179 lines
7.8 KiB
Bash
179 lines
7.8 KiB
Bash
#!/bin/sh
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#
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# init — Linux guest init script for UTSM dual-kernel Linux compat layer.
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#
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# Boot sequence (phase 2 — Arch rootfs via virtio-blk /dev/vdb):
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# 1. Mount essential filesystems (proc/sys/dev)
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# 2. Wait for /dev/vdb (Arch rootfs virtio-blk device) to appea
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# 3. Mount /dev/vdb as ext4 at /mnt/root
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# 4. Copy /dev nodes + daemon (already baked into rootfs) into /mnt/root
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# 5. switch_root /mnt/root /sbin/init
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# 6. Arch /sbin/init starts utsm_exec_daemon → EXEC_READY → HLT (park)
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# → linux_launch() returns to UTSM
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#
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# Fallback (phase 1 — no rootfs, daemon in initramfs):
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# - If /dev/vdb never appears, start daemon directly from initramfs.
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# - If no daemon either, drop to interactive debug shell on ttyS0.
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#
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# The daemon runs forever, parking between requests. After switch_root,
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# Arch /sbin/init owns PID 1 and must not exit.
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PATH=/bin:/sbin:/usr/bin:/usr/sbin
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export PATH
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# Kernel printk is on ttyS0. Also write to kmsg so lines survive
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# interleaving with guest printk (userspace /dev/console is racy).
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klog() {
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echo "$1"
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echo "$1" >/dev/kmsg 2>/dev/null || true
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}
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# Mount essential filesystems
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mount -t proc none /proc 2>/dev/null
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mount -t sysfs none /sys 2>/dev/null
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mount -t devtmpfs none /dev 2>/dev/null
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klog "[utsm-linux] init started"
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klog "[utsm-linux] kernel: $(uname -r)"
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# Verify /dev/utsm exists (driver is built-in, should be auto-created)
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if [ ! -e /dev/utsm ]; then
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klog "[utsm-linux] WARNING: /dev/utsm not found — UTSM driver not loaded"
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fi
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# ===== Phase 2: switch_root to Arch rootfs on /dev/vdb =====
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# The rootfs is exposed as a memory-backed virtio-blk device (GPA 0xF4002000,
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# IRQ7). Wait up to ~5s for the kernel to discover it via devtmpfs.
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klog "[utsm-linux] waiting for /dev/vdb (Arch rootfs)..."
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VDB_OK=0
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i=0
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while [ $i -lt 50 ]; do
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if [ -b /dev/vdb ]; then
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VDB_OK=1
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break
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fi
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# 100ms sleep (busybox sleep supports fractional seconds)
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sleep 0.1
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i=$((i + 1))
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done
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if [ $VDB_OK -eq 1 ]; then
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klog "[utsm-linux] /dev/vdb found, attempting ext4 mount..."
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mkdir -p /mnt/root
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# Try ext4 (preferred); fall back to ext2 if ext4 module absent.
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if mount -t ext4 -o ro /dev/vdb /mnt/root 2>/dev/null || \
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mount -t ext2 -o ro /dev/vdb /mnt/root 2>/dev/null; then
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klog "[utsm-linux] rootfs mounted, verifying init..."
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# systemd (Arch /sbin/init) SIGSEGV'd in glibc in this VMM
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# (noapic/nosmp/hidden XSAVE). PID 1 must be the exec daemon so
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# the host can still EXEC_REQUEST startplasma from extra-rootfs.
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GUEST_INIT=""
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if [ -x /mnt/root/usr/local/bin/utsm_exec_daemon ]; then
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GUEST_INIT=/usr/local/bin/utsm_exec_daemon
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elif [ -x /mnt/root/sbin/init ]; then
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GUEST_INIT=/sbin/init
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fi
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if [ -n "$GUEST_INIT" ]; then
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klog "[utsm-linux] switch_root → $GUEST_INIT"
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# Mount /dev/vdc BEFORE moving /dev away. After mount --move,
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# initramfs /dev is empty and [ -b /dev/vdc ] is always false.
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j=0
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while [ $j -lt 30 ] && [ ! -b /dev/vdc ]; do
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sleep 0.1
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j=$((j + 1))
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done
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if [ -b /dev/vdc ]; then
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klog "[utsm-linux] /dev/vdc found, mounting persist read-only..."
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# Never remount vdb/vdc rw: virtio writes dirty ext4 and
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# later iget checksums fail (libreadline/grep/mkdir).
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# /mnt exists on the Arch image; tmpfs covers it without rw.
