fallback to localhost if detecting dnsserver fails

Dockerfile

@@ -129,7 +129,7 @@ RUN --mount=type=cache,target=/var/cache/apt,sharing=locked,id=apt-$TARGETARCH$T
         # 1. packaging dependencies
         apt-transport-https ca-certificates apt-utils gnupg2 curl wget \
         # 2. docker and init system dependencies
-        zlib1g-dev dumb-init gosu cron unzip grep \
+        zlib1g-dev dumb-init gosu cron unzip grep dnsutils \
         # 3. frivolous CLI helpers to make debugging failed archiving easier
         # nano iputils-ping dnsutils htop procps jq yq
     && rm -rf /var/lib/apt/lists/*

archivebox/abx/archivebox/base_binary.py

@@ -66,7 +66,7 @@ class BaseBinary(BaseHook, Binary):
             symlink.unlink(missing_ok=True)
             symlink.symlink_to(binary.abspath)
         except Exception as err:
-            # print('[red]:caution: Failed to symlink binary into ./lib/bin folder[/red]', err)
+            # print('[red]:warning: Failed to symlink binary into ./lib/bin folder[/red]', err)
             pass
 
     @validate_call

archivebox/machine/detect.py

@@ -167,7 +167,11 @@ def get_isp_info(ip=None):
         result = subprocess.run(['dig', 'example.com', 'A'], capture_output=True, text=True, check=True).stdout
         dns_server = result.split(';; SERVER: ', 1)[-1].split('\n')[0].split('#')[0].strip()
     except Exception:
-        pass
+        try:
+            dns_server = Path('/etc/resolv.conf').read_text().split('nameserver ', 1)[-1].split('\n')[0].strip()
+        except Exception:
+            dns_server = '127.0.0.1'
+            print(f'[red]:warning: WARNING: Could not determine DNS server, using {dns_server}[/red]')
     
     # Get DNS resolver's ISP name
     # url = f'https://ipapi.co/{dns_server}/json/'