Public bug reported:
The debian/Xsession script (presumably overriding the one used by
upstream) re-execs itself with the user's $SHELL and, depending on the
concrete shell type, sources some login and profile scripts. Then it
sources /etc/X11/Xsession, which in turn sources the scripts in
/etc/X11/Xsession.d.
In the particular case when $SHELL is zsh, debian/Xsession currently
does the following:
[ -z "$ZSH_NAME" ] && exec $SHELL $0 "$@"
emulate -R zsh
[ -d /etc/zsh ] && zdir=/etc/zsh || zdir=/etc
zhome=${ZDOTDIR:-$HOME}
# zshenv is always sourced automatically.
[ -f $zdir/zprofile ] && . $zdir/zprofile
[ -f $zhome/.zprofile ] && . $zhome/.zprofile
[ -f $zdir/zlogin ] && . $zdir/zlogin
[ -f $zhome/.zlogin ] && . $zhome/.zlogin
setopt shwordsplit noextendedglob
which means that scripts in /etc/X11/Xsession.d are sourced as zsh,
contrary to what's mentioned in most of them, namely that they are
sourced by Xsession(5), which "is a Bourne shell (sh(1)) script"
(according the the manpage).
In many of these scripts, the following idiom is applied:
SOMEVAR=$SOMEVAR:somevalue
When this is parsed by zsh, the $VAR:x construct is interpreted as the
value held in $VAR with modifier x. If this idiom were to be used in
zsh, it would have to be written as
SOMEVAR=${SOMEVAR}:somevalue
in order to prevent the first letter of somevalue to be interpreted as a
modifier.
Since the Xsession.d scripts are meant to be interpreted as Bourne
scripts, zsh should be set in Bourne shell compatibility mode before
sourcing /etc/X11/Xsession (by adding 'emulate -R sh' as the last
command in the compound-list), or maybe instead of sourcing
/etc/X11/Xsession, the script should exec it.
** Affects: sddm (Ubuntu)
Importance: Undecided
Status: New
** Tags: exec source xsession zsh
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https://bugs.launchpad.net/bugs/2108975
Title:
SDDM's custom Xsession dealing with zsh
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