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feat: auto-detect BIND paths via os.path.exists fallback chain

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环境变量 > 自动探测 > 内置默认值。自动探测按发行版常见路径顺序
回退（Debian/Ubuntu / RHEL/CentOS/Rocky / AlmaLinux / FreeBSD），
大多数情况下无需任何配置。

新增探测函数 _detect_bind_path() 与候选路径字典 _BIND_PATH_CANDIDATES，
覆盖以下发行版默认布局：

  BIND_CONF_DIR:     /etc/bind -> /etc -> /etc/named
  BIND_ZONES_DIR:    /etc/bind/zones -> /var/named -> /var/named/data
  BIND_CONF_LOCAL:   /etc/bind/named.conf.local -> /etc/named.conf.local
  BIND_CONF_OPTIONS: /etc/bind/named.conf.options -> /etc/named.conf
  BIND_RNDC_KEY:     /etc/bind/rndc.key -> /etc/rndc.key -> /var/named/key

环境变量仍然作为最高优先级入口，用于非标准路径或多实例场景。

README 第 5 节改名为'路径优先级'，列出三层优先级与探测顺序。
This commit is contained in:
Hermes
2026-07-22 17:31:52 +08:00
parent 1b15592f4d
commit 3d417421ff
2 changed files with 50 additions and 26 deletions
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app.py
+24 -9
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@@ -27,15 +27,30 @@ app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False
db = SQLAlchemy(app)
# ─── BIND paths ───
# Defaults are Debian/Ubuntu (bind9). Override via env on RHEL/CentOS/Rocky:
# BIND_CONF_DIR=/etc BIND_CONF_LOCAL=/etc/named.conf
# BIND_ZONES_DIR=/var/named BIND_CONF_OPTIONS=/etc/named.conf.options
# BIND_RNDC_KEY=/etc/rndc.key
BIND_CONF_DIR = os.environ.get("BIND_CONF_DIR", "/etc/bind")
BIND_ZONES_DIR = os.environ.get("BIND_ZONES_DIR", "/etc/bind/zones")
BIND_CONF_LOCAL = os.environ.get("BIND_CONF_LOCAL", "/etc/bind/named.conf.local")
BIND_CONF_OPTIONS = os.environ.get("BIND_CONF_OPTIONS", "/etc/bind/named.conf.options")
BIND_RNDC_KEY = os.environ.get("BIND_RNDC_KEY", "/etc/bind/rndc.key")
# 优先级：环境变量 > 自动探测 > 内置默认值。
# 自动探测按"哪个目录/文件存在就用谁"在常见路径里回退，覆盖 Debian/Ubuntu、
# RHEL/CentOS/Rocky、AlmaLinux、FreeBSD 等发行版默认布局；如有特殊安装路径，
# 可用环境变量强制指定。
_BIND_PATH_CANDIDATES = {
"BIND_CONF_DIR": ["/etc/bind", "/etc", "/etc/named"],
"BIND_ZONES_DIR": ["/etc/bind/zones", "/var/named", "/var/named/data"],
"BIND_CONF_LOCAL": ["/etc/bind/named.conf.local", "/etc/named.conf.local"],
"BIND_CONF_OPTIONS": ["/etc/bind/named.conf.options", "/etc/named.conf"],
"BIND_RNDC_KEY": ["/etc/bind/rndc.key", "/etc/rndc.key", "/var/named/key"],
}
def _detect_bind_path(candidates):
"""Return first existing path in candidates; fall back to first (built-in default)."""
for p in candidates:
if os.path.exists(p):
return p
return candidates[0]
BIND_CONF_DIR = os.environ.get("BIND_CONF_DIR", _detect_bind_path(_BIND_PATH_CANDIDATES["BIND_CONF_DIR"]))
BIND_ZONES_DIR = os.environ.get("BIND_ZONES_DIR", _detect_bind_path(_BIND_PATH_CANDIDATES["BIND_ZONES_DIR"]))
BIND_CONF_LOCAL = os.environ.get("BIND_CONF_LOCAL", _detect_bind_path(_BIND_PATH_CANDIDATES["BIND_CONF_LOCAL"]))
BIND_CONF_OPTIONS = os.environ.get("BIND_CONF_OPTIONS", _detect_bind_path(_BIND_PATH_CANDIDATES["BIND_CONF_OPTIONS"]))
BIND_RNDC_KEY = os.environ.get("BIND_RNDC_KEY", _detect_bind_path(_BIND_PATH_CANDIDATES["BIND_RNDC_KEY"]))
BIND_SERVICE = os.environ.get("BIND_SERVICE", "named")
# ─── Record types ───