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From 752ce62315bb38bd1267bd49dccc4dad2e9d05ee Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Mon, 8 May 2023 19:49:33 +0900
Subject: [PATCH] fstab-generator: support defining mount units through kernel
command line
Now, the following kernel command line options are supported:
systemd.mount-extra=what:where:fstype:options
systemd.swap-extra=what:options
Closes #27260.
(cherry picked from commit 55365b0a233ae3024411fd0815ad930e20f6a3d6)
Resolves: #2190226
---
man/systemd-fstab-generator.xml | 27 +++++
src/fstab-generator/fstab-generator.c | 164 +++++++++++++++++++++++++-
2 files changed, 186 insertions(+), 5 deletions(-)
diff --git a/man/systemd-fstab-generator.xml b/man/systemd-fstab-generator.xml
index 30204f5d8a..b29022fab7 100644
--- a/man/systemd-fstab-generator.xml
+++ b/man/systemd-fstab-generator.xml
@@ -239,6 +239,33 @@
any swap devices configured in <filename>/etc/fstab</filename>.
Defaults to enabled.</para></listitem>
</varlistentry>
+
+ <varlistentry>
+ <term><varname>systemd.mount-extra=<replaceable>WHAT</replaceable>:<replaceable>WHERE</replaceable>[:<replaceable>FSTYPE</replaceable>[:<replaceable>OPTIONS</replaceable>]]</varname></term>
+
+ <listitem>
+ <para>Specifies the mount unit. Takes at least two and at most four fields separated with a colon
+ (<literal>:</literal>). Each field is handled as the corresponding fstab field. This option can be
+ specified multiple times.</para>
+ <para>Example:
+ <programlisting>
+systemd.mount-extra=/dev/sda1:/mount-point:ext4:rw,noatime</programlisting>
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>systemd.swap-extra=<replaceable>WHAT</replaceable>[:<replaceable>OPTIONS</replaceable>]</varname></term>
+
+ <listitem>
+ <para>Specifies the swap unit. Takes the block device to be used as a swap device, and optionally
+ takes mount options followed by a colon (<literal>:</literal>).</para>
+ <para>Example:
+ <programlisting>
+systemd.swap=/dev/sda2:x-systemd.makefs</programlisting>
+ </para>
+ </listitem>
+ </varlistentry>
</variablelist>
</refsect1>
diff --git a/src/fstab-generator/fstab-generator.c b/src/fstab-generator/fstab-generator.c
index c53feb6154..910e29d26b 100644
--- a/src/fstab-generator/fstab-generator.c
+++ b/src/fstab-generator/fstab-generator.c
@@ -20,6 +20,7 @@
#include "mount-setup.h"
#include "mount-util.h"
#include "mountpoint-util.h"
+#include "nulstr-util.h"
#include "parse-util.h"
#include "path-util.h"
#include "proc-cmdline.h"
@@ -43,6 +44,15 @@ typedef enum MountPointFlags {
MOUNT_RW_ONLY = 1 << 5,
} MountPointFlags;
+typedef struct Mount {
+ char *what;
+ char *where;
+ char *fstype;
+ char *options;
+} Mount;
+
+static void mount_array_free(Mount *mounts, size_t n);
+
static bool arg_sysroot_check = false;
static const char *arg_dest = NULL;
static const char *arg_dest_late = NULL;
@@ -58,6 +68,8 @@ static char *arg_usr_fstype = NULL;
static char *arg_usr_options = NULL;
static char *arg_usr_hash = NULL;
static VolatileMode arg_volatile_mode = _VOLATILE_MODE_INVALID;
+static Mount *arg_mounts = NULL;
+static size_t arg_n_mounts = 0;
STATIC_DESTRUCTOR_REGISTER(arg_root_what, freep);
STATIC_DESTRUCTOR_REGISTER(arg_root_fstype, freep);
@@ -67,6 +79,101 @@ STATIC_DESTRUCTOR_REGISTER(arg_usr_what, freep);
STATIC_DESTRUCTOR_REGISTER(arg_usr_fstype, freep);
STATIC_DESTRUCTOR_REGISTER(arg_usr_options, freep);
STATIC_DESTRUCTOR_REGISTER(arg_usr_hash, freep);
+STATIC_ARRAY_DESTRUCTOR_REGISTER(arg_mounts, arg_n_mounts, mount_array_free);
+
+static void mount_done(Mount *m) {
+ assert(m);
+
+ free(m->what);
+ free(m->where);
+ free(m->fstype);
+ free(m->options);
+}
+
+static void mount_array_free(Mount *mounts, size_t n) {
+ FOREACH_ARRAY(m, mounts, n)
+ mount_done(m);
+
+ free(mounts);
+}
+
+static int mount_array_add_internal(char *in_what, char *in_where, const char *in_fstype, const char *in_options) {
+ _cleanup_free_ char *what = NULL, *where = NULL, *fstype = NULL, *options = NULL;
+ int r;
+
+ /* This takes what and where. */
+
+ what = ASSERT_PTR(in_what);
+ where = in_where;
+
+ fstype = strdup(isempty(in_fstype) ? "auto" : in_fstype);
+ if (!fstype)
+ return -ENOMEM;
+
+ if (streq(fstype, "swap"))
+ where = mfree(where);
+
+ if (!isempty(in_options)) {
+ _cleanup_strv_free_ char **options_strv = NULL;
+
