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From 2739a62abe692e9ca5792fc46f03cd4618a65000 Mon Sep 17 00:00:00 2001
From: Lily Foster <lily@lily.flowers>
Date: Wed, 25 Jan 2023 19:05:08 -0500
Subject: [PATCH] fstab-generator: use correct targets when /sysroot is
specificied in fstab only
(cherry picked from commit dfce61dda7b7b15b910221e5ca1673b371554368)
Related: #2190226
---
man/systemd-fstab-generator.xml | 7 ++-
src/fstab-generator/fstab-generator.c | 63 +++++++++++++++++++++------
2 files changed, 54 insertions(+), 16 deletions(-)
diff --git a/man/systemd-fstab-generator.xml b/man/systemd-fstab-generator.xml
index b7908377a4..30204f5d8a 100644
--- a/man/systemd-fstab-generator.xml
+++ b/man/systemd-fstab-generator.xml
@@ -81,12 +81,15 @@
<listitem><para>Configures the operating system's root filesystem to mount when running in the
initrd. This accepts a device node path (usually <filename>/dev/disk/by-uuid/…</filename> or
- <filename>/dev/disk/by-label/…</filename> or similar), or the special values <literal>gpt-auto</literal>
- and <literal>tmpfs</literal>.</para>
+ <filename>/dev/disk/by-label/…</filename> or similar), or the special values <literal>gpt-auto</literal>,
+ <literal>fstab</literal>, and <literal>tmpfs</literal>.</para>
<para>Use <literal>gpt-auto</literal> to explicitly request automatic root file system discovery via
<citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
+ <para>Use <literal>fstab</literal> to explicitly request automatic root file system discovery via
+ the initrd <filename>/etc/fstab</filename> rather than via kernel command line.</para>
+
<para>Use <literal>tmpfs</literal> in order to mount a <citerefentry
project='man-pages'><refentrytitle>tmpfs</refentrytitle><manvolnum>5</manvolnum></citerefentry> file
system as root file system of the OS. This is useful in combination with
diff --git a/src/fstab-generator/fstab-generator.c b/src/fstab-generator/fstab-generator.c
index e76de45a0f..9bf5f04d1d 100644
--- a/src/fstab-generator/fstab-generator.c
+++ b/src/fstab-generator/fstab-generator.c
@@ -633,6 +633,19 @@ static const char* sysroot_fstab_path(void) {
return getenv("SYSTEMD_SYSROOT_FSTAB") ?: "/sysroot/etc/fstab";
}
+static int add_sysusr_sysroot_usr_bind_mount(const char *source) {
+ return add_mount(source,
+ arg_dest,
+ "/sysusr/usr",
+ "/sysroot/usr",
+ NULL,
+ NULL,
+ "bind",
+ 0,
+ 0,
+ SPECIAL_INITRD_FS_TARGET);
+}
+
static int parse_fstab(bool initrd) {
_cleanup_endmntent_ FILE *f = NULL;
const char *fstab;
@@ -734,7 +747,7 @@ static int parse_fstab(bool initrd) {
if (streq(me->mnt_type, "swap"))
k = add_swap(fstab, what, me, flags);
else {
- bool rw_only, automount;
+ bool rw_only, automount, is_sysroot, is_sysroot_usr;
rw_only = fstab_test_option(me->mnt_opts, "x-systemd.rw-only\0");
automount = fstab_test_option(me->mnt_opts,
@@ -744,21 +757,43 @@ static int parse_fstab(bool initrd) {
flags |= rw_only * MOUNT_RW_ONLY |
automount * MOUNT_AUTOMOUNT;
+ is_sysroot = in_initrd() && path_equal(where, "/sysroot");
+ /* See comment from add_sysroot_usr_mount about the need for extra indirection
+ * in case /usr needs to be mounted in order for the root fs to be synthesized
+ * based on configuration included in /usr/, e.g. systemd-repart. */
+ is_sysroot_usr = in_initrd() && path_equal(where, "/sysroot/usr");
+
const char *target_unit =
initrd ? SPECIAL_INITRD_FS_TARGET :
+ is_sysroot ? SPECIAL_INITRD_ROOT_FS_TARGET :
+ is_sysroot_usr ? SPECIAL_INITRD_USR_FS_TARGET :
mount_is_network(me) ? SPECIAL_REMOTE_FS_TARGET :
SPECIAL_LOCAL_FS_TARGET;
+ if (is_sysroot && is_device_path(what)) {
+ r = generator_write_initrd_root_device_deps(arg_dest, what);
+ if (r < 0)
+ return r;
+ }
+
k = add_mount(fstab,
arg_dest,
what,
- canonical_where ?: where,
- canonical_where ? where: NULL,
+ is_sysroot_usr ? "/sysusr/usr" : canonical_where ?: where,
+ !is_sysroot_usr && canonical_where ? where : NULL,
me->mnt_type,
me->mnt_opts,
me->mnt_passno,
flags,
target_unit);
+
+ if (is_sysroot_usr && k >= 0) {
+ log_debug("Synthesizing fstab entry what=/sysusr/usr where=/sysroot/usr opts=bind");
+
+ r = add_sysusr_sysroot_usr_bind_mount(fstab);
+ if (r != 0)
+ k = r;
+ }
}
if (arg_sysroot_check && k > 0)
@@ -836,6 +871,10 @@ static int add_sysroot_mount(void) {
/* This is handled by gpt-auto-generator */
log_debug("Skipping root directory handling, as gpt-auto was requested.");
return 0;
+ } else if (streq(arg_root_what, "fstab")) {
+ /* This is handled by parse_fstab */
+ log_debug("Using initrd's fstab for /sysroot/ configuration.");
+ return 0;
}
r = sysroot_is_nfsroot();
@@ -951,6 +990,11 @@ static int add_sysroot_usr_mount(void) {
log_debug("Skipping /usr/ directory handling, as gpt-auto was requested.");
return 1; /* systemd-gpt-auto-generator will generate a unit for this, hence report that a
* unit file is being created for the host /usr/ mount. */
+ } else if (streq(arg_usr_what, "fstab")) {
+ /* This is handled by parse_fstab */
+ log_debug("Using initrd's fstab for /sysroot/usr/ configuration.");
+ return 1; /* parse_fstab will generate a unit for this, hence report that a
+ * unit file is being created for the host /usr/ mount. */
}
if (path_equal(arg_usr_what, "/dev/nfs")) {
@@ -992,18 +1036,9 @@ static int add_sysroot_usr_mount(void) {
if (r < 0)
return r;
- log_debug("Synthesizing entry what=/sysusr/usr where=/sysrootr/usr opts=bind");
+ log_debug("Synthesizing entry what=/sysusr/usr where=/sysroot/usr opts=bind");
- r = add_mount("/proc/cmdline",
- arg_dest,
- "/sysusr/usr",
- "/sysroot/usr",
- NULL,
- NULL,
- "bind",
- 0,
- 0,
- SPECIAL_INITRD_FS_TARGET);
+ r = add_sysusr_sysroot_usr_bind_mount("/proc/cmdline");
if (r < 0)
return r;
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