# HG changeset patch
# User Simon Sapin <simon.sapin@octobus.net>
# Date 2021-03-12 17:45:32
# Node ID 08a35cec14d426ceb54bd7bc45a459182d92c66a
# Parent  e3f15c5535220d3b489aa696f63ecd6b7c618e09

rhg: Add environment variables for fallback configuration

For the `rust-tests.py --rhg` we want every `hg` command in tests
to run `rhg` with fallback enabled, but other methods of setting
configuration are limited or disruptive as discussed in code comment.

Differential Revision: https://phab.mercurial-scm.org/D10186

diff --git a/rust/hg-core/src/config/config.rs b/rust/hg-core/src/config/config.rs
--- a/rust/hg-core/src/config/config.rs
+++ b/rust/hg-core/src/config/config.rs
@@ -78,9 +78,27 @@ impl Config {
         if opt_rc_path.is_none() {
             config.add_system_config()?
         }
+
         config.add_for_environment_variable("EDITOR", b"ui", b"editor");
         config.add_for_environment_variable("VISUAL", b"ui", b"editor");
         config.add_for_environment_variable("PAGER", b"pager", b"pager");
+
+        // These are set by `run-tests.py --rhg` to enable fallback for the
+        // entire test suite. Alternatives would be setting configuration
+        // through `$HGRCPATH` but some tests override that, or changing the
+        // `hg` shell alias to include `--config` but that disrupts tests that
+        // print command lines and check expected output.
+        config.add_for_environment_variable(
+            "RHG_ON_UNSUPPORTED",
+            b"rhg",
+            b"on-unsupported",
+        );
+        config.add_for_environment_variable(
+            "RHG_FALLBACK_EXECUTABLE",
+            b"rhg",
+            b"fallback-executable",
+        );
+
         // HGRCPATH replaces user config
         if opt_rc_path.is_none() {
             config.add_user_config()?