87 lines
2.4 KiB
Bash
87 lines
2.4 KiB
Bash
#!/bin/sh
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set -ex
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# provided by nix
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init="@init@"
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kernelParams="@kernelParams@"
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SCRIPT_DIR=$(dirname "$(readlink -f "$0")")
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INITRD_TMP=$(TMPDIR=$SCRIPT_DIR mktemp -d)
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cd "$INITRD_TMP"
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cleanup() {
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rm -rf "$INITRD_TMP"
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}
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trap cleanup EXIT
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mkdir -p ssh
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extractPubKeys() {
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home="$1"
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for file in .ssh/authorized_keys .ssh/authorized_keys2; do
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key="$home/$file"
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if test -e "$key"; then
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# workaround for debian shenanigans
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grep -o '\(\(ssh\|ecdsa\|sk\)-[^ ]* .*\)' "$key" >> ssh/authorized_keys || true
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fi
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done
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}
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extractPubKeys /root
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if test -n "${DOAS_USER-}"; then
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SUDO_USER="$DOAS_USER"
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fi
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if test -n "${SUDO_USER-}"; then
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sudo_home=$(sh -c "echo ~$SUDO_USER")
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extractPubKeys "$sudo_home"
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fi
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# Typically for NixOS
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if test -e /etc/ssh/authorized_keys.d/root; then
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cat /etc/ssh/authorized_keys.d/root >> ssh/authorized_keys
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fi
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if test -n "${SUDO_USER-}" && test -e "/etc/ssh/authorized_keys.d/$SUDO_USER"; then
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cat "/etc/ssh/authorized_keys.d/$SUDO_USER" >> ssh/authorized_keys
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fi
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for p in /etc/ssh/ssh_host_*; do
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test -e "$p" || continue
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cp -a "$p" ssh
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done
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# save the networking config for later use
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"$SCRIPT_DIR/ip" --json addr > addrs.json
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"$SCRIPT_DIR/ip" -4 --json route > routes-v4.json
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"$SCRIPT_DIR/ip" -6 --json route > routes-v6.json
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[ -f /etc/machine-id ] && cp /etc/machine-id machine-id
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find . | cpio -o -H newc | gzip -9 >> "$SCRIPT_DIR/initrd"
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kexecSyscallFlags=""
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# only do kexec-syscall-auto on kernels newer than 6.0.
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# On older kernel we often get errors like: https://github.com/nix-community/nixos-anywhere/issues/264
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if printf "%s\n" "6.1" "$(uname -r)" | sort -c -V 2>&1; then
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kexecSyscallFlags="--kexec-syscall-auto"
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fi
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if ! "$SCRIPT_DIR/kexec" --load "$SCRIPT_DIR/bzImage" \
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"$kexecSyscallFlags" \
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--initrd="$SCRIPT_DIR/initrd" --no-checks \
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--command-line "init=$init $kernelParams"; then
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echo "kexec failed, dumping dmesg"
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dmesg | tail -n 100
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exit 1
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fi
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# Disconnect our background kexec from the terminal
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echo "machine will boot into nixos in 6s..."
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if test -e /dev/kmsg; then
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# this makes logging visible in `dmesg`, or the system console or tools like journald
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exec > /dev/kmsg 2>&1
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else
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exec > /dev/null 2>&1
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fi
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# We will kexec in background so we can cleanly finish the script before the hosts go down.
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# This makes integration with tools like terraform easier.
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nohup sh -c "sleep 6 && '$SCRIPT_DIR/kexec' -e" &
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