mirror of
https://github.com/EpicMorg/docker-scripts.git
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328 lines
11 KiB
Bash
Executable File
328 lines
11 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -Eeo pipefail
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# TODO swap to -Eeuo pipefail above (after handling all potentially-unset variables)
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# usage: file_env VAR [DEFAULT]
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# ie: file_env 'XYZ_DB_PASSWORD' 'example'
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# (will allow for "$XYZ_DB_PASSWORD_FILE" to fill in the value of
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# "$XYZ_DB_PASSWORD" from a file, especially for Docker's secrets feature)
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file_env() {
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local var="$1"
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local fileVar="${var}_FILE"
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local def="${2:-}"
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if [ "${!var:-}" ] && [ "${!fileVar:-}" ]; then
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echo >&2 "error: both $var and $fileVar are set (but are exclusive)"
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exit 1
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fi
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local val="$def"
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if [ "${!var:-}" ]; then
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val="${!var}"
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elif [ "${!fileVar:-}" ]; then
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val="$(< "${!fileVar}")"
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fi
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export "$var"="$val"
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unset "$fileVar"
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}
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# check to see if this file is being run or sourced from another script
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_is_sourced() {
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# https://unix.stackexchange.com/a/215279
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[ "${#FUNCNAME[@]}" -ge 2 ] \
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&& [ "${FUNCNAME[0]}" = '_is_sourced' ] \
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&& [ "${FUNCNAME[1]}" = 'source' ]
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}
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# used to create initial postgres directories and if run as root, ensure ownership to the "postgres" user
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docker_create_db_directories() {
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local user; user="$(id -u)"
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mkdir -p "$PGDATA"
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# ignore failure since there are cases where we can't chmod (and PostgreSQL might fail later anyhow - it's picky about permissions of this directory)
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chmod 700 "$PGDATA" || :
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# ignore failure since it will be fine when using the image provided directory; see also https://github.com/docker-library/postgres/pull/289
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mkdir -p /var/run/postgresql || :
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chmod 775 /var/run/postgresql || :
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# Create the transaction log directory before initdb is run so the directory is owned by the correct user
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if [ -n "$POSTGRES_INITDB_WALDIR" ]; then
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mkdir -p "$POSTGRES_INITDB_WALDIR"
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if [ "$user" = '0' ]; then
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find "$POSTGRES_INITDB_WALDIR" \! -user postgres -exec chown postgres '{}' +
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fi
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chmod 700 "$POSTGRES_INITDB_WALDIR"
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fi
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# allow the container to be started with `--user`
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if [ "$user" = '0' ]; then
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find "$PGDATA" \! -user postgres -exec chown postgres '{}' +
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find /var/run/postgresql \! -user postgres -exec chown postgres '{}' +
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fi
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}
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# initialize empty PGDATA directory with new database via 'initdb'
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# arguments to `initdb` can be passed via POSTGRES_INITDB_ARGS or as arguments to this function
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# `initdb` automatically creates the "postgres", "template0", and "template1" dbnames
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# this is also where the database user is created, specified by `POSTGRES_USER` env
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docker_init_database_dir() {
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# "initdb" is particular about the current user existing in "/etc/passwd", so we use "nss_wrapper" to fake that if necessary
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# see https://github.com/docker-library/postgres/pull/253, https://github.com/docker-library/postgres/issues/359, https://cwrap.org/nss_wrapper.html
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if ! getent passwd "$(id -u)" &> /dev/null && [ -e /usr/lib/libnss_wrapper.so ]; then
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export LD_PRELOAD='/usr/lib/libnss_wrapper.so'
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export NSS_WRAPPER_PASSWD="$(mktemp)"
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export NSS_WRAPPER_GROUP="$(mktemp)"
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echo "postgres:x:$(id -u):$(id -g):PostgreSQL:$PGDATA:/bin/false" > "$NSS_WRAPPER_PASSWD"
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echo "postgres:x:$(id -g):" > "$NSS_WRAPPER_GROUP"
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fi
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if [ -n "$POSTGRES_INITDB_WALDIR" ]; then
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set -- --waldir "$POSTGRES_INITDB_WALDIR" "$@"
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fi
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eval 'initdb --username="$POSTGRES_USER" --pwfile=<(echo "$POSTGRES_PASSWORD") '"$POSTGRES_INITDB_ARGS"' "$@"'
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# unset/cleanup "nss_wrapper" bits
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if [ "${LD_PRELOAD:-}" = '/usr/lib/libnss_wrapper.so' ]; then
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rm -f "$NSS_WRAPPER_PASSWD" "$NSS_WRAPPER_GROUP"
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unset LD_PRELOAD NSS_WRAPPER_PASSWD NSS_WRAPPER_GROUP
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fi
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}
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# print large warning if POSTGRES_PASSWORD is long
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# error if both POSTGRES_PASSWORD is empty and POSTGRES_HOST_AUTH_METHOD is not 'trust'
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# print large warning if POSTGRES_HOST_AUTH_METHOD is set to 'trust'
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# assumes database is not set up, ie: [ -z "$DATABASE_ALREADY_EXISTS" ]
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docker_verify_minimum_env() {
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# check password first so we can output the warning before postgres
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# messes it up
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if [ "${#POSTGRES_PASSWORD}" -ge 100 ]; then
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cat >&2 <<-'EOWARN'
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WARNING: The supplied POSTGRES_PASSWORD is 100+ characters.
