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getty-generator: look add an environment variable $container_ttys set for PID 1 and start gettys on all ttys listed therein

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Lennart Poettering 2013-12-13 16:37:58 +01:00
parent f4889f656b
commit 1d97ff7dd7
1 changed files with 49 additions and 0 deletions
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49
src/getty-generator/getty-generator.c
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@ -29,6 +29,7 @@
#include "unit-name.h"
#include "virt.h"
#include "fileio.h"
#include "path-util.h"
static const char *arg_dest = "/tmp";
@ -77,6 +78,20 @@ static int add_serial_getty(const char *tty) {
return add_symlink("serial-getty@.service", n);
}
static int add_container_getty(const char *tty) {
_cleanup_free_ char *n = NULL;
assert(tty);
log_debug("Automatically adding container getty for /dev/pts/%s.", tty);
n = unit_name_replace_instance("container-getty@.service", tty);
if (!n)
return log_oom();
return add_symlink("container-getty@.service", n);
}
int main(int argc, char *argv[]) {
static const char virtualization_consoles[] =
@ -86,6 +101,7 @@ int main(int argc, char *argv[]) {
_cleanup_free_ char *active = NULL;
const char *j;
int r;
if (argc > 1 && argc != 4) {
log_error("This program takes three or no arguments.");
@ -102,11 +118,44 @@ int main(int argc, char *argv[]) {
umask(0022);
if (detect_container(NULL) > 0) {
_cleanup_free_ char *container_ttys = NULL;
log_debug("Automatically adding console shell.");
if (add_symlink("console-getty.service", "console-getty.service") < 0)
return EXIT_FAILURE;
/* When $container_ttys is set for PID 1, spawn
* gettys on all ptys named therein. Note that despite
* the variable name we only support ptys here. */
r = getenv_for_pid(1, "container_ttys", &container_ttys);
if (r >= 0) {
char *w, *state;
size_t l;
FOREACH_WORD(w, l, container_ttys, state) {
const char *t;
char tty[l + 1];
memcpy(tty, w, l);
tty[l] = 0;
/* First strip off /dev/ if it is specified */
t = path_startswith(tty, "/dev/");
if (!t)
t = tty;
/* Then, make sure it's actually a pty */
t = path_startswith(tty, "pts/");
if (!t)
continue;
if (add_container_getty(t) < 0)
return EXIT_FAILURE;
}
}
/* Don't add any further magic if we are in a container */
return EXIT_SUCCESS;
}