allow modifying lockfile commit msg with nix config option

This allows setting the commit-lockfile-summary option to a non-empty
string to override the commit summary while leaving the body unchanged.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh
index 1911ec855..f65893b10 100644
--- a/src/libstore/globals.hh
+++ b/src/libstore/globals.hh
@@ -966,6 +966,13 @@ public:
 
     Setting<bool> acceptFlakeConfig{this, false, "accept-flake-config",
         "Whether to accept nix configuration from a flake without prompting."};
+
+    Setting<std::string> commitLockFileSummary{
+        this, "", "commit-lockfile-summary",
+        R"(
+          The commit summary to use when commiting changed flake lock files. If
+          empty, the summary is generated based on the action performed.
+        )"};
 };