hostname to PS1 fix

hostname in PS1 cannot be set by the init signal as that occurs before /etc/profile, which overrides PS1

Also, clean up some code to not try to change PS1, but just change HOSTNAME

Added `hostname --update` to update $HOSTNAME by reading /etc/hostname again

src/main/resources/assets/opencomputers/loot/openos/bin/hostname.lua

@@ -1,22 +1,30 @@
-local args = {...}
+local shell = require("shell")
-if args[1] then
+local args, ops = shell.parse(...)
+local hostname = args[1]
+
+if hostname then
   local file, reason = io.open("/etc/hostname", "w")
   if not file then
     io.stderr:write("failed to open for writing: ", reason, "\n")
     return 1
-  else
-    file:write(args[1])
-    file:close()
-    os.setenv("HOSTNAME", args[1])
-    os.setenv("PS1", "$HOSTNAME:$PWD# ")
   end
+  file:write(hostname)
+  file:close()
+  ops.update = true
 else
   local file = io.open("/etc/hostname")
   if file then
-    io.write(file:read("*l"), "\n")
+    hostname = file:read("*l")
     file:close()
-  else
-    io.stderr:write("Hostname not set\n")
-    return 1
   end
 end
+
+if ops.update then
+  os.setenv("HOSTNAME_SEPARATOR", hostname and #hostname > 0 and ":" or "")
+  os.setenv("HOSTNAME", hostname)
+elseif hostname then
+  print(hostname)
+else
+  io.stderr:write("Hostname not set\n")
+  return 1
+end

src/main/resources/assets/opencomputers/loot/openos/boot/93_term.lua

@@ -32,6 +32,9 @@ local function components_changed(ename, address, type)
       -- recheck what kb to use
       window.keyboard = nil
     end
+    if (type == "screen" or type == "gpu") and not tty.isAvailable() then
+      computer.pushSignal("term_unavailable")
+    end
   elseif (ename == "component_added" or ename == "component_available") and type == "keyboard" then
   -- we need to clear the current terminals cached keyboard (if any) when
   -- a new keyboard becomes available. This is in case the new keyboard was
@@ -43,10 +46,6 @@ local function components_changed(ename, address, type)
   -- primary keyboard is a valid keyboard (weird, in my opinion)
     window.keyboard = nil
   end
-
-  if (type == "screen" or type == "gpu") and not tty.isAvailable() then
-    computer.pushSignal("term_unavailable")
-  end
 end
 
 event.listen("component_removed",     components_changed)

src/main/resources/assets/opencomputers/loot/openos/boot/94_shell.lua

@@ -1,10 +1,3 @@
-local shell = require("shell")
+-- there doesn't seem to be a reason to update $HOSTNAME after the init signal
-
+-- as user space /etc/profile comes after this point anyways
-require("event").listen("init", function()
+loadfile("/bin/hostname.lua")("--update")
-  local file = io.open("/etc/hostname")
-  if file then
-    os.setenv("HOSTNAME", file:read("*l"))
-    os.setenv("PS1", "$HOSTNAME:$PWD# ")
-    file:close()
-  end
-end)

src/main/resources/assets/opencomputers/loot/openos/etc/profile

@@ -16,7 +16,7 @@ set HOME=/home
 set IFS=\ 
 set MANPATH=/usr/man:.
 set PAGER=/bin/more
-set PS1='$PWD # '
+set PS1='$HOSTNAME$HOSTNAME_SEPARATOR$PWD # '
 set PWD=/
 set SHELL=/bin/sh
 set LS_COLORS="{FILE=0xFFFFFF,DIR=0x66CCFF,LINK=0xFFAA00,['*.lua']=0x00FF00}"

src/main/resources/assets/opencomputers/loot/openos/usr/man/hostname

@@ -2,7 +2,7 @@ NAME
   hostname - Display and modify hostname
 
 SYNOPIS
-  hostname [NEW NAME]
+  hostname [NEW NAME] [--update]
 
 EXAMPLES
   hostname
@@ -10,3 +10,6 @@ EXAMPLES
 
   hostname test
     Sets hostname of this computer to test
+
+  hostname --update
+    Updates $HOSTNAME by reading /etc/hostname in case it was set manually. Does not print to stdout