);
masterloop(L);
2010-10-18 17:09:59 +00:00
2010-10-17 15:24:55 +00:00
/* cleanup */
2010-10-16 10:26:48 +00:00
close(inotify_fd);
2010-10-14 13:52:01 +00:00
lua_close(L);
return 0;
}