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kernel-install: add command to list installed kernels

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This simply dumps the dirs in /usr/lib/modules/ and whether they contain
a vmlinuz binary.
This commit is contained in:
Lennart Poettering 2023-11-06 10:30:58 +01:00
parent 6a20a9d286
commit 658e6cc4ae
2 changed files with 98 additions and 8 deletions
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15
man/kernel-install.xml
View file

@ -44,6 +44,11 @@
<arg choice="opt"><replaceable>KERNEL-IMAGE</replaceable></arg>
<arg choice="opt" rep="repeat"><replaceable>INITRD-FILE</replaceable></arg>
</cmdsynopsis>
<cmdsynopsis>
<command>kernel-install</command>
<arg choice="opt" rep="repeat">OPTIONS</arg>
<arg choice="plain">list</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
@ -190,6 +195,15 @@
<xi:include href="version-info.xml" xpointer="v251"/>
</listitem>
</varlistentry>
<varlistentry>
<term><command>list</command></term>
<listitem>
<para>Shows the various installed kernels. This enumerates the subdirectories of
<filename>/usr/lib/modules/</filename>, and shows whether a kernel image is installed there.</para>
<xi:include href="version-info.xml" xpointer="v255"/>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
@ -332,6 +346,7 @@
<xi:include href="standard-options.xml" xpointer="no-pager"/>
<xi:include href="standard-options.xml" xpointer="json" />
<xi:include href="standard-options.xml" xpointer="image-policy-open" />
<xi:include href="standard-options.xml" xpointer="no-legend"/>
</variablelist>
</refsect1>

