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From 9f103625b145a397e67c3714766775b615c8b587 Mon Sep 17 00:00:00 2001
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From: Tobias Hunger <tobias.hunger@gmail.com>
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Date: Thu, 9 Oct 2014 21:37:17 +0200
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Subject: [PATCH] fstab-generator: Honor mount.usr*= on kernel command line
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This allows to configure boot loader entries for systems where the
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root and usr filesystems are in different subvolumes (or even on
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different drives).
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---
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man/systemd-fstab-generator.xml | 76 ++++++++++++++++++++++++++++-
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src/fstab-generator/fstab-generator.c | 90 +++++++++++++++++++++++++++++++++--
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2 files changed, 160 insertions(+), 6 deletions(-)
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diff --git a/man/systemd-fstab-generator.xml b/man/systemd-fstab-generator.xml
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index e3cf5d2bfb..65b48eea07 100644
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--- a/man/systemd-fstab-generator.xml
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+++ b/man/systemd-fstab-generator.xml
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@@ -104,9 +104,83 @@
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(initrd) while
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<varname>fstab=</varname> is
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honored by both the main system and
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- the initrd. </para></listitem>
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+ the initrd.</para></listitem>
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</varlistentry>
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+ <varlistentry>
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+ <term><varname>root=</varname></term>
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+
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+ <listitem><para>Takes the root filesystem to mount
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+ in the initrd.
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+ <varname>root=</varname> is
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+ honored by the initrd.</para></listitem>
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+ </varlistentry>
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+ <varlistentry>
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+ <term><varname>rootfstype=</varname></term>
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+
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+ <listitem><para>Takes the root filesystem type that
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+ will be passed to the mount command.
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+ <varname>rootfstype=</varname> is
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+ honored by the initrd.</para></listitem>
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+ </varlistentry>
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+ <varlistentry>
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+ <term><varname>rootflags=</varname></term>
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+
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+ <listitem><para>Takes the root filesystem mount options
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+ to use. <varname>rootflags=</varname> is
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+ honored by the initrd.</para></listitem>
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+ </varlistentry>
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+ <varlistentry>
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+ <term><varname>mount.usr=</varname></term>
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+
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+ <listitem><para>Takes the <filename>/usr</filename>
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+ filesystem to be mounted by the initrd. If
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+ <varname>mount.usrfstype=</varname> or
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+ <varname>mount.usrflags=</varname> is set, then
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+ <varname>mount.usr=</varname> will default to the value set in
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+ <varname>root=</varname>.</para>
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+
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+ <para>Otherwise this parameter defaults to the
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+ <filename>/usr</filename> entry
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+ found in <filename>/etc/fstab</filename> on the root
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+ filesystem.</para>
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+
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+ <para><varname>mount.usr=</varname> is honored by the initrd.
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+ </para></listitem>
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+ </varlistentry>
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+ <varlistentry>
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+ <term><varname>mount.usrfstype=</varname></term>
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+
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+ <listitem><para>Takes the <filename>/usr</filename>
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+ filesystem type that will be passed to the mount
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+ command. If <varname>mount.usr=</varname> or
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+ <varname>mount.usrflags=</varname> is set, then
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+ <varname>mount.usrfstype=</varname> will default to the value set in
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+ <varname>rootfstype=</varname>.</para>
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+
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+ <para>Otherwise this value will be read from the
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+ <filename>/usr</filename> entry in
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+ <filename>/etc/fstab</filename> on the root filesystem.</para>
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+
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+ <para><varname>mount.usrfstype=</varname> is
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+ honored by the initrd.</para></listitem>
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+ </varlistentry>
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+ <varlistentry>
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+ <term><varname>mount.usrflags=</varname></term>
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+
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+ <listitem><para>Takes the <filename>/usr</filename>
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+ filesystem mount options to use. If
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+ <varname>mount.usr=</varname> or
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+ <varname>mount.usrfstype=</varname> is set, then
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+ <varname>mount.usrflages=</varname> will default to the value set in
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+ <varname>rootflags=</varname>.</para>
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+ <para>Otherwise this value will be read from the
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+ <filename>/usr</filename> entry in
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+ <filename>/etc/fstab</filename> on the root filesystem.</para>
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+
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+ <para><varname>mount.usrflags=</varname> is
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+ honored by the initrd.</para></listitem>
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+ </varlistentry>
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</variablelist>
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</refsect1>
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diff --git a/src/fstab-generator/fstab-generator.c b/src/fstab-generator/fstab-generator.c
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index b75bbb7998..32a8f9bd51 100644
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--- a/src/fstab-generator/fstab-generator.c
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+++ b/src/fstab-generator/fstab-generator.c
