# pijul-encrypt
Pijul hook to encrypt files using GnuPG in Pijul repositry before recording.
Add globs matching paths you want to encrypt to `.encrypt`.
Register your and collaborators GnuPG public key using `.pijul/encrypt/add-recipients.sh`.
Files will be encrypted both asymmetricaly and symmetricaly.
Symmetric key can be retrieved by decrypting `.encrypt.d/master_key.gpg`.
GnuPGでrecord前にファイルを暗号化するPijulフック。
`.encrypt`に記入したグロブパターンにマッチするファイルを暗号化します。
`.pijul/encrypt/add-recipients.sh`で自分や共同編集者のGnuPG公開鍵を登録できます。
ファイルは公開鍵暗号と共通鍵暗号の両方で暗号化されます。
共通鍵は `.encrypt.d/master_key.gpg`を復号することで確認できます。
``` toml
[hooks]
record = [".pijul/encrypt/hook-record.sh"]
```
Master key for this example repositry.
例示のためのこのレポジトリのマスターキー
```
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
```

.git
.DS_Store

secret/*

#!/bin/sh
set -e
IFS='
'
if ! gpg=$(command -v gpg2) >/dev/null; then
  echo "$0 requires gpg2" >&2
  false
fi

#!/bin/sh
[ -d .pijul ] || {
  echo 'this directory does not seem to be Pijul repositry.' >&2
  false
}
. .pijul/encrypt/scripts.sh
if [ -f .encrypt.d/master_key.gpg ]; then
  echo 'pijul-encrypt already configured!'
  false
fi
recipients="$*"
[ "$recipients" ] || {
  echo 'Specify recipients fingerprints.'
  read -r recipients
}
(
  IFS=' '
  .pijul/encrypt/add-recipients.sh $recipients
)
echo 'generating master key...'
master_key=$($gpg --armor --gen-random 16 512)
echo "master key generated: $master_key"
printf %s "$master_key" | $gpg --batch --sign --encrypt \
  $(printf -- '--recipient-file\n%s\n' .encrypt.d/recipient/*.asc) \
  --output .encrypt.d/master_key.gpg
echo "Now add .pijul/encrypt/hook-record.sh to record hook.
edit .pijul/config as below:
\`\`\`
[hooks]
record = ['.pijul/encrypt/hook-record.sh']
\`\`\`
"

#!/bin/sh
. .pijul/encrypt/scripts.sh
if ! sha256sum=$(command -v sha256sum) >/dev/null; then
  echo "$0 requires sha256sum" >&2
  false
fi
if [ ! -f .encrypt.d/master_key.gpg ]; then
  echo "No master key in repositry. Repositry not initialized for pijul-encrypt" >&2
  false
fi
encrypt() {
  path=$1
  $gpg --decrypt .encrypt.d/master_key.gpg |
    $gpg --batch --passphrase-fd 0 \
      --sign --encrypt --symmetric \
      $(printf -- "--recipient-file$IFS%s$IFS" .encrypt.d/recipient/*.asc) "$path"
}
decrypt() {
  path=$1
  $gpg --decrypt .encrypt.d/master_key.gpg |
    $gpg --batch --output - --passphrase-fd 0 \
      --decrypt "$path"
}
# globを展開、マッチするディレクトリの中身も全部マッチしたいのでfindを噛ませる
# shellcheck disable=SC2046
worktree_glob=$(find $(cat .encrypt) -type f -not -name '*.gpg' || true)
: "↓debug worktree_glob↓
$worktree_glob"
# pijulが記録しているパスのうち`.encrypt`にマッチするもの
# shellcheck disable=SC2086
# shellcheck disable=SC2046
tracked_glob=$(printf '%s\n' $worktree_glob $(pijul list) | sort | uniq -d)
: "↓debug tracked_glob↓
$tracked_glob"
# shellcheck disable=SC2086
pijul remove $tracked_glob # 秘密のファイルはさっさと記録から除外
# pijulが記録しているパスのうち`*.gpg`にマッチするもの (pijul listが変わってるのでtracked_globとは重複しない)
gpg_tracked=$(pijul list | grep '\.gpg$' | sed 's/\.gpg$//')
: "↓debug gpg_tracked↓
$gpg_tracked"
# 秘密にしなければいけないファイルたち
will_be_encrypted="$tracked_glob
$gpg_tracked"
# 秘密のファイルに変更があれば暗号化し直す
for path in $will_be_encrypted; do
  if [ ! -f "$path" ]; then
    [ "$path" = ".encrypt.d/master_key" ] || pijul remove "$path.gpg"
  else
    if [ -f "$path.gpg" ] &&
      [ "$($sha256sum <"$path")" != "$(decrypt "$path.gpg" | $sha256sum)" ]; then
      rm "$path.gpg"
    fi
    if [ ! -e "$path.gpg" ]; then
      encrypt "$path"
    fi
    pijul add "$path.gpg"
  fi
done

#!/bin/sh
[ -d .pijul ] || {
  echo 'this directory does not seem to be Pijul repositry.' >&2
  false
}
. .pijul/encrypt/scripts.sh
[ "$*" ] || {
  echo 'Please supply the recipients fingerprints as arguments.' >&2
  false
}
mkdir -p .encrypt.d/recipient/
for recipient in "$@"; do
  gpg --armor --export "$recipient" >".encrypt.d/recipient/$recipient.asc"
done
if [ -f .encrypt.d/master_key.gpg ]; then
  echo 're-encrypting master key...'
  $gpg --decrypt .encrypt.d/master_key.gpg |
    $gpg --batch --sign --encrypt \
      $(printf -- "--recipient-file$IFS%s$IFS" .encrypt.d/recipient/*.asc) \
      --output .encrypt.d/master_key.gpg.tmp
  mv .encrypt.d/master_key.gpg.tmp .encrypt.d/master_key.gpg
  echo 'done'
fi

-----BEGIN PGP PUBLIC KEY BLOCK-----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=PKBP
-----END PGP PUBLIC KEY BLOCK-----