weston: Provide a default version of weston-launch that doesn't require PAM

weston-launch requires PAM for starting weston as a non-root user.

Since starting weston as root is a valid use case by itself, we check
the distro for 'pam' and build weston-launch with or without
non-root-user support.

(From OE-Core rev: 6295197adc022445fff01ca5ee75780a4c007d99)

Signed-off-by: Tom Hochstein <tom.hochstein@nxp.com>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 171 insertions, 0 deletions

diff --git a/meta/recipes-graphics/wayland/weston/0001-weston-launch-Provide-a-default-version-that-doesn-t.patch b/meta/recipes-graphics/wayland/weston/0001-weston-launch-Provide-a-default-version-that-doesn-t.patch
new file mode 100644
index 0000000000..9a401ee4b6
--- /dev/null
+++ b/meta/recipes-graphics/wayland/weston/0001-weston-launch-Provide-a-default-version-that-doesn-t.patch
@@ -0,0 +1,171 @@
+From 228349e796e9baa86f2ba8232c730c18ac41283d Mon Sep 17 00:00:00 2001
+From: Tom Hochstein <tom.hochstein@nxp.com>
+Date: Fri, 13 May 2016 09:31:55 -0500
+Subject: [PATCH weston] weston-launch: Provide a default version that doesn't
+ require PAM
+
+weston-launch requires PAM for starting weston as a non-root user.
+
+Since starting weston as root is a valid use case by itself, if
+PAM is not available, provide a default version of weston-launch
+without non-root-user support.
+
+Upstream-Status: Pending
+
+Signed-off-by: Tom Hochstein <tom.hochstein@nxp.com>
+---
+ Makefile.am         |  3 ---
+ configure.ac        | 12 +++++++-----
+ src/weston-launch.c | 20 ++++++++++++++++++++
+ 3 files changed, 27 insertions(+), 8 deletions(-)
+
+Index: weston-1.10.0/configure.ac
+===================================================================
+--- weston-1.10.0.orig/configure.ac     2016-05-13 11:02:05.711817559 -0500
++++ weston-1.10.0/configure.ac  2016-05-13 13:30:28.000000000 -0500
+@@ -445,13 +445,17 @@
+ AS_IF([test "x$have_systemd_login_209" = "xyes"],
+       [AC_DEFINE([HAVE_SYSTEMD_LOGIN_209], [1], [Have systemd-login >= 209])])
+ 
++AC_ARG_WITH(pam,
++            AS_HELP_STRING([--with-pam], [Use PAM]),
++            [use_pam=$withval], [use_pam=yes])
+ AC_ARG_ENABLE(weston-launch, [  --enable-weston-launch],, enable_weston_launch=yes)
+ AM_CONDITIONAL(BUILD_WESTON_LAUNCH, test x$enable_weston_launch == xyes)
+-if test x$enable_weston_launch == xyes; then
++if test x$enable_weston_launch = xyes -a x$use_pam = xyes; then
+   AC_CHECK_LIB([pam], [pam_open_session], [have_pam=yes], [have_pam=no])
+   if test x$have_pam == xno; then
+-    AC_ERROR([weston-launch requires pam])
++    AC_ERROR([PAM support is explicitly requested, but libpam couldn't be found])
+   fi
++  AC_DEFINE([HAVE_PAM], [1], [Define if PAM is available])
+   PAM_LIBS=-lpam
+   AC_SUBST(PAM_LIBS)
+ fi
+@@ -667,6 +671,7 @@
+        Enable developer documentation  ${enable_devdocs}
+ 
+        weston-launch utility           ${enable_weston_launch}
++       PAM support                     ${use_pam}
+        systemd-login support           ${have_systemd_login}
+        systemd notify support          ${enable_systemd_notify}
+ 
+Index: weston-1.10.0/src/weston-launch.c
+===================================================================
