Cannot export from cache in Drone/Docker build

[eriklincoln]

One of the commits yesterday (Aug. 17) broke Glide's ability to copy the cached vendor folder into its final location running inside a Drone (0.4.2) build job using the golang:latest (Debian) Docker image.

I made sure to update all the images and containers to the latest Go 1.7 images. I cannot replicate this locally on OS X with Go 1.7.

Here's the logs I'm getting:

glide install -u
[WARN]  The --update-vendored flag is deprecated. This now works by default.
[INFO]  Loading mirrors from mirrors.yaml file
[INFO]  Downloading dependencies. Please wait...
[INFO]  --> Fetching github.com/urfave/cli.
[INFO]  --> Fetching github.com/GannettDigital/paas-api-state-module.
[INFO]  --> Fetching github.com/Sirupsen/logrus.
[INFO]  --> Fetching github.com/drone/drone-go.
[INFO]  Setting references.
[INFO]  --> Setting version for github.com/Sirupsen/logrus to 4b6ea7319e214d98c938f12692336f7ca9348d6b.
[INFO]  --> Setting version for github.com/drone/drone-go to e34150a175e665a5fa94218fc7ab9986a0bd7732.
[INFO]  --> Setting version for github.com/urfave/cli to 1efa31f08b9333f1bd4882d61f9d668a70cd902e.
[INFO]  --> Setting version for github.com/GannettDigital/paas-api-state-module to c72d3893b33f8f1fae439b709828a2f6aeeffa87.
[INFO]  Exporting resolved dependencies...
[INFO]  --> Exporting github.com/drone/drone-go
[INFO]  --> Exporting github.com/urfave/cli
[INFO]  --> Exporting github.com/GannettDigital/paas-api-state-module
[INFO]  --> Exporting github.com/Sirupsen/logrus
[INFO]  Replacing existing vendor dependencies
[ERROR] Unable to export dependencies to vendor directory: rename /tmp/glide-vendor712514892/vendor /drone/src/github.com/GannettDigital/drone-trigger/vendor: invalid cross-device link

I'm getting the same in other repos/build jobs, too.

[mattfarina]

Can you test the PR on #556.

[mattfarina]

Merged PR. This is fixed.