Create a simulator with a specific ID

create_simulator.sh

#!/bin/zsh
#
# To call this function, pass a valid simulator ID:
# > ./create_simulator.sh create_and_boot "00000000-0000-0000-0000-000000000000"

set -euo pipefail

readonly SIMULATOR="iPhone 8"
readonly SIMULATOR_RUNTIME="15.2"
readonly SIMULATOR_NAME="${SIMULATOR}"
readonly SIMULATOR_PARENT_DIR="${HOME}/Library/Developer/CoreSimulator/Devices"

# Create and boot a simulator with a specific id
create_and_boot() {
    readonly SIMULATOR_ID="${1}"
    readonly simulator_entry="$(xcrun simctl list | grep ${SIMULATOR_ID})"

    if [ -z "${simulator_entry}" ]; then
        # If simulator with matching id does not exist, create it
        readonly created_id="$(xcrun simctl create "${SIMULATOR_NAME}" "${SIMULATOR}" "iOS${SIMULATOR_RUNTIME}")"
        rm -rf "${SIMULATOR_PARENT_DIR}/${SIMULATOR_ID}"
        mv "${SIMULATOR_PARENT_DIR}/${created_id}" "${SIMULATOR_PARENT_DIR}/${SIMULATOR_ID}"
        sed -i '' "s|${created_id}|${SIMULATOR_ID}|" "${SIMULATOR_PARENT_DIR}/${SIMULATOR_ID}/device.plist"

        # A new simulator with custom id was created on disk. For it to be detected, the
        # simulator daemon has to be restarted (this will kill the simulator app if running)
        killall com.apple.CoreSimulator.CoreSimulatorService
    else
        # If simulator with matching id exists, erase it and reuse it
        if [[ "${simulator_entry}" =~ "Booted" ]]; then
            xcrun simctl shutdown "${SIMULATOR_ID}"
        fi
        xcrun simctl erase "${SIMULATOR_ID}"
    fi

    xcrun simctl boot "${SIMULATOR_ID}"
    echo "Simulator of type '${SIMULATOR}' with id '${SIMULATOR_ID}' was created and booted"
}

"$@"