mirror of
https://github.com/getcompanion-ai/computer-guest.git
synced 2026-04-15 06:04:38 +00:00
47 lines
1.2 KiB
Bash
47 lines
1.2 KiB
Bash
#!/usr/bin/env bash
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set -euo pipefail
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wait_for_primary_interface() {
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local attempt=0
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while [ "$attempt" -lt 100 ]; do
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local iface
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iface="$(find /sys/class/net -mindepth 1 -maxdepth 1 -printf '%f\n' | grep -v '^lo$' | head -n1 || true)"
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if [ -n "$iface" ]; then
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printf '%s\n' "$iface"
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return 0
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fi
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attempt=$((attempt + 1))
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sleep 0.1
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done
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return 1
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}
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u32_to_ipv4() {
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local value="$1"
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printf '%d.%d.%d.%d' \
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$(((value >> 24) & 255)) \
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$(((value >> 16) & 255)) \
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$(((value >> 8) & 255)) \
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$((value & 255))
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}
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primary_iface="$(wait_for_primary_interface)"
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mac="$(cat "/sys/class/net/${primary_iface}/address")"
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IFS=':' read -r mac0 mac1 mac2 mac3 mac4 mac5 <<<"$mac"
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guest_u32=$((((16#${mac2}) << 24) | ((16#${mac3}) << 16) | ((16#${mac4}) << 8) | (16#${mac5})))
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gateway_u32=$((guest_u32 - 1))
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guest_ip="$(u32_to_ipv4 "$guest_u32")"
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gateway_ip="$(u32_to_ipv4 "$gateway_u32")"
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ip link set dev lo up
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ip link set dev "$primary_iface" up
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ip addr replace "${guest_ip}/30" dev "$primary_iface"
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ip route replace default via "$gateway_ip" dev "$primary_iface"
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mkdir -p /etc
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cat >/etc/resolv.conf <<'EOF'
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nameserver 1.1.1.1
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nameserver 8.8.8.8
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EOF
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