45 lines
1.4 KiB
Bash
Executable File
45 lines
1.4 KiB
Bash
Executable File
#!/bin/bash
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# Postgres backup/restore hook for the discourse `db` service.
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set -e
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BACKUP_FILE='/var/lib/postgresql/data/backup.sql'
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export PGPASSWORD=$(cat "${POSTGRES_PASSWORD_FILE:-/run/secrets/db_password}")
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DB_USER="${POSTGRES_USER:-discourse}"
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DB_NAME="${POSTGRES_DB:-discourse}"
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function backup {
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pg_dump -U "$DB_USER" "$DB_NAME" | gzip > "$BACKUP_FILE"
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}
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function restore {
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cd /var/lib/postgresql/data/
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# Block all non-local connections so the running discourse app + sidekiq cannot reconnect and
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# interfere with the drop/recreate/reimport. Restored on exit.
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restore_hba() {
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cat pg_hba.conf.bak > pg_hba.conf
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rm -f pg_hba.conf.bak
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su postgres -c 'pg_ctl reload'
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}
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cp pg_hba.conf pg_hba.conf.bak
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echo 'local all all trust' > pg_hba.conf
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su postgres -c 'pg_ctl reload'
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trap restore_hba EXIT INT TERM
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# terminate any lingering local sessions before recreate
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# see https://stackoverflow.com/questions/5108876/kill-a-postgresql-session-connection
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psql -U "$DB_USER" -d postgres -c \
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"SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE datname='${DB_NAME}' AND pid<>pg_backend_pid();"
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# drop database and then recreate it
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psql -U "$DB_USER" -d postgres -c "DROP DATABASE ${DB_NAME} WITH (FORCE);"
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createdb -U "$DB_USER" "$DB_NAME"
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# reimport data
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gunzip -c "$BACKUP_FILE" | psql -U "$DB_USER" -d "$DB_NAME" -1 -v ON_ERROR_STOP=1 -f -
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}
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$@
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