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This will not work if used via PGPASSWORD with "psql".
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https://www.postgresql.org/message-id/flat/E1Rqxp2-0004Qt-PL%40wrigleys.postgresql.org (BUG #6412)
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https://github.com/docker-library/postgres/issues/507
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EOWARN
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fi
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if [ -z "$POSTGRES_PASSWORD" ] && [ 'trust' != "$POSTGRES_HOST_AUTH_METHOD" ]; then
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# The - option suppresses leading tabs but *not* spaces. :)
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cat >&2 <<-'EOE'
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Error: Database is uninitialized and superuser password is not specified.
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You must specify POSTGRES_PASSWORD to a non-empty value for the
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superuser. For example, "-e POSTGRES_PASSWORD=password" on "docker run".
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You may also use "POSTGRES_HOST_AUTH_METHOD=trust" to allow all
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connections without a password. This is *not* recommended.
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See PostgreSQL documentation about "trust":
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https://www.postgresql.org/docs/current/auth-trust.html
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EOE
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exit 1
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fi
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if [ 'trust' = "$POSTGRES_HOST_AUTH_METHOD" ]; then
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cat >&2 <<-'EOWARN'
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********************************************************************************
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WARNING: POSTGRES_HOST_AUTH_METHOD has been set to "trust". This will allow
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anyone with access to the Postgres port to access your database without
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a password, even if POSTGRES_PASSWORD is set. See PostgreSQL
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documentation about "trust":
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https://www.postgresql.org/docs/current/auth-trust.html
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In Docker's default configuration, this is effectively any other
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container on the same system.
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It is not recommended to use POSTGRES_HOST_AUTH_METHOD=trust. Replace
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it with "-e POSTGRES_PASSWORD=password" instead to set a password in
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"docker run".
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********************************************************************************
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EOWARN
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fi
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}
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# usage: docker_process_init_files [file [file [...]]]
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# ie: docker_process_init_files /always-initdb.d/*
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# process initializer files, based on file extensions and permissions
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docker_process_init_files() {
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# psql here for backwards compatibility "${psql[@]}"
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psql=( docker_process_sql )
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echo
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local f
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for f; do
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case "$f" in
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*.sh)
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# https://github.com/docker-library/postgres/issues/450#issuecomment-393167936
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# https://github.com/docker-library/postgres/pull/452
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if [ -x "$f" ]; then
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echo "$0: running $f"
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"$f"
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else
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echo "$0: sourcing $f"
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. "$f"
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fi
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;;
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*.sql) echo "$0: running $f"; docker_process_sql -f "$f"; echo ;;
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*.sql.gz) echo "$0: running $f"; gunzip -c "$f" | docker_process_sql; echo ;;
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*.sql.xz) echo "$0: running $f"; xzcat "$f" | docker_process_sql; echo ;;
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*) echo "$0: ignoring $f" ;;
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esac
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echo
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done
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}
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# Execute sql script, passed via stdin (or -f flag of pqsl)
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# usage: docker_process_sql [psql-cli-args]
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# ie: docker_process_sql --dbname=mydb <<<'INSERT ...'