+ r = strv_split_full(&options_strv, in_options, ",", 0);
+ if (r < 0)
+ return r;
+
+ r = strv_make_nulstr(options_strv, &options, NULL);
+ } else
+ r = strv_make_nulstr(STRV_MAKE("defaults"), &options, NULL);
+ if (r < 0)
+ return r;
+
+ if (!GREEDY_REALLOC(arg_mounts, arg_n_mounts + 1))
+ return -ENOMEM;
+
+ arg_mounts[arg_n_mounts++] = (Mount) {
+ .what = TAKE_PTR(what),
+ .where = TAKE_PTR(where),
+ .fstype = TAKE_PTR(fstype),
+ .options = TAKE_PTR(options),
+ };
+
+ return 0;
+}
+
+static int mount_array_add(const char *str) {
+ _cleanup_free_ char *what = NULL, *where = NULL, *fstype = NULL, *options = NULL;
+ int r;
+
+ assert(str);
+
+ r = extract_many_words(&str, ":", EXTRACT_CUNESCAPE | EXTRACT_DONT_COALESCE_SEPARATORS,
+ &what, &where, &fstype, &options, NULL);
+ if (r < 0)
+ return r;
+ if (r < 2)
+ return -EINVAL;
+ if (!isempty(str))
+ return -EINVAL;
+
+ return mount_array_add_internal(TAKE_PTR(what), TAKE_PTR(where), fstype, options);
+}
+
+static int mount_array_add_swap(const char *str) {
+ _cleanup_free_ char *what = NULL, *options = NULL;
+ int r;
+
+ assert(str);
+
+ r = extract_many_words(&str, ":", EXTRACT_CUNESCAPE | EXTRACT_DONT_COALESCE_SEPARATORS,
+ &what, &options, NULL);
+ if (r < 0)
+ return r;
+ if (r < 1)
+ return -EINVAL;
+ if (!isempty(str))
+ return -EINVAL;
+
+ return mount_array_add_internal(TAKE_PTR(what), NULL, "swap", options);
+}
static int write_options(FILE *f, const char *options) {
_cleanup_free_ char *o = NULL;
@@ -109,12 +216,12 @@ static int add_swap(
assert(what);
if (access("/proc/swaps", F_OK) < 0) {
- log_info("Swap not supported, ignoring fstab swap entry for %s.", what);
+ log_info("Swap not supported, ignoring swap entry for %s.", what);
return 0;
}
if (detect_container() > 0) {
- log_info("Running in a container, ignoring fstab swap entry for %s.", what);
+ log_info("Running in a container, ignoring swap entry for %s.", what);
return 0;
}
@@ -687,7 +794,8 @@ static int parse_fstab_one(
const char *fstype,
const char *options,
int passno,
- bool initrd) {
+ bool initrd,
+ bool use_swap_enabled) {
_cleanup_free_ char *what = NULL, *where = NULL;
MountPointFlags flags;
@@ -702,7 +810,7 @@ static int parse_fstab_one(
return 0;
is_swap = streq_ptr(fstype, "swap");
- if (is_swap && !arg_swap_enabled) {
+ if (is_swap && use_swap_enabled && !arg_swap_enabled) {
log_info("Swap unit generation disabled on kernel command line, ignoring swap entry for %s.", what);
return 0;
}
@@ -830,7 +938,9 @@ static int parse_fstab(bool initrd) {
}
while ((me = getmntent(f))) {
- r = parse_fstab_one(fstab, me->mnt_fsname, me->mnt_dir, me->mnt_type, me->mnt_opts, me->mnt_passno, initrd);
+ r = parse_fstab_one(fstab,
+ me->mnt_fsname, me->mnt_dir, me->mnt_type, me->mnt_opts, me->mnt_passno,
+ initrd, /* use_swap_enabled = */ true);
if (r < 0 && ret >= 0)
ret = r;
if (arg_sysroot_check && r > 0)
@@ -1129,6 +1239,28 @@ static int add_volatile_var(void) {
SPECIAL_LOCAL_FS_TARGET);
}
+static int add_mounts_from_cmdline(void) {
+ int r, ret = 0;
+
+ /* Handle each entries found in cmdline as a fstab entry. */
+
+ FOREACH_ARRAY(m, arg_mounts, arg_n_mounts) {
+ r = parse_fstab_one(
+ "/proc/cmdline",
+ m->what,
+ m->where,
+ m->fstype,
+ m->options,
+ /* passno = */ 0,
+ /* initrd = */ false,
+ /* use_swap_enabled = */ false);
+ if (r < 0 && ret >= 0)
+ ret = r;
+ }
+
+ return ret;
+}
+
static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
int r;
@@ -1225,6 +1357,24 @@ static int parse_proc_cmdline_item(const char *key, const char *value, void *dat
log_warning("Failed to parse systemd.swap switch %s. Ignoring.", value);
else
arg_swap_enabled = r;
+
+ } else if (streq(key, "systemd.mount-extra")) {
+
+ if (proc_cmdline_value_missing(key, value))
+ return 0;
+
+ r = mount_array_add(value);
+ if (r < 0)
+ log_warning("Failed to parse systemd.mount-extra= option, ignoring: %s", value);
+
+ } else if (streq(key, "systemd.swap-extra")) {
+
+ if (proc_cmdline_value_missing(key, value))
+ return 0;
+
+ r = mount_array_add_swap(value);
+ if (r < 0)
+ log_warning("Failed to parse systemd.swap-extra= option, ignoring: %s", value);
}
return 0;
@@ -1318,6 +1468,10 @@ static int run_generator(void) {
ret = r;
}
+ r = add_mounts_from_cmdline();
+ if (r < 0 && ret >= 0)
+ ret = r;
+
return ret;
}
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