add thing for when known hosts have changed

thefuck/rules/ssh_known_hosts.py

@@ -0,0 +1,38 @@
+import re
+patterns = [
+    r'WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!',
+    r'WARNING: POSSIBLE DNS SPOOFING DETECTED!',
+    r"Warning: the \S+ host key for '([^']+)' differs from the key for the IP address '([^']+)'",
+]
+offending_pattern = re.compile(
+    r'(?:Offending (?:key for IP|\S+ key)|Matching host key) in ([^:]+):(\d+)',
+    re.MULTILINE)
+
+commands = ['ssh', 'scp']
+
+
+def match(command, settings):
+    if not command.script:
+        return False
+    if not command.script.split()[0] in commands:
+        return False
+    if not any([re.findall(pattern, command.stderr) for pattern in patterns]):
+        return False
+    return True
+
+
+def remove_offending_keys(command, settings):
+    offending = offending_pattern.findall(command.stderr)
+    print offending
+    for filepath, lineno in offending:
+        with open(filepath, 'r') as fh:
+            lines = fh.readlines()
+            del lines[int(lineno) - 1]
+            print lines
+        with open(filepath, 'w') as fh:
+            fh.writelines(lines)
+
+
+def get_new_command(command, settings):
+    remove_offending_keys(command, settings)
+    return command.script