91
src/kernel-install/kernel-install.c
View file

@ -3,10 +3,11 @@
#include <getopt.h>
#include <stdbool.h>
#include "build.h"
#include "boot-entry.h"
#include "build.h"
#include "chase.h"
#include "conf-files.h"
#include "dirent-util.h"
#include "env-file.h"
#include "env-util.h"
#include "exec-util.h"
@ -23,6 +24,7 @@
#include "parse-argument.h"
#include "path-util.h"
#include "pretty-print.h"
#include "recurse-dir.h"
#include "rm-rf.h"
#include "stat-util.h"
#include "string-table.h"
@ -40,6 +42,7 @@ static JsonFormatFlags arg_json_format_flags = JSON_FORMAT_OFF;
static char *arg_root = NULL;
static char *arg_image = NULL;
static ImagePolicy *arg_image_policy = NULL;
static bool arg_legend = true;
STATIC_DESTRUCTOR_REGISTER(arg_esp_path, freep);
STATIC_DESTRUCTOR_REGISTER(arg_xbootldr_path, freep);
@ -1183,6 +1186,68 @@ static int verb_inspect(int argc, char *argv[], void *userdata) {
return table_print_with_pager(t, arg_json_format_flags, arg_pager_flags, /* show_header= */ false);
}
static int verb_list(int argc, char *argv[], void *userdata) {
_cleanup_close_ int fd = -EBADF;
int r;
fd = open("/usr/lib/modules", O_DIRECTORY|O_RDONLY|O_CLOEXEC);
if (fd < 0)
return log_error_errno(fd, "Failed to open /usr/lib/modules/: %m");
_cleanup_free_ DirectoryEntries *de = NULL;
r = readdir_all(fd, RECURSE_DIR_SORT|RECURSE_DIR_IGNORE_DOT, &de);
if (r < 0)
return log_error_errno(r, "Failed to numerate /usr/lib/modules/ contents: %m");
_cleanup_(table_unrefp) Table *table = NULL;
table = table_new("version", "has kernel", "path");
if (!table)
return log_oom();
table_set_ersatz_string(table, TABLE_ERSATZ_DASH);
table_set_align_percent(table, table_get_cell(table, 0, 1), 100);
FOREACH_ARRAY(d, de->entries, de->n_entries) {
_cleanup_free_ char *j = path_join("/usr/lib/modules/", (*d)->d_name);
if (!j)
return log_oom();
r = dirent_ensure_type(fd, *d);
if (r < 0) {
if (r != -ENOENT) /* don't log if just gone by now */
log_debug_errno(r, "Failed to check if '%s' is a directory, ignoring: %m", j);
continue;
}
if ((*d)->d_type != DT_DIR)
continue;
_cleanup_free_ char *fn = path_join((*d)->d_name, "vmlinuz");
if (!fn)
return log_oom();
bool exists;
if (faccessat(fd, fn, F_OK, AT_SYMLINK_NOFOLLOW) < 0) {
if (errno != ENOENT)
log_debug_errno(errno, "Failed to check if '/usr/lib/modules/%s/vmlinuz' exists, ignoring: %m", (*d)->d_name);
exists = false;
} else
exists = true;
r = table_add_many(table,
TABLE_STRING, (*d)->d_name,
TABLE_BOOLEAN_CHECKMARK, exists,
TABLE_SET_COLOR, ansi_highlight_green_red(exists),
TABLE_PATH, j);
if (r < 0)
return table_log_add_error(r);
}
return table_print_with_pager(table, arg_json_format_flags, arg_pager_flags, arg_legend);
}
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
@ -1192,13 +1257,13 @@ static int help(void) {
return log_oom();
printf("%1$s [OPTIONS...] COMMAND ...\n\n"
"%2$sAdd and remove kernel and initrd images to and from /boot%3$s\n"
"\nUsage:\n"
"%5$sAdd and remove kernel and initrd images to and from /boot/%6$s\n"
"\n%3$sUsage:%4$s\n"
" kernel-install [OPTIONS...] add KERNEL-VERSION KERNEL-IMAGE [INITRD ...]\n"
" kernel-install [OPTIONS...] remove KERNEL-VERSION\n"
" kernel-install [OPTIONS...] inspect [KERNEL-VERSION] KERNEL-IMAGE [INITRD ...]\n"
"\n"
"Options:\n"
" kernel-install [OPTIONS...] list\n"
"\n%3$sOptions:%4$s\n"
" -h --help Show this help\n"
" --version Show package version\n"
" -v --verbose Increase verbosity\n"
@ -1210,6 +1275,7 @@ static int help(void) {
" Entry token to use for this installation\n"
" --no-pager Do not pipe inspect output into a pager\n"
" --json=pretty|short|off Generate JSON output\n"
" --no-legend Do not show the headers and footers\n"
" --root=PATH Operate on an alternate filesystem root\n"
" --image=PATH Operate on disk image as filesystem root\n"
" --image-policy=POLICY Specify disk image dissection policy\n"
@ -1218,11 +1284,13 @@ static int help(void) {
" installkernel [OPTIONS...] VERSION VMLINUZ [MAP] [INSTALLATION-DIR]\n"
"(The optional arguments are passed by kernel build system, but ignored.)\n"
"\n"
"See the %4$s for details.\n",
"See the %2$s for details.\n",
program_invocation_short_name,
ansi_highlight(),
link,
ansi_underline(),
ansi_normal(),
link);
ansi_highlight(),
ansi_normal());
return 0;
}
@ -1230,6 +1298,7 @@ static int help(void) {
static int parse_argv(int argc, char *argv[], Context *c) {
enum {
ARG_VERSION = 0x100,
ARG_NO_LEGEND,
ARG_ESP_PATH,
ARG_BOOT_PATH,
ARG_MAKE_ENTRY_DIRECTORY,
@ -1253,6 +1322,7 @@ static int parse_argv(int argc, char *argv[], Context *c) {
{ "root", required_argument, NULL, ARG_ROOT },
{ "image", required_argument, NULL, ARG_IMAGE },
{ "image-policy", required_argument, NULL, ARG_IMAGE_POLICY },
{ "no-legend", no_argument, NULL, ARG_NO_LEGEND },
{}
};
int t, r;
@ -1269,6 +1339,10 @@ static int parse_argv(int argc, char *argv[], Context *c) {
case ARG_VERSION:
return version();
case ARG_NO_LEGEND:
arg_legend = false;
break;
case 'v':
log_set_max_level(LOG_DEBUG);
arg_verbose = true;
@ -1350,6 +1424,7 @@ static int run(int argc, char* argv[]) {
{ "add", 3, VERB_ANY, 0, verb_add },
{ "remove", 2, VERB_ANY, 0, verb_remove },
{ "inspect", 1, VERB_ANY, VERB_DEFAULT, verb_inspect },
{ "list", 1, 1, 0, verb_list },
{}
};
_cleanup_(context_done) Context c = {