krebs pkgs pssh: init

krebs/5pkgs/default.nix

@@ -18,6 +18,7 @@ rec {
   much = callPackage ./much {};
   nq = callPackage ./nq {};
   posix-array = callPackage ./posix-array {};
+  pssh = callPackage ./pssh {};
   youtube-tools = callPackage ./youtube-tools {};
 
   execve = name: { filename, argv, envp ? {}, destination ? "" }:

krebs/5pkgs/pssh/default.nix

@@ -0,0 +1,37 @@
+{ writeScriptBin }:
+
+writeScriptBin "pssh" ''
+  #! /bin/sh
+  set -efu
+  case ''${1-} in
+
+  # TODO create plog with -o json | jq ... | map date
+
+  # usage: pssh {-j,--journal} host...
+  # Follow journal at each host.
+  -j|--journal)
+    shift
+    "$0" journalctl -n0 -ocat --follow --all ::: "$@" \
+      | while read line; do
+          printf '%s %s\n' "$(date --rfc-3339=s)" "$line"
+        done
+    ;;
+
+  -*)
+    echo $0: unknown option: $1 >&2
+    exit 1
+    ;;
+
+  # usage: pssh command [arg...] ::: host...
+  # Run command at each host.
+  *)
+    exec parallel \
+      --line-buffer \
+      -j0 \
+      --no-notice \
+      --tagstring {} \
+      ssh -T {} "$@"
+    ;;
+
+  esac
+''