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generate random password for root as initial configuration

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Some cloud providers allow web console login (Hetzner Cloud, for example).
You can then login and fix network issues (if any).

This change generates a password for root, so it is 1 step easier to do.
This commit is contained in:
Danylo Hlynskyi 2019-10-10 11:59:51 +02:00
parent ba58e54ee9
commit f562ed2b12
1 changed files with 17 additions and 0 deletions
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17
nixos-infect
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@ -4,11 +4,17 @@
set -e -o pipefail set -e -o pipefail
ROOT_PASSWORD=
makeConf() { makeConf() {
# Skip everything if main config already present # Skip everything if main config already present
[[ -e /etc/nixos/configuration.nix ]] && return 0 [[ -e /etc/nixos/configuration.nix ]] && return 0
# NB <<"EOF" quotes / $ ` in heredocs, <<EOF does not # NB <<"EOF" quotes / $ ` in heredocs, <<EOF does not
mkdir -p /etc/nixos mkdir -p /etc/nixos
# generate some default password, to make login possible if network is down
set +o pipefail
ROOT_PASSWORD="$(cat /dev/urandom | tr -dc _A-Z-a-z-0-9 | head -c12)"
set -o pipefail
# Prevent grep for sending error code 1 (and halting execution) when no lines are selected : https://www.unix.com/man-page/posix/1P/grep # Prevent grep for sending error code 1 (and halting execution) when no lines are selected : https://www.unix.com/man-page/posix/1P/grep
local IFS=$'\n'; keys=($(grep -vE '^[[:space:]]*(#|$)' /root/.ssh/authorized_keys || [[ $? == 1 ]])) local IFS=$'\n'; keys=($(grep -vE '^[[:space:]]*(#|$)' /root/.ssh/authorized_keys || [[ $? == 1 ]]))
local network_import="" local network_import=""
@ -29,6 +35,9 @@ makeConf() {
users.users.root.openssh.authorizedKeys.keys = [$(for key in "${keys[@]}"; do echo -n " users.users.root.openssh.authorizedKeys.keys = [$(for key in "${keys[@]}"; do echo -n "
\"$key\""; done) \"$key\""; done)
]; ];
$([ -n "$ROOT_PASSWORD" ] && echo "
users.users.root.password = ''$ROOT_PASSWORD'';
")
} }
EOF EOF
# If you rerun this later, be sure to prune the filesSystems attr # If you rerun this later, be sure to prune the filesSystems attr
@ -262,6 +271,14 @@ makeConf
infect infect
removeSwap removeSwap
if [ -n "$ROOT_PASSWORD" ]; then
echo "-----"
echo "Root password set: $ROOT_PASSWORD"
echo "You can use it if instance is not reachable through SSH. Don't forget to change it after infection complete."
echo "-----"
fi
if [[ -z "$NO_REBOOT" ]]; then if [[ -z "$NO_REBOOT" ]]; then
reboot reboot
fi fi