Comment 1 for bug 1631270

The following setup gives me a working shell

> export SNAP_NAME=test-snapd-tools
> /usr/lib/snapd/snap-confine snap.test-snapd-tools.head /bin/bash

with the following /proc/self/mountinfo:

qemu:ubuntu-14.04-64 .../tests/main/try# cat /proc/self/mountinfo
79 48 7:0 / / rw,relatime - squashfs /dev/loop0 ro
80 79 0:6 / /dev rw,relatime - devtmpfs udev rw,size=736824k,nr_inodes=184206,mode=755
81 80 0:14 / /dev/pts rw,nosuid,noexec,relatime - devpts devpts rw,gid=5,mode=620,ptmxmode=000
82 79 8:1 /etc /etc rw,relatime - ext4 /dev/sda1 rw,data=ordered
83 79 8:1 /home /home rw,relatime - ext4 /dev/sda1 rw,data=ordered
84 79 8:1 /root /root rw,relatime - ext4 /dev/sda1 rw,data=ordered
85 79 0:4 / /proc rw,nosuid,nodev,noexec,relatime - proc proc rw
86 79 0:17 / /sys rw,nosuid,nodev,noexec,relatime - sysfs sysfs rw
87 86 0:19 / /sys/fs/cgroup rw,relatime - tmpfs none rw,size=4k,mode=755
88 87 0:25 / /sys/fs/cgroup/systemd rw,nosuid,nodev,noexec,relatime - cgroup systemd rw,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd
89 87 0:26 / /sys/fs/cgroup/cpuset rw,relatime - cgroup cgroup rw,cpuset
90 87 0:27 / /sys/fs/cgroup/cpu rw,relatime - cgroup cgroup rw,cpu
91 87 0:28 / /sys/fs/cgroup/cpuacct rw,relatime - cgroup cgroup rw,cpuacct
92 87 0:29 / /sys/fs/cgroup/blkio rw,relatime - cgroup cgroup rw,blkio
93 87 0:30 / /sys/fs/cgroup/memory rw,relatime - cgroup cgroup rw,memory
94 87 0:31 / /sys/fs/cgroup/devices rw,relatime - cgroup cgroup rw,devices
95 87 0:32 / /sys/fs/cgroup/freezer rw,relatime - cgroup cgroup rw,freezer
96 87 0:33 / /sys/fs/cgroup/net_cls rw,relatime - cgroup cgroup rw,net_cls
97 87 0:34 / /sys/fs/cgroup/perf_event rw,relatime - cgroup cgroup rw,perf_event
98 87 0:35 / /sys/fs/cgroup/net_prio rw,relatime - cgroup cgroup rw,net_prio
99 87 0:36 / /sys/fs/cgroup/hugetlb rw,relatime - cgroup cgroup rw,hugetlb
100 87 0:37 / /sys/fs/cgroup/pids rw,relatime - cgroup cgroup rw,pids
101 86 0:20 / /sys/fs/fuse/connections rw,relatime - fusectl none rw
102 86 0:7 / /sys/kernel/debug rw,relatime - debugfs none rw
103 86 0:12 / /sys/kernel/security rw,relatime - securityfs none rw
104 86 0:24 / /sys/fs/pstore rw,relatime - pstore none rw
105 79 8:1 /tmp /tmp rw,relatime - ext4 /dev/sda1 rw,data=ordered
106 105 7:0 / /tmp/snap.rootfs_aECzku rw,relatime - squashfs /dev/loop0 ro
107 106 0:6 / /tmp/snap.rootfs_aECzku/dev rw,relatime - devtmpfs udev rw,size=736824k,nr_inodes=184206,mode=755
108 107 0:14 / /tmp/snap.rootfs_aECzku/dev/pts rw,nosuid,noexec,relatime - devpts devpts rw,gid=5,mode=620,ptmxmode=000
109 106 8:1 /etc /tmp/snap.rootfs_aECzku/etc rw,relatime - ext4 /dev/sda1 rw,data=ordered
110 106 8:1 /home /tmp/snap.rootfs_aECzku/home rw,relatime - ext4 /dev/sda1 rw,data=ordered
111 106 8:1 /root /tmp/snap.rootfs_aECzku/root rw,relatime - ext4 /dev/sda1 rw,data=ordered
