emulator import file seems to fail on ci / ubuntu based systems

[LanderBeeuwsaert]

[REQUIRED] Environment info

firebase-tools:

• firebase-tools@8.4.3

Platform:
Ubuntu

[REQUIRED] Test case

[REQUIRED] Steps to reproduce

this command:
firebase emulators:start --import=./emulator_data

works locally but gives the following error on our CI build and ubuntu local systems (that is using an ubuntu image):

`> e2e_tests@1.0.0 run-clientapp /opt/atlassian/pipelines/agent/build/e2e_tests

concurrently "firebase emulators:start --import=./emulator_data" "cd .. && cd clientapp && npm run start-em"
[1]
[1] > clientapp@ start-em /opt/atlassian/pipelines/agent/build/clientapp
[1] > ng serve --configuration emulator
[1]
[0] ⚠ emulators: You are not currently authenticated so some features may not work correctly. Please run firebase login to authenticate the CLI.
[0] i emulators: Starting emulators: functions, firestore, database, hosting
[0] ⚠ Your requested "node" version "10" doesn't match your global version "12"
[0] i firestore: Importing data from /opt/atlassian/pipelines/agent/build/e2e_tests/emulator_data/firestore_export/firestore_export.overall_export_metadata
[0] ⚠ It appears you are running in a CI environment. You can avoid downloading the Firestore Emulator repeatedly by caching the /root/.cache/firebase/emulators directory.
[0] i firestore: downloading cloud-firestore-emulator-v1.11.4.jar...
[0]
[0] i firestore: Firestore Emulator logging to firestore-debug.log
[0]
[0] Error: firestore: Firestore Emulator has exited with code: 1
[0] firebase emulators:start --import=./emulator_data exited with code 1
[1] ****************************************************************************************
[1] This is a simple server for use in testing or debugging Angular applications locally.
[1] It hasn't been reviewed for security issues.
[1]
[1] DON'T USE IT FOR PRODUCTION!
***************************************`

the underlying cause seems to be:

Caused by: java.io.FileNotFoundException: /home/tvermeir/devel/confero-cloud/e2e_tests/emulator_data/firestore_export/all_namespaces\all_kinds\all_namespaces_all_kinds.export_metadata (No such file or directory
=> see the directory slashes that first are / and then are \

[REQUIRED] Expected behavior

that this doesn't happen.

[REQUIRED] Actual behavior

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[samtstern]

@LanderBeeuwsaert this looks similar to this issue:
#2421

I see both \ and / in the path from your FileNotFoundException ... did you maybe do your export on Windows and then attempt to import it on Linux?

[LanderBeeuwsaert]

@samtstern yes indeed, the export was done on a windows (my local computer) and the import is done during CI on a Linux. So I agree that it's related to 2421 most probably, and that the emulator import/export fails between different platforms.
If you prefer we can close this issue and I'll just subscribe to 2421?

[samtstern]

@LanderBeeuwsaert thanks for the quick response. As you said, let's consolidate on #2421