just-mr: Fix shell out execution

... by avoiding reusing temp dirs for execute. While we are
at it, also refactor LocalFetchViaTmpRepo() to create its
own empty temp dirs, that cannot be reused by the caller.

1 files changed, 20 insertions, 7 deletions

diff --git a/src/other_tools/git_operations/git_repo_remote.cpp b/src/other_tools/git_operations/git_repo_remote.cpp
index 2a434928..f3964e74 100644
--- a/src/other_tools/git_operations/git_repo_remote.cpp
+++ b/src/other_tools/git_operations/git_repo_remote.cpp
@@ -20,6 +20,7 @@
 #include "src/buildtool/logging/logger.hpp"
 #include "src/buildtool/system/system_command.hpp"
 #include "src/other_tools/git_operations/git_config_settings.hpp"
+#include "src/utils/cpp/tmp_dir.hpp"
 
 extern "C" {
 #include <git2.h>
@@ -392,7 +393,6 @@ auto GitRepoRemote::FetchFromRemote(std::shared_ptr<git_config> cfg,
 }
 
 auto GitRepoRemote::UpdateCommitViaTmpRepo(
-    std::filesystem::path const& tmp_dir,
     std::string const& repo_url,
     std::string const& branch,
     std::vector<std::string> const& inherit_env,
@@ -401,6 +401,13 @@ auto GitRepoRemote::UpdateCommitViaTmpRepo(
     anon_logger_ptr const& logger) const noexcept
     -> std::optional<std::string> {
     try {
+        auto tmp_dir = TmpDir::Create("update");
+        if (not tmp_dir) {
+            (*logger)("Failed to create temp dir for running 'git ls-remote'",
+                      /*fatal=*/true);
+            return std::nullopt;
+        }
+        auto const& tmp_path = tmp_dir->GetPath();
         // check for internally supported protocols
         if (IsSupported(repo_url)) {
             // preferably with a "fake" repository!
@@ -410,7 +417,7 @@ auto GitRepoRemote::UpdateCommitViaTmpRepo(
             }
             // create the temporary real repository
             auto tmp_repo =
-                GitRepoRemote::InitAndOpen(tmp_dir, /*is_bare=*/true);
+                GitRepoRemote::InitAndOpen(tmp_path / "git", /*is_bare=*/true);
             if (tmp_repo == std::nullopt) {
                 return std::nullopt;
             }
@@ -456,7 +463,7 @@ auto GitRepoRemote::UpdateCommitViaTmpRepo(
             system.Execute(cmdline,
                            env,
                            GetGitPath(),  // which path is not actually relevant
-                           tmp_dir);
+                           tmp_path);
 
         if (not command_output) {
             (*logger)(fmt::format("exec() on command failed."),
@@ -522,8 +529,7 @@ auto GitRepoRemote::UpdateCommitViaTmpRepo(
     }
 }
 
-auto GitRepoRemote::FetchViaTmpRepo(std::filesystem::path const& tmp_dir,
-                                    std::string const& repo_url,
+auto GitRepoRemote::FetchViaTmpRepo(std::string const& repo_url,
                                     std::optional<std::string> const& branch,
                                     std::vector<std::string> const& inherit_env,
                                     std::string const& git_bin,
@@ -531,6 +537,13 @@ auto GitRepoRemote::FetchViaTmpRepo(std::filesystem::path const& tmp_dir,
                                     anon_logger_ptr const& logger) noexcept
     -> bool {
     try {
+        auto tmp_dir = TmpDir::Create("fetch");
+        if (not tmp_dir) {
+            (*logger)("Failed to create temp dir for running 'git fetch'",
+                      /*fatal=*/true);
+            return false;
+        }
+        auto const& tmp_path = tmp_dir->GetPath();
         // check for internally supported protocols
         if (IsSupported(repo_url)) {
             // preferably with a "fake" repository!
@@ -542,7 +555,7 @@ auto GitRepoRemote::FetchViaTmpRepo(std::filesystem::path const& tmp_dir,
             // it can be bare, as the refspecs for this fetch will be given
             // explicitly.
             auto tmp_repo =
-                GitRepoRemote::InitAndOpen(tmp_dir, /*is_bare=*/true);
+                GitRepoRemote::InitAndOpen(tmp_path / "git", /*is_bare=*/true);
             if (tmp_repo == std::nullopt) {
                 return false;
             }
@@ -606,7 +619,7 @@ auto GitRepoRemote::FetchViaTmpRepo(std::filesystem::path const& tmp_dir,
         // run command
         SystemCommand system{repo_url};
         auto const command_output =
-            system.Execute(cmdline, env, GetGitPath(), tmp_dir);
+            system.Execute(cmdline, env, GetGitPath(), tmp_path);
 
         if (not command_output) {
             (*logger)(fmt::format("exec() on command failed."),