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getty-generator: add kernel cmdline and env vars to disable it

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systemd.getty_auto/rd.systemd.getty_auto/SYSTEMD_GETTY_AUTO can be used
to disable the generator. Enabled by default.
This commit is contained in:
Luca Boccassi 2021-11-17 17:28:54 +00:00 committed by Luca Boccassi
parent 3510cef8fa
commit ee3fddcc8a
2 changed files with 73 additions and 0 deletions
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33
man/systemd-getty-generator.xml
View file

@ -53,10 +53,43 @@
Elsewhere)</ulink>.</para>
</refsect1>
<refsect1>
<title>Kernel Command Line</title>
<para><filename>systemd-getty-generator</filename> understands the following
<citerefentry><refentrytitle>kernel-command-line</refentrytitle><manvolnum>7</manvolnum></citerefentry>
parameters:</para>
<variablelist class='kernel-commandline-options'>
<varlistentry>
<term><varname>systemd.getty_auto=</varname></term>
<listitem><para>this options take an optional boolean argument, and default to yes.
The generator is enabled by default, and a false value may be used to disable it.
</para></listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Environment</title>
<variablelist class='environment-variables'>
<varlistentry>
<term><varname>$SYSTEMD_GETTY_AUTO</varname></term>
<listitem><para>This variable takes an optional boolean argument, and default to yes.
The generator is enabled by default, and a false value may be used to disable it.
</para></listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>kernel-command-line</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>agetty</refentrytitle><manvolnum>8</manvolnum></citerefentry>
</para>
</refsect1>

40
src/getty-generator/getty-generator.c
View file

@ -11,8 +11,10 @@
#include "generator.h"
#include "log.h"
#include "mkdir-label.h"
#include "parse-util.h"
#include "path-util.h"
#include "process-util.h"
#include "proc-cmdline.h"
#include "strv.h"
#include "terminal-util.h"
#include "unit-name.h"
@ -20,6 +22,7 @@
#include "virt.h"
static const char *arg_dest = NULL;
static bool arg_enabled = true;
static int add_symlink(const char *fservice, const char *tservice) {
char *from, *to;
@ -139,11 +142,48 @@ static int run_container(void) {
}
}
static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
int r;
assert(key);
if (proc_cmdline_key_streq(key, "systemd.getty_auto")) {
r = value ? parse_boolean(value) : 1;
if (r < 0)
log_warning_errno(r, "Failed to parse getty_auto switch \"%s\", ignoring: %m", value);
else
arg_enabled = r;
}
return 0;
}
static int run(const char *dest, const char *dest_early, const char *dest_late) {
_cleanup_free_ char *getty_auto = NULL;
int r;
assert_se(arg_dest = dest);
r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, 0);
if (r < 0)
log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
r = getenv_for_pid(1, "SYSTEMD_GETTY_AUTO", &getty_auto);
if (r < 0)
log_warning_errno(r, "Failed to parse $SYSTEMD_GETTY_AUTO environment variable, ignoring: %m");
else if (r > 0) {
r = parse_boolean(getty_auto);
if (r < 0)
log_warning_errno(r, "Failed to parse $SYSTEMD_GETTY_AUTO value \"%s\", ignoring: %m", getty_auto);
else
arg_enabled = r;
}
if (!arg_enabled) {
log_debug("Disabled, exiting.");
return 0;
}
if (detect_container() > 0)
/* Add console shell and look at $container_ttys, but don't do add any
* further magic if we are in a container. */