Report writability of file systems

clients/report_rw

@@ -0,0 +1,86 @@
+#!/usr/bin/python3
+
+import hmac
+import json
+import os
+import pprint
+import random
+import socket
+import subprocess
+import time
+
+import requests
+
+
+# Use a whitelist since there are a lot of uninteresting file system
+# types on modern linux systems
+interesting_fstypes = {"ext4", "tmpfs", "vfat"}
+
+# It's a bit weird that this works.
+hostname = socket.gethostbyaddr(socket.gethostname())[0]
+
+
+now = time.time()
+
+report = []
+with open("/proc/mounts") as mfh:
+    for ln in mfh:
+        (dev, mountpoint, fstype, options, _, _) = ln.split()
+        if fstype not in interesting_fstypes:
+            continue
+
+        try:
+            with open(mountpoint + "/.writable", "w") as fh:
+                fh.write("w")
+            writable = 1
+        except PermissionError as e:
+            # Pilot error
+            writable = 0
+        except OSError as e:
+            # Check for e.errno == 30?
+            # Nope, any error means that we can't write.
+            writable = 0
+
+        report.append(
+            {
+                "description": {
+                    "hostname": hostname,
+                    "mountpoint": mountpoint,
+                    "measure": "writable",
+                    "unit": "bool",
+                },
+                "data": [
+                    [now, writable]
+                ]
+            }
+        )
+
+for dir in (".", os.environ["HOME"] + "/.config/ltsdb", "/etc/ltsdb"):
+    try:
+        with open(dir + "/config.json") as fh:
+            client_config = json.load(fh)
+        baseurl = client_config["server"]
+        break
+    except FileNotFoundError:
+        pass
+while True:
+    for r in report:
+        node = hostname
+        timestamp = time.time()
+        msg = (node + " " + str(timestamp)).encode("UTF-8")
+        digest = hmac.new(client_config["key"].encode("UTF-8"), msg, "SHA256").hexdigest()
+        r["auth"] = {
+            "node": node,
+            "timestamp": timestamp,
+            "hmac": digest,
+        }
+    #pprint.pp(report)
+    r = requests.post(baseurl + "report", json=report)
+    print(r)
+    if r.status_code == 200:
+        exit(0)
+    elif r.status_code == 409:
+        time.sleep(0.5 + random.random())
+        continue
+    else:
+        exit(1)