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alitoufighi/clone-ns.sh

Created September 26, 2020 09:32
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  1. alitoufighi created this gist Sep 26, 2020.
    90 changes: 90 additions & 0 deletions clone-ns.sh
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,90 @@
    #!/bin/bash

    help(){
    __usage=" SYNOPSIS
    ./make_namespace -n <new-namespace-name> -t <template-namespacce-name> [-b branch name]"
    echo "$__usage"
    }


    PARSED_OPTIONS=$(getopt -n "$0" -o ht:n:b: --long "help, template, branch, new-namespace" -- "$@")

    #Bad arguments, something has gone wrong with the getopt command.
    if [[ $? -ne 0 ]];
    then
    exit 1
    fi

    # CHANGEME
    required_resources=("services" "serviceaccount" "deployment" "configmap" "job")

    # A little magic, necessary when using getopt.
    eval set -- "${PARSED_OPTIONS}"
    new_namespace=
    template_namespace=
    branch_name=

    # Now goes through all the options with a case and using shift to analyse 1 argument at a time.
    #$1 identifies the first argument, and when we use shift we discard the first argument, so $2 becomes $1 and goes again through the case.
    while true;
    do
    case "$1" in
    -h|--help)
    help
    exit 0;
    shift;;
    -n|--new-namespace)
    if [[ -n "$2" ]]; then
    new_namespace=$2
    fi
    shift 2;;
    -b|--branch)
    if [[ -n "$2" ]]; then
    branch_name=$2
    fi
    shift 2;;
    -t|--template)
    if [[ -n "$2" ]]; then
    template_namespace=$2
    fi
    shift 2;;
    --)
    shift
    break;;
    esac
    done

    if [[ -z $new_namespace ]] || [[ -z $template_namespace ]]; then
    help
    exit 1;
    fi
    if [[ -z $branch_name ]]; then
    branch_name=$new_namespace
    fi

    #collect all yaml files from temlpate namespace and make some changes on them to use in new namespace
    for resource_type in ${required_resources[@]}; do
    resources=$(kubectl -n $template_namespace get $resource_type | awk '{print$1}')
    resources=(${resources#'NAME'})
    for current_resource in ${resources[@]}; do
    echo "preparing $resource_type/$current_resource..."
    current_resource_file=$current_resource.yaml
    kubectl -n $template_namespace get $resource_type/$current_resource -o yaml >> $current_resource_file
    yq w -i $current_resource_file metadata.namespace $new_namespace
    yq d -i $current_resource_file metadata.annotation
    if [ $resource_type == "job" ]; then
    yq d -i $current_resource_file spec.selector
    yq d -i $current_resource_file spec.template.metadata.labels
    job_image_path="spec.template.spec.containers.[0].image"
    job_image=$(yq r $current_resource_file "$job_image_path")
    new_job_image=${job_image/$template_namespace/$new_namespace}
    yq w -i $current_resource_file "$job_image_path" $new_job_image
    fi
    done
    done

    #make a new namespace with desired name
    kubectl create namespace $new_namespace

    #apply everything obtained from template namespace
    kubectl apply -n $new_namespace -f . -R