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Backup script resolves symlinks, aborts without DB

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Invoking via ./backup.sh symlink made dirname escape the repo and sqlite
created an empty DB in the parent dir. Now uses readlink -f with a
location check plus a guard that refuses to run without ./whaleprep.db.
This commit is contained in:
dev 2026-10-13 09:06:45 +05:30
parent 288ccef090
commit ba10e70830
1 changed files with 10 additions and 1 deletions
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11
deploy/termux-backup.sh
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@ -3,7 +3,16 @@
# Usage: ./deploy/termux-backup.sh (run from repo root; safe while live)
# Termux has no cron, so run this from Termux:Tasker, a daily alarm via
# Termux:API, or manually. One line, one snapshot.
cd "$(dirname "$0")/.."
# Resolve symlinks first: this script may be invoked as ./backup.sh (a
# symlink at repo root), in which case plain dirname would escape the repo
# and sqlite would create an empty DB in the wrong place.
HERE="$(dirname "$(readlink -f "$0")")"
if [ "$(basename "$HERE")" = "deploy" ]; then
cd "$HERE/.."
else
cd "$HERE"
fi
[ -f ./whaleprep.db ] || { echo "no ./whaleprep.db here ($(pwd)) — aborting"; exit 1; }
OUT="./backups/whaleprep-$(date +%F).db"
mkdir -p ./backups
# VACUUM INTO refuses to overwrite, so remove today's snapshot first —