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modules-load: parse driver=/rd.driver= kernel command line option

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This generalizes logic that already has been available in dracut before.
This commit is contained in:
Lennart Poettering 2012-06-22 11:39:04 +02:00
parent b79f817b1b
commit 03658d4fd6
2 changed files with 149 additions and 41 deletions
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16
man/kernel-command-line.xml
View File

@ -206,8 +206,8 @@
<term><varname>rd.udev.log-priority=</varname></term>
<term><varname>udev.children-max=</varname></term>
<term><varname>rd.udev.children-max=</varname></term>
<term><varname>udev.udev.exec-delay=</varname></term>
<term><varname>rd.udev.udev.exec-delay=</varname></term>
<term><varname>udev.exec-delay=</varname></term>
<term><varname>rd.udev.exec-delay=</varname></term>
<listitem>
<para>Parameters understood by
@ -256,6 +256,18 @@
</listitem>
</varlistentry>
<varlistentry>
<term><varname>driver=</varname></term>
<term><varname>rd.driver=</varname></term>
<listitem>
<para>Load a specific kernel
boot early at boot. For
details see
<citerefentry><refentrytitle>systemd-modules-load.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>

174
src/modules-load/modules-load.c
View File

@ -32,6 +32,9 @@
#include "util.h"
#include "strv.h"
#include "conf-files.h"
#include "virt.h"
static char **arg_proc_cmdline_modules = NULL;
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wformat-nonliteral"
@ -42,11 +45,120 @@ static void systemd_kmod_log(void *data, int priority, const char *file, int lin
}
#pragma GCC diagnostic pop
int main(int argc, char *argv[]) {
int r = EXIT_FAILURE;
char **files, **fn;
struct kmod_ctx *ctx;
static int add_modules(const char *p) {
char **t, **k;
k = strv_split(p, ",");
if (!k) {
log_error("Out of memory");
return -ENOMEM;
}
t = strv_merge(arg_proc_cmdline_modules, k);
strv_free(k);
if (!t) {
log_error("Out of memory");
return -ENOMEM;
}
strv_free(arg_proc_cmdline_modules);
arg_proc_cmdline_modules = t;
return 0;
}
static int parse_proc_cmdline(void) {
char *line, *w, *state;
int r;
size_t l;
if (detect_container(NULL) > 0)
return 0;
r = read_one_line_file("/proc/cmdline", &line);
if (r < 0) {
log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
return 0;
}
FOREACH_WORD_QUOTED(w, l, line, state) {
char *word;
word = strndup(w, l);
if (!word) {
r = -ENOMEM;
goto finish;
}
if (startswith(word, "driver=")) {
r = add_modules(word + 7);
if (r < 0)
goto finish;
} else if (startswith(word, "rd.driver=")) {
if (in_initrd()) {
r = add_modules(word + 10);
if (r < 0)
goto finish;
}
}
free(word);
}
r = 0;
finish:
free(line);
return r;
}
static int load_module(struct kmod_ctx *ctx, const char *m) {
const int probe_flags = KMOD_PROBE_APPLY_BLACKLIST|KMOD_PROBE_IGNORE_LOADED;
struct kmod_list *itr, *modlist = NULL;
int r = 0;
log_debug("load: %s\n", m);
r = kmod_module_new_from_lookup(ctx, m, &modlist);
if (r < 0) {
log_error("Failed to lookup alias '%s': %s", m, strerror(-r));
return r;
}
kmod_list_foreach(itr, modlist) {
struct kmod_module *mod;
int err;
mod = kmod_module_get_module(itr);
err = kmod_module_probe_insert_module(mod, probe_flags,
NULL, NULL, NULL, NULL);
if (err == 0)
log_info("Inserted module '%s'", kmod_module_get_name(mod));
else if (err == KMOD_PROBE_APPLY_BLACKLIST)
log_info("Module '%s' is blacklisted", kmod_module_get_name(mod));
else {
log_error("Failed to insert '%s': %s", kmod_module_get_name(mod),
strerror(-err));
r = err;
}
kmod_module_unref(mod);
}
kmod_module_unref_list(modlist);
return r;
}
int main(int argc, char *argv[]) {
int r = EXIT_FAILURE, k;
char **files, **fn, **i;
struct kmod_ctx *ctx;
if (argc > 1) {
log_error("This program takes no argument.");
@ -59,6 +171,9 @@ int main(int argc, char *argv[]) {
umask(0022);
if (parse_proc_cmdline() < 0)
return EXIT_FAILURE;
ctx = kmod_new(NULL, NULL);
if (!ctx) {
log_error("Failed to allocate memory for kmod.");
@ -66,10 +181,17 @@ int main(int argc, char *argv[]) {
}
kmod_load_resources(ctx);
kmod_set_log_fn(ctx, systemd_kmod_log, NULL);
if (conf_files_list(&files, ".conf",
r = EXIT_SUCCESS;
STRV_FOREACH(i, arg_proc_cmdline_modules) {
k = load_module(ctx, *i);
if (k < 0)
r = EXIT_FAILURE;
}
k = conf_files_list(&files, ".conf",
"/etc/modules-load.d",
"/run/modules-load.d",
"/usr/local/lib/modules-load.d",
@ -77,13 +199,13 @@ int main(int argc, char *argv[]) {
#ifdef HAVE_SPLIT_USR
"/lib/modules-load.d",
#endif
NULL) < 0) {
log_error("Failed to enumerate modules-load.d files: %s", strerror(-r));
NULL);
if (k < 0) {
log_error("Failed to enumerate modules-load.d files: %s", strerror(-k));
r = EXIT_FAILURE;
goto finish;
}
r = EXIT_SUCCESS;
STRV_FOREACH(fn, files) {
FILE *f;
@ -100,8 +222,6 @@ int main(int argc, char *argv[]) {
log_debug("apply: %s\n", *fn);
for (;;) {
char line[LINE_MAX], *l;
struct kmod_list *itr, *modlist = NULL;
int err;
if (!fgets(line, sizeof(line), f))
break;
@ -110,34 +230,9 @@ int main(int argc, char *argv[]) {
if (*l == '#' || *l == 0)
continue;
err = kmod_module_new_from_lookup(ctx, l, &modlist);
if (err < 0) {
log_error("Failed to lookup alias '%s'", l);
k = load_module(ctx, l);
if (k < 0)
r = EXIT_FAILURE;
continue;
}
kmod_list_foreach(itr, modlist) {
struct kmod_module *mod;
mod = kmod_module_get_module(itr);
err = kmod_module_probe_insert_module(mod, probe_flags,
NULL, NULL, NULL, NULL);
if (err == 0)
log_info("Inserted module '%s'", kmod_module_get_name(mod));
else if (err == KMOD_PROBE_APPLY_BLACKLIST)
log_info("Module '%s' is blacklisted", kmod_module_get_name(mod));
else {
log_error("Failed to insert '%s': %s", kmod_module_get_name(mod),
strerror(-err));
r = EXIT_FAILURE;
}
kmod_module_unref(mod);
}
kmod_module_unref_list(modlist);
}
if (ferror(f)) {
@ -151,6 +246,7 @@ int main(int argc, char *argv[]) {
finish:
strv_free(files);
kmod_unref(ctx);
strv_free(arg_proc_cmdline_modules);
return r;
}