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freebsd/usr.sbin/sysinstall/system.c
David E. O'Brien 36d4953214 Make logic more readable.
2004-11-19 03:52:41 +00:00

543 lines
12 KiB
C
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/*
* The new sysinstall program.
*
* This is probably the last program in the `sysinstall' line - the next
* generation being essentially a complete rewrite.
*
* $FreeBSD$
*
* Jordan Hubbard
*
* My contributions are in the public domain.
*
* Parts of this file are also blatently stolen from Poul-Henning Kamp's
* previous version of sysinstall, and as such fall under his "BEERWARE license"
* so buy him a beer if you like it! Buy him a beer for me, too!
* Heck, get him completely drunk and send me pictures! :-)
*/
#include "sysinstall.h"
#include <signal.h>
#include <termios.h>
#include <sys/param.h>
#include <sys/reboot.h>
#include <sys/consio.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <ufs/ufs/ufsmount.h>
/* Where we stick our temporary expanded doc file */
#define DOC_TMP_DIR "/tmp/.doc"
#define DOC_TMP_FILE "/tmp/.doc/doc.tmp"
static pid_t ehs_pid;
/*
* Handle interrupt signals - this probably won't work in all cases
* due to our having bogotified the internal state of dialog or curses,
* but we'll give it a try.
*/
static int
intr_continue(dialogMenuItem *self)
{
return DITEM_LEAVE_MENU;
}
static int
intr_reboot(dialogMenuItem *self)
{
systemShutdown(-1);
/* NOTREACHED */
return 0;
}
static int
intr_restart(dialogMenuItem *self)
{
int ret, fd, fdmax;
mediaClose();
free_variables();
fdmax = getdtablesize();
for (fd = 3; fd < fdmax; fd++)
close(fd);
ret = execl(StartName, StartName, "-restart", (char *)NULL);
msgDebug("execl failed (%s)\n", strerror(errno));
/* NOTREACHED */
return -1;
}
static dialogMenuItem intrmenu[] = {
{ "Abort", "Abort the installation", NULL, intr_reboot },
{ "Restart", "Restart the installation program", NULL, intr_restart },
{ "Continue", "Continue the installation", NULL, intr_continue },
};
static void
handle_intr(int sig)
{
WINDOW *save = savescr();
use_helpline(NULL);
use_helpfile(NULL);
if (OnVTY) {
ioctl(0, VT_ACTIVATE, 1); /* Switch back */
msgInfo(NULL);
}
(void)dialog_menu("Installation interrupt",
"Do you want to abort the installation?",
-1, -1, 3, -3, intrmenu, NULL, NULL, NULL);
restorescr(save);
}
/*
* Harvest children if we are init.
*/
static void
reap_children(int sig)
{
int errbak = errno;
while (waitpid(-1, NULL, WNOHANG) > 0)
;
errno = errbak;
}
/* Expand a file into a convenient location, nuking it each time */
static char *
expand(char *fname)
{
char *gunzip = RunningAsInit ? "/stand/gunzip" : "/usr/bin/gunzip";
if (!directory_exists(DOC_TMP_DIR)) {
Mkdir(DOC_TMP_DIR);
if (chown(DOC_TMP_DIR, 0, 0) < 0)
return NULL;
if (chmod(DOC_TMP_DIR, S_IRWXU) < 0)
return NULL;
}
else
unlink(DOC_TMP_FILE);
if (!file_readable(fname) || vsystem("%s < %s > %s", gunzip, fname, DOC_TMP_FILE))
return NULL;
return DOC_TMP_FILE;
}
/* Initialize system defaults */
void
systemInitialize(int argc, char **argv)
{
size_t i;
int boothowto;
sigset_t signalset;
signal(SIGINT, SIG_IGN);
globalsInit();
i = sizeof(boothowto);
if (!sysctlbyname("debug.boothowto", &boothowto, &i, NULL, 0) &&
(i == sizeof(boothowto)) && (boothowto & RB_VERBOSE))
variable_set2(VAR_DEBUG, "YES", 0);
/* Are we running as init? */
if (getpid() == 1) {
struct ufs_args ufs_args;
int fd;
RunningAsInit = 1;
setsid();
close(0);
fd = open("/dev/ttyv0", O_RDWR);
if (fd == -1) {
fd = open("/dev/console", O_RDWR); /* fallback */
variable_set2(VAR_FIXIT_TTY, "serial", 0); /* give fixit a hint */
} else
OnVTY = TRUE;
/*
* To make _sure_ we're on a VTY and don't have /dev/console switched
* away to a serial port or something, attempt to set the cursor appearance.