112 106 0:4 / /tmp/snap.rootfs_aECzku/proc rw,nosuid,nodev,noexec,relatime - proc proc rw
113 106 0:17 / /tmp/snap.rootfs_aECzku/sys rw,nosuid,nodev,noexec,relatime - sysfs sysfs rw
114 113 0:19 / /tmp/snap.rootfs_aECzku/sys/fs/cgroup rw,relatime - tmpfs none rw,size=4k,mode=755
115 114 0:25 / /tmp/snap.rootfs_aECzku/sys/fs/cgroup/systemd rw,nosuid,nodev,noexec,relatime - cgroup systemd rw,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd
116 114 0:26 / /tmp/snap.rootfs_aECzku/sys/fs/cgroup/cpuset rw,relatime - cgroup cgroup rw,cpuset
117 114 0:27 / /tmp/snap.rootfs_aECzku/sys/fs/cgroup/cpu rw,relatime - cgroup cgroup rw,cpu
118 114 0:28 / /tmp/snap.rootfs_aECzku/sys/fs/cgroup/cpuacct rw,relatime - cgroup cgroup rw,cpuacct
119 114 0:29 / /tmp/snap.rootfs_aECzku/sys/fs/cgroup/blkio rw,relatime - cgroup cgroup rw,blkio
120 114 0:30 / /tmp/snap.rootfs_aECzku/sys/fs/cgroup/memory rw,relatime - cgroup cgroup rw,memory
121 114 0:31 / /tmp/snap.rootfs_aECzku/sys/fs/cgroup/devices rw,relatime - cgroup cgroup rw,devices
122 114 0:32 / /tmp/snap.rootfs_aECzku/sys/fs/cgroup/freezer rw,relatime - cgroup cgroup rw,freezer
123 114 0:33 / /tmp/snap.rootfs_aECzku/sys/fs/cgroup/net_cls rw,relatime - cgroup cgroup rw,net_cls
124 114 0:34 / /tmp/snap.rootfs_aECzku/sys/fs/cgroup/perf_event rw,relatime - cgroup cgroup rw,perf_event
125 114 0:35 / /tmp/snap.rootfs_aECzku/sys/fs/cgroup/net_prio rw,relatime - cgroup cgroup rw,net_prio
126 114 0:36 / /tmp/snap.rootfs_aECzku/sys/fs/cgroup/hugetlb rw,relatime - cgroup cgroup rw,hugetlb
127 114 0:37 / /tmp/snap.rootfs_aECzku/sys/fs/cgroup/pids rw,relatime - cgroup cgroup rw,pids
128 113 0:20 / /tmp/snap.rootfs_aECzku/sys/fs/fuse/connections rw,relatime - fusectl none rw
129 113 0:7 / /tmp/snap.rootfs_aECzku/sys/kernel/debug rw,relatime - debugfs none rw
130 113 0:12 / /tmp/snap.rootfs_aECzku/sys/kernel/security rw,relatime - securityfs none rw
131 113 0:24 / /tmp/snap.rootfs_aECzku/sys/fs/pstore rw,relatime - pstore none rw
132 79 8:1 /var/snap /var/snap rw,relatime - ext4 /dev/sda1 rw,data=ordered
133 52 8:1 /var/lib/snapd /var/lib/snapd rw,relatime - ext4 /dev/sda1 rw,data=ordered
134 79 8:1 /var/tmp /var/tmp rw,relatime - ext4 /dev/sda1 rw,data=ordered
135 79 0:18 / /run rw,nosuid,noexec,relatime - tmpfs tmpfs rw,size=149564k,mode=755
136 135 0:21 / /run/lock rw,nosuid,nodev,noexec,relatime - tmpfs none rw,size=5120k
137 135 0:22 / /run/shm rw,nosuid,nodev,relatime - tmpfs none rw
138 135 0:23 / /run/user rw,nosuid,nodev,noexec,relatime - tmpfs none rw,size=102400k,mode=755
139 135 0:18 /snapd/ns /run/snapd/ns rw,nosuid,noexec,relatime - tmpfs tmpfs rw,size=149564k,mode=755
140 79 8:1 /media /media rw,relatime - ext4 /dev/sda1 rw,data=ordered
141 79 8:1 /lib/modules /lib/modules rw,relatime - ext4 /dev/sda1 rw,data=ordered
