better checks for OS.

platform/os.sh

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+exec 2> /dev/null
+
 if test x"$1" = x'btcdir'; then
   if test -n "$BITCOIN_DIR"; then
     echo "$BITCOIND_DIR"
@@ -11,42 +13,51 @@ if test x"$1" = x'btcdir'; then
   exit 0
 fi
 
-name=$(uname -a)
 os=
 
-if echo "$name" | grep -q -i 'cent'; then
+if test -f /etc/centos-release \
+  || grep -q 'CentOS' /etc/redhat-release \
+  || rpm -q --queryformat '%{VERSION}' centos-release > /dev/null; then
   os=centos
-elif echo "$name" | grep -q -i 'debian'; then
-  os=debian
-elif echo "$name" | grep -q -i 'fedora'; then
+elif grep -q 'Fedora' /etc/system-release; then
   os=fedora
-elif echo "$name" | grep -q -i 'mint'; then
-  os=mint
-elif echo "$name" | grep -q '^Darwin'; then
+elif uname -a | grep -q '^Darwin'; then
   os=osx
-elif echo "$name" | grep -q -i 'redhat'; then
+elif test -f /etc/redhat_release \
+  || test -f /etc/redhat-release; then
   os=rhel
-elif echo "$name" | grep -q -i 'suse'; then
+elif test -f /etc/SuSE-release; then
   os=suse
-elif echo "$name" | grep -q 'Ubuntu'; then
+elif test -f /etc/mandrake-release \
+  || test -f /etc/mandriva-release; then
+  os=mandriva
+elif grep -q 'Ubuntu' /etc/issue \
+  || grep -q 'Ubuntu' /etc/lsb-release \
+  || uname -v | grep -q 'Ubuntu'; then
   os=ubuntu
-elif test "$(uname -o 2> /dev/null)" = 'GNU/Linux'; then
+elif grep -q 'Linux Mint' /etc/issue; then
+  os=mint
+elif test -f /etc/debian_version \
+  || test -f /etc/debian-version; then
+  os=debian
+elif grep -q 'Arch Linux' /etc/issue \
+  || test -d /lib/systemd -a "$(readlink /usr/bin/vi)" = 'ex'; then
   os=arch
+elif test "$(uname -s)" = 'SunOS'; then
+  os=solaris
+elif test "$(uname -s)" = 'AIX'; then
+  os=aix
+elif test -d /system && test -d /data/data; then
+  os=android
 fi
 
-# Maybe someday...
-# if test -d /system && test -d /data/data; then
-#   os=android
-# fi
-
-if test -z "$os"; then
-  # Arch is hard to detect. Check some unique properties of Arch:
-  if test -d /lib/systemd && test "$(readlink /usr/bin/vi)" = 'ex'; then
-    os=arch
-  else
-    echo 'OS not supported.' >& 2
-    exit 1
+if test -z "$os" -o "$os" = 'android'; then
+  # Maybe someday...
+  if test "$os" = 'android' -o "$os" = 'aix'; then
+    echo 'Android or AIX detected!' >& 2
   fi
+  echo 'OS not supported.' >& 2
+  exit 1
 fi
 
 if test x"$1" = x'osdir'; then