Ansible double quotes and variables [duplicate] - mysql

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Ansible Command module says that '|' is illegal character
(2 answers)
Closed 4 years ago.
I'm trying implement a solution I've found on stackoverflow for truncating all tables in a database.
It works when I run it on terminal command line but unfortunately it does not work on Ansible.
Problematic part is this -e \"truncate table $table\" How should I handle a variable in double quote ? I couldn't found any solution so far.
- set_fact: db_truncate_command="mysql -v -h {{ wp_db_host }} -u {{ wp_db_user }} -p{{ wp_db_password }} -Nse 'show tables' {{ wp_db_name }} | while read table; do mysql -v -h {{ wp_db_host }} -u {{ wp_db_user }} -p{{ wp_db_password }} -e \"truncate table $table\" {{ wp_db_name }}; done"
when: stat_db_file.stat.exists
- debug:
msg: "command {{ db_truncate_command }} "
- name: Truncate existing tables in db
command: >
{{ db_truncate_command }}
when: stat_db_file.stat.exists
The output I get:
TASK [mysql : set_fact] ***********************************************************************************************************************************************************
ok: [ansible.mydomain.com] => {"ansible_facts": {"db_truncate_command": "mysql -v -h 192.155.190.255 -u wp_user -pMyPassword -Nse 'show tables' ansible | while read table; do mysql -v -h 192.155.190.255 -u wp_user -pMyPassword -e \"truncate table $table\" ansible; done"}, "changed": false}
TASK [mysql : debug] **************************************************************************************************************************************************************
ok: [ansible.mydomain.com] => {
"msg": "command mysql -v -h 192.155.190.255 -u wp_user -pMyPassword -Nse 'show tables' ansible | while read table; do mysql -v -h 192.155.190.255 -u wp_user -pMyPassword -e \"truncate table $table\" ansible; done "
}
TASK [mysql : Truncate existing tables in db] *************************************************************************************************************************************
fatal: [ansible.mydomain.com]: FAILED! => {"changed": true, "cmd": ["mysql", "-v", "-h", "192.155.190.255", "-u", "wp_user", "-pMyPassword", "-Nse", "show tables", "ansible", "|", "while", "read", "table;", "do", "mysql", "-v", "-h", "192.155.190.255", "-u", "wp_user", "-pMyPassword", "-e", "truncate table $table", "ansible;", "done"], "delta": "0:00:00.005262", "end": "2018-02-24 10:33:22.808490", "msg": "non-zero return code", "rc": 1, "start": "2018-02-24 10:33:22.803228", "stderr": "mysql: [Warning] Using a password on the command line interface can be insecure.", "stderr_lines": ["mysql: [Warning] Using a password on the command line interface can be insecure."], "stdout": "mysql Ver 14.14 Distrib 5.7.21, for Linux (x86_64) using EditLine wrapper\n
Added output of fail message

Answer 1

Using shell instead of command works.
- name: Truncate existing tables in db
shell: >
{{ db_truncate_command }}
when: stat_db_file.stat.exists