X-Git-Url: https://code.citadel.org/?a=blobdiff_plain;f=appimage%2Fctdlvisor.c;h=3c7be88cc514159689e7012f2e8cccf4d2f65470;hb=8779ae0fd227b721c5244857956f578fc4af2149;hp=63230afaef3338132212cb9105dbc0f7fe6f6c38;hpb=eb57280f825bc3d1cf0879f5ec6be1d81994c720;p=citadel.git diff --git a/appimage/ctdlvisor.c b/appimage/ctdlvisor.c index 63230afae..3c7be88cc 100644 --- a/appimage/ctdlvisor.c +++ b/appimage/ctdlvisor.c @@ -1,26 +1,90 @@ -// // This is a supervisor program that handles start/stop/restart of // the various Citadel System components, when we are running on // an AppImage instance. // // Copyright (c) 2021 by the citadel.org team // -// 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. -// -// This program is distributed in the hope that it will be useful, -// but WITHOUT ANY WARRANTY; without even the implied warranty of -// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -// GNU General Public License for more details. - +// This program is open source software. Use, duplication, or disclosure +// is subject to the terms of the GNU General Public License, version 3. +// The program is distributed without any warranty, expressed or implied. #include #include #include #include #include +#include +#include +#include +#include +#include + +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() { @@ -28,12 +92,13 @@ 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 with data directory %s\n", bin, getenv("CTDL_DIR")); + detach_from_tty(); + execlp(bin, "citserver", "-x9", "-h", getenv("CTDL_DIR"), NULL); exit(errno); } else { + fprintf(stderr, "ctdlvisor: citserver running on pid=%d\n", pid); return(pid); } } @@ -42,14 +107,17 @@ pid_t start_citadel() { pid_t start_webcit() { char bin[1024]; sprintf(bin, "%s/usr/local/webcit/webcit", getenv("APPDIR")); + char wchome[1024]; + 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", "-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); } } @@ -58,51 +126,134 @@ pid_t start_webcit() { pid_t start_webcits() { char bin[1024]; sprintf(bin, "%s/usr/local/webcit/webcit", getenv("APPDIR")); + char wchome[1024]; + 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", "-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 -h %s", getenv("APPDIR"), getenv("CTDL_DIR")); + 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); }