help out @springm (DT4 on 20.04)

20.04/DT400/DT400_compile.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+##
+## Author: Per Jensen
+## Contact: [email protected]
+## Licensed under the Apache License 2.0
+##
+
+source envvars
+
+# Change this if you want to run the compile script directly on your machine
+# Release to use
+export RELEASE=release-4.0.0
+
+export VERSION=$(echo $RELEASE|grep -E -o '\-.*')
+export INSTALL_PREFIX="$HOME/programmer/darktable${VERSION}"
+
+# Folder which already contains a darktable git checkout or should be used for a fresh one 
+export DT_SRC_FOLDER="$HOME/git/darktable"
+
+# the code name for Ubuntu used in LLVM's repos
+export CODENAME_LLVM="focal"
+
+"./$_COMPILE"

20.04/DT400/_compile.sh

@@ -0,0 +1,115 @@
+#! /bin/bash
+
+source envvars
+
+#########################
+# don't change below
+#########################
+echo user compiling: 
+id
+# install loads of dependencies
+echo Fetch llvm-snapshot-gpg.key
+curl https://apt.llvm.org/llvm-snapshot.gpg.key|gpg --dearmor > llvm-snapshot-keyring.gpg
+if [ $? != "0" ]
+then
+    echo "Downloading llvm gpg key failed, exiting"  && exit
+fi
+sudo mv llvm-snapshot-keyring.gpg /usr/share/keyrings/
+
+sudo sh -c "echo deb     [signed-by=/usr/share/keyrings/llvm-snapshot-keyring.gpg]  http://apt.llvm.org/${CODENAME_LLVM}/ llvm-toolchain-${CODENAME_LLVM} main > /etc/apt/sources.list.d/llvm.list"
+sudo sh -c "echo deb-src [signed-by=/usr/share/keyrings/llvm-snapshot-keyring.gpg]  http://apt.llvm.org/${CODENAME_LLVM}/ llvm-toolchain-${CODENAME_LLVM} main > /etc/apt/sources.list.d/llvm-src.list"
+sudo apt update && sudo apt upgrade -y
+
+sudo apt install -y lld-12 llvm-12-dev llvm-12-runtime llvm-12 lldb-12 python3-lldb-12  \
+   clang-12  clang-format-12 clang-tidy-12 clang-tools-12 python3-clang-12  \
+   libc++-12-dev libc++1-12 \
+   libc++abi-12-dev libc++abi1-12  \
+   libclang-12-dev libclang1-12 liblldb-12-dev libllvm-12-ocaml-dev libomp-12-dev libomp5-12  \
+   libopencl-clang-dev libopencl-clang10 opencl-c-headers opencl-headers libclang-common-12-dev nvidia-opencl-dev ocl-icd-opencl-dev \
+   intltool cmake
+if [ $? != "0" ]
+then
+    echo "1: Package installation failed, exiting"  && exit
+fi 
+
+sudo apt install -y  libxml2-utils xsltproc libsaxon-java libpthread-workqueue0 libpthread-workqueue-dev  \
+   libc6-dev libglib2.0-dev   \
+   liblensfun-dev libcurl4-openssl-dev libjpeg8-dev libtiff-dev liblcms2-dev libjson-glib-dev  \
+   libgtk-3-0 libgtk-3-dev libxml2-dev libxml2 librsvg2-2 librsvg2-dev libsqlite3-dev  \
+   libexiv2-dev libpugixml-dev lua5.3 liblua5.3-0 liblua5.3-dev libgphoto2-6 libgphoto2-dev colord libcolord-dev  \
+   libgraphicsmagick1-dev imagemagick libmagick++-6.q16-dev libopenexr-dev libopenexr24 desktop-file-utils libgmic-dev
+if [ $? != "0" ]
+then
+    echo "2: Package installation failed, exiting"  && exit
+fi 
+
+sudo apt install -y  libflickcurl-dev libraptor2-dev libopenjp2-7-dev libopenjp2-7 libosmgpsmap-1.0-dev libosmgpsmap-1.0-1  \
+   libcolord-gtk-dev libcolord-gtk1 libcups2-dev libcups2  \
+   libavifile-0.7-bin libavifile-0.7-dev libavifile-0.7-common libavifile-0.7c2 \
+   libsecret-1-dev libsecret-1-0   \
+   libimage-exiftool-perl
+
+if [ $? != "0" ]
+then
+    echo "3: Package installation failed, exiting"  && exit
+fi 
+
+sudo apt install -y  dh-make debhelper libheif-dev libportmidi-dev libsdl2-dev
+
+if [ $? != "0" ]
+then
+    echo "4: Package installation failed, exiting"  && exit
+fi 
+
+# see here: https://github.blog/2022-04-12-git-security-vulnerability-announced/
+# if installing outside $HOME, prefix next line with sudo
+git config --global --add safe.directory "${DT_SRC_FOLDER}"
+
+if [[ -d "$DT_SRC_FOLDER"  ]]; then
+    rm -fr "${DT_SRC_FOLDER}"
+fi
+
+git clone https://github.com/darktable-org/darktable.git "$DT_SRC_FOLDER" 2>&1|tee -a "$LOG" 
+if [[ "${PIPESTATUS[0]}" != "0" ]]; then
+  echo \"git clone\" failed, exiting
+  exit 1
+fi
+
+cd "$DT_SRC_FOLDER"
+git checkout "${RELEASE}" 2>&1|tee -a "$LOG" 
+if [[ "${PIPESTATUS[0]}" != "0" ]]; then
+  echo \"git checkout\" failed, exiting
+  exit 1
+fi
+
+git submodule init   2>&1|tee -a "$LOG"
+if [[ "${PIPESTATUS[0]}" != "0" ]]; then
+  echo \"git submodule init\" failed, exiting
+  exit 1
+fi
+
+git submodule update 2>&1|tee -a "$LOG"
+if [[ "${PIPESTATUS[0]}" != "0" ]]; then
+  echo \"git sumodule update\" failed, exiting
+  exit 1
+fi
+
+# build darktable
+mv "${INSTALL_PREFIX}" "${INSTALL_PREFIX}"-org
+./build.sh --prefix "${INSTALL_PREFIX}" 2>&1|tee -a "$LOG"
+if [ "${PIPESTATUS[0]}" != "0" ]
+then
+    echo "Build failed, exiting"  && exit
+fi
+
+
+#install darktable
+# if installing outside $HOME, prefix next line with sudo
+cmake --build "$DT_SRC_FOLDER/build" --target install -- -j1  2>&1 |tee -a "$LOG"
+if [ "${PIPESTATUS[0]}" != "0" ]
+then
+    echo "Installation failed, exiting"  && exit
+fi
+
+# print --version info
+"${INSTALL_PREFIX}/bin/darktable" --version  2>&1|tee -a "$LOG"

