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fstab-generator: add rd.systemd.mount-extra= and friends

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Previously, mounts specified in systemd.mount-extra= are equally handled
both in initrd and the main system. So, the mounts for the main system
are also mounted in initrd.

This introduces rd.systemd.mount-extra=, which specifies mounts in initrd.
Then, mounts specified in systemd.mount-extra= are still mounted both in
initrd and the main system, but prefixed with /sysroot/ when running in
initrd.

Fixes #28516.
This commit is contained in:
Yu Watanabe 2023-07-26 04:17:27 +09:00
parent b93d9e06fc
commit 45c535ddb0
4 changed files with 39 additions and 21 deletions
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11
man/systemd-fstab-generator.xml
View File

@ -242,11 +242,15 @@
<varlistentry>
<term><varname>systemd.mount-extra=<replaceable>WHAT</replaceable>:<replaceable>WHERE</replaceable>[:<replaceable>FSTYPE</replaceable>[:<replaceable>OPTIONS</replaceable>]]</varname></term>
<term><varname>rd.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>
specified multiple times. <varname>rd.systemd.mount-extra=</varname> is honored only in the initrd,
while <varname>systemd.mount-extra=</varname> is honored by both the main system and the initrd.
In the initrd, the mount point (and also source path if the mount is bind mount) specified in
<varname>systemd.mount-extra=</varname> is prefixed with <filename>/sysroot/</filename>.</para>
<para>Example:
<programlisting>
systemd.mount-extra=/dev/sda1:/mount-point:ext4:rw,noatime</programlisting>
@ -256,10 +260,13 @@ systemd.mount-extra=/dev/sda1:/mount-point:ext4:rw,noatime</programlisting>
<varlistentry>
<term><varname>systemd.swap-extra=<replaceable>WHAT</replaceable>[:<replaceable>OPTIONS</replaceable>]</varname></term>
<term><varname>rd.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>
takes mount options followed by a colon (<literal>:</literal>). This option can be specified
multiple times. <varname>rd.systemd.swap-extra=</varname> is honored only in the initrd, while
<varname>systemd.swap-extra=</varname> is honored by both the main system and the initrd.</para>
<para>Example:
<programlisting>
systemd.swap=/dev/sda2:x-systemd.makefs</programlisting>

