24 容器endpoint代码解读.txt

李宏达

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2022-10-08

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### e. **entrypoint.sh**

```s

[root@ecs-lee 3.0.1]# cat entrypoint.sh

#!/usr/bin/env bash

set -Eeo pipefail

# 幻术

# usage: file_env VAR [DEFAULT]

# ie: file_env 'XYZ_DB_PASSWORD' 'example'

# (will allow for "$XYZ_DB_PASSWORD_FILE" to fill in the value of

# "$XYZ_DB_PASSWORD" from a file, especially for Docker's secrets feature)

# 环境变量

export GAUSSHOME=/usr/local/mogdb

export PATH=$GAUSSHOME/bin:$PATH

export LD_LIBRARY_PATH=$GAUSSHOME/lib:$LD_LIBRARY_PATH

export LANG=en_US.UTF-8

# 文件环境变量

file_env() {

local var="$1"

local fileVar="${var}_FILE"

local def="${2:-}"

if [ "${!var:-}" ] && [ "${!fileVar:-}" ]; then

echo >&2 "error: both $var and $fileVar are set (but are exclusive)"

exit 1

local val="$def"

if [ "${!var:-}" ]; then

val="${!var}"

elif [ "${!fileVar:-}" ]; then

val="$(< "${!fileVar}")"

export "$var"="$val"

unset "$fileVar"

}

# check to see if this file is being run or sourced from another script

_is_sourced() {

[ "${#FUNCNAME[@]}" -ge 2 ] \

&& [ "${FUNCNAME[0]}" = '_is_sourced' ] \

&& [ "${FUNCNAME[1]}" = 'source' ]

}

# used to create initial mogdb directories and if run as root, ensure ownership

belong to the omm

user

# 创建相关目录

docker_create_db_directories() {

local user; user="$(id -u)"

mkdir -p "$PGDATA"

chmod 700 "$PGDATA"

# ignore failure since it will be fine when using the image provided

directory;

mkdir -p /var/run/mogdb || :

chmod 775 /var/run/mogdb || :

# Create the transaction log directory before initdb is run so the directory

is owned by

the correct user

if [ -n "$POSTGRES_INITDB_XLOGDIR" ]; then

mkdir -p "$POSTGRES_INITDB_XLOGDIR"

if [ "$user" = '0' ]; then

find "$POSTGRES_INITDB_XLOGDIR" \! -user postgres -exec chown

postgres '{

}' +

chmod 700 "$POSTGRES_INITDB_XLOGDIR"

# allow the container to be started with `--user`

if [ "$user" = '0' ]; then

find "$PGDATA" \! -user omm -exec chown omm '{}' +

find /var/run/mogdb \! -user omm -exec chown omm '{}' +

}

# initialize empty PGDATA directory with new database via 'initdb'

# arguments to `initdb` can be passed via POSTGRES_INITDB_ARGS or as arguments

to this function

# `initdb` automatically creates the "postgres", "template0", and "template1"

dbnames

# this is also where the database user is created, specified by `GS_USER` env

# 自定义变量，逻辑为若有传入则使用，没有则使用默认，其中包括

GS_NODENAME、ENCODING、LOCALE、DBCOMPATIBILITY

docker_init_database_dir() {

# "initdb" is particular about the current user existing in "/etc/passwd",

so we use "nss

_wrapper" to fake that if necessary

if ! getent passwd "$(id -u)" &> /dev/null && [ -e

/usr/lib/libnss_wrapper.so ]; then

export LD_PRELOAD='/usr/lib/libnss_wrapper.so'

export NSS_WRAPPER_PASSWD="$(mktemp)"

export NSS_WRAPPER_GROUP="$(mktemp)"

echo "postgres:x:$(id -u):$(id -g):PostgreSQL:$PGDATA:/bin/false" >

"$NSS_WRAPPER

_PASSWD"

echo "postgres:x:$(id -g):" > "$NSS_WRAPPER_GROUP"

if [ -n "$POSTGRES_INITDB_XLOGDIR" ]; then

set -- --xlogdir "$POSTGRES_INITDB_XLOGDIR" "$@"

cmdbase="gs_initdb --pwfile=<(echo "$GS_PASSWORD")"

if [ -n "$GS_NODENAME" ]; then

cmdbase="$cmdbase --nodename=$GS_NODENAME"

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