Dashboard: VM meters and sparklines, slackpkg tile

sbb-remote 0.3.0 adds CPU busy % (two /proc/stat samples), RAM total
and available, disk / total and free, and the last slackpkg update
(LASTUPDATE) and package change (/var/log/packages), replacing
disk_free. The Dashboard shows a VM card with meters for CPU, RAM and
disk / (accent, warning from 80%, critical from 90%, value always
printed) and CPU/RAM sparklines from this session's polls, and a
slackpkg tile in place of VM load.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 41 insertions, 3 deletions

diff --git a/remote/sbb-remote b/remote/sbb-remote
index b26fa9f..d82120a 100755
--- a/remote/sbb-remote
+++ b/remote/sbb-remote
@@ -38,7 +38,7 @@ import tempfile
 import time
 import tomllib
 
-VERSION = "0.2.0"
+VERSION = "0.3.0"
 DEFAULTS = {
     "state_dir": "/var/lib/sb-builder",
     "repo_dir": "/var/lib/sbopkg/SBo-danix",
@@ -358,12 +358,50 @@ def _uptime():
         return float(f.read().split()[0])
 
 
+def _cpu_times(path="/proc/stat"):
+    """(busy, total) jiffies over all CPUs; idle and iowait are not busy."""
+    with open(path) as f:
+        fields = [int(x) for x in f.readline().split()[1:]]
+    total = sum(fields[:8])  # guest time is already in user/nice
+    return total - fields[3] - fields[4], total
+
+
+def _cpu():
+    """Busy percent over a short sample."""
+    b1, t1 = _cpu_times()
+    time.sleep(0.25)
+    b2, t2 = _cpu_times()
+    return round(100 * (b2 - b1) / max(t2 - t1, 1), 1)
+
+
+def _meminfo(path="/proc/meminfo"):
+    with open(path) as f:
+        kb = {k: int(v.split()[0]) for k, v in (line.split(":", 1) for line in f)}
+    return {"total": kb["MemTotal"] * 1024, "available": kb["MemAvailable"] * 1024}
+
+
+def _slackpkg(lastupdate="/var/lib/slackpkg/LASTUPDATE", pkgdir="/var/log/packages"):
+    """Last 'slackpkg update' (its LASTUPDATE stamp) and last package change."""
+    def update():
+        with open(lastupdate) as f:
+            return int(f.read().split()[0])
+
+    def upgrade():
+        # ponytail: newest package entry; slackrepo INSTALL=n, so this is slackpkg's
+        with os.scandir(pkgdir) as it:
+            return int(max(e.stat().st_mtime for e in it))
+    return {"update": _try(update), "upgrade": _try(upgrade)}
+
+
 def cmd_stats(cfg):
-    dirs = {"repo": cfg["repo_dir"], "state": cfg["state_dir"]}
+    root = _try(lambda: shutil.disk_usage("/"))
     return {
         "load": _try(os.getloadavg),
         "uptime": _try(_uptime),
-        "disk_free": {k: _try(lambda p=p: shutil.disk_usage(p).free) for k, p in dirs.items()},
+        "cpu": _try(_cpu),
+        "mem": _try(_meminfo),
+        "disk": {"total": root and root.total, "free": root and root.free},
+        "slackpkg": _slackpkg(),
         "packages": _try(lambda: _packages(cfg)),
         "sync": {o: _try(lambda o=o: int(_git(cfg, "log", "-1", "--format=%ct", "--", o + "/")))
                  for o in cfg["overlays"]},