wip: custom environment variable passing

You should be able to tell your sci deployment which env vars should be
passed to the pipelines with -e ENV1 -e ENV2 and so on

include/cli.h

@@ -29,6 +29,7 @@ typedef struct {
     bool use_colors;
     optional_str log_file;
     optional_str pipeline_log_dir;
+    optional_strlist environment_vars;
 } cli_options;
 
 // Construct a new cli_options struct instance.

include/optional.h

@@ -17,6 +17,7 @@
  */
 #ifndef SCI_OPTIONAL_H
 #define SCI_OPTIONAL_H
+#include "strlist.h"
 #include <stdbool.h>
 
 #define optional_type(type) struct { bool has_value; type value; }
@@ -24,5 +25,6 @@ typedef optional_type(int) optional_int;
 typedef optional_type(float) optional_float;
 typedef optional_type(char*) optional_str;
 typedef optional_type(const char*) optional_cstr;
+typedef optional_type(strlist_node*) optional_strlist;
 
 #endif

include/strlist.h

@@ -0,0 +1,51 @@
+/**
+ * sci - a simple ci system
+   Copyright (C) 2024 Asger Gitz-Johansen
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+#ifndef SCI_STRLIST_H
+#define SCI_STRLIST_H
+
+// doubly linked list
+typedef struct strlist_node {
+    char* str;
+    struct strlist_node* previous;
+    struct strlist_node* next;
+} strlist_node;
+
+// Create a new root node.
+// This function is not threadsafe.
+strlist_node* create_strlist_node(char* str);
+
+// Add a new string to the string list.
+// This function is not threadsafe.
+strlist_node* add_str(char* str, strlist_node* root);
+
+// add a new string list node to the list.
+// This function is not threadsafe.
+strlist_node* add_str_node(strlist_node* str_node, strlist_node* root);
+
+// Remove a string list node from the list.
+// This will free the str and stitch the "previous" and "next" ptrs.
+// This function is not threadsafe.
+void remove_strlist_node(strlist_node* node);
+
+// Completely clear the list.
+// The list is completely invalid after this call and should be discarded.
+// root itself will not be free'd by this function, but all content will be.
+// This function is not threadsafe.
+void clear_strlist(strlist_node* root);
+
+#endif

include/threadlist.h

@@ -42,9 +42,8 @@ void remove_thread_node(pthread_list_node* node);
 // Completely clear the thread list.
 // This will call pthread_join on all nodes.
 // The list is completely invalid after this call and should be discarded.
-// Note:
-//  - `root` has already been free'd.
-//  - this function is not thread-safe.
+// Even root itself will be free'd by this function so it should be discarded as well.
+// This function is not thread-safe.
 void clear_thread_list(pthread_list_node* root);
 
 #endif