errors: let each Abort subclass define its error code

errors: let each Abort subclass define its error code

It's more flexible to have the error codes defined on the error types
themselves. That way extensions can easily set their own exit code. It
also means that we can reduce a bit of duplication betwen
`scmutil.callcatch()` and `chgserver.chgcmdserver.validate()`.

Differential Revision: https://phab.mercurial-scm.org/D10735

--- a/mercurial/chgserver.py	Wed May 19 15:10:49 2021 +0200
+++ b/mercurial/chgserver.py	Tue May 18 17:15:49 2021 -0700
@@ -516,10 +516,8 @@
                 self.ui.error(_(b"(%s)\n") % inst.hint)
             errorraised = True
         except error.Abort as inst:
-            if isinstance(inst, error.InputError):
-                detailed_exit_code = 10
-            elif isinstance(inst, error.ConfigError):
-                detailed_exit_code = 30
+            if inst.detailed_exit_code is not None:
+                detailed_exit_code = inst.detailed_exit_code
             self.ui.error(inst.format())
             errorraised = True
 

--- a/mercurial/error.py	Wed May 19 15:10:49 2021 +0200
+++ b/mercurial/error.py	Tue May 18 17:15:49 2021 -0700
@@ -185,10 +185,11 @@
 class Abort(Hint, Exception):
     """Raised if a command needs to print an error and exit."""
 
-    def __init__(self, message, hint=None):
+    def __init__(self, message, hint=None, detailed_exit_code=None):
         # type: (bytes, Optional[bytes]) -> None
         self.message = message
         self.hint = hint
+        self.detailed_exit_code = detailed_exit_code
         # Pass the message into the Exception constructor to help extensions
         # that look for exc.args[0].
         Exception.__init__(self, message)
@@ -220,6 +221,11 @@
     Examples: Invalid command, invalid flags, invalid revision.
     """
 
+    def __init__(self, message, hint=None):
+        super(InputError, self).__init__(
+            message, hint=hint, detailed_exit_code=10
+        )
+
 
 class StateError(Abort):
     """Indicates that the operation might work if retried in a different state.
@@ -227,6 +233,11 @@
     Examples: Unresolved merge conflicts, unfinished operations.
     """
 
+    def __init__(self, message, hint=None):
+        super(StateError, self).__init__(
+            message, hint=hint, detailed_exit_code=20
+        )
+
 
 class CanceledError(Abort):
     """Indicates that the user canceled the operation.
@@ -234,6 +245,11 @@
     Examples: Close commit editor with error status, quit chistedit.
     """
 
+    def __init__(self, message, hint=None):
+        super(CanceledError, self).__init__(
+            message, hint=hint, detailed_exit_code=250
+        )
+
 
 class SecurityError(Abort):
     """Indicates that some aspect of security failed.
@@ -242,6 +258,11 @@
     filesystem, mismatched GPG signature, DoS protection.
     """
 
+    def __init__(self, message, hint=None):
+        super(SecurityError, self).__init__(
+            message, hint=hint, detailed_exit_code=150
+        )
+
 
 class HookLoadError(Abort):
     """raised when loading a hook fails, aborting an operation
@@ -254,13 +275,20 @@
 
     Exists to allow more specialized catching."""
 
+    def __init__(self, message, hint=None):
+        super(HookAbort, self).__init__(
+            message, hint=hint, detailed_exit_code=40
+        )
+
 
 class ConfigError(Abort):
     """Exception raised when parsing config files"""
 
     def __init__(self, message, location=None, hint=None):
         # type: (bytes, Optional[bytes], Optional[bytes]) -> None
-        super(ConfigError, self).__init__(message, hint=hint)
+        super(ConfigError, self).__init__(
+            message, hint=hint, detailed_exit_code=30
+        )
         self.location = location
 
     def format(self):
@@ -307,6 +335,11 @@
 class RemoteError(Abort):
     """Exception raised when interacting with a remote repo fails"""
 
+    def __init__(self, message, hint=None):
+        super(RemoteError, self).__init__(
+            message, hint=hint, detailed_exit_code=100
+        )
+
 
 class OutOfBandError(RemoteError):
     """Exception raised when a remote repo reports failure"""
@@ -327,7 +360,9 @@
 
     def __init__(self, message, location=None, hint=None):
         # type: (bytes, Optional[Union[bytes, int]], Optional[bytes]) -> None
-        super(ParseError, self).__init__(message, hint=hint)
+        super(ParseError, self).__init__(
+            message, hint=hint, detailed_exit_code=10
+        )
         self.location = location
 
     def format(self):

--- a/mercurial/scmutil.py	Wed May 19 15:10:49 2021 +0200
+++ b/mercurial/scmutil.py	Tue May 18 17:15:49 2021 -0700
@@ -212,20 +212,8 @@
     except error.WdirUnsupported:
         ui.error(_(b"abort: working directory revision cannot be specified\n"))
     except error.Abort as inst:
-        if isinstance(inst, (error.InputError, error.ParseError)):
-            detailed_exit_code = 10
-        elif isinstance(inst, error.StateError):
-            detailed_exit_code = 20
-        elif isinstance(inst, error.ConfigError):
-            detailed_exit_code = 30
-        elif isinstance(inst, error.HookAbort):
-            detailed_exit_code = 40
-        elif isinstance(inst, error.RemoteError):
-            detailed_exit_code = 100
-        elif isinstance(inst, error.SecurityError):
-            detailed_exit_code = 150
-        elif isinstance(inst, error.CanceledError):
-            detailed_exit_code = 250
+        if inst.detailed_exit_code is not None:
+            detailed_exit_code = inst.detailed_exit_code
         ui.error(inst.format())
     except error.WorkerError as inst:
         # Don't print a message -- the worker already should have