Why sqlcmd not found during docker-compose up build?

Question

I try to create a docker container of mssql database that is filled up with data when I start it.

I would like to start the database by using the command docker-compose up --build

docker.yml
version: '3.7'

networks:
  sqlserver:
    ipam:
     config:
       - subnet: 172.20.0.0/24

services:

  mssql:
    container_name: "mssql"
    build:
      context: ./
      dockerfile: Dockerfile

    networks:
      sqlserver:
        ipv4_address: 172.20.0.5

    environment:
      SA_PASSWORD: "VerySecretP4ssword!"
      ACCEPT_EULA: "Y"

    ports:
      - "1433:1433"

FROM mcr.microsoft.com/mssql/server:latest
RUN mkdir -p /var/opt/mssql/backup

COPY backup.bak /var/opt/mssql/backup
COPY restoreScript.sql /var/opt/mssql/backup

RUN sqlcmd -i /var/opt/mssql/backup/restoreScript.sql

And after i ran the above mentioned command i get

/bin/sh: 1: sqlcmd: not found
ERROR: Service 'mssql' failed to build: The command '/bin/sh -c sqlcmd -i /var/opt/mssql/backup/restoreScript.sql' returned a non-zero code: 127

Answer 1

The return code says, that the command sqlcmd was not found in the PATH of your container. In the documentation https://hub.docker.com/_/microsoft-mssql-server you can see that sqlcmd is in /opt/mssql-tools/bin/ so modify your RUN command to use the full path.