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@@ -43,6 +43,9 @@ static char *arg_root_what = NULL;
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static char *arg_root_fstype = NULL;
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static char *arg_root_options = NULL;
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static int arg_root_rw = -1;
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+static char *arg_usr_what = NULL;
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+static char *arg_usr_fstype = NULL;
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+static char *arg_usr_options = NULL;
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static int mount_find_pri(struct mntent *me, int *ret) {
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@@ -494,12 +497,64 @@ static int add_root_mount(void) {
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"/proc/cmdline");
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}
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+static int add_usr_mount(void) {
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+ _cleanup_free_ char *what = NULL;
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+ const char *opts;
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+
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+ if (!arg_usr_what && !arg_usr_fstype && !arg_usr_options)
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+ return 0;
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+
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+ if (arg_root_what && !arg_usr_what) {
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+ arg_usr_what = strdup(arg_root_what);
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+
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+ if (!arg_usr_what)
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+ return log_oom();
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+ }
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+
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+ if (arg_root_fstype && !arg_usr_fstype) {
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+ arg_usr_fstype = strdup(arg_root_fstype);
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+
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+ if (!arg_usr_fstype)
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+ return log_oom();
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+ }
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+
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+ if (arg_root_options && !arg_usr_options) {
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+ arg_usr_options = strdup(arg_root_options);
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+
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+ if (!arg_usr_options)
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+ return log_oom();
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+ }
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+
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+ if (!arg_usr_what || !arg_usr_options)
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+ return 0;
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+
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+ what = fstab_node_to_udev_node(arg_usr_what);
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+ if (!path_is_absolute(what)) {
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+ log_debug("Skipping entry what=%s where=/sysroot/usr type=%s", what, strna(arg_usr_fstype));
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+ return -1;
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+ }
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+
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+ opts = arg_usr_options;
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+
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+ log_debug("Found entry what=%s where=/sysroot/usr type=%s", what, strna(arg_usr_fstype));
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+ return add_mount(what,
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+ "/sysroot/usr",
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+ arg_usr_fstype,
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+ opts,
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+ 1,
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+ false,
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+ false,
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+ false,
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+ SPECIAL_INITRD_ROOT_FS_TARGET,
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+ "/proc/cmdline");
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+}
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+
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static int parse_proc_cmdline_item(const char *key, const char *value) {
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int r;
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- /* root= and roofstype= may occur more than once, the last
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- * instance should take precedence. In the case of multiple
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- * rootflags= the arguments should be concatenated */
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+ /* root=, usr=, usrfstype= and roofstype= may occur more than once, the last
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+ * instance should take precedence. In the case of multiple rootflags=
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+ * or usrflags= the arguments should be concatenated */
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if (STR_IN_SET(key, "fstab", "rd.fstab") && value) {
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@@ -531,6 +586,28 @@ static int parse_proc_cmdline_item(const char *key, const char *value) {
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free(arg_root_options);
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arg_root_options = o;
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+ } else if (streq(key, "mount.usr") && value) {
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+
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+ if (free_and_strdup(&arg_usr_what, value) < 0)
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+ return log_oom();
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+
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+ } else if (streq(key, "mount.usrfstype") && value) {
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+
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+ if (free_and_strdup(&arg_usr_fstype, value) < 0)
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+ return log_oom();
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+
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+ } else if (streq(key, "mount.usrflags") && value) {
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+ char *o;
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+
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+ o = arg_usr_options ?
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+ strjoin(arg_usr_options, ",", value, NULL) :
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+ strdup(value);
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+ if (!o)
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+ return log_oom();
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+
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+ free(arg_usr_options);
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+ arg_usr_options = o;
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+
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} else if (streq(key, "rw") && !value)
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arg_root_rw = true;
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else if (streq(key, "ro") && !value)
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@@ -559,9 +636,12 @@ int main(int argc, char *argv[]) {
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if (parse_proc_cmdline(parse_proc_cmdline_item) < 0)
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return EXIT_FAILURE;
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- /* Always honour root= in the kernel command line if we are in an initrd */
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- if (in_initrd())
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+ /* Always honour root= and usr= in the kernel command line if we are in an initrd */
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+ if (in_initrd()) {
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r = add_root_mount();
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+ if (r == 0)
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+ r = add_usr_mount();
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+ }
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/* Honour /etc/fstab only when that's enabled */
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if (arg_fstab_enabled) {
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