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{ stdenv, xorgserver }:
# !!! What does this package do, and does it belong in Nixpkgs?
stdenv.mkDerivation {
name = "xlaunch";
inherit xorgserver;
buildCommand = "
cat << EOF > realizeuid.c
#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
int main(int argc, char ** argv, char ** envp)
{
uid_t a,b,c;
int i;
char *nargv[10000];
char arg1 [10];
nargv[0]=argv[0];
for (i=1; i<=argc; i++){
nargv[i+1]=argv[i];
}
nargv[1]=arg1;
getresuid (&a,&b,&c);
snprintf(arg1,8,\"%d\",a);
setresuid(c,c,c);
execve(\"\$out/libexec/xlaunch\", nargv, envp);
}
EOF
mkdir -p \$out/bin
mkdir -p \$out/libexec
gcc realizeuid.c -o \$out/bin/xlaunch
echo '#! ${stdenv.shell}
USER=\$(egrep '\\''^[-a-z0-9A-Z_]*:[^:]*:'\\''\$1'\\'':'\\'' /etc/passwd | sed -e '\\''s/:.*//'\\'' )
shift
case \"\$1\" in
:*) export _display=\"\$1\";
shift
esac
_display=\${_display:-:0}
_display=\${_display#:}
echo Using :\$_display
if [ -n \"\$DO_X_RESET\" ]; then
RESET_OPTION=\"-once\"
else
RESET_OPTION=\"-noreset\"
fi;
XCMD=\"\$(egrep \"^Environment=\" /etc/systemd/system/display-manager.service | sed -e \"s/Environment=/ export /\" | sed -e '\\''s/#.*//'\\'' ; echo export _XARGS_=\\\$\\( grep xserver_arguments \\\$SLIM_CFGFILE \\| sed -e s/xserver_arguments// \\| sed -e s/:0/:\${_display}/ \\| sed -e s/vt7/vt\$((7+_display))/ \\) ; echo ${xorgserver.out}/bin/X \\\$_XARGS_ \$RESET_OPTION )\"
PRE_XCMD=\"\$(egrep \"^ExecStartPre=\" /etc/systemd/system/display-manager.service | sed -e \"\s/ExecStartPre=//\")\"
echo \"\$PRE_XCMD\"
echo \"\$PRE_XCMD\" | bash
echo \"\$XCMD\"
echo \"\$XCMD\" | bash &
while ! test -e /tmp/.X11-unix/X\$_display &>/dev/null ; do sleep 0.5; done
su -l \${USER:-identityless-shelter} -c \"DISPLAY=:\$_display \$*\";
' >\$out/libexec/xlaunch
chmod a+x \$out/libexec/xlaunch
";
meta = {
description = ''Wrapper to parse NixOS-specific X environment and launch a custom X session'';
maintainers = [ stdenv.lib.maintainers.raskin ];
};
}
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