daemon-interactive: show path on prompt

$ targetcli
targetcli shell version 2.1.51
Entering targetcli interactive mode for daemonized approach.
Type 'exit' to quit.

/> pwd
/
/> cd /iscsi
/iscsi> ls
o- iscsi .......................................... [Targets: 0]
/iscsi> exit

Signed-off-by: Prasanna Kumar Kalever <[email protected]>

Author: Prasanna Kumar Kalever

scripts/targetcli

@@ -122,7 +122,7 @@ def completer(text, state):
     except IndexError:
         return None
 
-def call_daemon(shell, req):
+def call_daemon(shell, req, interactive):
     try:
         sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
     except socket.error as err:
@@ -140,9 +140,23 @@ def call_daemon(shell, req):
                 "then run '#targetcli --disable-daemon'", 'red'))
         sys.exit(1)
 
+    # Two cases where we want to get pwd:
+    # 1. Before starting shell in interactive mode, needed for setting terminal
+    # 2. And only in Interactive mode, having command 'cd'
+    get_pwd = False
+    if interactive:
+        if not req:
+            req = "pwd"
+            get_pwd = True
+        elif "cd " in req:
+            req += "%pwd"
+            get_pwd = True
+    else:
+        req = "cd /%" + req # Non-interactive modes always consider start at '/'
+
     try:
         # send request
-        sock.sendall(req)
+        sock.sendall(req.encode())
     except socket.error as err:
         shell.con.display(shell.con.render_text(err, 'red'))
         sys.exit(1)
@@ -153,15 +167,30 @@ def call_daemon(shell, req):
     amount_received = 0
 
     # get the actual data in chunks
+    output = ""
+    path = ""
     while amount_received < amount_expected:
         data = sock.recv(1024)
         data = data.decode()
         amount_received += len(data)
-        print(data, end ="")
+        output += data
+
+    if get_pwd:
+        output_split = output.splitlines()
+        lines = len(output_split)
+        for i in range(0, lines):
+            if i == lines-1:
+                path = str(output_split[i])
+            else:
+                print(str(output_split[i]), end ="\n")
+    else:
+        print(output, end ="")
 
     sock.send(b'-END@OF@DATA-')
     sock.close()
 
+    return path
+
 def switch_to_daemon(shell, interactive):
     readline.set_completer(completer)
     readline.set_completer_delims('')
@@ -173,7 +202,7 @@ def switch_to_daemon(shell, interactive):
 
     if len(sys.argv) > 1:
         command = " ".join(sys.argv[1:])
-        call_daemon(shell, command.encode())
+        call_daemon(shell, command, False)
         sys.exit(0)
 
     if interactive:
@@ -188,10 +217,14 @@ def switch_to_daemon(shell, interactive):
                           "type 'exit' to run them all in one go.\n"
                           % targetcli_version)
 
+    prompt_path = "/"
+    if interactive:
+        prompt_path = call_daemon(shell, None, interactive) # get the initial path
+
     inputs = []
     real_exit=False
     while True:
-        shell.con.raw_write("/> ")
+        shell.con.raw_write("%s> " %prompt_path)
         pos = shell.con.get_cursor_xy()
         shell.con.set_cursor_xy(pos[0], pos[1])
         command = six.moves.input()
@@ -203,12 +236,17 @@ def switch_to_daemon(shell, interactive):
             inputs.append(command)
             if real_exit:
                 command = '%'.join(inputs)  # delimit multiple commands with '%'
-                call_daemon(shell, command.encode())
+                call_daemon(shell, command, interactive)
                 break
         else:
             if real_exit:
                 break
-            call_daemon(shell, command.encode())
+            path = call_daemon(shell, command, interactive)
+            if path:
+                if path[0] == "/":
+                    prompt_path = path
+                else:
+                    print(path)  # Error No Path ...
 
     sys.exit(0)