*/
if (OnVTY) {
int fd2, type;
type = 0; /* normal */
if ((fd2 = open("/dev/console", O_RDWR)) != -1) {
if (ioctl(fd2, CONS_CURSORTYPE, &type) == -1) {
OnVTY = FALSE;
variable_set2(VAR_FIXIT_TTY, "serial", 0); /* Tell Fixit
the console
type */
close(fd); close(fd2);
open("/dev/console", O_RDWR);
}
else
close(fd2);
}
}
close(1); dup(0);
close(2); dup(0);
printf("%s running as init on %s\n", argv[0], OnVTY ? "vty0" : "serial console");
ioctl(0, TIOCSCTTY, (char *)NULL);
setlogin("root");
setenv("PATH", "/stand:/bin:/sbin:/usr/sbin:/usr/bin:/mnt/bin:/mnt/sbin:/mnt/usr/sbin:/mnt/usr/bin:/usr/X11R6/bin", 1);
setbuf(stdin, 0);
setbuf(stderr, 0);
#ifdef __alpha__
i = 0;
sysctlbyname("machdep.unaligned_print", NULL, 0, &i, sizeof(i));
#endif
#if 0
signal(SIGCHLD, reap_children);
#endif
memset(&ufs_args, 0, sizeof(ufs_args));
mount("ufs", "/", MNT_UPDATE, &ufs_args);
}
else {
char hname[256];
/* Initalize various things for a multi-user environment */
if (!gethostname(hname, sizeof hname))
variable_set2(VAR_HOSTNAME, hname, 0);
}
if (set_termcap() == -1) {
printf("Can't find terminal entry\n");
exit(-1);
}
/* XXX - libdialog has particularly bad return value checking */
init_dialog();
/* If we haven't crashed I guess dialog is running ! */
DialogActive = TRUE;
/* Make sure HOME is set for those utilities that need it */
if (!getenv("HOME"))
setenv("HOME", "/", 1);
signal(SIGINT, handle_intr);
/*
* Make sure we can be interrupted even if we were re-executed
* from an interrupt.
*/
sigemptyset(&signalset);
sigaddset(&signalset, SIGINT);
sigprocmask(SIG_UNBLOCK, &signalset, NULL);
(void)vsystem("rm -rf %s", DOC_TMP_DIR);
}
/* Close down and prepare to exit */
void
systemShutdown(int status)
{
/* If some media is open, close it down */
if (status >=0)
mediaClose();
/* write out any changes to rc.conf .. */
configRC_conf();
/* Shut down the dialog library */
if (DialogActive) {
end_dialog();
DialogActive = FALSE;
}
/* Shut down curses */
endwin();
/* If we have a temporary doc dir lying around, nuke it */
(void)vsystem("rm -rf %s", DOC_TMP_DIR);
/* REALLY exit! */
if (RunningAsInit) {
/* Put the console back */
ioctl(0, VT_ACTIVATE, 2);
#if defined(__alpha__) || defined(__sparc64__)
reboot(RB_HALT);
#else
reboot(0);
#endif
}
else
exit(status);
}
/* Run some general command */
int
systemExecute(char *command)
{
int status;
struct termios foo;
WINDOW *w = savescr();
dialog_clear();
dialog_update();
end_dialog();
DialogActive = FALSE;
if (tcgetattr(0, &foo) != -1) {
foo.c_cc[VERASE] = '\010';
tcsetattr(0, TCSANOW, &foo);
}
if (!Fake)
status = system(command);
else {
status = 0;
msgDebug("systemExecute: Faked execution of `%s'\n", command);
}
DialogActive = TRUE;
restorescr(w);
return status;
}
/* suspend/resume libdialog/curses screen */
static WINDOW *oldW;
void
systemSuspendDialog(void)
{
oldW = savescr();
dialog_clear();
dialog_update();
end_dialog();
DialogActive = FALSE;
}
void
systemResumeDialog(void)
{
DialogActive = TRUE;
restorescr(oldW);
}
/* Display a help file in a filebox */
int
systemDisplayHelp(char *file)
{
char *fname = NULL;
char buf[FILENAME_MAX];
int ret = 0;
WINDOW *w = savescr();
fname = systemHelpFile(file, buf);
if (!fname) {
snprintf(buf, FILENAME_MAX, "The %s file is not provided on this particular floppy image.", file);
use_helpfile(NULL);
use_helpline(NULL);
dialog_mesgbox("Sorry!", buf, -1, -1);
ret = 1;
}
else {
use_helpfile(NULL);
use_helpline(NULL);
dialog_textbox(file, fname, LINES, COLS);
}
restorescr(w);
return ret;
}
char *
systemHelpFile(char *file, char *buf)
{
if (!file)
return NULL;
if (file[0] == '/')
return file;
snprintf(buf, FILENAME_MAX, "/stand/help/%s.hlp.gz", file);
if (file_readable(buf))
return expand(buf);
snprintf(buf, FILENAME_MAX, "/stand/help/%s.hlp", file);
if (file_readable(buf))
return expand(buf);
snprintf(buf, FILENAME_MAX, "/stand/help/%s.TXT.gz", file);
if (file_readable(buf))
return expand(buf);
snprintf(buf, FILENAME_MAX, "/stand/help/%s.TXT", file);
if (file_readable(buf))
return expand(buf);
snprintf(buf, FILENAME_MAX, "/usr/src/usr.sbin/sysinstall/help/%s.hlp", file);
if (file_readable(buf))
return buf;
snprintf(buf, FILENAME_MAX, "/usr/src/usr.sbin/sysinstall/help/%s.TXT", file);
if (file_readable(buf))
return buf;
return NULL;
}
void
systemChangeTerminal(char *color, const u_char c_term[],
char *mono, const u_char m_term[])
{
if (OnVTY) {
int setupterm(char *color, int, int *);
if (ColorDisplay) {
setenv("TERM", color, 1);
setenv("TERMCAP", c_term, 1);
reset_shell_mode();
setterm(color);
cbreak(); noecho();
}
else {
setenv("TERM", mono, 1);
setenv("TERMCAP", m_term, 1);
reset_shell_mode();
setterm(mono);
cbreak(); noecho();
}
}
clear();
refresh();
dialog_clear();
}
int
vsystem(char *fmt, ...)
