if $VERBOSE; then log_info "Running: $GCLOUD_CMD" set -x fi if $GCLOUD_CMD; then log_info "✓ Authentication successful"
# Display current configuration if $VERBOSE; then echo "" log_info "Current configuration:" gcloud config list echo "" log_info "Auth info:" gcloud auth list fi else log_error "Authentication failed" exit 1 fi if $VERBOSE; then log_info "Testing access..." if gcloud projects describe "$(gcloud config get-value project 2>/dev/null)" &>/dev/null; then log_info "✓ Access test passed" else log_warn "Access test failed - check IAM permissions" fi fi 4. Usage Examples Basic authentication ./gcloud-sa-login.sh --key-file ./my-key.json With project and verbose output ./gcloud-sa-login.sh -k ./my-key.json -p my-project -v Using jq to extract email # One-liner gcloud auth activate-service-account \ $(jq -r .client_email key.json) \ --key-file=key.json 5. Verification Commands # Check active account gcloud auth list Get current account email gcloud config get-value account Test authentication with API call gcloud projects list Get access token (useful for debugging) gcloud auth print-access-token Get identity token gcloud auth print-identity-token Check service account permissions gcloud iam service-accounts get-iam-policy $SA_EMAIL 6. Docker Integration FROM google/cloud-sdk:latest Copy service account key COPY service-account-key.json /tmp/gcloud-key.json Authenticate RUN gcloud auth activate-service-account $(jq -r .client_email /tmp/gcloud-key.json) --key-file=/tmp/gcloud-key.json --project=my-project Clean up key for security RUN rm /tmp/gcloud-key.json Set default project ENV CLOUDSDK_CORE_PROJECT=my-project gcloud login with service account
# Optionally set as active account if $SET_ACTIVE; then gcloud config set account "$SA_EMAIL" log_info "✓ Set as active account" fi if $VERBOSE; then log_info "Running: $GCLOUD_CMD" set -x
Options: -k, --key-file PATH Service account JSON key file (required) -p, --project ID GCP project ID (optional) -v, --verbose Enable verbose output --no-set-active Don't set as active account -h, --help Show this help message gcloud login with service account
if [[ -n "$PROJECT_ID" ]]; then GCLOUD_CMD="$GCLOUD_CMD --project=$PROJECT_ID" fi
log_info "Authenticating service account: $SA_EMAIL" GCLOUD_CMD="gcloud auth activate-service-account $SA_EMAIL --key-file=$KEY_FILE"