initial commit

scripts/ct.sh

@@ -0,0 +1,136 @@
+cmd=${1:-help}
+ct_name=${2:-}
+
+require_name() {
+  if [ -z "$ct_name" ]; then
+    echo "usage: ct $cmd <container>" >&2
+    exit 1
+  fi
+}
+
+case "$cmd" in
+  list)
+    sep() { printf '%0.s-' {1..60}; printf '\n'; }
+    uptime_str() {
+      awk '{s=int($1);d=int(s/86400);h=int((s%86400)/3600);m=int((s%3600)/60);
+        if(d>0)printf "%d days %d hours %d minutes",d,h,m;
+        else if(h>0)printf "%d hours %d minutes",h,m;
+        else printf "%d minutes",m}' /proc/uptime
+    }
+
+    printf 'HOST: %s  UP: %s\n' "$(hostname)" "$(uptime_str)"
+    sep
+
+    printf 'CONTAINERS\n'
+    mapfile -t all_units < <({
+      systemctl list-unit-files --no-legend --no-pager --plain 2>/dev/null
+      systemctl list-units --all --no-legend --no-pager --plain 2>/dev/null
+    } | awk '$1 ~ /^container@.+\.service$/ {print $1}' | sort -u)
+
+    if [ ${#all_units[@]} -gt 0 ]; then
+      systemctl show "${all_units[@]}" \
+        --property=Id,UnitFileState,ActiveState --no-pager 2>/dev/null \
+      | awk '
+        /^Id=container@/ { n=$0; sub(/^Id=container@/,"",n); sub(/\.service$/,"",n) }
+        /^UnitFileState=/ { f=$0; sub(/^UnitFileState=/,"",f) }
+        /^ActiveState=/   { a=$0; sub(/^ActiveState=/,"",a) }
+        /^[[:space:]]*$/ { if (n!="") { _print(); n=f=a="" } }
+        END              { if (n!="") _print() }
+        function _print() {
+          start = (f=="enabled") ? "auto" : "manual"
+          if      (a=="active")   st="running"
+          else if (a=="failed")   st="FAILED"
+          else if (a=="inactive") st="stopped"
+          else                    st=(a!="") ? a : "not-loaded"
+          mid = "-"
+          if (a == "active") {
+            midcmd = "machinectl show " n " -p Id --value 2>/dev/null"
+            got = ""
+            midcmd | getline got
+            close(midcmd)
+            if (got != "") mid = substr(got,1,12) "..."
+          }
+          printf "  %-35s %-8s %-10s %s\n", n, start, st, mid
+        }
+      '
+    else
+      printf '  none\n'
+    fi
+
+    sep
+
+    printf 'FAILED UNITS (host)\n'
+    failed=$(systemctl list-units --state=failed --no-legend --no-pager --plain 2>/dev/null \
+      | awk 'NF>0{print $1}')
+    if [ -z "$failed" ]; then printf '  none\n'
+    else printf '%s\n' "$failed" | sed 's/^/  /'; fi
+
+    sep
+
+    printf 'FAILED UNITS (containers)\n'
+    any_failed=0
+    machines=$(machinectl list --no-legend --no-pager 2>/dev/null | awk 'NF>0{print $1}')
+    for m in $machines; do
+      ct_failed=$(sudo systemctl -M "$m" list-units --state=failed \
+        --no-legend --no-pager --plain 2>/dev/null \
+        | awk 'NF>0 && $1!~/^container@/{print $1}' || true)
+      if [ -n "$ct_failed" ]; then
+        printf '  [%s]\n' "$m"
+        printf '%s\n' "$ct_failed" | sed 's/^/    /'
+        any_failed=1
+      fi
+    done
+    [ "$any_failed" -eq 0 ] && printf '  none\n'
+
+    sep
+
+    df -h /persist | awk 'NR==2{printf "DISK  %s used / %s total (%s)\n",$3,$2,$5}'
+    free -h | awk '/^Mem:/{printf "MEM   %s used / %s total\n",$3,$2}'
+    ;;
+  start)
+    require_name
+    sudo systemctl start "container@$ct_name"
+    ;;
+  stop)
+    require_name
+    sudo systemctl stop "container@$ct_name"
+    ;;
+  restart)
+    require_name
+    sudo systemctl restart "container@$ct_name"
+    ;;
+  status)
+    require_name
+    machinectl status "$ct_name"
+    ;;
+  logs)
+    require_name
+    shift 2
+    sudo journalctl -M "$ct_name" --no-hostname "$@"
+    ;;
+  shell)
+    require_name
+    exec sudo machinectl shell "$ct_name"
+    ;;
+  attach)
+    require_name
+    leader=$(machinectl show "$ct_name" -p Leader --value 2>/dev/null)
+    if [ -z "$leader" ] || [ "$leader" = "0" ]; then
+      printf 'error: container %s is not running\n' "$ct_name" >&2
+      exit 1
+    fi
+    exec sudo nsenter -m -t "$leader" -- dtach -a -r none /run/ct-attach/attach.sock
+    ;;
+  *)
+    printf 'usage: ct <cmd> [container]\n\n'
+    printf '  %-9s %-13s %s\n' \
+      "list"    ""             "list all containers with state (running/stopped/FAILED)" \
+      "start"   "<container>"  "start a container" \
+      "stop"    "<container>"  "stop a container" \
+      "restart" "<container>"  "restart a container" \
+      "status"  "<container>"  "show container status" \
+      "logs"    "<container>"  "view logs (extra args forwarded to journalctl)" \
+      "shell"   "<container>"  "open a shell" \
+      "attach"  "<container>"  "attach to Minecraft console (detach: Ctrl+\\)"
+    ;;
+esac

