libutil: remove unused RunOptions::{chdir, createSession}

Change-Id: Ib2b9f5c094233661a01ad8cea30a44e11931c941

lix/libutil/processes.cc

@@ -350,9 +350,6 @@ RunningProgram runProgram2(const RunOptions & options)
     /* Fork. */
     Pid pid{startProcess(
         [&]() {
-            if (options.createSession && setsid() == -1) {
-                throw SysError("setsid");
-            }
             if (options.environment) {
                 replaceEnv(*options.environment);
             }
@@ -371,10 +368,6 @@ RunningProgram runProgram2(const RunOptions & options)
                 }
             }
 
-            if (options.chdir && sys::chdir(*options.chdir) == -1) {
-                throw SysError("chdir failed");
-            }
-
 #if __linux__
             if (!options.caps.empty() && prctl(PR_SET_KEEPCAPS, 1) < 0) {
                 throw SysError("setting keep-caps failed");

lix/libutil/processes.hh

@@ -109,10 +109,8 @@ struct RunOptions
     Strings args = {};
     std::optional<uid_t> uid = {};
     std::optional<uid_t> gid = {};
-    std::optional<Path> chdir = {};
     std::optional<std::map<std::string, std::string>> environment = {};
     bool captureStdout = false;
-    bool createSession = false;
     std::vector<Redirection> redirections;
 #if __linux__
     std::set<long> caps;