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# ie: docker_process_sql -f my-file.sql
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# ie: docker_process_sql <my-file.sql
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docker_process_sql() {
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local query_runner=( psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --no-password )
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if [ -n "$POSTGRES_DB" ]; then
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query_runner+=( --dbname "$POSTGRES_DB" )
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fi
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PGHOST= PGHOSTADDR= "${query_runner[@]}" "$@"
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}
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# create initial database
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# uses environment variables for input: POSTGRES_DB
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docker_setup_db() {
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local dbAlreadyExists
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dbAlreadyExists="$(
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POSTGRES_DB= docker_process_sql --dbname postgres --set db="$POSTGRES_DB" --tuples-only <<-'EOSQL'
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SELECT 1 FROM pg_database WHERE datname = :'db' ;
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EOSQL
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)"
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if [ -z "$dbAlreadyExists" ]; then
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POSTGRES_DB= docker_process_sql --dbname postgres --set db="$POSTGRES_DB" <<-'EOSQL'
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CREATE DATABASE :"db" ;
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EOSQL
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echo
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fi
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}
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# Loads various settings that are used elsewhere in the script
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# This should be called before any other functions
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docker_setup_env() {
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file_env 'POSTGRES_PASSWORD'
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file_env 'POSTGRES_USER' 'postgres'
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file_env 'POSTGRES_DB' "$POSTGRES_USER"
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file_env 'POSTGRES_INITDB_ARGS'
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# default authentication method is md5
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: "${POSTGRES_HOST_AUTH_METHOD:=md5}"
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declare -g DATABASE_ALREADY_EXISTS
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# look specifically for PG_VERSION, as it is expected in the DB dir
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if [ -s "$PGDATA/PG_VERSION" ]; then
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DATABASE_ALREADY_EXISTS='true'
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fi
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}
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# append POSTGRES_HOST_AUTH_METHOD to pg_hba.conf for "host" connections
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pg_setup_hba_conf() {
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{
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echo
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if [ 'trust' = "$POSTGRES_HOST_AUTH_METHOD" ]; then
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echo '# warning trust is enabled for all connections'
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echo '# see https://www.postgresql.org/docs/12/auth-trust.html'
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fi
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echo "host all all all $POSTGRES_HOST_AUTH_METHOD"
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} >> "$PGDATA/pg_hba.conf"
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}
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# start socket-only postgresql server for setting up or running scripts
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# all arguments will be passed along as arguments to `postgres` (via pg_ctl)
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docker_temp_server_start() {
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if [ "$1" = 'postgres' ]; then
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shift
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fi
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# internal start of server in order to allow setup using psql client
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# does not listen on external TCP/IP and waits until start finishes
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set -- "$@" -c listen_addresses='' -p "${PGPORT:-5432}"
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PGUSER="${PGUSER:-$POSTGRES_USER}" \
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pg_ctl -D "$PGDATA" \
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-o "$(printf '%q ' "$@")" \
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-w start
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}
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# stop postgresql server after done setting up user and running scripts
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docker_temp_server_stop() {
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PGUSER="${PGUSER:-postgres}" \
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pg_ctl -D "$PGDATA" -m fast -w stop
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}
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# check arguments for an option that would cause postgres to stop
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# return true if there is one
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_pg_want_help() {
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local arg
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for arg; do
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case "$arg" in
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# postgres --help | grep 'then exit'
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# leaving out -C on purpose since it always fails and is unhelpful:
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# postgres: could not access the server configuration file "/var/lib/postgresql/data/postgresql.conf": No such file or directory
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-'?'|--help|--describe-config|-V|--version)
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return 0
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;;
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esac
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done
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return 1
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}
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_main() {
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# if first arg looks like a flag, assume we want to run postgres server
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if [ "${1:0:1}" = '-' ]; then
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set -- postgres "$@"
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fi
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if [ "$1" = 'postgres' ] && ! _pg_want_help "$@"; then
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docker_setup_env
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# setup data directories and permissions (when run as root)
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docker_create_db_directories
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if [ "$(id -u)" = '0' ]; then
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# then restart script as postgres user
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exec gosu postgres "$BASH_SOURCE" "$@"
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fi
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# only run initialization on an empty data directory
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if [ -z "$DATABASE_ALREADY_EXISTS" ]; then
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docker_verify_minimum_env
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# check dir permissions to reduce likelihood of half-initialized database
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ls /docker-entrypoint-initdb.d/ > /dev/null
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docker_init_database_dir
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pg_setup_hba_conf
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# PGPASSWORD is required for psql when authentication is required for 'local' connections via pg_hba.conf and is otherwise harmless
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# e.g. when '--auth=md5' or '--auth-local=md5' is used in POSTGRES_INITDB_ARGS
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export PGPASSWORD="${PGPASSWORD:-$POSTGRES_PASSWORD}"
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docker_temp_server_start "$@"
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docker_setup_db
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docker_process_init_files /docker-entrypoint-initdb.d/*
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docker_temp_server_stop
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unset PGPASSWORD
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echo
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echo 'PostgreSQL init process complete; ready for start up.'
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echo
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else
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echo
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echo 'PostgreSQL Database directory appears to contain a database; Skipping initialization'
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echo
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fi
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fi
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exec "$@"
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}
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if ! _is_sourced; then
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_main "$@"
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fi
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