install.fairie/home/.chezmoiscripts/universal/run_onchange_before_10-system-tweaks.sh.tmpl

{{- if (eq .host.distro.family "linux") -}}
#!/usr/bin/env bash
# @file Linux System Tweaks
# @brief Applies a set of generic Linux system tweaks such as ensuring the hostname is set, setting the timezone, and more
# @description
#     This script applies generic Linux system tweaks that should be made before the rest of the provisioning process.

{{ includeTemplate "universal/profile-before" }}
{{ includeTemplate "universal/logg-before" }}

# @description Sets the hostname using `scutil` on macOS and using `hostname` and `hostnamectl` on Linux. On macOS, the HostName, LocalHostName, and ComputerName
#     are set equal to the value stored in `.host.hostname` (in `.chezmoi.yaml.tmpl`) but with the `.host.domain` stripped off. On Linux, the same is done
#     but only the hostname is set. On Linux, the hostname is set with the `hostname` command and then also with the `hostnamectl` command if it is available.
#
#     ## Sources
#
#     * [Changing Linux hostname permanently](https://www.tecmint.com/set-hostname-permanently-in-linux/)
setHostname() {
  if [ -d /Applications ] && [ -d /System ]; then
    # Source: https://apple.stackexchange.com/questions/287760/set-the-hostname-computer-name-for-macos
    logg info 'Setting macOS hostname / local hostname / computer name'
    sudo scutil --set HostName '{{ .host.hostname | replace .host.domain "" | replace "." "" }}.{{ .host.domain }}' && logg success 'Changed HostName to {{ .host.hostname | replace .host.domain "" | replace "." "" }}.{{ .host.domain }}'
    sudo scutil --set LocalHostName '{{ .host.hostname | replace .host.domain "" | replace "." "" }}' && logg success 'Changed LocalHostName to {{ .host.hostname | replace .host.domain "" | replace "." "" }}'
    sudo scutil --set ComputerName '{{ .host.hostname | replace .host.domain "" | replace "." "" }}' && logg success 'Changed ComputerName to {{ .host.hostname | replace .host.domain "" | replace "." "" }}'
    logg info 'Flushing DNS cache'
    dscacheutil -flushcache
  elif [ -f /etc/passwd ]; then
    logg info 'Setting Linux hostname'
    hostname '{{ .host.hostname | replace .host.domain "" | replace "." "" }}.{{ .host.domain }}' && logg success 'Changed hostname to {{ .host.hostname | replace .host.domain "" | replace "." "" }}.{{ .host.domain }}'
    if command -v hostnamectl > /dev/null; then
      logg info 'Ensuring hostname persists after reboot'
      sudo hostnamectl set-hostname '{{ .host.hostname | replace .host.domain "" | replace "." "" }}.{{ .host.domain }}' && logg success 'Permanently changed hostname to {{ .host.hostname | replace .host.domain "" | replace "." "" }}.{{ .host.domain }}'
    else
      logg warn 'hostnamectl was not available in the PATH - this operating system type might be unsupported'
    fi
  else
    logg warn 'Could not configure hostname because system type was not detectable'
  fi
}

# @description Sets the system timezone using `timedatectl` on Linux and `m` on macOS. If neither commands are available
#     then a warning message is printed.
setTimezone() {
  if command -v timedatectl > /dev/null; then
    ### Linux
    logg info 'Setting timezone to {{ .user.timezone }}'
    sudo timedatectl set-timezone {{ .user.timezone }}
  elif command -v m > /dev/null; then
    ### macOS
    logg info 'Setting timezone to {{ .user.timezone }}' && m timezone set {{ .user.timezone }}
  else
    logg warn 'Neither timedatectl (Linux) or m (macOS) were found on the system'
}

# @description Sets the NTP server using `m` on macOS
setNtpServer() {
  if command -v m > /dev/null; then
    ### macOS
    m ntp set {{ .user.ntpServer}}
  else
    logg warn 'Skipped setting the NTP server'
  fi
}

# @description Increases the amount of memory a process can consume on Linux. In the case of `netdata` and other programs, many systems will suggest
#     increasing the `vm.max_map_count`. According to a [RedHat article](https://access.redhat.com/solutions/99913), the default value is `65530`.
#     This function increases that value to `262144` if `sysctl` is available on the system.
increaseMapCount() {
  if command -v sysctl > /dev/null; then
    logg info 'Increasing vm.max_map_count size to 262144'
    sudo sysctl -w vm.max_map_count=262144 > /dev/null
  fi
}

# @description Configures macOS to enable the notification center
showNotificationCenter() {
  if command -v m > /dev/null; then
    logg info 'Configuring macOS to show notification center' && m notification showcenter YES
  fi
}

# @description Disable the creation of `.DS_Store` files on macOS.
disableDStoreFileCreation() {
  if command -v m > /dev/null; then
    logg info 'Disabling creation of .DS_Store files'
    echo y | m dir dsfiles off
  fi
}

# @description Enables transparent dark-mode on macOS
enableDarkTransparentMode() {
  if command -v m > /dev/null; then
    logg info 'Enabling dark mode' && m appearance darkmode YES
    logg info 'Enabling theme transparency' && m appearance transparency YES
  fi
}

setHostname
setTimezone
setNtpServer
increaseMapCount
showNotificationCenter
disableDStoreFileCreation
enableDarkTransparentMode
{{ end -}}