update-unreal.sh

#!/bin/bash
# udpate-unreal.sh [ -check | -clean | -clean-quick]
# Downloads and compiles Unreal Engine from Epic's github account.
# - Use argument "-check" to check for an update.
# - Use argument "-clean" to do a full build.
# - Use argument "-clean-quick" to do a quick clean (eg. when updating pre-compiled headers)
#
# based on https://wiki.unrealengine.com/Building_On_Linux
# (see also https://github.com/EpicGames/UnrealEngine/tree/release/Engine/Build/BatchFiles/Linux)
#
#
# Revision History:
# 2022-Apr-17 code@codywohlers.ca - update to unreal 5 ( UE4Editor -> UnrealEditor )
# 2020-May-27 code@codywohlers.ca - updated git to use github ssh.
# 2020-Jan-07 code@codywohlers.ca - updated as per latest wiki instructions.
# 2017-Sep-25 code@codywohlers.ca - added --force to git pull.
# 2017-Sep-14 code@codywohlers.ca - changed "-clean-precompiled" argument to "-clean-quick".


if [[ $(id -u) -eq 0 ]] ;then echo "Error: Please don't run as root" >&2 ;exit 1 ;fi

UNREAL_DIR="/opt/UnrealEngine"  # must be owned by you (don't use sudo)

set -e

cd "$UNREAL_DIR"

if [ "$1" == "-check" ] ;then
    git remote update
    git status
    exit
else
    git pull --force "git@github.com:EpicGames/UnrealEngine.git" release  # must have linked your github account to your epic account and set up github ssh key.
fi

./Setup.sh
./GenerateProjectFiles.sh

if [ "$1" == "-clean" ] ;then
make CrashReportClient \
    CrashReportClientEditor \
    ShaderCompileWorker \
    UnrealLightmass \
    UnrealFrontend \
    UnrealEditor \
    UnrealInsights \
    UnrealPak \
    ARGS=-clean
elif [ "$1" == "-clean-quick" ] ;then  # not updated since 4.0x
    find Engine/Intermediate/Build/Linux/ -name PCH.Core.h.gch -exec rm -v '{}' \;
    find Engine/Intermediate/Build/Linux/ -name PCH.CoreUObject.h.gch -exec rm -v '{}' \;
    find Engine/Intermediate/Build/Linux/ -name PCH.Engine.h.gch -exec rm -v '{}' \;
    find Engine/Intermediate/Build/Linux/ -name PCH.UnrealEd.h.gch -exec rm -v '{}' \;
    find Engine/Intermediate/Build/Linux/ -name SharedPCH.Core.h.gch -exec rm -v '{}' \;
    find Engine/Intermediate/Build/Linux/ -name SharedPCH.CoreUObject.h.gch -exec rm -v '{}' \;
    find Engine/Intermediate/Build/Linux/ -name SharedPCH.Engine.h.gch -exec rm -v '{}' \;
    find Engine/Intermediate/Build/Linux/ -name SharedPCH.UnrealEd.h.gch -exec rm -v '{}' \;
fi

make
make UnrealPak