bin: add udev_match

Installed in the desktop profile.

1 files changed, 39 insertions, 0 deletions

diff --git a/bin/udev_match b/bin/udev_match
new file mode 100755
index 0000000..de51650
--- /dev/null
+++ b/bin/udev_match
@@ -0,0 +1,39 @@
+#!/usr/bin/python3
+
+import argparse
+import subprocess
+
+parser = argparse.ArgumentParser(description = 'Run a command on matching udev events')
+
+parser.add_argument('-s', '--subsystem')
+parser.add_argument('-m', '--match', action = 'append')
+
+parser.add_argument('command')
+
+args = parser.parse_args()
+
+def process_buf(buf):
+    for m in args.match:
+        if not m in buf:
+            return
+    subprocess.run(args.command, shell = True)
+
+cmdline = ['udevadm', 'monitor', '--property']
+if args.subsystem:
+    cmdline.append('--subsystem-match=' + args.subsystem)
+
+child = subprocess.Popen(cmdline, text = True, stdout = subprocess.PIPE)
+
+# skip first three lines
+[child.stdout.readline() for i in range(3)]
+
+buf = []
+
+while child.poll() is None:
+    line = child.stdout.readline().strip()
+    if not line:
+        process_buf(buf)
+        buf.clear()
+        continue
+
+    buf.append(line)