#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>
+
+char *data_directory = "/usr/local/citadel";
+char *http_port = "80";
+char *https_port = "443";
+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";
+ }
+ fprintf(stderr, "ctdlvisor: pid=%d (%s) exited, status=%d, exitcode=%d\n", who_exited, what_exited, status, WEXITSTATUS(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() {
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\n", bin);
+ detach_from_tty();
+ execlp(bin, "citserver", "-x9", "-h", data_directory, NULL);
exit(errno);
}
else {
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", http_port, "uds", data_directory, NULL);
exit(errno);
}
else {
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", https_port, "uds", data_directory, NULL);
exit(errno);
}
else {
}
-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");
+ fprintf(stderr, "ctdlvisor: waiting for any child process to exit...\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 (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 ((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 {
+ 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);
+}
+
+
+void run_in_foreground(void) {
+ 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", data_directory);
+ fprintf(stderr, "ctdlvisor: HTTP port = %s\n", http_port);
+ fprintf(stderr, "ctdlvisor: HTTPS port = %s\n", https_port);
+
+ if (access(data_directory, R_OK|W_OK|X_OK)) {
+ fprintf(stderr, "ctdlvisor: %s: %s\n", data_directory, strerror(errno));
+ ctdlvisor_exit(errno);
+ }
+
+ signal(SIGTERM, signal_handler);
+ signal(SIGHUP, signal_handler);
+ signal(SIGINT, signal_handler);
+ signal(SIGQUIT, signal_handler);
+
+ citserver_pid = start_citadel();
+ webcit_pid = start_webcit();
+ webcits_pid = start_webcits();
+
+ main_loop();
+ ctdlvisor_exit(0);
+}
+
+
+void install_as_service(void) {
+
+ // FIXME fail if some other citadel distribution is already there
+ // FIXME fail if any server processes are running
+ // FIXME interact with the user
+ // FIXME get port numbers and data directory
+ // FIXME create the data directory
+ // FIXME move the appimage into its permanent location
+
+ fprintf(stderr, "Installing as service\n");
+
+ FILE *fp = fopen("/etc/systemd/system/ctdl.service", "w");
+ fprintf(fp, "# This unit file starts all Citadel services via the AppImage distribution.\n"
+ "[Unit]\n"
+ "Description=Citadel\n"
+ "After=network.target\n"
+ "[Service]\n"
+ "ExecStart=/root/citadel/appimage/Citadel-x86_64.AppImage run -h %s -s %s -s %s\n"
+ "ExecStop=/bin/kill $MAINPID\n"
+ "KillMode=process\n"
+ "Restart=on-failure\n"
+ "LimitCORE=infinity\n"
+ "[Install]\n"
+ "WantedBy=multi-user.target\n"
+ ,
+ data_directory, http_port, https_port
+ );
+ fclose(fp);
+
+ fprintf(stderr, "systemd unit file is installed. Type 'systemctl enable ctdl' to have it start at boot.\n");
+}
+
+
+static char *usage =
+ "\n"
+ "ctdlvisor: usage: ctdlvisor [-h data_directory] [-p http_port] [-s https_port] command\n"
+ " 'command' must be one of: run, install, remove, upgrade, test, help\n"
+ "\n"
+;
+
+int main(int argc, char **argv) {
+ int c;
+
+ if (getenv("APPDIR") == NULL) {
+ fprintf(stderr, "ctdlvisor: APPDIR is not set. This program must be run from within an AppImage.\n");
+ ctdlvisor_exit(1);
+ }
+
+ while ((c = getopt (argc, argv, "h:p:s:")) != -1) switch(c) {
+ case 'h':
+ data_directory = optarg;
+ break;
+ case 'p':
+ http_port = optarg;
+ break;
+ case 's':
+ https_port = optarg;
+ break;
+ default:
+ fprintf(stderr, "%s", usage);
+ ctdlvisor_exit(1);
+ }
+
+
+ if (argc != optind+1) {
+ fprintf(stderr, "%s", usage);
+ ctdlvisor_exit(1);
+ }
+
+ if (!strcasecmp(argv[optind], "run")) {
+ run_in_foreground();
+ }
+ else if (!strcasecmp(argv[optind], "install")) {
+ install_as_service();
+ }
+ else if (!strcasecmp(argv[optind], "remove")) {
+ fprintf(stderr, "oops, this is not implemented yet\n");
+ }
+ else if (!strcasecmp(argv[optind], "upgrade")) {
+ fprintf(stderr, "oops, this is not implemented yet\n");
+ }
+ else if (!strcasecmp(argv[optind], "test")) {
+ fprintf(stderr, "oops, this is not implemented yet\n");
+ }
+ else if (!strcasecmp(argv[optind], "help")) {
+ fprintf(stderr, "%s", usage);
+ fprintf(stderr, "[-h dir] Use 'dir' as the Citadel data directory (this directory must exist)\n"
+ "[-p port] Listen for HTTP connections on 'port'\n"
+ "[-s port] Listen for HTTPS connections on 'port'\n"
+ "'command' must be one of:\n"
+ " run - launch Citadel services (does not detach from terminal)\n"
+ " install - create systemd unit files for automatic startup at boot\n"
+ " remove - delete systemd unit files to end automatic startup\n"
+ " upgrade - download and install a new version of this appimage\n"
+ " test - test the appimage for binary compatibility with this host\n"
+ " help - display this message\n"
+ "\n"
+ );
+ }
+ else {
+ fprintf(stderr, "%s", usage);
+ ctdlvisor_exit(1);
+ }
- printf("ctdlvisor: exiting.\n");
- exit(0);
+ ctdlvisor_exit(0);
}
projects / citadel.git / blobdiff