forked from wrenn/wrenn
pptx704
36782e1b4f
- Use tini as PID 1 in wrenn-init.sh so zombie processes are reaped and signals are forwarded correctly to envd - Set standard PATH in wrenn-init.sh so child processes spawned by envd can find common binaries (fixes "nice: ls command not found") - Add envdclient.Init() to POST /init on envd after every boot/resume, syncing the guest clock via unix.ClockSettime — critical after snapshot resume where the guest clock is frozen - Run Init in a background goroutine so it doesn't block the CreateSandbox RPC response; a slow Init (vCPU busy with envd startup) was causing the RPC context to be canceled before the response reached the control plane - Update rootfs-from-container.sh and update-debug-rootfs.sh to inject tini into the rootfs, checking the container image and host first, downloading from GitHub releases as fallback
31 lines
1.0 KiB
Bash
31 lines
1.0 KiB
Bash
#!/bin/sh
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# wrenn-init: minimal PID 1 init for Firecracker microVMs.
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# Mounts virtual filesystems then execs envd.
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set -e
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# Mount essential virtual filesystems if not already mounted.
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mount -t proc proc /proc 2>/dev/null || true
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mount -t sysfs sysfs /sys 2>/dev/null || true
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mount -t devtmpfs devtmpfs /dev 2>/dev/null || true
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mkdir -p /dev/pts /dev/shm
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mount -t devpts devpts /dev/pts 2>/dev/null || true
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mount -t tmpfs tmpfs /dev/shm 2>/dev/null || true
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mount -t tmpfs tmpfs /tmp 2>/dev/null || true
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mount -t tmpfs tmpfs /run 2>/dev/null || true
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mkdir -p /sys/fs/cgroup
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mount -t cgroup2 cgroup2 /sys/fs/cgroup 2>/dev/null || true
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# Set hostname
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hostname sandbox
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# Configure DNS resolver.
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echo "nameserver 8.8.8.8" > /etc/resolv.conf
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echo "nameserver 8.8.4.4" >> /etc/resolv.conf
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# Set a standard PATH so envd and all child processes can find common binaries.
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export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
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# Exec tini as PID 1 — it reaps zombie processes and forwards signals to envd.
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exec /sbin/tini -- /usr/local/bin/envd
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