Update docs.

diff --git a/exec_utils.py b/exec_utils.py
index 0bcfc2771741040e79ae69d7bb93b02d85abe251..51aaeb454ccfaeb2fe077303e54014bfec6cdfce 100644 (file)
--- a/exec_utils.py
+++ b/exec_utils.py
@@ -72,10 +72,9 @@ def cmd_showing_output(
 
 
 def cmd_exitcode(command: str, timeout_seconds: Optional[float] = None) -> int:
-    """Run a command but do not let it run for more than timeout_seconds.
-    This code doesn't capture or rebroadcast the command's output.  It
-    returns the exit value of the command or raises a TimeoutExpired
-    exception if the deadline is exceeded.
+    """Run a command silently and return its exit code once it has
+    finished.  If timeout_seconds is provided and the command runs too
+    long it will raise a TimeoutExpired exception.
 
     Args:
         command: the command to run
@@ -99,9 +98,9 @@ def cmd_exitcode(command: str, timeout_seconds: Optional[float] = None) -> int:
 
 
 def cmd(command: str, timeout_seconds: Optional[float] = None) -> str:
-    """Run a command and capture its output to stdout (only) into a string
-    buffer.  Return that string as this function's output.  Raises
-    subprocess.CalledProcessError or TimeoutExpired on error.
+    """Run a command and capture its output to stdout and stderr into a
+    string buffer.  Return that string as this function's output.
+    Raises subprocess.CalledProcessError or TimeoutExpired on error.
 
     Args:
         command: the command to run
@@ -133,7 +132,7 @@ def cmd(command: str, timeout_seconds: Optional[float] = None) -> str:
 
 def run_silently(command: str, timeout_seconds: Optional[float] = None) -> None:
     """Run a command silently but raise subprocess.CalledProcessError if
-    it fails.
+    it fails and raise a TimeoutExpired if it runs too long.
 
     Args:
         command: the command to run