{
va_list args;
int pstat;
pid_t pid;
int omask;
sig_t intsave, quitsave;
char *cmd;
int i;
cmd = (char *)alloca(FILENAME_MAX);
cmd[0] = '\0';
va_start(args, fmt);
vsnprintf(cmd, FILENAME_MAX, fmt, args);
va_end(args);
omask = sigblock(sigmask(SIGCHLD));
if (Fake) {
msgDebug("vsystem: Faked execution of `%s'\n", cmd);
return 0;
}
if (isDebug())
msgDebug("Executing command `%s'\n", cmd);
pid = fork();
if (pid == -1) {
(void)sigsetmask(omask);
i = 127;
}
else if (!pid) { /* Junior */
(void)sigsetmask(omask);
if (DebugFD != -1) {
dup2(DebugFD, 0);
dup2(DebugFD, 1);
dup2(DebugFD, 2);
}
else {
close(1); open("/dev/null", O_WRONLY);
dup2(1, 2);
}
if (RunningAsInit)
execl("/stand/sh", "/stand/sh", "-c", cmd, (char *)NULL);
else
execl("/bin/sh", "/bin/sh", "-c", cmd, (char *)NULL);
exit(1);
}
else {
intsave = signal(SIGINT, SIG_IGN);
quitsave = signal(SIGQUIT, SIG_IGN);
pid = waitpid(pid, &pstat, 0);
(void)sigsetmask(omask);
(void)signal(SIGINT, intsave);
(void)signal(SIGQUIT, quitsave);
i = (pid == -1) ? -1 : WEXITSTATUS(pstat);
if (isDebug())
msgDebug("Command `%s' returns status of %d\n", cmd, i);
}
return i;
}
void
systemCreateHoloshell(void)
{
int waitstatus;
if ((FixItMode || OnVTY) && RunningAsInit) {
if (ehs_pid != 0) {
int pstat;
if (kill(ehs_pid, 0) == 0) {
if (msgNoYes("There seems to be an emergency holographic shell\n"
"already running on VTY 4.\n\n"
"Kill it and start a new one?"))
return;
/* try cleaning up as much as possible */
(void) kill(ehs_pid, SIGHUP);
sleep(1);
(void) kill(ehs_pid, SIGKILL);
}
/* avoid too many zombies */
(void) waitpid(ehs_pid, &pstat, WNOHANG);
}
if (strcmp(variable_get(VAR_FIXIT_TTY), "serial") == 0)
systemSuspendDialog(); /* must be before the fork() */
if ((ehs_pid = fork()) == 0) {
int i, fd;
struct termios foo;
extern int login_tty(int);
ioctl(0, TIOCNOTTY, NULL);
for (i = getdtablesize(); i >= 0; --i)
close(i);
if (strcmp(variable_get(VAR_FIXIT_TTY), "serial") == 0)
fd = open("/dev/console", O_RDWR);
else
fd = open("/dev/ttyv3", O_RDWR);
ioctl(0, TIOCSCTTY, &fd);
dup2(0, 1);
dup2(0, 2);
DebugFD = 2;
if (login_tty(fd) == -1)
msgDebug("Doctor: I can't set the controlling terminal.\n");
signal(SIGTTOU, SIG_IGN);
if (tcgetattr(fd, &foo) != -1) {
foo.c_cc[VERASE] = '\010';
if (tcsetattr(fd, TCSANOW, &foo) == -1)
msgDebug("Doctor: I'm unable to set the erase character.\n");
}
else
msgDebug("Doctor: I'm unable to get the terminal attributes!\n");
if (strcmp(variable_get(VAR_FIXIT_TTY), "serial") == 0) {
printf("Type ``exit'' in this fixit shell to resume sysinstall.\n\n");
fflush(stdout);
}
execlp("sh", "-sh", 0);
msgDebug("Was unable to execute sh for Holographic shell!\n");
exit(1);
}
else {
if (strcmp(variable_get(VAR_FIXIT_TTY), "standard") == 0) {
WINDOW *w = savescr();
msgNotify("Starting an emergency holographic shell on VTY4");
sleep(2);
restorescr(w);
}
else {
(void)waitpid(ehs_pid, &waitstatus, 0); /* we only wait for
shell to finish
it serial mode
since there is no
virtual console */
systemResumeDialog();
}
}
}
}
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