Syntax check for bash script, with error code as exit code for the sake of SSH?

przemo_li

1/17/23, 7:22 AM

I want to automate some deployment steps. Have CD server, it runs on Linux (in bash). Project is then configured to run bash script on actual app server to perform deployment. SSH is used to connect from CD runner to actual server.

Whole setup relies on an assumption that failing deployment is signaled by appropriate non zero exit code.

Want to add extra safety, so that syntax errors stop/fail deployment early. However, Bash by default do not adhere to convention of exit codes for syntax errors in script. O_O

Unfortunately "/bin/sh -n ..." will NOT return non-zero on syntax error.
Second technique tried, " $(/bin/sh -n ...) | wc -c | ... ", fails because it can not find the script file. I'm baffled by that error. Its the same file/the same command as in first technique.

Setup details:

CD runner running Linux & bash
app server running Windows & OpenSSH & bash
since those two are different bash installations, validation have to happen in app server bash - so over SSH

Question: Did I missed any option/flag/env variable that will instruct Bash to use non-zero exit code for syntax errors?
Or: Why would surrounding working /bin/sh invocation with $() make it fail?

0 + 0

ssh

bash

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Syntax check for bash script, with error code as exit code for the sake of SSH?

TH: ตรวจสอบไวยากรณ์สำหรับสคริปต์ทุบตีโดยมีรหัสข้อผิดพลาดเป็นรหัสทางออกเพื่อประโยชน์ของ SSH หรือไม่

RO: Verificare de sintaxă pentru scriptul bash, cu cod de eroare ca cod de ieșire de dragul SSH?

RU: Проверка синтаксиса для сценария bash с кодом ошибки в качестве кода выхода для SSH?

VI: Kiểm tra cú pháp cho tập lệnh bash, với mã lỗi là mã thoát vì lợi ích của SSH?

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