Add First Boot Time Synchronization

[mihai-chiorean]

Description

Add time synchronization service that runs on first boot to ensure accurate system time.

Problem

Raspberry Pi doesn't have RTC, so time is wrong on first boot until NTP sync occurs.

Implementation

1. Systemd Service

# first-boot-timesync.service
[Unit]
Description=First Boot Time Sync
After=network-online.target
Wants=network-online.target
ConditionFirstBoot=yes

[Service]
Type=oneshot
ExecStart=/usr/bin/timedatectl set-ntp true
ExecStart=/usr/bin/systemctl restart systemd-timesyncd
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target

2. NTP Configuration

# /etc/systemd/timesyncd.conf
[Time]
NTP=time.google.com time.cloudflare.com
FallbackNTP=0.pool.ntp.org 1.pool.ntp.org

3. Recipe

# time-sync.bb
SUMMARY = "First boot time synchronization"
LICENSE = "MIT"

SRC_URI = " \
    file://first-boot-timesync.service \
    file://timesyncd.conf \
    "

inherit systemd

do_install() {
    install -d ${D}${systemd_unitdir}/system
    install -m 0644 ${WORKDIR}/first-boot-timesync.service \
        ${D}${systemd_unitdir}/system/
    
    install -d ${D}${sysconfdir}/systemd
    install -m 0644 ${WORKDIR}/timesyncd.conf \
        ${D}${sysconfdir}/systemd/
}

SYSTEMD_SERVICE:${PN} = "first-boot-timesync.service"
SYSTEMD_AUTO_ENABLE:${PN} = "enable"

Acceptance Criteria

• Time syncs automatically on first boot
• Uses reliable NTP servers
• Falls back to pool.ntp.org if primary fails
• Only runs on first boot (ConditionFirstBoot)
• Logs sync status for debugging
• Works without manual intervention