From acc8625c563a3b05b1cbfdbc94d39870c7a71b42 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Anton=20Luka=20=C5=A0ijanec?= <anton@sijanec.eu>
Date: Wed, 29 Nov 2023 11:05:18 +0100
Subject: jelka

---
 prog/jelka/wrapper.py | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100755 prog/jelka/wrapper.py

(limited to 'prog/jelka/wrapper.py')

diff --git a/prog/jelka/wrapper.py b/prog/jelka/wrapper.py
new file mode 100755
index 0000000..ad2f11d
--- /dev/null
+++ b/prog/jelka/wrapper.py
@@ -0,0 +1,60 @@
+#!/usr/bin/python3
+import io
+import os
+import pwd
+import subprocess
+import psutil
+import mmap
+import time
+import resource
+from jelka_config import luči
+from sys import argv
+if not os.getenv("DRY_RUN"):
+	import jelka_hardware
+
+def izriši():
+	if os.getenv("DRY_RUN"):
+		print("wrapper: ", end="")
+		for i in range(luči*3):
+			print(f"{buffer[i]:02x}", end="")
+		print()
+		return
+	for i in range(luči):
+		jelka_hardware.nastavi(i, (buffer[3*i], buffer[3*i+1], buffer[3*i+2]))
+	jelka_hardware.izriši()
+
+def demote(uid, gid, chrootpath):
+	def result():
+		resource.setrlimit(resource.RLIMIT_NPROC, (1, 1))
+		os.chroot(chrootpath)
+		os.setgid(gid)
+		os.setuid(uid)
+	return result
+
+shmf = open("chroot/dev/shm/jelka", mode="w+b")
+os.ftruncate(shmf.fileno(), luči*3)
+buffer = mmap.mmap(shmf.fileno(), 0)
+cwd = "/"
+r, w = os.pipe()
+args = ["/jelka/vzorci/" + argv[1], str(w)]
+pw_record = pwd.getpwnam("z")
+os.chown("chroot/dev/shm/jelka", 0, pw_record.pw_gid)
+os.chmod("chroot/dev/shm/jelka", 0o660)
+env = os.environ.copy()
+env["HOME"] = pw_record.pw_dir
+env["LOGNAME"] = pw_record.pw_name
+env["PWD"] = cwd
+env["USER"] = pw_record.pw_name
+env["PYTHONPATH"] = "/jelka"
+process = subprocess.Popen(
+	args, preexec_fn=demote(pw_record.pw_uid, pw_record.pw_uid, os.path.abspath("chroot")), cwd=cwd, env=env, pass_fds=[w]
+)
+try:
+	while io.FileIO(r, closefd=False).read(1):
+		izriši()
+	result = process.wait()
+	buffer.close()
+	shmf.close()
+except:
+	print("cleaning up!")
+	process.kill()
-- 
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