testsAndMisc/linux_configuration/periodic_background/hosts/lib/hosts_cache.sh
Krzysztof kuhy Rudnicki 4f2b0ccdf7 Dissolve linux_configuration/scripts/ and single_use/
Two levels of pure taxonomy carrying no information, and a 2-directory
cap leaves no room for them. Categories now sit directly under
linux_configuration/: features, fixes, utils, misc, fresh-install,
installers, diagnostics, gaming, boot_recovery, periodic_background, lib,
meta, tests. A script's own lib/ and tests/ are exempt from the cap, so
those stay put.

Depth violations 248 -> 139; roughly 40 of the remainder are inside
digital_wellbeing and hosts, deferred until the guard-lib repoint.

The moves are the easy half. What breaks is every path that counted
levels, and three classes of it had to be found by resolving paths rather
than reading diffs:

  - 52 relative `source` lines for lib/common.sh and lib/android.sh. The
    correct prefix differs per file: 40 were ../../ and 12 were ../../../,
    so a blanket replace would have fixed one set and broken the other.
  - REPO_ROOT in 7 fixes/lib/tests harnesses and setup_syncyomi_guard.sh,
    each walking up four levels from a directory now two levels shallower.
    This caused a real regression -- the fixes suite went red with
    "log_warn: command not found" -- caught by running it and comparing
    against the pre-move baseline worktree.
  - conftest.py's sys.path entries, which took the pytest gate down with
    14 collection errors, and the `# shellcheck source=` directives, which
    took shellcheck down with SC1091.

16 symlinks in $HOME broke, including the entire i3blocks bar. All
repointed, and cpu_monitor/memory/disk/time/volume were run to confirm
they emit real output rather than merely resolving.

Verified: 1798 tests pass at 100% coverage, 8 of 9 lib/tests suites pass
(the ninth needs the coverage jail, identically at baseline), pre-commit
is clean, and the two untracked secret configs are still ignored after
their gitignore paths changed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PJrqKERAo5QUeEHWS5Asgp
2026-08-23 18:53:30 +02:00

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#!/usr/bin/env bash
# lib/hosts_cache.sh — keep the local copy of the upstream StevenBlack list
# current.
#
# The cache holds the RAW upstream file, without our own entries, so a refresh
# never has to re-derive what we added. Sourced by install.sh.
# Helpers
extract_date_epoch_from_file() {
# Grep "# Date:" line and convert to epoch seconds (UTC)
local f="$1"
local line
line=$(grep -m1 '^# Date:' "$f" 2>/dev/null | sed -E 's/^# Date:[[:space:]]*(.*)[[:space:]]*\(UTC\).*/\1 UTC/')
if [[ -n $line ]]; then
date -u -d "$line" +%s 2>/dev/null || echo ""
else
echo ""
fi
}
fetch_remote_header() {
# Try to fetch only the first ~4KB using HTTP Range; fallback to piping to head
local out="$1"
if curl -LfsS --max-time 10 -H 'Range: bytes=0-4095' "$URL" -o "$out"; then
return 0
fi
# Fallback – may download more, but we only keep first lines
if curl -LfsS --max-time 10 "$URL" | head -n 20 >"$out"; then
return 0
fi
return 1
}
download_remote_full_to() {
local out="$1"
curl -LfsS "$URL" -o "$out"
}
# Decide whether the cached upstream blocklist is current, and re-download
# it if not. The cache holds the RAW upstream file, without our additions.
refresh_upstream_cache() {
# Decide whether to use cache or update
TMP_REMOTE_HEAD=$(mktemp)
trap 'rm -f "$TMP_REMOTE_HEAD"' EXIT
REMOTE_AVAILABLE=0
if fetch_remote_header "$TMP_REMOTE_HEAD"; then
REMOTE_AVAILABLE=1
fi
NEED_UPDATE=0
if [[ -f $LOCAL_CACHE ]]; then
local_epoch=$(extract_date_epoch_from_file "$LOCAL_CACHE")
else
local_epoch=""
fi
if [[ $REMOTE_AVAILABLE -eq 1 ]]; then
remote_epoch=$(extract_date_epoch_from_file "$TMP_REMOTE_HEAD")
if [[ -n $local_epoch && -n $remote_epoch && $local_epoch -ge $remote_epoch ]]; then
echo "Using cached StevenBlack hosts (up-to-date)."
else
echo "Cached version is missing or outdated; downloading latest StevenBlack hosts..."
NEED_UPDATE=1
fi
else
if [[ -f $LOCAL_CACHE ]]; then
echo "No internet; using cached StevenBlack hosts."
else
echo "Error: No internet and no cached StevenBlack hosts found." >&2
exit 1
fi
fi
# Ensure we have a fresh cache if needed
if [[ $NEED_UPDATE -eq 1 ]]; then
TMP_DL=$(mktemp)
if download_remote_full_to "$TMP_DL"; then
# Save raw upstream to cache
sudo mv "$TMP_DL" "$LOCAL_CACHE"
sudo chmod 644 "$LOCAL_CACHE"
echo "Saved latest StevenBlack hosts to cache: $LOCAL_CACHE"
else
rm -f "$TMP_DL"
echo "Error: Failed to download latest StevenBlack hosts." >&2
exit 1
fi
fi
}