How do I fix bash in gitlab ci :bad substitution

Question

package.json script block in file:

"scripts": {
  ...
  "test:schema": "./src/schemas/schema-test.sh"
}

.gitlab-ci.yml file contents:

image: node:12

stages:
  - lint
  - test
  # - build

.yarn_install:
  before_script:
    - yarn config set @private:registry https://npm.private.io
    - echo "//npm.private.io/:_authToken=${NPM_TOKEN}" > ~/.npmrc
    - yarn install
    - export PATH="./node_modules/.bin:${PATH}"

prettier:
  stage: lint
  script:
    - yarn config set @private:registry https://npm.private.io
    - echo "//npm.private.io/:_authToken=${NPM_TOKEN}" > ~/.npmrc
    - yarn add prettier
    - yarn lint

schema test:
  stage: test
  script:
    - yarn test:schema

variables:
  GIT_DEPTH: 10

schema-test.sh file contents:

#/usr/bin/env bash

# Test all file ends with schema.json via ajv

CURRENT_DIR=`dirname "$0"`

cd $CURRENT_DIR

for SCHEMA_FILE in *.schema.json
do
    SAMPLE_FILE=samples/${SCHEMA_FILE/schema/sample}
    echo Schema file: $SCHEMA_FILE
    if [ -f $SAMPLE_FILE ]
    then
        echo Found sample file: $SAMPLE_FILE
        npx ajv -s $SCHEMA_FILE -d $SAMPLE_FILE
    else
        echo "*NO* sample file found for $SCHEMA_FILE"
    fi
done

Gitlab CI error message:

...
51 $ export PATH="./node_modules/.bin:${PATH}"
52 $ yarn test:schema
53 yarn run v1.21.1
54 $ ./src/schemas/schema-test.sh
55 ./src/schemas/schema-test.sh: 11: ./src/schemas/schema-test.sh: Bad substitution
56 info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
57 error Command failed with exit code 2.
61 ERROR: Job failed: command terminated with exit code 1

• The CI error said there was a problem with line 11 of the schema-test.Sh file, but I didn't see the problem.

• They work well in a MacOS environment, and my guess is that CI's Docker image is Linux, causing some compatibility issues.

• Or is it just a matter of the ' / ' symbol not being Escape Code? I'm confused.

Thank you for all of your help!

==================================================

• According to @chepner said to make changes, but the test is still a problem

23 $ yarn test:schema
24 yarn run v1.21.1
25 $ ./src/schemas/schema-test.sh
26 Schema file: dev-assistant.schema.json
27 Found sample file: samples/dev-assistant.sample.json
28 npx: installed 6 in 1.124s
29 command not found: ajv
30 Schema file: form.schema.json
31 *NO* sample file found for form.schema.json
32 Schema file: news.schema.json
33 *NO* sample file found for news.schema.json
34 Schema file: repos.schema.json
35 Found sample file: samples/repos.sample.json
36 npx: installed 6 in 0.911s
37 command not found: ajv
38 Schema file: team-members.schema.json
39 Found sample file: samples/team-members.sample.json
40 npx: installed 6 in 0.902s
41 command not found: ajv
42 info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
43 error Command failed with exit code 1.
47 ERROR: Job failed: command terminated with exit code 1

Answer 1

Your script isn't executed with bash, so don't use bash-specific features. Assuming you want to change foo.schema.json to foo.sample.json, you can use instead

SAMPLE_FILE=samples/${SCHEMA_FILE%.schema.json}.sample.json

This removes .schema.json from the expansion of SCHEMA_FILE, then adds .sample.json back explicitly.