20.04/DT400/envvars

@@ -0,0 +1,10 @@
+#! /bin/bash
+
+LOG="$HOME/DT40.log"
+
+VM_NAME=ubuntu2004-DTcompile
+VM_SIZE=15G
+VM_IMAGE=20.04
+DT_COMPILE_SCRIPT=DT400_compile.sh
+_COMPILE=_compile.sh
+

20.04/DT400/install_in_vm.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+##
+## Author: Per Jensen
+## Contact: [email protected]
+## Licensed under the Apache License 2.0
+##
+
+source envvars
+
+# check if VM exists and is running
+multipass list |grep -E ${VM_NAME}
+if [ $? == "0" ]
+then
+    multipass info ${VM_NAME} |grep -E  "State.*?Running"
+    if [ $? != "0" ]
+    then
+        multipass start ${VM_NAME}
+    fi
+    multipass info ${VM_NAME} |grep -E  "State.*?Running"
+    if [ $? != "0" ]
+    then
+        echo "VM: ${VM_NAME}" does not start, exiting
+        exit 1 
+    fi
+else
+    # create the VM
+    multipass launch -n ${VM_NAME} -d ${VM_SIZE} ${VM_IMAGE}
+    if [ $? != "0" ]
+    then
+        echo "VM: ${VM_NAME}" does not start, exiting
+        exit 1     
+    fi
+fi
+
+echo update OS and start compiling Darktable in virtual machine ${VM_NAME}
+multipass transfer ${DT_COMPILE_SCRIPT} ${_COMPILE} envvars ${VM_NAME}:
+multipass exec ${VM_NAME}  -- chmod u+x ${DT_COMPILE_SCRIPT} ${_COMPILE}
+# in VM: install dependencies, compile and install, then print DT's --version info
+multipass exec ${VM_NAME} -- ./${DT_COMPILE_SCRIPT}

20.04/DT400/master_compile.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+##
+## Author: Per Jensen
+## Contact: [email protected]
+## Licensed under the Apache License 2.0
+##
+
+# Change this if you want to run the compile script directly on your machine
+INSTALL_PREFIX="$HOME/programmer/darktable-master"
+
+# Folder which already contains a darktable git checkout or should be used for a fresh one 
+DT_SRC_FOLDER="$HOME/git/darktable"
+
+# the code name for Ubuntu used in LLVM's repos
+CODENAME_LLVM="jammy"
+
+# Branch to use
+BRANCH=master
+
+source ./_compile.sh

README.md

@@ -71,14 +71,23 @@ compile options:
     chmod u+x install_in_vm.sh
     ./install_in_vm.sh
 
-
-If you have an old VM lying around and want to start from a fresh, do this.
+    If you have an old VM lying around and want to start from a fresh, do this.
 
     multipass stop   ubuntu2204-DTcompile
     multipass delete ubuntu2204-DTcompile
     multipass purge 
 
 
+# Experimental compile of DT 4.0.0 on Ubuntu 20.04
+    I have added an experimental DT 4.0.0 to Ubuntu 20.04
+
+    Issues:
+     - Lua support missing, 20.04 does not satisfy DT4
+     - .heif support probably missing
+     - exiv2 support a bit flaky ("no support for ISOBMFF files (CR3, AVIF, HEIF)"
+
+
+
 ## Build on your machine
 Once you are happy that things work in the VM, consider changing
 the compile script to your liking (set the INSTALL_PREFIX env variable in 22-04/DT400/DT400_compile.sh)