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Add a subcommand to citadel-boot to create /boot automount units

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And launch this subcommand from a systemd unit file, and use
systemd-mount to create the automount units instead of writing
them manually.
This commit is contained in:
Bruce Leidl 2020-12-07 17:18:17 -05:00
parent ecca0f5002
commit 3cf87ee1da
2 changed files with 32 additions and 38 deletions
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59
citadel-tool/src/boot/mod.rs
View File

@ -20,6 +20,7 @@ pub fn main(args: Vec<String>) {
let result = match args.get(1) {
Some(s) if s == "rootfs" => do_rootfs(),
Some(s) if s == "setup" => do_setup(),
Some(s) if s == "boot-automount" => do_boot_automount(),
Some(s) if s == "start-realms" => do_start_realms(),
_ => Err(format_err!("Bad or missing argument").into()),
};
@ -30,6 +31,7 @@ pub fn main(args: Vec<String>) {
}
}
fn do_rootfs() -> Result<()> {
if CommandLine::live_mode() || CommandLine::install_mode() {
live::live_rootfs()
@ -59,12 +61,10 @@ fn do_setup() -> Result<()> {
mount_overlay()?;
}
if !(CommandLine::live_mode() || CommandLine::install_mode()) {
write_boot_automount()?;
}
Ok(())
}
fn mount_overlay() -> Result<()> {
info!("Creating rootfs overlay");
@ -94,22 +94,32 @@ fn do_start_realms() -> Result<()> {
manager.start_boot_realms()
}
// Try to determine which partition on the system is the /boot partition and
// generate mount/automount units for it.
fn write_boot_automount() -> Result<()> {
// Write automount unit for /boot partition
fn do_boot_automount() -> Result<()> {
Logger::set_log_level(LogLevel::Info);
if CommandLine::live_mode() || CommandLine::install_mode() {
info!("Skipping creation of /boot automount units for live/install mode");
return Ok(());
}
let boot_partition = find_boot_partition()?;
info!("Creating /boot automount units for boot partition {}", boot_partition);
cmd!("/usr/bin/systemd-mount", "-A --timeout-idle-sec=300 {} /boot", boot_partition)
}
fn find_boot_partition() -> Result<String> {
let loader_dev = read_loader_dev_efi_var()?;
let boot_partitions = DiskPartition::boot_partitions(true)?
.into_iter()
.filter(|part| matches_loader_dev(part, &loader_dev))
.collect::<Vec<_>>();
if boot_partitions.len() == 1 {
write_automount_units(&boot_partitions[0])?;
} else {
warn!("Not writing /boot automount units because cannot uniquely determine boot partition");
if boot_partitions.len() != 1 {
return Err(format_err!("Cannot uniquely determine boot partition"));
}
Ok(())
Ok(boot_partitions[0].path().display().to_string())
}
// if the 'loader device' EFI variable is set, then dev will contain the UUID
@ -146,30 +156,3 @@ fn read_loader_dev_efi_var() -> Result<Option<String>> {
Ok(None)
}
}
pub fn write_automount_units(partition: &DiskPartition) -> Result<()> {
let dev = partition.path().display().to_string();
info!("Writing /boot automount units to /run/systemd/system for {}", dev);
let mount_unit = BOOT_MOUNT_UNIT.replace("$PARTITION", &dev);
util::write_file("/run/systemd/system/boot.mount", &mount_unit)?;
util::write_file("/run/systemd/system/boot.automount", BOOT_AUTOMOUNT_UNIT)?;
info!("Starting /boot automount service");
cmd!("/usr/bin/systemctl", "start boot.automount")?;
Ok(())
}
const BOOT_AUTOMOUNT_UNIT: &str = "\
[Unit]
Description=Automount /boot partition
[Automount]
Where=/boot
TimeoutIdleSec=300
";
const BOOT_MOUNT_UNIT: &str = "\
[Unit]
Description=Mount /boot partition
[Mount]
What=$PARTITION
Where=/boot
";

11
systemd/citadel-boot-automount.service Normal file
View File

@ -0,0 +1,11 @@
[Unit]
Description=Create /boot Automount Units
Before=boot-complete.target
[Service]
Type=oneshot
RemainAfterExit=true
ExecStart=/usr/libexec/citadel-boot boot-automount
[Install]
WantedBy=multi-user.target