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#!/bin/bash
# Sample filesystem usage into a cache file, for widgets/disks.lua.
#
# This exists so the draw hook never calls statfs on an NFS path. An
# unreachable server blocks that call, and blocking the Cairo draw freezes the
# whole dashboard; here it costs a stale cache and nothing else.
#
# One NFS mount per server: Library and Slackware are the same export on one
# server, shared and backup_danix the same on another, so showing all four
# printed every number twice.
set -u
CACHE_DIR="${XDG_CACHE_HOME:-$HOME/.cache}/udt"
CACHE="$CACHE_DIR/disks.txt"
MOUNTS=(/ /home /data /mnt/nfs/Library /mnt/nfs/shared)
umask 077
mkdir -p "$CACHE_DIR"
TMP="$CACHE.tmp.$$"
trap 'rm -f "$TMP"' EXIT
# /usr/bin/df by absolute path with -P -B1, deliberately:
# - the user's shell aliases df to `df -h`, and an alias or a function would
# hand the parser '1.6G' where it expects an integer
# - -P is the POSIX format, one line per filesystem, mountpoint last
# - -B1 is bytes, so the widget does the formatting and the parser never
# has to interpret a suffix
if ! /usr/bin/df -P -B1 "${MOUNTS[@]}" > "$TMP" 2>/dev/null; then
# A single unreachable mount must not discard the others: df still reports
# the ones it could stat, so keep the output if it has any data rows.
if [ "$(wc -l < "$TMP")" -lt 2 ]; then
echo "disks-sample: df produced nothing usable" >&2
exit 1
fi
fi
mv -f "$TMP" "$CACHE"
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