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add vfs snapshot capability for future tests

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This commit is contained in:
Ron Buckton 2018-06-13 11:24:16 -07:00
parent e756182e21
commit c4f1d7755d
1 changed files with 18 additions and 0 deletions
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18
src/harness/vfs.ts
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@ -126,6 +126,24 @@ namespace vfs {
return this._shadowRoot;
}
/**
* Snapshots the current file system, effectively shadowing itself. This is useful for
* generating file system patches using `.diff()` from one snapshot to the next. Performs
* no action if this file system is read-only.
*/
public snapshot() {
if (this.isReadonly) return;
const fs = new FileSystem(this.ignoreCase, { time: this._time });
fs._lazy = this._lazy;
fs._cwd = this._cwd;
fs._time = this._time;
fs._shadowRoot = this._shadowRoot;
fs._dirStack = this._dirStack;
fs.makeReadonly();
this._lazy = {};
this._shadowRoot = fs;
}
/**
* Gets a shadow copy of this file system. Changes to the shadow copy do not affect the
* original, allowing multiple copies of the same core file system without multiple copies