just profile: include exit code of actions

Extend the profile by including non-zero exit codes of individual
actions. When looking at an individual build invocation, the actions
with non-zero exit code are often the interesting ones, like root
cause of a build failure, or failing tests. Therefore, it is useful
information to include this information; by leaving out the exit
code if it is zero, we do not significantly increase the profile.

3 files changed, 8 insertions, 0 deletions

diff --git a/share/man/just-profile.5.md b/share/man/just-profile.5.md
index 70895efe..c04712af 100644
--- a/share/man/just-profile.5.md
+++ b/share/man/just-profile.5.md
@@ -53,6 +53,8 @@ The profile file contains the following information.
 
   - For the key *`"time"`* for non-cached actions the build time in seconds.
 
+  - For the key *`"exit code"`* the exit code of the action, if not 0.
+
   - For the key *`"artifacts"`* an object with keys the output paths and values
     the hashes of the corresponding artifacts as hex-encoded strings.
 
diff --git a/src/buildtool/profile/profile.cpp b/src/buildtool/profile/profile.cpp
index 6d1cc34d..225542e6 100644
--- a/src/buildtool/profile/profile.cpp
+++ b/src/buildtool/profile/profile.cpp
@@ -33,6 +33,9 @@ void Profile::Write(int exit_code) {
             if (not v.cached) {
                 entry["duration"] = v.duration;
             }
+            if (v.exit_code != 0) {
+                entry["exit code"] = v.exit_code;
+            }
             entry["artifacts"] = v.artifacts;
             if (v.out) {
                 entry["stdout"] = *v.out;
@@ -81,6 +84,7 @@ void Profile::NoteActionCompleted(std::string const& id,
         actions_[id] = ActionData{
             .cached = response->IsCached(),
             .duration = response->ExecutionDuration(),
+            .exit_code = response->ExitCode(),
             .out = out,
             .err = err,
             .artifacts = std::unordered_map<std::string, std::string>()};
@@ -89,6 +93,7 @@ void Profile::NoteActionCompleted(std::string const& id,
         actions_[id] = ActionData{
             .cached = response->IsCached(),
             .duration = response->ExecutionDuration(),
+            .exit_code = response->ExitCode(),
             .out = out,
             .err = err,
             .artifacts = std::unordered_map<std::string, std::string>(
diff --git a/src/buildtool/profile/profile.hpp b/src/buildtool/profile/profile.hpp
index 71511245..d90ad2a5 100644
--- a/src/buildtool/profile/profile.hpp
+++ b/src/buildtool/profile/profile.hpp
@@ -42,6 +42,7 @@ class Profile {
     struct ActionData {
         bool cached;
         double duration;
+        int exit_code;
         std::optional<std::string> out;
         std::optional<std::string> err;
         std::unordered_map<std::string, std::string> artifacts;