launcher: switch command quoting to shlex.quote

Minor fix, but just in case, provides properly quoted commands for
people to copy & paste.

Change-Id: Ia9fce5c0df9f51cbed9d49861adcf6821251e46f
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/466821
Tested-by: Mike Frysinger <vapier@google.com>
Commit-Queue: Mike Frysinger <vapier@google.com>
Reviewed-by: Gavin Mak <gavinmak@google.com>

release/util.py

@@ -16,6 +16,7 @@
 
 import os
 import re
+import shlex
 import subprocess
 import sys
 
@@ -35,12 +36,7 @@ KEYID_ECC = "E1F9040D7A3F6DAFAC897CD3D3B95DA243E48A39"
 
 def cmdstr(cmd):
     """Get a nicely quoted shell command."""
-    ret = []
-    for arg in cmd:
-        if not re.match(r"^[a-zA-Z0-9/_.=-]+$", arg):
-            arg = f'"{arg}"'
-        ret.append(arg)
-    return " ".join(ret)
+    return " ".join(shlex.quote(x) for x in cmd)
 
 
 def run(opts, cmd, check=True, **kwargs):

repo

@@ -57,9 +57,14 @@ class Trace:
 trace = Trace()
 
 
+def cmdstr(cmd):
+    """Get a nicely quoted shell command."""
+    return " ".join(shlex.quote(x) for x in cmd)
+
+
 def exec_command(cmd):
     """Execute |cmd| or return None on failure."""
-    trace.print(":", " ".join(cmd))
+    trace.print(":", cmdstr(cmd))
     try:
         if platform.system() == "Windows":
             ret = subprocess.call(cmd)
@@ -506,7 +511,7 @@ def run_command(cmd, **kwargs):
     # Run & package the results.
     proc = subprocess.Popen(cmd, **kwargs)
     (stdout, stderr) = proc.communicate(input=cmd_input)
-    dbg = ": " + " ".join(cmd)
+    dbg = ": " + cmdstr(cmd)
     if cmd_input is not None:
         dbg += " 0<|"
     if stdout == subprocess.PIPE:
@@ -843,7 +848,7 @@ def _GetRepoConfig(name):
         return None
     else:
         print(
-            f"repo: error: git {' '.join(cmd)} failed:\n{ret.stderr}",
+            f"repo: error: git {cmdstr(cmd)} failed:\n{ret.stderr}",
             file=sys.stderr,
         )
         # This will raise subprocess.CalledProcessError for us.