31
src/fstab-generator/fstab-generator.c
View File

@ -49,6 +49,7 @@ typedef enum MountPointFlags {
} MountPointFlags;
typedef struct Mount {
bool for_initrd;
char *what;
char *where;
char *fstype;
@ -102,7 +103,13 @@ static void mount_array_free(Mount *mounts, size_t n) {
free(mounts);
}
static int mount_array_add_internal(char *in_what, char *in_where, const char *in_fstype, const char *in_options) {
static int mount_array_add_internal(
bool for_initrd,
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;
@ -135,6 +142,7 @@ static int mount_array_add_internal(char *in_what, char *in_where, const char *i
return -ENOMEM;
arg_mounts[arg_n_mounts++] = (Mount) {
.for_initrd = for_initrd,
.what = TAKE_PTR(what),
.where = TAKE_PTR(where),
.fstype = TAKE_PTR(fstype),
@ -144,7 +152,7 @@ static int mount_array_add_internal(char *in_what, char *in_where, const char *i
return 0;
}
static int mount_array_add(const char *str) {
static int mount_array_add(bool for_initrd, const char *str) {
_cleanup_free_ char *what = NULL, *where = NULL, *fstype = NULL, *options = NULL;
int r;
@ -159,10 +167,10 @@ static int mount_array_add(const char *str) {
if (!isempty(str))
return -EINVAL;
return mount_array_add_internal(TAKE_PTR(what), TAKE_PTR(where), fstype, options);
return mount_array_add_internal(for_initrd, TAKE_PTR(what), TAKE_PTR(where), fstype, options);
}
static int mount_array_add_swap(const char *str) {
static int mount_array_add_swap(bool for_initrd, const char *str) {
_cleanup_free_ char *what = NULL, *options = NULL;
int r;
@ -177,7 +185,7 @@ static int mount_array_add_swap(const char *str) {
if (!isempty(str))
return -EINVAL;
return mount_array_add_internal(TAKE_PTR(what), NULL, "swap", options);
return mount_array_add_internal(for_initrd, TAKE_PTR(what), NULL, "swap", options);
}
static int write_options(FILE *f, const char *options) {
@ -1282,6 +1290,9 @@ static int add_mounts_from_cmdline(void) {
/* Handle each entries found in cmdline as a fstab entry. */
FOREACH_ARRAY(m, arg_mounts, arg_n_mounts) {
if (m->for_initrd && !in_initrd())
continue;
r = parse_fstab_one(
"/proc/cmdline",
m->what,
@ -1289,7 +1300,7 @@ static int add_mounts_from_cmdline(void) {
m->fstype,
m->options,
/* passno = */ 0,
/* prefix_sysroot = */ false,
/* prefix_sysroot = */ !m->for_initrd && in_initrd(),
/* use_swap_enabled = */ false);
if (r < 0 && ret >= 0)
ret = r;
@ -1437,21 +1448,21 @@ static int parse_proc_cmdline_item(const char *key, const char *value, void *dat
else
arg_verity = r;
} else if (streq(key, "systemd.mount-extra")) {
} else if (STR_IN_SET(key, "systemd.mount-extra", "rd.systemd.mount-extra")) {
if (proc_cmdline_value_missing(key, value))
return 0;
r = mount_array_add(value);
r = mount_array_add(startswith(key, "rd."), value);
if (r < 0)
log_warning("Failed to parse systemd.mount-extra= option, ignoring: %s", value);
} else if (streq(key, "systemd.swap-extra")) {
} else if (STR_IN_SET(key, "systemd.swap-extra", "rd.systemd.swap-extra")) {
if (proc_cmdline_value_missing(key, value))
return 0;
r = mount_array_add_swap(value);
r = mount_array_add_swap(startswith(key, "rd."), value);
if (r < 0)
log_warning("Failed to parse systemd.swap-extra= option, ignoring: %s", value);
}

10
test/test-fstab-generator/test-19-mounts-from-cmdline.input
View File

@ -1,5 +1,5 @@
systemd.mount-extra=/dev/sdx1:/sysroot:auto:defaults
systemd.mount-extra=/dev/sdx2:/hoge/without_options:auto
systemd.mount-extra=/dev/sdx3:/hoge/without_fstype
systemd.mount-extra=/dev/sdx4
systemd.mount-extra=//foo\ufffebar:/hoge/with\x20space:cifs:rw,seclabel
rd.systemd.mount-extra=/dev/sdx1:/sysroot:auto:defaults
rd.systemd.mount-extra=/dev/sdx2:/hoge/without_options:auto
rd.systemd.mount-extra=/dev/sdx3:/hoge/without_fstype
rd.systemd.mount-extra=/dev/sdx4
rd.systemd.mount-extra=//foo\ufffebar:/hoge/with\x20space:cifs:rw,seclabel

8
test/test-fstab-generator/test-20-swap-from-cmdline.input
View File

@ -1,4 +1,4 @@
systemd.mount-extra=/dev/sdy1:none:swap
systemd.mount-extra=/dev/sdy2:none:swap:x-systemd.makefs
systemd.swap-extra=/dev/sdy3:x-systemd.makefs,nofail
systemd.swap-extra=/dev/sdy4
rd.systemd.mount-extra=/dev/sdy1:none:swap
rd.systemd.mount-extra=/dev/sdy2:none:swap:x-systemd.makefs
rd.systemd.swap-extra=/dev/sdy3:x-systemd.makefs,nofail
rd.systemd.swap-extra=/dev/sdy4