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# Persist looks writable via overlay+tmpfs upper so Xorg can
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# write /etc/X11 and /var/log without touching vdc.
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mkdir -p /mnt/persist
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if [ -d /mnt/root/mnt ]; then
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mount -t tmpfs -o mode=755,size=64m tmpfs /mnt/root/mnt
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fi
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mkdir -p /mnt/root/mnt/persist-ro \
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/mnt/root/mnt/persist \
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/mnt/root/mnt/persist-ov
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if mount -t ext4 -o ro,noload /dev/vdc /mnt/root/mnt/persist-ro || \
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mount -t ext2 -o ro /dev/vdc /mnt/root/mnt/persist-ro; then
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klog "[utsm-linux] /dev/vdc mounted ro at persist-ro"
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mount -t tmpfs -o mode=755,size=512m tmpfs \
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/mnt/root/mnt/persist-ov
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mkdir -p /mnt/root/mnt/persist-ov/upper \
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/mnt/root/mnt/persist-ov/work
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modprobe overlay 2>/dev/null
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if mount -t overlay overlay \
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-o lowerdir=/mnt/root/mnt/persist-ro,upperdir=/mnt/root/mnt/persist-ov/upper,workdir=/mnt/root/mnt/persist-ov/work \
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/mnt/root/mnt/persist; then
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klog "[utsm-linux] persist overlay rw (tmpfs upper, vdc still ro)"
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else
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mount -o bind /mnt/root/mnt/persist-ro \
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/mnt/root/mnt/persist 2>/dev/null || \
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mount --bind /mnt/root/mnt/persist-ro \
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/mnt/root/mnt/persist 2>/dev/null || true
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klog "[utsm-linux] persist overlay failed; bound persist-ro"
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fi
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if ! mount -o bind /mnt/root/mnt/persist /mnt/persist; then
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mount --bind /mnt/root/mnt/persist /mnt/persist 2>/dev/null || true
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fi
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for d in opt home root; do
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mkdir -p /mnt/root/mnt/persist-ov/$d/upper \
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/mnt/root/mnt/persist-ov/$d/work \
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/mnt/root/$d
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if mount -t overlay overlay \
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-o lowerdir=/mnt/root/$d,upperdir=/mnt/root/mnt/persist-ov/$d/upper,workdir=/mnt/root/mnt/persist-ov/$d/work \
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/mnt/root/$d 2>/dev/null; then
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klog "[utsm-linux] overlay: /$d rw (tmpfs)"
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fi
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done
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if [ -x /mnt/root/mnt/persist/usr/bin/startplasma-x11 ]; then
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klog "[utsm-linux] startplasma-x11 present on persist"
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else
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klog "[utsm-linux] WARNING: startplasma-x11 missing on persist"
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fi
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else
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klog "[utsm-linux] WARNING: /dev/vdc mount failed (no persistence)"
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fi
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else
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klog "[utsm-linux] WARNING: /dev/vdc missing"
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fi
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mount --move /dev /mnt/root/dev 2>/dev/null
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mount --move /proc /mnt/root/proc 2>/dev/null
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mount --move /sys /mnt/root/sys 2>/dev/null
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exec switch_root /mnt/root "$GUEST_INIT"
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# switch_root does not return
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else
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klog "[utsm-linux] WARNING: no daemon or /sbin/init on rootfs"
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umount /mnt/root 2>/dev/null
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fi
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else
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klog "[utsm-linux] WARNING: ext4/ext2 mount of /dev/vdb failed"
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klog "[utsm-linux] available block devices:"
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ls -l /dev/vd* /dev/sd* 2>/dev/null
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fi
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else
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klog "[utsm-linux] /dev/vdb not found after 5s — phase-1 fallback"
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fi
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# ===== Fallback: daemon directly from initramfs (phase 1) =====
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if [ -x /bin/utsm_exec_daemon ]; then
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echo "[utsm-linux] starting utsm_exec_daemon from initramfs..."
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/bin/utsm_exec_daemon &
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DAEMON_PID=$!
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echo "[utsm-linux] daemon PID=$DAEMON_PID"
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# init must not exit — sleep forever to keep the kernel happy.
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echo "[utsm-linux] init: daemon running, entering idle hold"
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while true; do
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sleep 3600
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done
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fi
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# ===== Last resort: interactive debug shell on ttyS0 =====
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# No daemon and no rootfs — bring-up smoke test only.
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echo "[utsm-linux] WARNING: no daemon, no rootfs — starting interactive debug shell on ttyS0"
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exec /bin/setsid /bin/cttyhack /bin/sh
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