Thanks, The problem was, indeed, a fail in the path to a library. Your answers were key to solve it. The dlopen() now works ok.
On 03/02/17 13:59, Mark Shuttleworth wrote: > On 03/02/17 12:41, Loïc Minier wrote: >> In classic mode, you see libraries from your classic Ubuntu system >> including X11; in devmode/confined mode, you only see system libraries >> from the core snap which doesn't contain X11. > > One more point. If you try this command you will be running a shell > "inside the snap", in other words, you will be experiencing the > filesystem exactly as your snap sees it. > > $ snap run --shell <snap> > > Now you are living inside the container that is setup just for that > snap. It's using the same sorts of mechanisms as LXD and Docker to keep > processes apart, but it is also setup in such a way that files can be > shared across snaps. You can see the environment variables that snapd > has setup so snap processes can find out where they can write data etc: > > $ set | grep SNAP > SNAP=/snap/etcd/x5 > SNAP_ARCH=amd64 > SNAP_COMMON=/var/snap/etcd/common > SNAP_DATA=/var/snap/etcd/x5 > SNAP_LIBRARY_PATH=/var/lib/snapd/lib/gl: > SNAP_NAME=etcd > SNAP_REEXEC= > SNAP_REVISION=x5 > SNAP_USER_COMMON=/home/mark/snap/etcd/common > SNAP_USER_DATA=/home/mark/snap/etcd/x5 > SNAP_VERSION=2.3.7 > > And if you start using 'ls' to poke around the filesystem, you quickly > see that you are in your own special world: > > $ ls / > ls: cannot open directory '/': Permission denied > > $ sudo ls / > bash: /usr/bin/sudo: Permission denied > > $ ls -l /lib/ > total 74 > drwxr-xr-x 2 root root 52 Jan 13 20:41 apparmor > drwxr-xr-x 2 root root 57 Jan 13 20:41 bridge-utils > drwxr-xr-x 2 root root 40 Jan 13 20:41 cgmanager > drwxr-xr-x 3 root root 89 Jan 13 20:41 crda > drwxr-xr-x 2 root root 3 Jan 13 20:40 firmware > drwxr-xr-x 2 root root 1032 Jan 13 20:41 i386-linux-gnu > drwxr-xr-x 2 root root 59 Jan 13 20:41 ifupdown > drwxr-xr-x 2 root root 51 Jan 13 20:41 init > -rwxr-xr-x 1 root root 70952 Sep 22 18:34 > klibc-k3La8MUnuzHQ0_kG8hokcGAC0PA.so > lrwxrwxrwx 1 root root 25 Nov 16 22:51 ld-linux.so.2 -> > i386-linux-gnu/ld-2.23.so > drwxr-xr-x 3 root root 61 Jan 13 20:41 lsb > drwxr-xr-x 2 root root 35 Jan 13 20:41 modprobe.d > drwxr-xr-x 6 root root 4096 Jan 26 10:15 modules > drwxr-xr-x 2 root root 31 Jan 13 20:41 netplan > drwxr-xr-x 2 root root 35 Jan 13 20:41 resolvconf > drwxr-xr-x 8 root root 1057 Jan 13 20:41 systemd > drwxr-xr-x 15 root root 132 Jan 13 20:41 terminfo > drwxr-xr-x 4 root root 298 Jan 13 20:41 udev > drwxr-xr-x 3 root root 4281 Jan 13 20:41 x86_64-linux-gnu > drwxr-xr-x 2 root root 2531 Jan 13 20:41 xtables > > So you see, this is a super-minimal "core" with just a few libraries. > > You can find your snap at $SNAP: > > $ echo $SNAP > /snap/foo/7 > $ ls -lR $SNAP > /snap/foo/x5: > ... <your snap tree here> > > Hope that's a useful introduction. It's a lot of fun once you realise > that you have TOTAL control over your snap, but everything else is very > structured for you. > > Mark > > > -- Snapcraft mailing list Snapcraft@lists.snapcraft.io Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/snapcraft
