termux-tools: do not print motd on OpenSSH login when config PrintMotd=no

Now OpenSSH will not print motd on its own which may result in duplicate.
Instead it will control the login script via environment variable.

Fixes https://github.com/termux/termux-packages/issues/3941.

packages/openssh/build.sh

@@ -2,7 +2,7 @@ TERMUX_PKG_HOMEPAGE=https://www.openssh.com/
 TERMUX_PKG_DESCRIPTION="Secure shell for logging into a remote machine"
 TERMUX_PKG_LICENSE="BSD"
 TERMUX_PKG_VERSION=8.0p1
-TERMUX_PKG_REVISION=3
+TERMUX_PKG_REVISION=4
 TERMUX_PKG_SHA256=bd943879e69498e8031eb6b7f44d08cdc37d59a7ab689aa0b437320c3481fd68
 TERMUX_PKG_SRCURL=https://fastly.cdn.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-${TERMUX_PKG_VERSION}.tar.gz
 TERMUX_PKG_DEPENDS="libandroid-support, ldns, openssl, libedit, libutil, termux-auth, krb5, zlib"
@@ -68,9 +68,8 @@ termux_step_post_configure() {
 }
 
 termux_step_post_make_install() {
-	# "PrintMotd no" is due to our login program already showing it.
 	# OpenSSH 7.0 disabled ssh-dss by default, keep it for a while in Termux:
-	echo -e "PrintMotd no\nPasswordAuthentication yes\nPubkeyAcceptedKeyTypes +ssh-dss\nSubsystem sftp $TERMUX_PREFIX/libexec/sftp-server" > $TERMUX_PREFIX/etc/ssh/sshd_config
+	echo -e "PrintMotd yes\nPasswordAuthentication yes\nPubkeyAcceptedKeyTypes +ssh-dss\nSubsystem sftp $TERMUX_PREFIX/libexec/sftp-server" > $TERMUX_PREFIX/etc/ssh/sshd_config
 	printf "PubkeyAcceptedKeyTypes +ssh-dss\nSendEnv LANG\n" > $TERMUX_PREFIX/etc/ssh/ssh_config
 	install -Dm700 $TERMUX_PKG_BUILDER_DIR/source-ssh-agent.sh $TERMUX_PREFIX/bin/source-ssh-agent
 	install -Dm700 $TERMUX_PKG_BUILDER_DIR/ssh-with-agent.sh $TERMUX_PREFIX/bin/ssha

packages/openssh/session.c.patch

@@ -1,6 +1,6 @@
-diff -u -r ../openssh-8.0p1/session.c ./session.c
+diff -uNr openssh-8.0p1/session.c openssh-8.0p1.mod/session.c
---- ../openssh-8.0p1/session.c	2019-04-17 22:52:57.000000000 +0000
+--- openssh-8.0p1/session.c	2019-04-18 01:52:57.000000000 +0300
-+++ ./session.c	2019-04-18 06:48:19.351575794 +0000
++++ openssh-8.0p1.mod/session.c	2019-09-06 01:41:30.581023746 +0300
 @@ -197,7 +197,7 @@
  	temporarily_use_uid(pw);
  
@@ -19,16 +19,34 @@ diff -u -r ../openssh-8.0p1/session.c ./session.c
  	if ((fd = mkstemp(auth_info_file)) == -1) {
  		error("%s: mkstemp: %s", __func__, strerror(errno));
  		goto out;
-@@ -803,7 +803,7 @@
+@@ -799,6 +799,11 @@
+ 	char buf[256];
+ 
+ 	if (options.print_motd) {
++#ifdef __ANDROID__
++		// Normally this environment variable should be already unset, but
++		// doing this anyway.
++		unsetenv("TERMUX_HUSHLOGIN");
++#else
+ #ifdef HAVE_LOGIN_CAP
  		f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
  		    "/etc/motd"), "r");
- #else
+@@ -810,7 +815,14 @@
--		f = fopen("/etc/motd", "r");
+ 				fputs(buf, stdout);
-+		f = fopen("@TERMUX_PREFIX@/etc/motd", "r");
+ 			fclose(f);
- #endif
+ 		}
- 		if (f) {
++#endif
- 			while (fgets(buf, sizeof(buf), f))
+ 	}
-@@ -1052,11 +1052,13 @@
++#ifdef __ANDROID__
++	else {
++		// Tell Termux login script not to display motd.
++		setenv("TERMUX_HUSHLOGIN", "1", 1);
++	}
++#endif
+ }
+ 
+ 
+@@ -1052,11 +1064,13 @@
  # endif /* HAVE_CYGWIN */
  #endif /* HAVE_LOGIN_CAP */
  
@@ -42,12 +60,12 @@ diff -u -r ../openssh-8.0p1/session.c ./session.c
  
  	/* Normal systems set SHELL by default. */
  	child_set_env(&env, &envsize, "SHELL", shell);
-@@ -1100,6 +1102,15 @@
+@@ -1100,6 +1114,15 @@
  		    auth_sock_name);
  
  
 +#ifdef __ANDROID__
-+	char const* envs_to_keep[] = {"LD_LIBRARY_PATH", "PATH", "ANDROID_ROOT", "ANDROID_DATA", "EXTERNAL_STORAGE", "LANG", "PREFIX", "TMPDIR"};
++	char const* envs_to_keep[] = {"LD_LIBRARY_PATH", "PATH", "ANDROID_ROOT", "ANDROID_DATA", "EXTERNAL_STORAGE", "LANG", "PREFIX", "TERMUX_HUSHLOGIN", "TMPDIR"};
 +	for (i = 0; i < (sizeof(envs_to_keep) / sizeof(envs_to_keep[0])); i++) {
 +		char const* env_to_keep_name = envs_to_keep[i];
 +		char const* env_to_keep_value = getenv(env_to_keep_name);

packages/termux-tools/build.sh

@@ -1,7 +1,7 @@
 TERMUX_PKG_HOMEPAGE=https://termux.com/
 TERMUX_PKG_DESCRIPTION="Basic system tools for Termux"
 TERMUX_PKG_LICENSE="GPL-3.0"
-TERMUX_PKG_VERSION=0.69
+TERMUX_PKG_VERSION=0.70
 TERMUX_PKG_SKIP_SRC_EXTRACT=true
 TERMUX_PKG_PLATFORM_INDEPENDENT=true
 TERMUX_PKG_ESSENTIAL=true

packages/termux-tools/login

@@ -1,7 +1,10 @@
 #!/data/data/com.termux/files/usr/bin/sh
 
-if [ $# = 0 ] && [ -f $PREFIX/etc/motd ] && [ ! -f ~/.hushlogin ]; then
+if [ $# = 0 ] && [ -f $PREFIX/etc/motd ] && [ ! -f ~/.hushlogin ] && [ -z "$TERMUX_HUSHLOGIN" ]; then
 	cat $PREFIX/etc/motd
+else
+	# This variable shouldn't be kept set.
+	unset TERMUX_HUSHLOGIN
 fi
 
 if [ -G ~/.termux/shell ]; then