chore: initial commit

README.md

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+# GPG Pinentry inside TMUX
+
+See it in action:
+[![asciicast](https://asciinema.org/a/UE29nOhgOVwjESVIoj1ftFqWt.svg)](https://asciinema.org/a/UE29nOhgOVwjESVIoj1ftFqWt)
+
+## Installation
+
+1. add your fallback pinentry to `pinentry-tmux.sh`
+2. put the shell script in your path, eg. `~/.local/bin/pinentry-tmux` (without `.sh`)
+3. configure gpg to use `pinentry-tmux` for pinentry
+

pinentry-tmux.sh

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+#!/usr/bin/env bash
+set -eo pipefail
+
+# fallback if empty
+if [[ -z "$PINENTRY_USER_DATA" ]]; then
+  # TODO: add your fallback pinentry here
+  exec <fallback-pinentry> "$@"
+fi
+
+if [[ "$PINENTRY_USER_DATA" != "tmux" ]]; then 
+  echo "Unsupported pinentry type in PINENTRY_USER_DATA"
+  exit 1
+fi
+
+DESCFILE=$(mktemp)
+
+cleanup() {
+  rm -f "$DESCFILE"
+}
+trap cleanup EXIT
+
+prompt="PIN:"
+
+echo "OK Please go ahead"
+while read cmd rest; do
+  case "$cmd" in
+    SETDESC)
+      echo "$(tput setaf 8)$(echo "$rest" | sed -e 's/%0A/\n/g' -e 's/%22/"/g')$(tput sgr0)" > $DESCFILE
+      echo "OK"
+      ;;
+    SETPROMPT)
+      prompt="$(tput smul)$rest$(tput sgr0)"
+      echo "OK"
+      ;;
+    GETPIN)
+      PIPE=$(mktemp -u)
+      mkfifo "$PIPE"
+      chmod 600 "$PIPE"
+
+      tmux display-popup -w 70 -h 7 -E "bash -c 'cat $DESCFILE; echo -n \"$prompt \"; read -s pw; echo \$pw > $PIPE'" &
+      PIN=$(<"$PIPE")
+      rm -f "$PIPE"
+      echo "D $PIN"
+      echo "OK"
+      ;;
+    BYE)
+      echo "OK"
+      exit 0
+      ;;
+    *)
+      echo "OK"
+      ;;
+  esac
+done
+