just-mr: Add git binary option

In the rare cases that we need to shell out to git, let the user
configure what binary to use. Option resolves in the same way as
the just executable, including allowing it to be set via just-mrrc.

Updates all cases of shelling out to git (fetch and commit update).

Update just-mr and just-mrrc docs accordingly.

1 files changed, 20 insertions, 8 deletions

diff --git a/src/other_tools/root_maps/commit_git_map.cpp b/src/other_tools/root_maps/commit_git_map.cpp
index 3500245b..48cf4d8f 100644
--- a/src/other_tools/root_maps/commit_git_map.cpp
+++ b/src/other_tools/root_maps/commit_git_map.cpp
@@ -36,6 +36,7 @@ void EnsureCommit(GitRepoInfo const& repo_info,
                   std::filesystem::path const& repo_root,
                   GitCASPtr const& git_cas,
                   gsl::not_null<CriticalGitOpMap*> const& critical_git_op_map,
+                  std::string const& git_bin,
                   std::vector<std::string> const& launcher,
                   gsl::not_null<TaskSystem*> const& ts,
                   CommitGitMap::SetterPtr const& ws_setter,
@@ -77,6 +78,7 @@ void EnsureCommit(GitRepoInfo const& repo_info,
         if (not git_repo->FetchViaTmpRepo(tmp_dir->GetPath(),
                                           repo_info.repo_url,
                                           repo_info.branch,
+                                          git_bin,
                                           launcher,
                                           wrapped_logger)) {
             return;
@@ -186,14 +188,17 @@ void EnsureCommit(GitRepoInfo const& repo_info,
 auto CreateCommitGitMap(
     gsl::not_null<CriticalGitOpMap*> const& critical_git_op_map,
     JustMR::PathsPtr const& just_mr_paths,
+    std::string const& git_bin,
     std::vector<std::string> const& launcher,
     std::size_t jobs) -> CommitGitMap {
-    auto commit_to_git = [critical_git_op_map, just_mr_paths, launcher](
-                             auto ts,
-                             auto setter,
-                             auto logger,
-                             auto /* unused */,
-                             auto const& key) {
+    auto commit_to_git = [critical_git_op_map,
+                          just_mr_paths,
+                          git_bin,
+                          launcher](auto ts,
+                                    auto setter,
+                                    auto logger,
+                                    auto /* unused */,
+                                    auto const& key) {
         // get root for repo (making sure that if repo is a path, it is
         // absolute)
         std::string fetch_repo = key.repo_url;
@@ -217,8 +222,14 @@ auto CreateCommitGitMap(
         critical_git_op_map->ConsumeAfterKeysReady(
             ts,
             {std::move(op_key)},
-            [key, repo_root, critical_git_op_map, launcher, ts, setter, logger](
-                auto const& values) {
+            [key,
+             repo_root,
+             critical_git_op_map,
+             git_bin,
+             launcher,
+             ts,
+             setter,
+             logger](auto const& values) {
                 GitOpValue op_result = *values[0];
                 // check flag
                 if (not op_result.result) {
@@ -240,6 +251,7 @@ auto CreateCommitGitMap(
                              repo_root,
                              op_result.git_cas,
                              critical_git_op_map,
+                             git_bin,
                              launcher,
                              ts,
                              setter,