persistent boot debug logs (#491)

* store debug logs

* lil more

* py

userspace/files/agnos-debug.service

@@ -0,0 +1,10 @@
+[Unit]
+After=local-fs.target
+
+[Service]
+Type=oneshot
+User=comma
+ExecStart=/usr/comma/debug.py
+
+[Install]
+WantedBy=multi-user.target

userspace/services.sh

@@ -10,6 +10,7 @@ systemctl enable cdsprpcd
 systemctl enable fs_setup.service
 systemctl enable serial-hostname.service
 systemctl enable comma.service
+systemctl enable agnos-debug.service
 systemctl enable gpio.service
 systemctl enable lte.service
 systemctl enable sound.service

userspace/usr/comma/debug.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+
+import os
+import shutil
+from pathlib import Path
+
+ROOT = Path("/cache/debug/")
+
+
+if __name__ == "__main__":
+  boots = sorted(list(ROOT.iterdir()), key=lambda p: int(p.stem, 16), reverse=True)
+
+  # limit to 100 boots
+  for d in boots[100:]:
+    print("cleaning up", d)
+    shutil.rmtree(d)
+
+  # make a directory for this boot
+  n = 0
+  if len(boots):
+    n = int(boots[0].stem, 16) + 1
+  boot_dir = ROOT / f"{n:08x}"
+  boot_dir.mkdir(parents=True)
+
+  # log some stuff
+  pstore = boot_dir / "pstore"
+  pstore.mkdir()
+  os.system(f"cp /sys/fs/pstore/* {pstore} 2>/dev/null")
+
+  os.system(f"uname -a > {boot_dir / 'uname'}")
+  shutil.copyfile("/VERSION", boot_dir / "VERSION")
+

userspace/usr/comma/fs_setup.sh

@@ -24,6 +24,9 @@ touch /data/etc/localtime
 mkdir -p /data/etc/netplan
 mkdir -p /data/etc/NetworkManager/system-connections
 
+# /cache
+chown -R comma:comma /cache/
+
 # /data/ssh
 mkdir -p /data/ssh
 chown comma: /data/ssh