File 0897-erts-Make-the-HOME-environment-variable-optional-in-.patch of Package erlang

From a4dfa8d090d7997922fc895951c27b408dd44373 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20de=20Bretagne?=
 <jerome.debretagne@gmail.com>
Date: Fri, 1 Nov 2019 14:54:01 +0100
Subject: [PATCH 1/3] erts: Make the HOME environment variable optional in
 erlexec

Stop the assumption that every operating system or setup has a HOME
directory available (or a similar notion) with a corresponding
environment variable set. This assumption is not always accurate as
raised in ERL-476, for example on Android with its stricter model of
sandboxed applications.
---
 erts/etc/common/erlexec.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/erts/etc/common/erlexec.c b/erts/etc/common/erlexec.c
index 07a66993de..9195441ae4 100644
--- a/erts/etc/common/erlexec.c
+++ b/erts/etc/common/erlexec.c
@@ -267,7 +267,7 @@ static WCHAR *latin1_to_utf16(char *str);
 #endif
 
 /*
- * Needed parameters to be fetched from the environment (Unix)
+ * Parameters to be fetched from the environment (Unix)
  * or the ini file (Win32).
  */
 
@@ -275,7 +275,7 @@ static char* bindir;		/* Location of executables. */
 static char* rootdir;		/* Root location of Erlang installation. */
 static char* emu;		/* Emulator to run. */
 static char* progname;		/* Name of this program. */
-static char* home;		/* Path of user's home directory. */
+static char* home;		/* Path of user's home directory, if any. */
 
 static void
 set_env(char *key, char *value)
@@ -600,7 +600,12 @@ int main(int argc, char **argv)
     i = 1;
 
     get_home();
-    add_args("-home", home, NULL);
+    /* Add the home parameter when available. This is optional to support
+       systems that don't have the notion of a home directory and setups
+       that don't have the HOME environment variable set (ERL-476). */
+    if (home != NULL) {
+        add_args("-home", home, NULL);
+    }
 
     add_epmd_port();
 
@@ -1642,8 +1647,6 @@ static void
 get_home(void)
 {
     home = get_env("HOME");
-    if (home == NULL)
-	error("HOME must be set");
 }
 
 #endif
-- 
2.16.4