Justin, do you mind testing that for lightsaber? That removes the need to save blobs on the sd-card and to grand the sd-card permissions to all apps.

Comment on attachment 8586915 [details] [diff] [review] import-memory-blob.patch Review of attachment 8586915 [details] [diff] [review]: ----------------------------------------------------------------- Seems to work for me. Thanks!

Comment on attachment 8586915 [details] [diff] [review] import-memory-blob.patch Review of attachment 8586915 [details] [diff] [review]: ----------------------------------------------------------------- ::: dom/apps/ImportExport.jsm @@ +37,5 @@ > const PR_CREATE_FILE = 0x08; > const PR_TRUNCATE = 0x20; > > function debug(aMsg) { > +//#ifdef DEBUG I guess you used this to debug problems while working on the patch, but should be removed now. @@ +246,5 @@ > + return new Promise((aResolve, aReject) => { > + let reader = Cc['@mozilla.org/files/filereader;1'] > + .createInstance(Ci.nsIDOMFileReader); > + reader.onloadend = () => { > + Cu.import("resource://gre/modules/osfile.jsm"); Nit: could you use a lazy module getter? @@ +248,5 @@ > + .createInstance(Ci.nsIDOMFileReader); > + reader.onloadend = () => { > + Cu.import("resource://gre/modules/osfile.jsm"); > + let path = OS.Path.join(OS.Constants.Path.tmpDir, "blob-" + > + this._tmpId + ".zip"); You could use openUnique to generate a file with a unique file name: https://developer.mozilla.org/en-US/docs/Mozilla/JavaScript_code_modules/OSFile.jsm/OS.File_for_the_main_thread#OS.File.openUnique%28%29

The file should be closed after being opened here: https://hg.mozilla.org/integration/b2g-inbound/rev/557609749a57#l1.55 Since you've opened it, you could also directly use |file.write| instead of |writeAtomic|.

Backed out in https://hg.mozilla.org/integration/b2g-inbound/rev/a586f075e7d0 for Windows "Memory blob processed. - got "[object Object]", expected "InvalidZip""

fixed the issues, try run at : https://treeherder.mozilla.org/#/jobs?repo=try&revision=20cb8264e40d pushed: https://hg.mozilla.org/integration/b2g-inbound/rev/f69003e17520