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v0.2.0 (#50)

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Co-authored-by: Tasnim Kabir Sadik <tksadik@omukk.dev>

Reviewed-on: wrenn/wrenn#50
This commit is contained in:
Rafeed M. Bhuiyan
2026-05-24 21:10:37 +00:00
parent 4707f16c76
commit 05ddf62399
203 changed files with 15815 additions and 9344 deletions
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27
images/wrenn-init.sh
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@ -1,5 +1,5 @@
#!/bin/sh
# wrenn-init: minimal PID 1 init for Firecracker microVMs.
# wrenn-init: minimal PID 1 init for Cloud Hypervisor microVMs.
# Mounts virtual filesystems, starts chronyd for time sync, then execs tini + envd.
set -e
@ -17,9 +17,17 @@ mkdir -p /sys/fs/cgroup
mount -t cgroup2 cgroup2 /sys/fs/cgroup 2>/dev/null || true
echo "+cpu +memory +io" > /sys/fs/cgroup/cgroup.subtree_control 2>/dev/null || true
# Set hostname and make it resolvable (sudo requires this).
hostname capsule
echo "127.0.0.1 capsule" >> /etc/hosts
# Disable write_zeroes and discard on rootfs — dm-snapshot doesn't support
# these ops, but CH advertises them anyway. Suppress at block queue level.
# sysfs attributes are read-only on some kernels, so failures are expected.
{ echo 0 > /sys/block/vda/queue/write_zeroes_max_bytes; } 2>/dev/null || true
{ echo 0 > /sys/block/vda/queue/discard_max_bytes; } 2>/dev/null || true
# Set hostname and make it resolvable (sudo requires this). Use the kernel knob
# directly so we don't depend on the `hostname` binary, which is absent from
# minimal Arch/Fedora images. Guard so a failure never aborts init under set -e.
echo capsule > /proc/sys/kernel/hostname 2>/dev/null || hostname capsule 2>/dev/null || true
echo "127.0.0.1 capsule" >> /etc/hosts 2>/dev/null || true
# Configure networking if the kernel ip= boot arg did not already set it up.
if ! ip addr show eth0 2>/dev/null | grep -q "169.254.0.21"; then
@ -29,9 +37,14 @@ if ! ip addr show eth0 2>/dev/null | grep -q "169.254.0.21"; then
ip route add default via 169.254.0.22 2>/dev/null || true
fi
# Configure DNS resolver.
echo "nameserver 8.8.8.8" > /etc/resolv.conf
echo "nameserver 8.8.4.4" >> /etc/resolv.conf
# Configure DNS resolver. Drop any existing symlink first — on some distros
# (e.g. Fedora) /etc/resolv.conf is a dangling symlink into systemd-resolved,
# and writing through it would fail and abort init under set -e.
rm -f /etc/resolv.conf 2>/dev/null || true
{
echo "nameserver 8.8.8.8"
echo "nameserver 8.8.4.4"
} > /etc/resolv.conf 2>/dev/null || true
# Set a standard PATH so envd and all child processes can find common binaries.
export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games