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|
#!/bin/sh
set -e
tmpfile=$(mktemp)
cleanup() {
rm -f "$tmpfile"
}
trap cleanup INT EXIT TERM
hit() {
/usr/lib/apt/apt-helper \
-o Acquire::http::Proxy=DIRECT \
download-file "$@" "$tmpfile" 2>&1
}
detect_apt_cacher() {
local ip="$1"
local proxy=http://$ip:3142
hit -o "Acquire::http::Proxy::${ip}=DIRECT" "$proxy" >/dev/null 2>&1 || true;
if [ -s "$tmpfile" ] && grep -q -i '<title>Apt-cacher' "$tmpfile"; then
echo "$proxy"
return 0
fi
return 1
}
detect_apt_cacher_ng() {
local ip="$1"
local proxy=http://$ip:3142
if hit -o "Acquire::http::Proxy::${ip}=DIRECT" "$proxy" | grep -q -i '406.*usage.information'; then
echo "$proxy"
return 0
fi
return 1
}
detect_approx() {
local ip="$1"
local proxy=http://$ip:9999
hit -o "Acquire::http::Proxy::${ip}=DIRECT" "$proxy" >/dev/null 2>&1 || true;
if [ -s "$tmpfile" ] && grep -q -i '<title>approx\s*server</title>' "$tmpfile"; then
echo "$proxy"
return 0
fi
return 1
}
detect() {
if command -v ip >/dev/null; then
gateway=$(ip route | awk '/default/ { print($3) }')
else
gateway=''
fi
for ip in 127.0.0.1 $gateway; do
detect_apt_cacher_ng "$ip" && return 0
detect_approx "$ip" && return 0
detect_apt_cacher "$ip" && return 0
done
return 0
}
if [ $# -eq 0 ]; then
detect
else
case "$1" in
ftp://*|http://*|https://*|file://*)
# APT mode: first argument is an URI
detect
;;
*)
# wrapper mode: execute command using the detected proxy
proxy=$(detect || true)
if [ -n "$proxy" ]; then
export http_proxy="$proxy"
export HTTP_PROXY="$proxy"
fi
exec "$@"
esac
fi
|