scripts/server-kexec.sh

@@ -0,0 +1,17 @@
+SYSTEM=${1:-/nix/var/nix/profiles/system}
+
+if [[ ! -e "$SYSTEM/kernel" ]]; then
+  echo "error: no kernel found at $SYSTEM" >&2
+  exit 1
+fi
+
+echo "kexec: loading $SYSTEM"
+echo "kernel-params: $(cat "$SYSTEM/kernel-params")"
+
+sudo kexec \
+  --load "$SYSTEM/kernel" \
+  --initrd="$SYSTEM/initrd" \
+  --command-line="$(cat "$SYSTEM/kernel-params") init=$SYSTEM/init"
+
+echo "kexec: executing (systemd will stop services first)"
+sudo systemctl kexec

scripts/server-rebuild.sh

@@ -0,0 +1 @@
+exec sudo nixos-rebuild switch --flake "/persist/@configuration#$(hostname)" "$@"

scripts/server-status.sh

@@ -0,0 +1,21 @@
+state=$(systemctl is-system-running 2>/dev/null || true)
+uptime_str() {
+  awk '{s=int($1);d=int(s/86400);h=int((s%86400)/3600);m=int((s%3600)/60);
+    if(d>0)printf "%d days %d hours",d,h;
+    else if(h>0)printf "%d hours %d min",h,m;
+    else printf "%d min",m}' /proc/uptime
+}
+printf 'HOST: %s  UP: %s  STATE: %s\n' "$(hostname)" "$(uptime_str)" "$state"
+printf '%0.s-' {1..60}; printf '\n'
+
+systemctl list-units --all --type=service \
+  --state=active,failed --no-legend --no-pager --plain 2>/dev/null \
+| awk '
+  NF >= 4 {
+    unit=$1; active=$3; sub=$4
+    if (unit ~ /^(getty@|console-getty\.service)/) next
+    if (unit ~ /^systemd-(tmpfiles|binfmt|modules-load|sysctl|ask-password|remount|random-seed|update-done|hibernate|sleep|suspend|reboot|poweroff)/) next
+    state = (active == "failed") ? "FAILED" : sub
+    printf "  %-50s %s\n", unit, state
+  }
+'