wasabibackend: Fix create_deps.sh script and update dependencies

The old version of the script tried to parse the output of the dotnet tool,
but apparently, that output changed and thus the list of dependencies was empty.

pkgs/applications/blockchains/wasabibackend/create_deps.sh

@@ -1,13 +1,26 @@
 #! /usr/bin/env nix-shell
-#! nix-shell -i bash -p dotnet-sdk_3 nixfmt
+#! nix-shell -i bash -p dotnet-sdk_3 jq xmlstarlet curl nixfmt
+set -euo pipefail
 
 # Run this script to generate deps.nix
-# ./create_deps.sh /path/to/package/source/checkout > deps.nix
 
 # TODO: consolidate with other dotnet deps generation scripts by which
 #       this script is inspired:
 #       - pkgs/servers/nosql/eventstore/create-deps.sh
 #       - pkgs/development/dotnet-modules/python-language-server/create_deps.sh
+#       - pkgs/misc/emulators/ryujinx/updater.sh
+
+cd "$(dirname "${BASH_SOURCE[0]}")"
+
+deps_file="$(realpath "./deps.nix")"
+
+exec 2>&1 6> "$deps_file"
+
+store_src="$( nix-build ../../../.. -A wasabibackend.src --no-out-link )"
+src="$(mktemp -d)"
+cp -rT "$store_src" "$src"
+chmod -R +w "$src"
+pushd "$src"
 
 URLBASE="https://www.nuget.org/api/v2/package"
 
@@ -30,69 +43,56 @@ DEPS_TEMPLATE="
   sha256 = \"%s\";
 })"
 
+tmpdir="$(mktemp -d -p "$(pwd)")" # must be under source root
+trap 'rm -rf "$tmpdir"' EXIT
 
-function generate_restore_log() {
-  checkout_path=$1
-  >&2 echo "generating restore log for $checkout_path..."
-  cd $checkout_path
-  dotnet nuget locals all --clear
-  dotnet restore -v normal --no-cache WalletWasabi.Backend -r linux-x64
-  cd -
-}
+HOME="$tmpdir" dotnet restore --packages "$tmpdir"/.nuget/packages \
+        --no-cache --force --runtime linux-x64 \
+        WalletWasabi.Backend/WalletWasabi.Backend.csproj >&2
 
-function process_restore_log() {
-  restore_log=$1
-  >&2 echo "processing restore log..."
-  while read line; do
-    if echo $line | grep -q "^[[:space:]]*Installing"; then
-      l=$(echo $line | xargs)
-      l=${l#Installing }
-      l=${l%.}
-      echo $l
+mapfile -t repos < <(
+    xmlstarlet sel -t -v 'configuration/packageSources/add/@value' -n NuGet.config "$tmpdir"/.nuget/NuGet/NuGet.Config |
+        while IFS= read index
+        do
+            curl --compressed -fsL "$index" | \
+                jq -r '.resources[] | select(."@type" == "PackageBaseAddress/3.0.0")."@id"'
+        done
+)
+
+echo $DEPS_HEADER >&6
+
+cd "$tmpdir/.nuget/packages"
+for package in *
+do
+    cd "$package"
+    for version in *
+    do
+        found=false
+        for repo in "${repos[@]}"
+        do
+            url="$repo$package/$version/$package.$version.nupkg"
+            if curl -fsL "$url" -o /dev/null
+            then
+                found=true
+                break
             fi
-  done < $restore_log
-}
+        done
 
-function prefetch_deps() {
-  processed_log=$1
-  >&2 echo "prefetching deps..."
-  while read line; do
-    name=$(echo $line | cut -d' ' -f1)
-    >&2 echo "prefetching '$name' version: $version"
-    version=$(echo $line | cut -d' ' -f2)
-    hash=$(nix-prefetch-url "$URLBASE/$name/$version" 2>/dev/null)
-    echo "$name $version $hash"
-  done < $processed_log
-}
-
-function generate_deps_expression() {
-  packages=$1
-  >&2 echo "generating deps nix-expression..."
-  echo $DEPS_HEADER
-  while read line; do
-    name=$(echo $line | cut -d' ' -f1)
-    version=$(echo $line | cut -d' ' -f2)
-    hash=$(echo $line | cut -d' ' -f3)
-    printf "$DEPS_TEMPLATE" $name $version $hash
-  done < $packages
-  echo $DEPS_FOOTER
-}
-
-function main() {
-  checkout_path=$1
-  tmpdir=$(mktemp -d)
-  generate_restore_log $checkout_path > $tmpdir/restore.log
-  process_restore_log $tmpdir/restore.log > $tmpdir/processed.log
-  prefetch_deps $tmpdir/processed.log > $tmpdir/prefetched.log
-  generate_deps_expression $tmpdir/prefetched.log > $tmpdir/deps.nix
-  nixfmt $tmpdir/deps.nix
-  cat $tmpdir/deps.nix
-  rm -rf $tmpdir
-}
-
-if [ ! -d "$1" ]; then
-    >&2 echo "First argument must be a directory, the path to the package source checkout"
+        if ! $found
+        then
+            echo "couldn't find $package $version" >&2
             exit 1
         fi
 
-main $@
+        sha256=$(nix-prefetch-url "$url" 2>/dev/null)
+
+        printf "$DEPS_TEMPLATE" $package $version $sha256 >&6
+    done
+    cd ..
+done
+
+echo $DEPS_FOOTER >&6
+
+exec 6>&-
+
+nixfmt "$deps_file"