96 lines
3.1 KiB
Bash
96 lines
3.1 KiB
Bash
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#!/bin/bash
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set -o errexit
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set -o nounset
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# This script will upgrade Postgres to the "current" version of Postgres, if needed.
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# Assumptions:
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# 1. Postgres is currently not running. The caller of this script ensures that _no_ version of Postgres server is currently running.
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# 2. The newest version of Postgres we want to use, is already installed.
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# 3. Postgres is installed via apt package manager only.
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# Contract:
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# 1. Don't install old version of Postgres, if it's already installed.
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# 2. Use absolute paths to all Postgres executables, don't rely on any of them to be coming from "\$PATH".
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# 3. Be idempotent across versions.
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# 4. When we can't proceed due to any exceptional scenarios, communicate clearly.
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# 5. Mark old/stale/deprecated data with a date, so it can be deleted with confidence later.
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# Check if any Postgres server is running
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if pgrep -x "postgres" > /dev/null; then
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echo "Error: A Postgres server is currently running. Please stop it before proceeding with the upgrade."
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exit 1
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fi
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postgres_path=/usr/lib/postgresql
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pg_data_dir=/appsmith-stacks/data/postgres/main
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old_version=""
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if [[ -f "$pg_data_dir/PG_VERSION" ]]; then
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old_version="$(cat "$pg_data_dir/PG_VERSION")"
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fi
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if [[ -z "$old_version" ]]; then
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tlog "No existing Postgres data found, not upgrading anything." >&2
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exit
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fi
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if [[ -f "$pg_data_dir/postmaster.pid" ]]; then
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tlog "Previous Postgres was not shutdown cleanly. Please start and stop Postgres $old_version properly with 'supervisorctl' only." >&2
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exit 1
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fi
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top_available_version="$(postgres --version | grep -o '[[:digit:]]\+' | head -1)"
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declare -a to_uninstall
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to_uninstall=()
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# 13 to 14
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if [[ "$old_version" == 13 && "$top_available_version" > "$old_version" ]]; then
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if [[ ! -e "$postgres_path/$old_version" ]]; then
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apt-get update
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apt-get install --yes "postgresql-$old_version"
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to_uninstall+=("postgresql-$old_version")
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fi
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new_version="$((old_version + 1))"
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new_data_dir="$pg_data_dir-$new_version"
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# `pg_upgrade` writes log to current folder. So change to a temp folder first.
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rm -rf "$TMP/pg_upgrade" "$new_data_dir"
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mkdir -p "$TMP/pg_upgrade" "$new_data_dir"
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chown -R postgres "$TMP/pg_upgrade" "$new_data_dir"
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cd "$TMP/pg_upgrade"
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# Required by the temporary Postgres server started by `pg_upgrade`.
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chown postgres /etc/ssl/private/ssl-cert-snakeoil.key
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chmod 0600 /etc/ssl/private/ssl-cert-snakeoil.key
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su postgres --command "
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set -o errexit
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set -o xtrace
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'$postgres_path/$new_version/bin/initdb' --pgdata='$new_data_dir'
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'$postgres_path/$new_version/bin/pg_upgrade' \
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--old-datadir='$pg_data_dir' \
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--new-datadir='$new_data_dir' \
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--old-bindir='$postgres_path/$old_version/bin' \
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--new-bindir='$postgres_path/$new_version/bin'
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"
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date -u '+%FT%T.%3NZ' > "$pg_data_dir/deprecated-on.txt"
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mv -v "$pg_data_dir" "$pg_data_dir-$old_version"
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mv -v "$new_data_dir" "$pg_data_dir"
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# Dangerous generated script that deletes the now updated data folder.
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rm -fv "$TMP/pg_upgrade/delete_old_cluster.sh"
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fi
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if [[ -n "${#to_uninstall[@]}" ]]; then
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apt-get purge "${to_uninstall[@]}"
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apt-get clean
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fi
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echo "== Fin =="
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