How do I fix bash in gitlab ci :bad substitution - linux

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.