I could reproduce this problem using 18.04.3 live CD using Slack and
Atom. However, I don't think the problem is caused by snapd.
Slack, Skype and Atom are all classic snaps so they have full access to
the system. With Slack installed, clicking on the 'get started' link was
enough to get another Firefox window open. I collected the strace log. A
relevant piece is here:
10782 execve("/usr/local/sbin/xdg-open", ["xdg-open",
"https://slack.com/ssb/add";], 0xb6c9467b000 /* 75 vars */) = -1 ENOENT (No such
file or directory)
10782 execve("/usr/local/bin/xdg-open", ["xdg-open",
"https://slack.com/ssb/add";], 0xb6c9467b000 /* 75 vars */) = -1 ENOENT (No such
file or directory)
10782 execve("/usr/sbin/xdg-open", ["xdg-open", "https://slack.com/ssb/add";],
0xb6c9467b000 /* 75 vars */) = -1 ENOENT (No such file or directory)
10782 execve("/usr/bin/xdg-open", ["xdg-open", "https://slack.com/ssb/add";],
0xb6c9467b000 /* 75 vars */) = 0
10784 execve("/usr/bin/which", ["which",
"gnome-default-applications-prope"...], 0x560d5fb594a8 /* 75 vars */) = 0
10784 +++ exited with 1 +++
10782 --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=10784,
si_uid=999, si_status=1, si_utime=0, si_stime=0} ---
10785 execve("/usr/bin/gio", ["gio", "help", "open"], 0x560d5fb594a8 /* 75 vars
*/) = 0
10785 +++ exited with 0 +++
10782 --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=10785,
si_uid=999, si_status=0, si_utime=0, si_stime=0} ---
10786 execve("/usr/bin/gio", ["gio", "open", "https://slack.com/ssb/add";],
0x560d5fb594a8 /* 75 vars */) = 0
10789 +++ exited with 0 +++
10786 --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=10789,
si_uid=999, si_status=0, si_utime=0, si_stime=0} ---
10790 execve("/usr/local/sbin/firefox", ["firefox",
"https://slack.com/ssb/add";], 0x563485f1c6e0 /* 77 vars */) = -1 ENOENT (No
such file or directory)
10790 execve("/usr/local/bin/firefox", ["firefox",
"https://slack.com/ssb/add";], 0x563485f1c6e0 /* 77 vars */) = -1 ENOENT (No
such file or directory)
10790 execve("/usr/sbin/firefox", ["firefox", "https://slack.com/ssb/add";],
0x563485f1c6e0 /* 77 vars */) = -1 ENOENT (No such file or directory)
10790 execve("/usr/bin/firefox", ["firefox", "https://slack.com/ssb/add";],
0x563485f1c6e0 /* 77 vars */) = 0
10791 +++ exited with 0 +++
Notice how slack attempts to run xdg-open (and does so successfully at
some point), then it proceeds to run `gio open ..`, and again does that
successfully, finally it just runs firefox with the URL. I believe this
is what triggers the new window to appear.
Another observation for Slack on 18.04 is that gnome-shell groups the
Firefox window *with* the slack one.
I tried diffing the environment between the inside and outside of snap:
--- in-shell 2019-10-17 13:43:59.474529198 +0000
+++ in-snap-shell 2019-10-17 13:44:09.186624002 +0000
@@ -2,13 +2,14 @@ CLUTTER_IM_MODULE=xim
COLORTERM=truecolor
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/999/bus
DESKTOP_SESSION=ubuntu
+DISABLE_WAYLAND=1
DISPLAY=:0
GDMSESSION=ubuntu
GJS_DEBUG_OUTPUT=stderr
GJS_DEBUG_TOPICS=JS ERROR;JS LOG
GNOME_DESKTOP_SESSION_ID=this-is-deprecated
GNOME_SHELL_SESSION_MODE=ubuntu
-GNOME_TERMINAL_SCREEN=/org/gnome/Terminal/screen/113b5986_bfcc_47c1_8317_a37a7600b396
+GNOME_TERMINAL_SCREEN=/org/gnome/Terminal/screen/d399bea3_fa8f_4330_842a_0eaaac439533
GNOME_TERMINAL_SERVICE=:1.143
GPG_AGENT_INFO=/run/user/999/gnupg/S.gpg-agent:0:1
GTK_IM_MODULE=ibus
@@ -27,7 +28,22 @@ QT_ACCESSIBILITY=1
QT_IM_MODULE=ibus
SESSION_MANAGER=local/ubuntu:@/tmp/.ICE-unix/4000,unix/ubuntu:/tmp/.ICE-unix/4000
SHELL=/bin/bash
-SHLVL=1
+SHLVL=2
+SNAP_ARCH=amd64
+SNAP_COMMON=/var/snap/atom/common
+SNAP_CONTEXT=yBpkxSLRYnnStMxl74JWW8f6GLLQDXlD6qC2rdmXVjsh
+SNAP_COOKIE=yBpkxSLRYnnStMxl74JWW8f6GLLQDXlD6qC2rdmXVjsh
+SNAP_DATA=/var/snap/atom/238
+SNAP_INSTANCE_KEY=
+SNAP_INSTANCE_NAME=atom
+SNAP_LIBRARY_PATH=/var/lib/snapd/lib/gl:/var/lib/snapd/lib/gl32:/var/lib/snapd/void
+SNAP_NAME=atom
+SNAP_REEXEC=
+SNAP_REVISION=238
+SNAP=/snap/atom/238
+SNAP_USER_COMMON=/home/ubuntu/snap/atom/common
+SNAP_USER_DATA=/home/ubuntu/snap/atom/238
+SNAP_VERSION=1.40.1
SSH_AGENT_PID=4095
SSH_AUTH_SOCK=/run/user/999/keyring/ssh
TERM=xterm-256color
@@ -43,7 +59,7 @@ XDG_CONFIG_DIRS=/etc/xdg/xdg-ubuntu:/etc
XDG_CURRENT_DESKTOP=ubuntu:GNOME
XDG_DATA_DIRS=/usr/share/ubuntu:/usr/local/share:/usr/share:/var/lib/snapd/desktop
XDG_MENU_PREFIX=gnome-
-XDG_RUNTIME_DIR=/run/user/999
+XDG_RUNTIME_DIR=/run/user/999/snap.atom
XDG_SEAT=seat0
XDG_SESSION_DESKTOP=ubuntu
XDG_SESSION_ID=2
However I could still spawn a separate Firefox window using a simple
`gio open http://<url>`.
I've proceeded to install Chromium and set it to be my default browser.
At this point all the links and xdg-open calls I tried would open a new
tab in the current Chromium window.
Perhaps the problem is actually with Firefox and the method it uses to
find out whether there's antoher instance already running.
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https://bugs.launchpad.net/bugs/1835024
Title:
Links triggered within most snap apps open in a separate browser
session
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