electrs: 0.7.1 -> 0.8.3

Use buildRustPackage instead of buildRustCrate (via crate2nix).

buildRustPackage builds the whole executable and its libraries in a
single `cargo build` process.

With the create2nix approach each library is built in a separate derivation,
directly using rustc instead of the cargo wrapper.

Benefits of buildRustPackage:
- Much simpler to maintain
- Package derivation evaluates much faster

Benefits of crate2nix:
- Build can be distributed over multiple build hosts
- Better sharing of common dependencies between different builds
- More fine-grained rebuilding on build failures

In nixpkgs buildRustPackage is used for almost all Rust pkgs, it's
also a better fit for our use case.

pkgs/default.nix

@@ -4,7 +4,7 @@
   lightning-charge = pkgs.callPackage ./lightning-charge { };
   nanopos = pkgs.callPackage ./nanopos { };
   spark-wallet = pkgs.callPackage ./spark-wallet { };
-  electrs = (pkgs.callPackage ./electrs { }).rootCrate.build;
+  electrs = pkgs.callPackage ./electrs { };
   elementsd = pkgs.callPackage ./elementsd { withGui = false; };
   hwi = pkgs.callPackage ./hwi { };
   pylightning = pkgs.python3Packages.callPackage ./pylightning { };

pkgs/electrs/generate.sh

@@ -1,45 +0,0 @@
-#! /usr/bin/env nix-shell
-#! nix-shell -i bash -p git gnupg dirmngr
-set -e
-
-# Creating temporary directory
-echo "Creating temporary directory"
-DIR="$(mktemp -d)"
-cd $DIR
-git clone https://github.com/romanz/electrs
-
-# Checking out latest release
-echo "Checking out latest release"
-cd electrs
-latesttagelectrs=$(git describe --tags `git rev-list --tags --max-count=1`)
-git checkout ${latesttagelectrs}
-echo "Latest release is ${latesttagelectrs}"
-
-# Optional GPG Verification
-read -p "Do you want to import Roman Zeyde's PGP Key (46917CBB)? [yN]" -r
-echo
-if [[ $REPLY =~ ^[Yy]$ ]]
-then
-echo "Getting Roman Zeyde's PGP key"
-gpg --recv-keys 15C8C3574AE4F1E25F3F35C587CAE5FA46917CBB
-echo "Verifying latest release"
-git verify-tag ${latesttagelectrs}
-fi
-
-echo "Generating crate2nix expression"
-git clone https://github.com/kolloch/crate2nix ../crate2nix
-cd ../crate2nix
-git checkout e311fc6f88b61e1eda85e8c588e7c23dea03b532 # latest commit that works
-cd ../electrs
-nix-shell -v ../crate2nix/shell.nix --run "crate2nix generate"
-
-echo "Fixing nix expression"
-sed -i 's/(path+file.*)/(registry+https:\/\/github.com\/romanz\/electrs)/g' default.nix
-sed -i '/crateName = "electrs";/i\        name = "electrs-${version}";' default.nix
-sed -i 's/src = (builtins.filterSource sourceFilter .\/.);/sha256 = "<insert correct hash here>";/g' default.nix
-# @jb55's fixes from https://github.com/jb55/electrs/commit/e3bed69c17dac1af1be34d18e5be2c815c20838c
-sed -i '/lib? pkgs.lib/a\  llvmPackages ? pkgs.llvmPackages,' default.nix
-sed -i 's/resolvedDefaultFeatures = \[ "bzip2" "default" "lz4" "snappy" "static" "zlib" "zstd" \]/resolvedDefaultFeatures = \[ "bzip2" "default" "lz4" "snappy" "static" "zlib" \]/g' default.nix
-sed -i '/crateName = "librocksdb-sys";/a\\n        enableParallelBuilding = true;\n        buildInputs = [ pkgs.clang ];\n        LIBCLANG_PATH = "${llvmPackages.libclang}/lib";\n' default.nix
-sed -i 's/"default" = \[ "snappy" "lz4" "zstd" "zlib" "bzip2" \];/"default" = \[ "snappy" "zstd" "zlib" "bzip2" \];/g' default.nix
-echo "Done. You now have your pkgs/electrs/default.nix expression in $DIR/electrs/default.nix. Just replace the electrs sha256 and you'll be good to go."