Removing "react" button from Skypeforlinux ebuild

_Skype for Linux emoticon removal.md

Skype for Linux comes packaged as Electron application. The code describing client behavior is in file app.asar. This file can be edited after emerging to hide the "React" button, which can be done by calling an ebuild hook

Installation

1. Create /etc/portage/bashrc with content from below
2. Create /etc/portage/hooks/net-im/skypeforlinux/post-install with content from below
3. emerge skypeforlinux

Troubleshooting

The hook logs its actions and saves a backup. In case skype does not start after this - replace app.asar with the backed up version.

Notes

This also hides "Expression picker" to the left of chat pane

Credits & further reading

• http://davydm.blogspot.com/2017/01/gentoo-adventures-running-script-after.html
• https://dev.gentoo.org/~zmedico/portage/doc/portage.html#package-ebuild-phases

bashrc

# /etc/portage/bashrc
PORTAGE_HOOKS_PREFIX=/etc/portage/hooks
PACKAGE_HOOKS_DIR="$PORTAGE_HOOKS_PREFIX/$CATEGORY/$PN"
CATEGORY_HOOKS_DIR="$PORTAGE_HOOKS_PREFIX/$CATEGORY"
function source_all() {
  if test -d "$1"; then
    for f in $1/*; do
      if test -f "$f"; then
        source "$f"
      fi
    done
  fi
}
source_all "$CATEGORY_HOOKS_DIR"
source_all "$PACKAGE_HOOKS_DIR"

post-install

# /etc/portage/hooks/net-im/skypeforlinux/post-install
function post_pkg_postinst() {
  _SKYPE_UUID=$(uuidgen)
  _APP_ASAR_LOC=$(qlist skypeforlinux| grep /app.asar$)
  _APP_ASAR_NEW_LOC="/tmp/app.asar_${_SKYPE_UUID}"
  einfo "Copying app.asar from ${_APP_ASAR_LOC} to ${_APP_ASAR_NEW_LOC}" 
  cp /opt/skypeforlinux/resources/app.asar ${_APP_ASAR_NEW_LOC} 
  einfo "Backing up ${_APP_ASAR_NEW_LOC} to ${_APP_ASAR_NEW_LOC}_bkp"
  cp ${_APP_ASAR_NEW_LOC}{,_bkp}
  einfo "Applying emoticon patch to copied version"
  perl -pi -e 's|EmoticonStroke=".*?"|EmoticonStroke="  " |' ${_APP_ASAR_NEW_LOC}
  einfo "Copying the file back"
  cp -f ${_APP_ASAR_NEW_LOC} ${_APP_ASAR_LOC}
}