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From a1b1037640e6b01116ad637bbc7abe8612d6e0f4 Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Wed, 26 Jul 2023 04:17:27 +0900
Subject: [PATCH] fstab-generator: add rd.systemd.mount-extra= and friends
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.
(cherry picked from commit 45c535ddb009d89f2740bdf3a5c88594962759fb)
Related: #2190226
---
man/systemd-fstab-generator.xml | 11 +++++--
src/fstab-generator/fstab-generator.c | 31 +++++++++++++------
.../test-19-mounts-from-cmdline.input | 10 +++---
.../test-20-swap-from-cmdline.input | 8 ++---
4 files changed, 39 insertions(+), 21 deletions(-)
diff --git a/man/systemd-fstab-generator.xml b/man/systemd-fstab-generator.xml
index b29022fab7..66289d6be3 100644
--- a/man/systemd-fstab-generator.xml
+++ b/man/systemd-fstab-generator.xml
@@ -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>
diff --git a/src/fstab-generator/fstab-generator.c b/src/fstab-generator/fstab-generator.c
index a7c34cfdf7..f91a863a1d 100644
--- a/src/fstab-generator/fstab-generator.c
+++ b/src/fstab-generator/fstab-generator.c
@@ -45,6 +45,7 @@ typedef enum MountPointFlags {
} MountPointFlags;
typedef struct Mount {
+ bool for_initrd;
char *what;
char *where;
char *fstype;
@@ -97,7 +98,13 @@ 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;
@@ -130,6 +137,7 @@ 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),
@@ -139,7 +147,7 @@ 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;
@@ -154,10 +162,10 @@ 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;
@@ -172,7 +180,7 @@ 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) {
@@ -1267,6 +1275,9 @@ 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,
@@ -1274,7 +1285,7 @@ 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;
@@ -1380,21 +1391,21 @@ static int parse_proc_cmdline_item(const char *key, const char *value, void *dat
else
arg_swap_enabled = 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);
}
diff --git a/test/test-fstab-generator/test-19-mounts-from-cmdline.input b/test/test-fstab-generator/test-19-mounts-from-cmdline.input
index 4312d01e52..f2cc6fc075 100644
--- a/test/test-fstab-generator/test-19-mounts-from-cmdline.input
+++ b/test/test-fstab-generator/test-19-mounts-from-cmdline.input
@@ -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
diff --git a/test/test-fstab-generator/test-20-swap-from-cmdline.input b/test/test-fstab-generator/test-20-swap-from-cmdline.input
index 953c09ff10..d92c5300e2 100644
--- a/test/test-fstab-generator/test-20-swap-from-cmdline.input
+++ b/test/test-fstab-generator/test-20-swap-from-cmdline.input
@@ -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
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