Hack to enable plotting without sequence (do not merge)

.github/workflows/cmake.yml

@@ -131,6 +131,7 @@ jobs:
 
       - name: Install MAD-X build dependencies
         run: |
+          sudo apt-get update
           sudo apt-get install -qy \
             libblas-dev \
             liblapack-dev \

.github/workflows/make.yml

@@ -41,6 +41,7 @@ jobs:
       - name: Install dependencies
         run: |
           set -ex
+          sudo apt-get update
           sudo apt-get install -qy \
             libblas-dev \
             liblapack-dev \

.github/workflows/manylinux.yml

@@ -87,7 +87,9 @@ jobs:
           ln -sf bin/numdiff$ARCH .
 
       - name: Install runtime dependencies
-        run: sudo apt-get install -qy gnuplot
+        run: |
+          sudo apt-get update \
+          sudo apt-get install -qy gnuplot
 
       - name: Run tests
         # Skip 32bit build - it's broken and mind-boggelingly slow (>>2h)!

doc/latexuguide/thintrack.tex

@@ -265,6 +265,8 @@ \section{TRACK}
 
   \ttitem{UPDATE} flag to trigger parameter update per turn. \\  
   (Default:~false) \\
+  \textbf{Note} that \ttitem{tr\$macro} needs to be defined even if only the access
+  to the turn number \texttt{tr\$turni} is used.
   Specifying \texttt{UPDATE=true} gives access to the following additions:   
   \begin{madlist}
     \ttitem{tr\$turni} this special variable contains the turn number;

src/mad_elem.c

@@ -187,7 +187,7 @@ enter_elm_reference(struct in_cmd* cmd, struct element* el, int flag, int isupda
     current_node->from_name = permbuff(from);
     nupdates = 2;
   }
-    if (isupdating==0) check_for_update_in_seq(el, cmd->clone, nupdates);
+  if (isupdating==0) check_for_update_in_seq(el, cmd->clone, nupdates);
 }
 
 static int

src/mad_plot.c

@@ -133,6 +133,7 @@ exec_plot(struct in_cmd* cmd)
   struct table* p_table = NULL;
   const char *table_name = NULL, *file_name = NULL;
   char *last_twiss_table, *trackfile;
+  struct command* tmp_command;
   char track_file_name[NAME_L], ps_file_name[NAME_L];
   char plot_title[TITLE_SIZE], version[TITLE_SIZE];
   FILE *gpu;
@@ -142,7 +143,13 @@ exec_plot(struct in_cmd* cmd)
 
   /* use correct beam for sequence to be plotted - HG 031127 */
   struct command* keep_beam = current_beam;
-  if (attach_beam(current_sequ) == 0)
+  tmp_command = clone_command(this_cmd->clone);
+  if (attach_beam(current_sequ) == 0){
+    char mychar [100] = "resbeam; neverusedsequencename632:sequence, l=10; q1:quadrupole, at=1; endsequence;";
+    pro_input(mychar);
+    this_cmd->clone = clone_command(tmp_command);
+  }
+    if (attach_beam(current_sequ) == 0)      
     fatal_error("PLOT - sequence without beam:", current_sequ->name);
   /* end part1 of HG 031127 */