18   def __init__(self, binary: Binary, platform: Platform):  argument
19     self.binary = binary
24     return (f"Could not find binary '{self.binary}' on {self.platform}. "
25             f"Please install {self.binary.name} or use the "
26             f"--bin-{self.binary.name} "
32   def __init__(self, binary: Binary, platform: Platform, expected: str):  argument
34     super().__init__(binary, platform)
37     return (f"Could not find binary '{self.binary}' on {self.platform}. "
44 class Binary:  class
45   """A binary abstraction for multiple platforms.
47   For platform-specific binaries use subclasses of Binary."""
66       raise ValueError("At least one platform binary must be provided")
75         raise ValueError("Got unexpected empty string as binary path")
84         raise ValueError(f"Windows binary {path} should have '.exe' suffix")
99     for binary in self.platform_path(platform):
100       binary_path = platform.path(binary)
130 class PosixBinary(Binary):
140 class MacOsBinary(Binary):
150 class LinuxBinary(Binary):
160 class AndroidBinary(Binary):
170 class WinBinary(Binary):
182   FFMPEG = Binary("ffmpeg", posix="ffmpeg")
183   GCERTSTATUS = Binary("gcertstatus", posix="gcertstatus")
184   GO = Binary("go", posix="go")
185   GSUTIL = Binary("gsutil", posix="gsutil")
187   MONTAGE = Binary("montage", posix="montage")
191   PYTHON3 = Binary("python3", default="python3", win="python3.exe")
200   FIREFOX_STABLE = Binary(
205   FIREFOX_DEV = Binary(
210   FIREFOX_NIGHTLY = Binary(