scripts/project-helper-tools/update_blender.sh

@@ -12,7 +12,7 @@ DOWNLOAD_DIR=../../shared/artifacts/blender
 mkdir -p $DOWNLOAD_DIR
 
 # Switch to the download directory
-pushd $DOWNLOAD_DIR
+cd $DOWNLOAD_DIR
 
 # .zip == Windows
 # .dmg == Mac
@@ -27,43 +27,63 @@ latest_urls=$(wget --quiet -O - "$HOMEPAGE" | \
   sed -e 's/^<a href=["'"'"']//i' -e 's/["'"'"']$//i' | \
   grep +$BLENDER_BRANCH)
 
-for os in windows darwin.arm64 linux
+# Create a snapshot of the existing files
+mkdir -p previous/current_snapshot
+# Backup the old files, if there are any
+cp * previous/current_snapshot || true
+
+updated_downloads=false
+downloaded_files=false
+
+for os in windows darwin.x86_64 darwin.arm64 linux
 do
   file_extention="${extensions[$os]}"
 
   latest=$(echo "$latest_urls" | grep $os | grep $file_extention$ )
 
-  # Strip carridge returns from teh sha sum as the windows ones has it
+  # Strip carridge returns from the sha sum as the windows ones has it
   shasum=$(curl -s "$latest".sha256 | tr -d '\r')
 
-  echo sum: "$shasum" *"$file_extention"
+  current_os_file=*$os*$file_extention
   # Check if we need to download the file by looking at the shasum of the currently downloaded file (if any)
-  if [ ! -f *$file_extention ]; then
-    # Make sure that we don't have any lingering sha files
-    rm *$file_extention* || true # "|| true" is here to ensure that we catch the case were there are no files to remove for "set -e"
-  else
+  if [ -f $current_os_file ]; then
     # Skip downloading if shasum matches the current file on disk
-    echo $shasum *$file_extention | sha256sum --check - && echo $os: already at latest version && continue
+    echo $shasum $current_os_file | sha256sum --check - && echo $os: already at latest version && continue
 
-    mkdir -p previous
-    mv *$file_extention* previous/
-
-    pushd previous
-    # Remove older backups if there are more than 10
-    num_old_files=$(ls -1 *$file_extention | wc -l)
-    if [ "$num_old_files" -ge 10 ]; then
-      files_to_remove=$(ls -t *$file_extention | tail $((10-$num_old_files)))
-      # Add the shasums as well
-      shasums_to_remove=$(echo $files_to_remove | sed -e 's/$/.sha256')
-      rm $files_to_remove $shasums_to_remove
-    fi
-    popd
+    updated_downloads=true
   fi
+  # Make sure that we don't have any lingering files from this os
+  rm $current_os_file* || true # "|| true" is here to ensure that we catch the case were there are no files to remove for "set -e"
 
   wget -c "$latest"
   wget -c "$latest".sha256
 
-  echo $shasum *$file_extention | sha256sum --check - || (echo Downloaded file does not match its shasum, exiting! && exit 1)
+  echo $shasum *$os*$file_extention | sha256sum --check - || (echo Downloaded file does not match its shasum, exiting! && exit 1)
+  downloaded_files=true
 done
 
+if [ "$downloaded_files" = true ] ; then
+  # Save download date for use in the rollback script
+  date -R > download_date
+fi
+
+if [ "$updated_downloads" = true ] ; then
+  pushd previous
+
+  # Put the current backup first in the directory listing
+  mv current_snapshot 00
+
+  # Bump all folder names
+  # Assign a number to each file, reverse the processing order to not overwrite any files.
+  ls -v | cat -n | tac | while read n f; do mv -n "$f" "$(printf "%02d" $n)"; done
+
+  # Remove older backup folders if there are more than 10
+  num_old_files=$(ls -1 | wc -l)
+  if [ "$num_old_files" -ge 10 ]; then
+    files_to_remove=$(ls | tail $((10-$num_old_files)))
+    rm -fr $files_to_remove
+  fi
   popd
+else
+  rm -fr previous/current_snapshot
+fi