Небольшой рефакторинг

build/linux.js

@@ -1,5 +1,8 @@
 const fs = require('fs-extra');
 const path = require('path');
+const util = require('util');
+const stream = require('stream');
+const pipeline = util.promisify(stream.pipeline);
 
 const download = require('download');
 const decompress = require('decompress');
@@ -18,12 +21,13 @@ async function main() {
         await fs.move(publicDir, `${outDir}/public`);
 
     await fs.ensureDir(tempDownloadDir);
-    // Скачиваем ipfs
-    const ipfsRemoteUrl = 'https://dist.ipfs.io/go-ipfs/v0.4.18/go-ipfs_v0.4.18_linux-amd64.tar.gz';
 
-    d = download(ipfsRemoteUrl);
-    d.pipe(fs.createWriteStream(`${tempDownloadDir}/ipfs.tar.gz`));
-    d.on('end', async() => {
+    const ipfsDecompressedFilename = `${tempDownloadDir}/go-ipfs/ipfs`;
+    if (!await fs.pathExists(ipfsDecompressedFilename)) {
+        // Скачиваем ipfs
+        const ipfsRemoteUrl = 'https://dist.ipfs.io/go-ipfs/v0.4.18/go-ipfs_v0.4.18_linux-amd64.tar.gz';
+
+        await pipeline(download(ipfsRemoteUrl), fs.createWriteStream(`${tempDownloadDir}/ipfs.tar.gz`));
         console.log(`done downloading ${ipfsRemoteUrl}`);
 
         //распаковываем
@@ -32,14 +36,17 @@ async function main() {
                 decompressTargz()
             ]
         });
-
         console.log('files decompressed');
-        // копируем в дистрибутив
-        await fs.copy(`${tempDownloadDir}/go-ipfs/ipfs`, `${outDir}/ipfs`);
-        console.log(`copied ${tempDownloadDir}/go-ipfs/ipfs to ${outDir}/ipfs`);
-        //для development
-        await fs.copy(`${tempDownloadDir}/go-ipfs/ipfs`, path.resolve(__dirname, '../server/ipfs'));
-    });
+    }
+
+    // копируем в дистрибутив
+    await fs.copy(ipfsDecompressedFilename, `${outDir}/ipfs`);
+    console.log(`copied ${tempDownloadDir}/go-ipfs/ipfs to ${outDir}/ipfs`);
+    //для development
+    const devIpfsFile = path.resolve(__dirname, '../server/ipfs');
+    if (!await fs.pathExists(devIpfsFile)) {
+        await fs.copy(ipfsDecompressedFilename, devIpfsFile);
+    }
 }
 
 main();