+--- weston-1.10.0.orig/src/weston-launch.c      2016-05-13 11:02:05.779817896 -0500
++++ weston-1.10.0/src/weston-launch.c   2016-05-13 11:02:05.851818253 -0500
+@@ -51,7 +51,9 @@
+ 
+ #include <pwd.h>
+ #include <grp.h>
++#ifdef HAVE_PAM
+ #include <security/pam_appl.h>
++#endif
+ 
+ #ifdef HAVE_SYSTEMD_LOGIN
+ #include <systemd/sd-login.h>
+@@ -93,8 +95,10 @@
+ #endif
+ 
+ struct weston_launch {
++#ifdef HAVE_PAM
+        struct pam_conv pc;
+        pam_handle_t *ph;
++#endif
+        int tty;
+        int ttynr;
+        int sock[2];
+@@ -181,6 +185,7 @@
+        return false;
+ }
+ 
++#ifdef HAVE_PAM
+ static int
+ pam_conversation_fn(int msg_count,
+                    const struct pam_message **messages,
+@@ -221,6 +226,7 @@
+ 
+        return 0;
+ }
++#endif
+ 
+ static int
+ setup_launcher_socket(struct weston_launch *wl)
+@@ -414,6 +420,7 @@
+        close(wl->signalfd);
+        close(wl->sock[0]);
+ 
++#ifdef HAVE_PAM
+        if (wl->new_user) {
+                err = pam_close_session(wl->ph, 0);
+                if (err)
+@@ -421,6 +428,7 @@
+                                err, pam_strerror(wl->ph, err));
+                pam_end(wl->ph, err);
+        }
++#endif
+ 
+        if (ioctl(wl->tty, KDSKBMUTE, 0) &&
+            ioctl(wl->tty, KDSKBMODE, wl->kb_mode))
+@@ -600,6 +608,7 @@
+        setenv("HOME", wl->pw->pw_dir, 1);
+        setenv("SHELL", wl->pw->pw_shell, 1);
+ 
++#ifdef HAVE_PAM
+        env = pam_getenvlist(wl->ph);
+        if (env) {
+                for (i = 0; env[i]; ++i) {
+@@ -608,6 +617,7 @@
+                }
+                free(env);
+        }
++#endif
+ }
+ 
+ static void
+@@ -665,7 +675,9 @@
+ help(const char *name)
+ {
+        fprintf(stderr, "Usage: %s [args...] [-- [weston args..]]\n", name);
++#ifdef HAVE_PAM
+        fprintf(stderr, "  -u, --user      Start session as specified username\n");
++#endif
+        fprintf(stderr, "  -t, --tty       Start session on alternative tty\n");
+        fprintf(stderr, "  -v, --verbose   Be verbose\n");
+        fprintf(stderr, "  -h, --help      Display this help message\n");
+@@ -678,7 +690,9 @@
+        int i, c;
+        char *tty = NULL;
+        struct option opts[] = {
++#ifdef HAVE_PAM
+                { "user",    required_argument, NULL, 'u' },
++#endif
+                { "tty",     required_argument, NULL, 't' },
+                { "verbose", no_argument,       NULL, 'v' },
+                { "help",    no_argument,       NULL, 'h' },
+@@ -690,9 +704,13 @@
+        while ((c = getopt_long(argc, argv, "u:t::vh", opts, &i)) != -1) {
+                switch (c) {
+                case 'u':
++#ifdef HAVE_PAM
+                        wl.new_user = optarg;
+                        if (getuid() != 0)
+                                error(1, 0, "Permission denied. -u allowed for root only");
++#else
++                       error(1, 0, "-u is unsupported in this weston-launch build");
++#endif
+                        break;
+                case 't':
+                        tty = optarg;
+@@ -730,8 +748,10 @@
+        if (setup_tty(&wl, tty) < 0)
+                exit(EXIT_FAILURE);
+ 
++#ifdef HAVE_PAM
+        if (wl.new_user && setup_pam(&wl) < 0)
+                exit(EXIT_FAILURE);
++#endif
+ 
+        if (setup_launcher_socket(&wl) < 0)
+                exit(EXIT_FAILURE);