git repo fetch: support "inherit env"

When fetching git repositories, just-mr routinely shells out to
git. In this case, allow the user to specify via "inherit env",
which environment variables from the host environment should be
made available in this action. Typical variables to inherit are
ones providing credentials, like SSH_AUTH_SOCK. As the repository
description specifies the commit that will be taken, and hence the
resulting tree, correctness is not affected by the environement
leaking in here.

1 files changed, 17 insertions, 8 deletions

diff --git a/src/other_tools/ops_maps/git_update_map.hpp b/src/other_tools/ops_maps/git_update_map.hpp
index 1978069a..e1aac2e3 100644
--- a/src/other_tools/ops_maps/git_update_map.hpp
+++ b/src/other_tools/ops_maps/git_update_map.hpp
@@ -23,19 +23,28 @@
 #include "src/other_tools/git_operations/git_repo_remote.hpp"
 #include "src/utils/cpp/hash_combine.hpp"
 
-using StringPair = std::pair<std::string, std::string>;
+struct RepoDescriptionForUpdating {
+    std::string repo{};
+    std::string branch{};
+    std::vector<std::string> inherit_env{}; /*non-key!*/
+
+    [[nodiscard]] auto operator==(const RepoDescriptionForUpdating& other) const
+        -> bool {
+        return repo == other.repo and branch == other.branch;
+    }
+};
 
 /// \brief Maps a pair of repository url and branch to an updated commit hash.
-using GitUpdateMap = AsyncMapConsumer<StringPair, std::string>;
+using GitUpdateMap = AsyncMapConsumer<RepoDescriptionForUpdating, std::string>;
 
 namespace std {
 template <>
-struct hash<StringPair> {
-    [[nodiscard]] auto operator()(StringPair const& ct) const noexcept
-        -> std::size_t {
+struct hash<RepoDescriptionForUpdating> {
+    [[nodiscard]] auto operator()(
+        RepoDescriptionForUpdating const& ct) const noexcept -> std::size_t {
         size_t seed{};
-        hash_combine<std::string>(&seed, ct.first);
-        hash_combine<std::string>(&seed, ct.second);
+        hash_combine<std::string>(&seed, ct.repo);
+        hash_combine<std::string>(&seed, ct.branch);
         return seed;
     }
 };
@@ -46,4 +55,4 @@ struct hash<StringPair> {
                                       std::vector<std::string> const& launcher,
                                       std::size_t jobs) -> GitUpdateMap;
 
-#endif  // INCLUDED_SRC_OTHER_TOOLS_OPS_MAPS_GIT_UPDATE_MAP_HPP
\ No newline at end of file
+#endif  // INCLUDED_SRC_OTHER_TOOLS_OPS_MAPS_GIT_UPDATE_MAP_HPP