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getty-generator: Use device hotplug to instantiate virtualizer consoles

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If getty-generator runs in the initrd, the corresponding tty might not
have been instantiated yet in /dev, which means a serial getty is not
spawned on it. Instead, let's instantiate the serial-getty when the
device appears so that it always gets instantiated.
This commit is contained in:
Daan De Meyer 2023-04-18 00:46:11 +02:00
parent b3a062cb80
commit e7e6ce5f8d
1 changed files with 17 additions and 13 deletions
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30
src/getty-generator/getty-generator.c
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@ -23,15 +23,21 @@
static const char *arg_dest = NULL;
static bool arg_enabled = true;
static int add_symlink(const char *fservice, const char *tservice) {
char *from, *to;
static int add_symlink(const char *wants, const char *fservice, const char *tservice) {
_cleanup_free_ char *from = NULL, *to = NULL;
int r;
assert(wants);
assert(fservice);
assert(tservice);
from = strjoina(SYSTEM_DATA_UNIT_DIR "/", fservice);
to = strjoina(arg_dest, "/getty.target.wants/", tservice);
from = path_join(SYSTEM_DATA_UNIT_DIR, fservice);
if (!from)
return -ENOMEM;
to = path_join(arg_dest, wants, tservice);
if (!to)
return -ENOMEM;
(void) mkdir_parents_label(to, 0755);
@ -47,7 +53,7 @@ static int add_symlink(const char *fservice, const char *tservice) {
return 0;
}
static int add_serial_getty(const char *tty) {
static int add_serial_getty(const char *wants ,const char *tty) {
_cleanup_free_ char *n = NULL;
int r;
@ -59,7 +65,7 @@ static int add_serial_getty(const char *tty) {
if (r < 0)
return log_error_errno(r, "Failed to generate service name: %m");
return add_symlink("serial-getty@.service", n);
return add_symlink(wants, "serial-getty@.service", n);
}
static int add_container_getty(const char *tty) {
@ -74,7 +80,7 @@ static int add_container_getty(const char *tty) {
if (r < 0)
return log_error_errno(r, "Failed to generate service name: %m");
return add_symlink("container-getty@.service", n);
return add_symlink("getty.target.wants", "container-getty@.service", n);
}
static int verify_tty(const char *name) {
@ -107,7 +113,7 @@ static int run_container(void) {
log_debug("Automatically adding console shell.");
r = add_symlink("console-getty.service", "console-getty.service");
r = add_symlink("getty.target.wants", "console-getty.service", "console-getty.service");
if (r < 0)
return r;
@ -209,7 +215,7 @@ static int run(const char *dest, const char *dest_early, const char *dest_late)
if (verify_tty(tty) < 0)
continue;
r = add_serial_getty(tty);
r = add_serial_getty("getty.target.wants", tty);
if (r < 0)
return r;
}
@ -224,13 +230,11 @@ static int run(const char *dest, const char *dest_early, const char *dest_late)
"3270!tty1") {
_cleanup_free_ char *p = NULL;
p = path_join("/sys/class/tty", j);
p = strjoin("dev-", j, ".device.wants");
if (!p)
return -ENOMEM;
if (access(p, F_OK) < 0)
continue;
r = add_serial_getty(j);
r = add_serial_getty(p, j);
if (r < 0)
return r;
}