mirror of https://github.com/mpv-player/mpv
94 lines
3.2 KiB
Python
Executable File
94 lines
3.2 KiB
Python
Executable File
#!/usr/bin/env python
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"""
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This script emulates "unique application" functionality on Linux. When starting
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playback with this script, it will try to reuse an already running instance of
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mpv (but only if that was started with umpv). Other mpv instances (not started
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by umpv) are ignored, and the script doesn't know about them.
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This only takes filenames as arguments. Custom options can't be used; the script
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interprets them as filenames. If mpv is already running, the files passed to
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umpv are appended to mpv's internal playlist. If a file does not exist or is
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otherwise not playable, mpv will skip the playlist entry when attempting to
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play it (from the GUI perspective, it's silently ignored).
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If mpv isn't running yet, this script will start mpv and let it control the
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current terminal. It will not write output to stdout/stderr, because this
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will typically just fill ~/.xsession-errors with garbage.
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mpv will terminate if there are no more files to play, and running the umpv
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script after that will start a new mpv instance.
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Note that you can control the mpv instance by writing to the command fifo:
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echo "cycle fullscreen" > /tmp/umpv-fifo-*
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Warning:
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The script attempts to make sure the FIFO is safely created (i.e. not world-
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writable), and checks that it's really a FIFO. This is important for security,
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because the FIFO allows anyone with write access to run arbitrary commands
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in mpv's context using the "run" input command. If you are worried about
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security, you should verify that the code handles these concerns correctly.
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"""
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import sys
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import os
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import errno
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import subprocess
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import fcntl
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import stat
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if len(sys.argv) < 2:
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print("error: needs at least one file as argument.")
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sys.exit(1)
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files = sys.argv[1:]
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# make them absolute; also makes them safe against interpretation as options
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files = [os.path.abspath(f) for f in files]
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FIFO = "/tmp/umpv-fifo-" + os.getenv("USER")
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fifo_fd = -1
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try:
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fifo_fd = os.open(FIFO, os.O_NONBLOCK | os.O_WRONLY)
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except OSError as e:
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if e.errno == errno.ENXIO:
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pass # pipe has no writer
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elif e.errno == errno.ENOENT:
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pass # doesn't exist
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else:
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raise e
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if fifo_fd >= 0:
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st = os.fstat(fifo_fd)
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if (((st.st_mode & (stat.S_IRWXG | stat.S_IRWXO)) != 0) or
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(not stat.S_ISFIFO(st.st_mode)) or
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(st.st_uid != os.getuid())):
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print("error: command FIFO is not a FIFO or has bogus permissions")
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sys.exit(1)
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if fifo_fd >= 0:
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# Unhandled race condition: what if mpv is terminating right now?
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fcntl.fcntl(fifo_fd, fcntl.F_SETFL, 0) # set blocking mode
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fifo = os.fdopen(fifo_fd, "w")
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for f in files:
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# escape: \ \n "
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f = f.replace("\\", "\\\\").replace("\"", "\\\"").replace("\n", "\\n")
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f = "\"" + f + "\""
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fifo.write("raw loadfile " + f + " append\n")
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else:
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# Recreate pipe if it doesn't already exist.
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# Also makes sure it's safe, and no other user can create a bogus pipe
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# that breaks security.
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try:
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os.unlink(FIFO)
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except OSError as e:
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if e.errno == errno.ENOENT:
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pass
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else:
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raise e
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os.mkfifo(FIFO, int("0600", 8))
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subprocess.check_call(["mpv", "--really-quiet", "--force-window",
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"--input-file=" + FIFO, "--"] + files)
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