a5a3b36755
- pg_backup.sh: use the db service's POSTGRES_USER (default postgres) for the dump/drop/recreate instead of detecting the superuser at runtime, since the recipe now sets that env var; one-line the constants comment - release note: explain the in-place pg_upgrade + the POSTGRES_USER override - bump PG_BACKUP_VERSION v4 Verified on cctest: backup + restore via the hooks round-trips with POSTGRES_USER.
48 lines
1.5 KiB
Bash
Executable File
48 lines
1.5 KiB
Bash
Executable File
#!/bin/bash
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# Postgres backup/restore hook for the discourse `db` service (discourse/postgres image).
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set -e
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# dump goes at the volume root so backupbot's backup.sql label finds it
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BACKUP_FILE='/var/lib/postgresql/backup.sql'
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DATADIR="${PGDATA:-/var/lib/postgresql/18/docker}"
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DB_NAME="${POSTGRES_DB:-discourse}"
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# bootstrap superuser for the dump/drop/recreate; same POSTGRES_USER the db service sets
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SU="${POSTGRES_USER:-postgres}"
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function backup {
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pg_dump -U "$SU" "$DB_NAME" | gzip > "$BACKUP_FILE"
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}
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function restore {
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cd "$DATADIR"
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# Block all non-local connections so the running discourse app + sidekiq cannot reconnect and
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# interfere with the drop/recreate/reimport. Restored on exit.
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restore_hba() {
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cat pg_hba.conf.bak > pg_hba.conf
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rm -f pg_hba.conf.bak
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su postgres -c "pg_ctl -D '$DATADIR' reload"
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}
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cp pg_hba.conf pg_hba.conf.bak
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echo 'local all all trust' > pg_hba.conf
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su postgres -c "pg_ctl -D '$DATADIR' reload"
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trap restore_hba EXIT INT TERM
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# terminate any lingering local sessions before recreate
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# see https://stackoverflow.com/questions/5108876/kill-a-postgresql-session-connection
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psql -U "$SU" -d postgres -c \
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"SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE datname='${DB_NAME}' AND pid<>pg_backend_pid();"
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# drop database and then recreate it
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psql -U "$SU" -d postgres -c "DROP DATABASE ${DB_NAME} WITH (FORCE);"
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createdb -U "$SU" "$DB_NAME"
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# reimport data
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gunzip -c "$BACKUP_FILE" | psql -U "$SU" -d "$DB_NAME" -1 -v ON_ERROR_STOP=1 -f -
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}
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$@
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