#!/usr/bin/bash

set -e

# This CGI script is a caching Arch Linux mirror proxy: it forwards new package
# requests to an actual mirror while caching contents to /var/cache/pacman/pkg.
# Use in pacman.conf with:
# 
# 	Server = https://server/path/to/proxy.cgi/$repo/os/$arch/

[[ $REMOTE_ADDR = 127.0.0.1 ]]

cd /var/cache/pacman/pkg
touch used-by-proxy

MIR=$(awk -F '[$=]' '(!/^#/){print$2;exit}' /etc/pacman.d/mirrorlist)
MIR=${MIR# }
MIR=${MIR%/}

PKG=${PATH_INFO##*/}

if [[ $PATH_INFO = /vesath/* ]]; then
	MIR='https://arch.vesath.org/'
	PATH_INFO=${PATH_INFO#/vesath/os/}
fi

[[ $PKG = *.db* ]] &&
exec curl --silent --include "$MIR$PATH_INFO"

cat <<EOF
Content-Type: application/octet-stream
Connection: close

EOF

[[ -s $PKG ]] &&
exec cat "$PKG"

curl --silent "$MIR$PATH_INFO" |
tee "$PKG.part"

mv "$PKG.part" "$PKG"