142 79 8:1 /usr/src /usr/src rw,relatime - ext4 /dev/sda1 rw,data=ordered
143 79 8:1 /var/log /var/log rw,relatime - ext4 /dev/sda1 rw,data=ordered
144 79 8:1 /snap /snap rw,relatime - ext4 /dev/sda1 rw,data=ordered
145 144 7:0 / /snap/core/6 rw,relatime - squashfs /dev/loop0 ro
146 144 8:1 /home/gopath/src/github.com/snapcore/snapd/tests/lib/snaps/test-snapd-tools /snap/test-snapd-tools/x1 rw,relatime - ext4 /dev/sda1 rw,data=ordered
147 82 7:0 /etc/alternatives /etc/alternatives rw,relatime - squashfs /dev/loop0 ro
148 133 8:1 / /var/lib/snapd/hostfs rw,relatime - ext4 /dev/sda1 rw,data=ordered
49 105 8:1 /tmp/snap.0_snap.test-snapd-tools.success_SFku4J/tmp /tmp rw,relatime - ext4 /dev/sda1 rw,data=ordered
50 81 0:38 / /dev/pts rw,relatime - devpts devpts rw,gid=5,mode=620,ptmxmode=666
51 80 0:38 /ptmx /dev/ptmx rw,relatime - devpts devpts rw,gid=5,mode=620,ptmxmode=666
52 79 0:39 / /var/lib rw,nosuid,nodev,relatime - tmpfs none rw
53 52 7:0 /var/lib/apparmor /var/lib/apparmor rw,relatime - squashfs /dev/loop0 ro
54 52 7:0 /var/lib/classic /var/lib/classic rw,relatime - squashfs /dev/loop0 ro
55 52 7:0 /var/lib/console-conf /var/lib/console-conf rw,relatime - squashfs /dev/loop0 ro
56 52 7:0 /var/lib/dbus /var/lib/dbus rw,relatime - squashfs /dev/loop0 ro
57 52 7:0 /var/lib/dhcp /var/lib/dhcp rw,relatime - squashfs /dev/loop0 ro
58 52 7:0 /var/lib/extrausers /var/lib/extrausers rw,relatime - squashfs /dev/loop0 ro
59 52 7:0 /var/lib/initramfs-tools /var/lib/initramfs-tools rw,relatime - squashfs /dev/loop0 ro
60 52 7:0 /var/lib/initscripts /var/lib/initscripts rw,relatime - squashfs /dev/loop0 ro
61 52 7:0 /var/lib/insserv /var/lib/insserv rw,relatime - squashfs /dev/loop0 ro
62 52 7:0 /var/lib/logrotate /var/lib/logrotate rw,relatime - squashfs /dev/loop0 ro
63 52 7:0 /var/lib/machines /var/lib/machines rw,relatime - squashfs /dev/loop0 ro
64 52 7:0 /var/lib/misc /var/lib/misc rw,relatime - squashfs /dev/loop0 ro
65 52 7:0 /var/lib/pam /var/lib/pam rw,relatime - squashfs /dev/loop0 ro
66 52 7:0 /var/lib/python /var/lib/python rw,relatime - squashfs /dev/loop0 ro
67 52 7:0 /var/lib/resolvconf /var/lib/resolvconf rw,relatime - squashfs /dev/loop0 ro
69 52 7:0 /var/lib/sudo /var/lib/sudo rw,relatime - squashfs /dev/loop0 ro
70 52 7:0 /var/lib/systemd /var/lib/systemd rw,relatime - squashfs /dev/loop0 ro
71 52 7:0 /var/lib/ubuntu-fan /var/lib/ubuntu-fan rw,relatime - squashfs /dev/loop0 ro
72 52 7:0 /var/lib/ucf /var/lib/ucf rw,relatime - squashfs /dev/loop0 ro
73 52 7:0 /var/lib/update-rc.d /var/lib/update-rc.d rw,relatime - squashfs /dev/loop0 ro
74 52 7:0 /var/lib/urandom /var/lib/urandom rw,relatime - squashfs /dev/loop0 ro
75 52 7:0 /var/lib/vim /var/lib/vim rw,relatime - squashfs /dev/loop0 ro
76 52 7:0 /var/lib/waagent /var/lib/waagent rw,relatime - squashfs /dev/loop0 ro