130 lines
4.2 KiB
Bash
130 lines
4.2 KiB
Bash
function hide_output {
|
|
# This function hides the output of a command unless the command fails
|
|
# and returns a non-zero exit code.
|
|
|
|
# Get a temporary file.
|
|
OUTPUT=$(tempfile)
|
|
|
|
# Execute command, redirecting stderr/stdout to the temporary file.
|
|
$@ &> $OUTPUT
|
|
|
|
# If the command failed, show the output that was captured in the temporary file.
|
|
if [ $? != 0 ]; then
|
|
# Something failed.
|
|
echo
|
|
echo FAILED: $@
|
|
echo -----------------------------------------
|
|
cat $OUTPUT
|
|
echo -----------------------------------------
|
|
fi
|
|
|
|
# Remove temporary file.
|
|
rm -f $OUTPUT
|
|
}
|
|
|
|
function apt_install {
|
|
# Report any packages already installed.
|
|
PACKAGES=$@
|
|
TO_INSTALL=""
|
|
ALREADY_INSTALLED=""
|
|
for pkg in $PACKAGES; do
|
|
if dpkg -s $pkg 2>/dev/null | grep "^Status: install ok installed" > /dev/null; then
|
|
if [[ ! -z "$ALREADY_INSTALLED" ]]; then ALREADY_INSTALLED="$ALREADY_INSTALLED, "; fi
|
|
ALREADY_INSTALLED="$ALREADY_INSTALLED$pkg (`dpkg -s $pkg | grep ^Version: | sed -e 's/.*: //'`)"
|
|
else
|
|
TO_INSTALL="$TO_INSTALL""$pkg "
|
|
fi
|
|
done
|
|
|
|
# List the packages already installed.
|
|
if [[ ! -z "$ALREADY_INSTALLED" ]]; then
|
|
echo already installed: $ALREADY_INSTALLED
|
|
fi
|
|
|
|
# List the packages about to be installed.
|
|
if [[ ! -z "$TO_INSTALL" ]]; then
|
|
echo installing $TO_INSTALL...
|
|
fi
|
|
|
|
# 'DEBIAN_FRONTEND=noninteractive' is to prevent dbconfig-common from asking you questions.
|
|
#
|
|
# Although we could pass -qq to apt-get to make output quieter, many packages write to stdout
|
|
# and stderr things that aren't really important. Use our hide_output function to capture
|
|
# all of that and only show it if there is a problem (i.e. if apt_get returns a failure exit status).
|
|
#
|
|
# Also note that we still include the whole original package list in the apt-get command in
|
|
# case it wants to upgrade anything, I guess? Maybe we can remove it. Doesn't normally make
|
|
# a difference.
|
|
DEBIAN_FRONTEND=noninteractive \
|
|
hide_output \
|
|
apt-get -y install $PACKAGES
|
|
}
|
|
|
|
function get_default_hostname {
|
|
# Guess the machine's hostname. It should be a fully qualified
|
|
# domain name suitable for DNS. None of these calls may provide
|
|
# the right value, but it's the best guess we can make.
|
|
set -- $(hostname --fqdn 2>/dev/null ||
|
|
hostname --all-fqdns 2>/dev/null ||
|
|
hostname 2>/dev/null)
|
|
printf '%s\n' "$1" # return this value
|
|
}
|
|
|
|
function get_publicip_from_web_service {
|
|
# This seems to be the most reliable way to determine the
|
|
# machine's public IP address: asking a very nice web API
|
|
# for how they see us. Thanks go out to icanhazip.com.
|
|
# See: https://major.io/icanhazip-com-faq/
|
|
#
|
|
# Pass '4' or '6' as an argument to this function to specify
|
|
# what type of address to get (IPv4, IPv6).
|
|
curl -$1 --fail --silent --max-time 15 icanhazip.com 2>/dev/null
|
|
}
|
|
|
|
function get_default_privateip {
|
|
# Return the IP address of the network interface connected
|
|
# to the Internet.
|
|
#
|
|
# We used to use `hostname -I` and then filter for either
|
|
# IPv4 or IPv6 addresses. However if there are multiple
|
|
# network interfaces on the machine, not all may be for
|
|
# reaching the Internet.
|
|
#
|
|
# Instead use `ip route get` which asks the kernel to use
|
|
# the system's routes to select which interface would be
|
|
# used to reach a public address. We'll use 8.8.8.8 as
|
|
# the destination. It happens to be Google Public DNS, but
|
|
# no connection is made. We're just seeing how the box
|
|
# would connect to it. There many be multiple IP addresses
|
|
# assigned to an interface. `ip route get` reports the
|
|
# preferred. That's good enough for us. See issue #121.
|
|
#
|
|
# Also see ae67409603c49b7fa73c227449264ddd10aae6a9 and
|
|
# issue #3 for why/how we originally added IPv6.
|
|
#
|
|
# Pass '4' or '6' as an argument to this function to specify
|
|
# what type of address to get (IPv4, IPv6).
|
|
|
|
target=8.8.8.8
|
|
|
|
# For the IPv6 route, use the corresponding IPv6 address
|
|
# of Google Public DNS. Again, it doesn't matter so long
|
|
# as it's an address on the public Internet.
|
|
if [ "$1" == "6" ]; then target=2001:4860:4860::8888; fi
|
|
|
|
ip -$1 -o route get $target \
|
|
| grep -v unreachable \
|
|
| sed "s/.* src \([^ ]*\).*/\1/"
|
|
}
|
|
|
|
function ufw_allow {
|
|
if [ -z "$DISABLE_FIREWALL" ]; then
|
|
# ufw has completely unhelpful output
|
|
ufw allow $1 > /dev/null;
|
|
fi
|
|
}
|
|
|
|
function restart_service {
|
|
hide_output service $1 restart
|
|
}
|