fix: only ignore raw-leaves when file is small and metadata is present (#44)

Following further conversation in ipfs/kubo#6940
it seems for small files it would be better to only ignore the `--raw-leaves`
flag when metadata is actually present.

Author: achingbrain

packages/ipfs-unixfs-importer/src/dag-builder/file/index.js

@@ -53,8 +53,9 @@ const reduce = (file, ipld, options) => {
     if (leaves.length === 1 && leaves[0].single && options.reduceSingleLeafToSelf) {
       const leaf = leaves[0]
 
-      if (leaf.cid.codec === 'raw') {
-        // only one leaf node which is a buffer
+      if (leaf.cid.codec === 'raw' && (file.mtime !== undefined || file.mode !== undefined)) {
+        // only one leaf node which is a buffer - we have metadata so convert it into a
+        // UnixFS entry otherwise we'll have nowhere to store the metadata
         const buffer = await ipld.get(leaf.cid)
 
         leaf.unixfs = new UnixFS({

packages/ipfs-unixfs-importer/test/chunker-custom.spec.js

@@ -69,5 +69,5 @@ describe('custom chunker', function () {
       cid: await inmem.put(Buffer.from('hello world'), mc.RAW)
     }
   }
-  it('works with single part', fromPartsTest(single, 19))
+  it('works with single part', fromPartsTest(single, 11))
 })

packages/ipfs-unixfs-importer/test/importer.spec.js

@@ -140,12 +140,22 @@ const strategyOverrides = {
       size: 2669627,
       type: 'directory'
     },
-    '200Bytes.txt with raw leaves': {
+    '200Bytes.txt with raw leaves': extend({}, baseFiles['200Bytes.txt'], {
       cid: 'QmagyRwMfYhczYNv5SvcJc8xxXjZQBTTHS2jEqNMva2mYT',
-      size: 200,
-      path: '200Bytes.txt',
-      type: 'file'
-    },
+      size: 200
+    }),
+    '200Bytes.txt with raw leaves and mode': extend({}, baseFiles['200Bytes.txt'], {
+      cid: 'QmRYYSoRkL9bh5gzbgHndWjt81TYnM4W7MjzTp8WWioLGB',
+      size: 200
+    }),
+    '200Bytes.txt with raw leaves and mtime': extend({}, baseFiles['200Bytes.txt'], {
+      cid: 'QmQ1QHqXqgxJ4qjJZouRdYG7pdS6yzdhSAq7dYAu9bN6h4',
+      size: 200
+    }),
+    '200Bytes.txt with raw leaves and metadata': extend({}, baseFiles['200Bytes.txt'], {
+      cid: 'QmWUpftnvHN1Ey5iGoaWwMUZPnViXeJctDSUkcvunkahFo',
+      size: 200
+    }),
     'foo/bar': {
       cid: 'QmTGMxKPzSGNBDp6jhTwnZxGW6w1S9ciyycRJ4b2qcQaHK',
       size: 0,
@@ -260,7 +270,18 @@ strategies.forEach((strategy) => {
       type: 'directory'
     },
     '200Bytes.txt with raw leaves': extend({}, baseFiles['200Bytes.txt'], {
-      cid: 'QmQmZQxSKQppbsWfVzBvg59Cn3DKtsNVQ94bjAxg2h3Lb8',
+      cid: 'zb2rhXrz1gkCv8p4nUDZRohY6MzBE9C3HVTVDP72g6Du3SD9Q'
+    }),
+    '200Bytes.txt with raw leaves and mode': extend({}, baseFiles['200Bytes.txt'], {
+      cid: 'QmWXbKV9BKJqd8x1NUw1myH987bURrn9Rna3rszYJgQwtX',
+      size: 200
+    }),
+    '200Bytes.txt with raw leaves and mtime': extend({}, baseFiles['200Bytes.txt'], {
+      cid: 'QmYfLToWgeJwrFFKideGNaS1zkmrow1a9o862sUL43NapC',
+      size: 200
+    }),
+    '200Bytes.txt with raw leaves and metadata': extend({}, baseFiles['200Bytes.txt'], {
+      cid: 'QmVfHowk2oKuWFyVwSRt8H1dQ3v272jyWSwhfQnTtWNmfw',
       size: 200
     })
   }, strategyOverrides[strategy])
@@ -443,6 +464,58 @@ strategies.forEach((strategy) => {
       ])
     })
 
+    it('small file (smaller than a chunk) with raw leaves and mode', async () => {
+      const files = await all(importer([{
+        path: '200Bytes.txt',
+        content: smallFile,
+        mode: 0o123
+      }], ipld, {
+        ...options,
+        rawLeaves: true
+      }))
+
+      expectFiles(files, [
+        '200Bytes.txt with raw leaves and mode'
+      ])
+    })
+
+    it('small file (smaller than a chunk) with raw leaves and mtime', async () => {
+      const files = await all(importer([{
+        path: '200Bytes.txt',
+        content: smallFile,
+        mtime: {
+          secs: 10,
+          nsecs: 0
+        }
+      }], ipld, {
+        ...options,
+        rawLeaves: true
+      }))
+
+      expectFiles(files, [
+        '200Bytes.txt with raw leaves and mtime'
+      ])
+    })
+
+    it('small file (smaller than a chunk) with raw leaves and metadata', async () => {
+      const files = await all(importer([{
+        path: '200Bytes.txt',
+        content: smallFile,
+        mode: 0o123,
+        mtime: {
+          secs: 10,
+          nsecs: 0
+        }
+      }], ipld, {
+        ...options,
+        rawLeaves: true
+      }))
+
+      expectFiles(files, [
+        '200Bytes.txt with raw leaves and metadata'
+      ])
+    })
+
     it('small file (smaller than a chunk) inside a dir', async () => {
       const files = await all(importer([{
         path: 'foo/bar/200Bytes.txt',