-//
// This is a supervisor program that handles start/stop/restart of
// the various Citadel System components, when we are running on
// an AppImage instance.
// This program is open source software. It runs great on the
// Linux operating system (and probably elsewhere). You can use,
// copy, and run it under the terms of the GNU General Public
-// License version 3. Richard Stallman is an asshole communist.
+// License version 3.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
#include <stdio.h>
#include <sys/wait.h>
#include <errno.h>
+#include <signal.h>
+#include <string.h>
+#include <limits.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+pid_t citserver_pid;
+pid_t webcit_pid;
+pid_t webcits_pid;
+int shutting_down = 0;
+
+// Call this instead of exit() just for common diagnostics etc.
+void ctdlvisor_exit(int code) {
+ printf("ctdlvisor: exit code %d\n", code);
+ exit(code);
+}
+
+
+// Interrupting this program with a signal will begin an orderly shutdown.
+void signal_handler(int signal) {
+ fprintf(stderr, "ctdlvisor: caught signal %d\n", signal);
+
+ while(shutting_down) {
+ fprintf(stderr, "ctdlvisor: already shutting down\n");
+ sleep(1);
+ }
+
+ int status;
+ pid_t who_exited;
+ char *what_exited = NULL;
+
+ shutting_down = 1;
+ kill(citserver_pid, SIGTERM);
+ kill(webcit_pid, SIGTERM);
+ kill(webcits_pid, SIGTERM);
+ do {
+ fprintf(stderr, "ctdlvisor: waiting for all child process to exit...\n");
+ who_exited = waitpid(-1, &status, 0);
+ if (who_exited == citserver_pid) {
+ what_exited = "Citadel Server";
+ }
+ else if (who_exited == webcit_pid) {
+ what_exited = "WebCit HTTP";
+ }
+ else if (who_exited == webcits_pid) {
+ what_exited = "WebCit HTTPS";
+ }
+ else {
+ what_exited = "unknown";
+ }
+ if (who_exited >= 0) {
+ fprintf(stderr, "ctdlvisor: %d (%s) ended, status=%d\n", who_exited, what_exited, status);
+ }
+ } while (who_exited >= 0);
+ ctdlvisor_exit(0);
+}
+
+
+void detach_from_tty(void) {
+ signal(SIGHUP, SIG_IGN);
+ signal(SIGINT, SIG_IGN);
+ signal(SIGQUIT, SIG_IGN);
+
+ setsid(); // become our own process group leader
+ umask(0);
+ if ( (freopen("/dev/null", "r", stdin) != stdin) ||
+ (freopen("/dev/null", "w", stdout) != stdout) ||
+ (freopen("/dev/null", "w", stderr) != stderr)
+ ) {
+ fprintf(stderr, "sysdep: unable to reopen stdio: %s\n", strerror(errno));
+ }
+}
pid_t start_citadel() {
char bin[1024];
+ char backtrace_filename[PATH_MAX];
sprintf(bin, "%s/usr/local/citadel/citserver", getenv("APPDIR"));
pid_t pid = fork();
if (pid == 0) {
- printf("Executing %s\n", bin);
- execlp(bin, "citserver", "-x9", "-h/usr/local/citadel", NULL);
- perror("execlp");
+ fprintf(stderr, "ctdlvisor: executing %s with data directory %s\n", bin, getenv("CTDL_DIR"));
+ detach_from_tty();
+ sprintf(backtrace_filename, "/tmp/citserver-backtrace.%d", getpid());
+ execlp(bin, "citserver", "-x9", "-h", getenv("CTDL_DIR"), "-b", backtrace_filename, NULL);
exit(errno);
}
else {
+ fprintf(stderr, "ctdlvisor: citserver running on pid=%d\n", pid);
return(pid);
}
}
sprintf(wchome, "-h%s/usr/local/webcit", getenv("APPDIR"));
pid_t pid = fork();
if (pid == 0) {
- printf("Executing %s\n", bin);
- execlp(bin, "webcit", "-x9", wchome, "-p80", "uds", "/usr/local/citadel", NULL);
- perror("execlp");
+ fprintf(stderr, "ctdlvisor: executing %s\n", bin);
+ detach_from_tty();
+ execlp(bin, "webcit", "-x9", wchome, "-p", getenv("HTTP_PORT"), "uds", getenv("CTDL_DIR"), NULL);
exit(errno);
}
else {
+ fprintf(stderr, "ctdlvisor: webcit (HTTP) running on pid=%d\n", pid);
return(pid);
}
}
sprintf(wchome, "-h%s/usr/local/webcit", getenv("APPDIR"));
pid_t pid = fork();
if (pid == 0) {
- printf("Executing %s\n", bin);
- execlp(bin, "webcit", "-x9", wchome, "-s", "-p443", "uds", "/usr/local/citadel", NULL);
- perror("execlp");
+ fprintf(stderr, "ctdlvisor: executing %s\n", bin);
+ detach_from_tty();
+ execlp(bin, "webcit", "-x9", wchome, "-s", "-p", getenv("HTTPS_PORT"), "uds", getenv("CTDL_DIR"), NULL);
exit(errno);
}
else {
+ fprintf(stderr, "ctdlvisor: webcit (HTTPS) running on pid=%d\n", pid);
return(pid);
}
}
-main() {
+void main_loop(void) {
int status;
pid_t who_exited;
-
- pid_t citserver_pid = start_citadel();
- pid_t webcit_pid = start_webcit();
- pid_t webcits_pid = start_webcits();
+ int citserver_exit_code = 0;
do {
- printf("LD_LIBRARY_PATH = %s\n", getenv("LD_LIBRARY_PATH"));
- printf("PATH = %s\n", getenv("PATH"));
- printf("APPDIR = %s\n", getenv("APPDIR"));
-
- printf("waiting...\n");
who_exited = waitpid(-1, &status, 0);
- printf("pid=%d exited, status=%d\n", who_exited, status);
+ fprintf(stderr, "ctdlvisor: pid=%d exited, status=%d, exitcode=%d\n", who_exited, status, WEXITSTATUS(status));
+ // A *deliberate* exit of citserver will cause ctdlvisor to shut the whole AppImage down.
