From 3df49c2877757d41e8b00adf697735837b8f6c07 Mon Sep 17 00:00:00 2001 From: David Herrmann Date: Mon, 31 Aug 2015 18:07:46 +0200 Subject: login: support user-bus on dbus1 dbus-1.10 was just released, including systemd units to run `dbus-daemon --session` as systemd user unit. This allows using a user-bus with dbus1, just like we do per default with kdbus. All the dbus libraries have already been fixed long ago to use the user-bus as default. Hence, there's no need to set DBUS_SESSION_BUS_ADDRESS= if we use the user-bus. However, gdm and friends continue to spawn a session bus if this variable is not set (instead of checking for the existence of the user-bus). Hence, we force the user-bus, if it is available, in pam_systemd. Once gdm and friends are fixed, we can continue to drop this again. However, that might take a while. With this in place, all that is needed to make the user-bus work is: `systemctl --global enable dbus.socket` If dbus.socket is not enabled, the legacy session-bus is still used. Based on a patch by: Jan Alexander Steffens --- src/login/pam_systemd.c | 35 ++++++++++++++++++++++++----------- xorg/50-systemd-user.sh | 4 ++++ 2 files changed, 28 insertions(+), 11 deletions(-) diff --git a/src/login/pam_systemd.c b/src/login/pam_systemd.c index f83d18b035..71c84d8e0a 100644 --- a/src/login/pam_systemd.c +++ b/src/login/pam_systemd.c @@ -179,24 +179,37 @@ static int export_legacy_dbus_address( const char *runtime) { _cleanup_free_ char *s = NULL; - int r; + int r = PAM_BUF_ERR; - /* skip export if kdbus is not active */ - if (!is_kdbus_available()) - return PAM_SUCCESS; + if (is_kdbus_available()) { + if (asprintf(&s, KERNEL_USER_BUS_ADDRESS_FMT ";" UNIX_USER_BUS_ADDRESS_FMT, uid, runtime) < 0) + goto error; + } else { + /* FIXME: We *realy* should move the access() check into the + * daemons that spawn dbus-daemon, instead of forcing + * DBUS_SESSION_BUS_ADDRESS= here. */ + + s = strjoin(runtime, "/bus", NULL); + if (!s) + goto error; + + if (access(s, F_OK) < 0) + return PAM_SUCCESS; - if (asprintf(&s, KERNEL_USER_BUS_ADDRESS_FMT ";" UNIX_USER_BUS_ADDRESS_FMT, uid, runtime) < 0) { - pam_syslog(handle, LOG_ERR, "Failed to set bus variable."); - return PAM_BUF_ERR; + s = mfree(s); + if (asprintf(&s, UNIX_USER_BUS_ADDRESS_FMT, runtime) < 0) + goto error; } r = pam_misc_setenv(handle, "DBUS_SESSION_BUS_ADDRESS", s, 0); - if (r != PAM_SUCCESS) { - pam_syslog(handle, LOG_ERR, "Failed to set bus variable."); - return r; - } + if (r != PAM_SUCCESS) + goto error; return PAM_SUCCESS; + +error: + pam_syslog(handle, LOG_ERR, "Failed to set bus variable."); + return r; } _public_ PAM_EXTERN int pam_sm_open_session( diff --git a/xorg/50-systemd-user.sh b/xorg/50-systemd-user.sh index f4df13b619..4d49767228 100755 --- a/xorg/50-systemd-user.sh +++ b/xorg/50-systemd-user.sh @@ -1,3 +1,7 @@ #!/bin/sh systemctl --user import-environment DISPLAY XAUTHORITY + +if which dbus-update-activation-environment >/dev/null 2>&1; then + dbus-update-activation-environment DISPLAY XAUTHORITY +fi -- cgit v1.2.3