Document agent secret vault installation

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# Agent 安裝 Runbookagent-secret-vault
這份文件給 AI agent / cron worker / automation 使用。目標:把 `agent-secret-vault` 安裝好、缺檔時建立 placeholder、並能安全讀取 secrets。
## 安全規則
- 不要把 secret value、vault password、token、private key 印到 chat / log / 工單 comment。
- 不要 dump 整份解密後的 `secrets/vault.yml`
- 只讀取任務所需的單一欄位。
- 所有暫存解密檔用完立即刪除。
## 目標路徑
- Repo`~/projects/agent-secret-vault`
- Vault 檔:`~/projects/agent-secret-vault/secrets/vault.yml`
- Vault password file`~/.config/vault-pass.txt`
- 可覆寫環境變數:`VAULT_PASS_FILE=/custom/path`
## 1. 安裝系統依賴
```bash
sudo apt update
sudo apt install -y git ansible unzip
```
驗證:
```bash
command -v git
command -v ansible-vault
command -v unzip
```
## 2. Clone repo
```bash
mkdir -p ~/projects
cd ~/projects
if [ ! -d agent-secret-vault/.git ]; then
git clone ssh://git@gitea.cowbay.org:2203/hermes/agent-secret-vault.git
fi
cd agent-secret-vault
```
若 clone 失敗,建立 placeholder 讓後續步驟可明確回報缺什麼:
```bash
mkdir -p ~/projects/agent-secret-vault/{scripts,secrets,docs}
cat > ~/projects/agent-secret-vault/README.PLACEHOLDER.md <<'PLACEHOLDER'
# Placeholder
agent-secret-vault repo 尚未成功 clone。
需要 Gitea SSH 權限ssh://git@gitea.cowbay.org:2203/hermes/agent-secret-vault.git
PLACEHOLDER
```
然後回報人類:需要把此 agent / 機器的 SSH public key 加到 Gitea 或 deploy key。
## 3. 安裝 vault password file
標準位置:
```text
~/.config/vault-pass.txt
```
安裝來源是 repo 內的密碼保護壓縮檔:
```text
secrets/vault-pass.txt.zip
```
執行:
```bash
cd ~/projects/agent-secret-vault
./scripts/install-vault-pass.sh
```
安裝過程會要求使用者手動輸入壓縮檔密碼;解壓成功後會寫入:
```text
~/.config/vault-pass.txt
```
權限應為 `600`
### 若壓縮檔不存在
建立 placeholder不要自行編造密碼
```bash
mkdir -p ~/projects/agent-secret-vault/secrets
cat > ~/projects/agent-secret-vault/secrets/vault-pass.txt.zip.PLACEHOLDER <<'PLACEHOLDER'
Missing file: secrets/vault-pass.txt.zip
Purpose: password-protected archive containing vault-pass.txt
Action: ask human maintainer to provide this archive or commit it to the private repo.
PLACEHOLDER
```
然後回報人類:缺 `secrets/vault-pass.txt.zip`,需要提供。
### 若要用非預設路徑
```bash
export VAULT_PASS_FILE=/path/to/vault-pass.txt
./scripts/install-vault-pass.sh /path/to/vault-pass.txt.zip
```
## 4. 驗證安裝
```bash
cd ~/projects/agent-secret-vault
ansible-vault view secrets/vault.yml --vault-password-file ~/.config/vault-pass.txt >/dev/null
```
成功exit code 0。失敗時只回報錯誤摘要不要輸出密碼或 vault 內容。
## 5. 讀取單一 secret
```bash
cd ~/projects/agent-secret-vault
./scripts/get-secret.sh <dot.path>
```
範例:
```bash
./scripts/get-secret.sh gitea.api_token
./scripts/get-secret.sh openclaw_alice.http_nodes.gitea.password
```
把輸出直接交給需要 secret 的動作使用;不要貼到 chat / log。
## 6. Worker 需要 env 時
```bash
cd ~/projects/agent-secret-vault
umask 077
./scripts/render-env.sh gitea > /tmp/gitea.env
set -a
. /tmp/gitea.env
set +a
rm -f /tmp/gitea.env
```
使用完如果擔心環境被 dump執行 `unset` 清掉相關變數。
## 7. 更新 secret 的 agent 流程
只有在人類明確要求更新 secrets 時才做:
```bash
cd ~/projects/agent-secret-vault
git pull --ff-only
./scripts/vault.sh edit
ansible-vault view secrets/vault.yml --vault-password-file ~/.config/vault-pass.txt >/dev/null
git add secrets/vault.yml
git commit -m "Update secret <key-name>"
git push
```
回報只包含 key 名稱、commit hash、驗證方式不要包含 secret value。