+ // If it crashes, however, we will start it back up.
if (who_exited == citserver_pid) {
- if (WEXITSTATUS(status) == 0) {
- printf("ctdlvisor: citserver exited normally - ending AppImage session\n");
- exit(0);
+ citserver_exit_code = WEXITSTATUS(status);
+ if ((WIFEXITED(status)) && (citserver_exit_code == 0)) {
+ fprintf(stderr, "ctdlvisor: citserver exited normally - ending AppImage session\n");
+ shutting_down = 1;
+ kill(webcit_pid, SIGTERM);
+ kill(webcits_pid, SIGTERM);
+ }
+ else if ((WIFEXITED(status)) && (citserver_exit_code >= 101) && (citserver_exit_code <= 109)) {
+ fprintf(stderr, "ctdlvisor: citserver exited intentionally - ending AppImage session\n");
+ shutting_down = 1;
+ kill(webcit_pid, SIGTERM);
+ kill(webcits_pid, SIGTERM);
+ }
+ else {
+ if (WIFSIGNALED(status)) {
+ fprintf(stderr, "ctdlvisor: citserver crashed on signal %d\n", WTERMSIG(status));
+ }
+ citserver_pid = start_citadel();
}
- citserver_pid = start_citadel();
}
- if (who_exited == webcit_pid) webcit_pid = start_webcit();
- if (who_exited == webcits_pid) webcits_pid = start_webcits();
+ // WebCit processes are restarted if they exit for any reason.
+ if ((who_exited == webcit_pid) && (!shutting_down)) webcit_pid = start_webcit();
+ if ((who_exited == webcits_pid) && (!shutting_down)) webcits_pid = start_webcits();
- sleep(1); // slow down any accidental loops
+ // If we somehow end up in an endless loop, at least slow it down.
+ sleep(1);
} while (who_exited >= 0);
+ ctdlvisor_exit(citserver_exit_code);
+}
+
+
+int main(int argc, char **argv) {
+ int a;
+ int migrate_mode = 0;
+
+ if (getenv("APPDIR") == NULL) {
+ fprintf(stderr, "ctdlvisor: APPDIR is not set. This program must be run from within an AppImage.\n");
+ ctdlvisor_exit(1);
+ }
+
+ /* parse command-line arguments */
+ while ((a=getopt(argc, argv, "cm")) != EOF) switch(a) {
+
+ // test this binary for compatibility and exit
+ case 'c':
+ fprintf(stderr, "%s: binary compatibility confirmed\n", argv[0]);
+ exit(0);
+ break;
+
+ // run ctdlmigrate only
+ case 'm':
+ migrate_mode = 1;
+ break;
+
+ // any other parameter makes it crash and burn
+ default:
+ fprintf(stderr, "usage\n");
+ exit(1);
+ }
+
+ fprintf(stderr, "ctdlvisor: Welcome to the Citadel System, brought to you using AppImage.\n");
+ fprintf(stderr, "ctdlvisor: LD_LIBRARY_PATH = %s\n", getenv("LD_LIBRARY_PATH"));
+ fprintf(stderr, "ctdlvisor: PATH = %s\n", getenv("PATH"));
+ fprintf(stderr, "ctdlvisor: APPDIR = %s\n", getenv("APPDIR"));
+ fprintf(stderr, "ctdlvisor: data directory = %s\n", getenv("CTDL_DIR"));
+ fprintf(stderr, "ctdlvisor: HTTP port = %s\n", getenv("HTTP_PORT"));
+ fprintf(stderr, "ctdlvisor: HTTPS port = %s\n", getenv("HTTPS_PORT"));
+
+ if (access(getenv("CTDL_DIR"), R_OK|W_OK|X_OK)) {
+ fprintf(stderr, "ctdlvisor: %s: %s\n", getenv("CTDL_DIR"), strerror(errno));
+ ctdlvisor_exit(errno);
+ }
+
+ signal(SIGHUP, signal_handler);
+
+ // "migrate mode" means we just start the server and then run ctdlmigrate interactively.
+ if (migrate_mode) {
+ citserver_pid = start_citadel();
+ fprintf(stderr, "ctdlvisor: waiting a moment for citserver to initialize...\n");
+ sleep(5);
+ char bin[1024];
+ sprintf(bin, "%s/usr/local/citadel/ctdlmigrate", getenv("APPDIR"));
+ system(bin);
+ kill(citserver_pid, SIGTERM);
+ }
+
+ // Otherwise, it's just a normal happy day in Citadel land.
+ else {
+ signal(SIGTERM, signal_handler);
+ signal(SIGINT, signal_handler);
+ signal(SIGQUIT, signal_handler);
+
+ citserver_pid = start_citadel();
+ webcit_pid = start_webcit();
+ webcits_pid = start_webcits();
+
+ main_loop();
+ }
- printf("ctdlvisor: exiting.\n");
- exit(0);
+ ctdlvisor_exit(0);
}
projects / citadel.git / blobdiff