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recipe: Document diffing filesystem contents #1155

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Nov 2, 2021
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recipe: Document diffing filesystem contents #1155

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12 changes: 12 additions & 0 deletions cmd/crane/recipes.md
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,18 @@ diff <(crane config busybox:1.32 | jq) <(crane config busybox:1.33 | jq)
diff <(crane manifest busybox:1.32 | jq) <(crane manifest busybox:1.33 | jq)
```

### Diff filesystem contents

```
diff \
<(crane export gcr.io/kaniko-project/executor:v1.6.0-debug - | tar -tvf - | sort) \
<(crane export gcr.io/kaniko-project/executor:v1.7.0-debug - | tar -tvf - | sort)
```

This will show file size diffs and (unfortunately) modified time diffs.

With some work, you can use `cut` and other built-in Unix tools to ignore these diffs.

### Get total image size

Given an image manifest, you can calculate the total size of all layer blobs and the image's config blob using `jq`:
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