# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@octobus.net>
# Date 1616540698 -3600
# Node ID 395cf404e76a9aad0375d91959f63d6cd0427555
# Parent  1ecf082386b707d80d06caba6a9d3e75bdbe43b5
path: error out if the `path://` reference point to an unknown path

Differential Revision: https://phab.mercurial-scm.org/D10265

diff -r 1ecf082386b7 -r 395cf404e76a mercurial/ui.py
--- a/mercurial/ui.py	Tue Mar 23 23:55:33 2021 +0100
+++ b/mercurial/ui.py	Wed Mar 24 00:04:58 2021 +0100
@@ -2339,7 +2339,12 @@
     def chain_path(self, ui, paths):
         if self.url.scheme == b'path':
             assert self.url.path is None
-            subpath = paths[self.url.host]
+            try:
+                subpath = paths[self.url.host]
+            except KeyError:
+                m = _('cannot use `%s`, "%s" is not a known path')
+                m %= (self.rawloc, self.url.host)
+                raise error.Abort(m)
             if subpath.raw_url.scheme == b'path':
                 m = _('cannot use `%s`, "%s" is also define as a `path://`')
                 m %= (self.rawloc, self.url.host)
diff -r 1ecf082386b7 -r 395cf404e76a tests/test-paths.t
--- a/tests/test-paths.t	Tue Mar 23 23:55:33 2021 +0100
+++ b/tests/test-paths.t	Wed Mar 24 00:04:58 2021 +0100
@@ -370,3 +370,18 @@
   $ hg pull chain_path
   abort: cannot use `path://other_default`, "other_default" is also define as a `path://`
   [255]
+
+Test basic error cases
+----------------------
+
+  $ cat << EOF > .hg/hgrc
+  > [paths]
+  > error-missing=path://unknown
+  > EOF
+  $ hg path
+  abort: cannot use `path://unknown`, "unknown" is not a known path
+  [255]
+  $ hg pull error-missing
+  abort: cannot use `path://unknown`, "unknown" is not a known path
+  [255]
+