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#!/bin/sh
# rt_handle_uploaded_key: A script to publish tarballs to a web directory
#
# This script (its 'put' command) should be the command of a public
# ssh key used by the support user to upload tarballs to a public web
# server.
# To use it, create a SSH key for the support user and add it to some ssh
# user on the server with a command field:
# command="/usr/local/bin/rt_handle_uploaded_key put" ssh-rsa [...]
#
# On the server side, set the script to copy the tarballs to some
# directory on the wer server, and configure it to allow getting files
# from there (but not browse. E.g. the apache configuration snippet:
#
# Alias /k $TARBALLS_DIR
# <Directory $TARBALLS_DIR>
# Options None
# AllowOverride None
# Order allow,deny
# allow from all
# </Directory>
#
# Be sure to also delete old tarballs. E.g. a cron job that runs:
#
# find $TARBALLS_DIR -ctime +3 -exec rm -f '{}' \;
#
# To list all current tarballs, run the command with no extra parameter.
# it will list name, tunnelport, upload time and link URL.
set -e
# Required:
TARGET_DIR="$HOME/ra-tarballs"
# The URL under which tarballs are accessible (for printing it)
BASE_URL="http://updates.xorcom.com/k"
# Emit a random-enough string
rand() {
dd if=/dev/urandom count=16 2>/dev/null | md5sum | cut -c1-8
}
tar_name() {
tar xOzf "$1" basename 2>/dev/null || echo NONAME | tr -d -c 'a-zA-Z0-9_'
}
tar_time() {
LANG=C tar tvzf "$1" port | awk '{print $4,$5}'
}
tar_port() {
tar xOzf "$1" tunnelport 2>/dev/null
}
put_tarball() {
# FIXME: this assumes there will be no collisions
# and no concurrent runs
rand_str=`rand`
tar_name="$rand_str.tgz"
tar_full="$TARGET_DIR/$tar_name"
tar_url="$BASE_URL/$tar_name"
dd of="$tar_full" bs=10k count=1 2>/dev/null
if ! tar tzf "$tar_full" >/dev/null; then
echo >&2 "Failed upload. Deleting."
rm "$tar_full"
fi
name=`tar_name "$tar_full"`
port=`tar_port "$tar_full"`
echo "$port, $name: $tar_url"
}
list() {
for tarball in $TARGET_DIR/*.tgz; do
echo $tarball
port=`tar_port "$tarball"`
name=`tar_name "$tarball"`
base_name="${tarball##*/}"
url="$BASE_URL/$base_name"
time=`tar_time "$tarball"`
printf "$name\t$port\t$time $url\n"
done
}
case "$1" in
put) put_tarball ;;
*) list ;;
esac
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