Autofs support

[bjornleffler]

A few users have asked for autofs support, so I'm going to investigate this.

[FossPrime]

Issue is with this intentional blocking... perhaps let's replace it with an stdout comment.
Note, this probably also breaks Mac OS's Auto FS implementation

gcsfuse/vendor/github.com/jacobsa/fuse/mount.go

Line 33 in e642a49

// supplied Server to serve connection requests. It blocks until the file

[FossPrime]

Another issue is the -v mount parameter causes an error if autofs.conf has

# mount_verbose - use the -v flag when calling mount(8) and log some
#                 process information about the requestor and its parent.
mount_verbose = yes

currently with a autofs direct mount it will not work, as autofs seems to use a virtual mountpoint that is then relayed through the mount type autofs.

Dec 16 15:42:31 big systemd[1]: Started Automounts filesystems on demand.
Dec 16 15:42:38 big automount[5807]: attempting to mount entry /mnt3/john/gcs-bucket
Dec 16 15:42:38 big automount[5807]: >> Calling gcsfuse with arguments: -o allow_other --dir-mode 775 --gid 1000 --uid 1000 --key-file key.json -o rw -o nonempty --file-mode 775 gcs-bucket /mnt3/john/gcs-bucket
Dec 16 15:42:38 big automount[5807]: >> Using mount point: /mnt3/john/gcs-bucket
Dec 16 15:42:38 big automount[5807]: >> Opening GCS connection...
Dec 16 15:42:38 big automount[5807]: >> Opening bucket...
Dec 16 15:42:38 big automount[5807]: >> Mounting file system...

And that's where the never ending hang up, hangs. Of note, make sure to killall gcsfuse, as autofs/go-fuse will leave a bugged remnant that will block umount.