nixcfg/sshtool

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#!/usr/bin/env bash
CMDFILE="$1"
if [ -z "$CMDFILE" ] || [ ! -f "$CMDFILE" ]; then
echo "sshtool is not meant to be called on its own."
echo "See scripts that use it (e.g. deploy_nixos) for usage examples."
exit 1
fi
shift 1
cd $(dirname $CMDFILE)
CMDFILE=./$(basename $CMDFILE)
CLUSTER="$1"
if [ -z "$CLUSTER" ] || [ ! -d "cluster/$CLUSTER" ]; then
echo "Usage: $CMDFILE <cluster name>"
echo "The cluster name must be the name of a subdirectory of cluster/"
exit 1
fi
shift 1
if [ -z "$1" ]; then
NIXHOSTLIST=$(ls cluster/$CLUSTER/node | grep '\.nix$' | grep -v '\.site\.')
else
NIXHOSTLIST="$@"
fi
if [ -z "$ROOT_PASS" ]; then
read -s -p "Enter remote sudo password: " ROOT_PASS
echo
fi
SSH_CONFIG=cluster/$CLUSTER/ssh_config
function header {
RANDNAME=$(openssl rand -hex 12)
cat <<EOF
cat > /tmp/deploytool_askpass_$RANDNAME <<EOG
#!/usr/bin/env sh
echo "\\\$DEPLOYTOOL_ROOT_PASSWORD"
EOG
chmod +x /tmp/deploytool_askpass_$RANDNAME
export SUDO_ASKPASS=/tmp/deploytool_askpass_$RANDNAME
export DEPLOYTOOL_ROOT_PASSWORD="$ROOT_PASS"
sudo -A sh - <<'EOEVERYTHING'
set -e
EOF
}
function footer {
echo rm -v '/tmp/deploytool_askpass*'
echo EOEVERYTHING
}
function message {
echo "base64 -d <<EOG"
echo "$@" | base64
echo "EOG"
}
function cmd {
echo "echo '- run $@'"
echo "$@"
}
function set_env {
echo "echo '- set $@'"
echo "export $@"
}
function copy {
local FROM=$1
local TO=$2
cat <<EOF
echo '- write $TO from $FROM'
base64 -d <<EOG | tee $TO > /dev/null
$(base64 <$FROM)
EOG
EOF
}
function copy_secret {
local FROM=$1
local TO=$2
cat <<EOF
echo '- write secret $TO from $FROM'
base64 -d <<EOG | tee $TO > /dev/null
$(base64 <$FROM)
EOG
chown root:root $TO
chmod 0600 $TO
EOF
}
function write_pass {
local PASSKEY=$1
local TO=$2
cat <<EOF
echo '- write secret $TO from pass $PASSKEY'
base64 -d <<EOG | tee $TO > /dev/null
$(pass $PASSKEY | base64)
EOG
chown root:root $TO
chmod 0600 $TO
EOF
}
function pipe_pass {
local PASSKEY=$1
local CMD=$2
cat <<EOF
echo '- pipe secret $PASSKEY to command $CMD'
base64 -d <<EOG | $CMD > /dev/null
$(pass $PASSKEY | base64)
EOG
EOF
}
for NIXHOST in $NIXHOSTLIST; do
NIXHOST=${NIXHOST%.*}
if [ -z "$SSH_USER" ]; then
SSH_DEST=$NIXHOST
else
SSH_DEST=$SSH_USER@$NIXHOST
fi
echo "==== DOING $NIXHOST ===="
(header; . $CMDFILE; footer) | ssh -F $SSH_CONFIG $SSH_DEST sh -
done