[Bug 1670336] [NEW] Ubiquity problem with encrypted home option: system hangs because of ecryptfs-setup-swap not working with swapfiles

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Description:	Ubuntu Zesty Zapus (development branch)
Release:	17.04
ecryptfs-utils:
  Installato: 111-0ubuntu4
  Candidato:  111-0ubuntu4
  Tabella versione:
 *** 111-0ubuntu4 500
        500 http://it.archive.ubuntu.com/ubuntu zesty/main amd64 Packages
        100 /var/lib/dpkg/status

Ubuntu 17.04 uses swapfiles by default.

If you select the "encrypt home folder" option when creating the main
user during Ubuntu 17.04 beta1 installation (which makes Ubiquity run
also the ecryptfs-setup-swap command), after installation the system
hangs a lot during boot, because it fails to activate swap (output of
"systemctl status swapfile.swap" says "failed to activate swap
/swapfile").

If you install Ubuntu 17.04 beta1 without selecting "encrypt home
folder", and only after installation you run the ecryptfs-migrate-home
utility, everything works. But as soon as you try to manually setup
encrypyted swap (by running ecryptfs-setup-swap), you get the same
problem as above.

In particular, you get the following error when running ecryptfs-setup-
swap:

INFO: Setting up swap: [/swapfile]
device node not found
WARNING: Commented out your unencrypted swap from /etc/fstab
swapon: cannot open /dev/mapper/cryptswap1: No such file or directory

This is due to an ecryptfs-utils bug.
In particular, ecryptfs-setup-swap puts in /etc/crypttab a line like this:

cryptswap1 UID=XXXXXXXX /dev/urandom swap,offset=1024,cipher=aes-xts-
plain64

(like there were a swap partition with UID=XXXXXXXX) while with a
swapfile it should put the following line:

cryptswap1 /swapfile /dev/urandom swap,offset=1024,cipher=aes-xts-
plain64

If you manually change that line and reboot, you get rid of the problem - before rebooting, check also that your /etc/fstab file ends with:
#/swapfile none            swap    sw              0       0
/dev/mapper/cryptswap1 none swap sw 0 0

This bug indirectly affects also Ubiquity, because when you choose the
"encrypt home folder" option during installation, ubiquity runs also
ecryptfs-setup-swap; since Ubuntu 17.04 uses swapfiles by default, and
ecryptfs-setup-swap does not work with swapfiles, after installation you
get the system hanging a lot at boot (and when it finally starts it has
no swap).

I tried both with Ubuntu Budgie and with Ubuntu Gnome, the problem is
the same.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: ecryptfs-utils 111-0ubuntu4
ProcVersionSignature: Ubuntu 4.10.0-9.11-generic 4.10.0
Uname: Linux 4.10.0-9-generic x86_64
ApportVersion: 2.20.4-0ubuntu2
Architecture: amd64
CurrentDesktop: GNOME
Date: Mon Mar  6 12:47:39 2017
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-03-05 (0 days ago)
InstallationMedia: Ubuntu-GNOME 17.04 "Zesty Zapus" - Alpha amd64 (20170219)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: ecryptfs-utils
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ecryptfs
     Importance: High
     Assignee: Tyler Hicks (tyhicks)
         Status: Triaged

** Affects: cryptsetup (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: ubiquity (Ubuntu)
     Importance: Critical
     Assignee: Dimitri John Ledkov (xnox)
         Status: Triaged

** Affects: cryptsetup (Ubuntu Zesty)
     Importance: Undecided
         Status: Confirmed

** Affects: ubiquity (Ubuntu Zesty)
     Importance: High
     Assignee: Dimitri John Ledkov (xnox)
         Status: Triaged


** Tags: amd64 apport-bug artful ecryptfs ecryptfs-utils patch rls-aa-incoming ubiquity zesty
-- 
Ubiquity problem with encrypted home option: system hangs because of ecryptfs-setup-swap not working with swapfiles
https://bugs.launchpad.net/bugs/1670336
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