update os.sh.

platform/os.sh

@@ -8,23 +8,44 @@ fi
 name=$(uname -a)
 os=
 
-if echo "$name" | grep -q -i 'debian'; then
+if echo "$name" | grep -q -i 'cent'; then
+  os=centos
+elif echo "$name" | grep -q -i 'debian'; then
   os=debian
-elif echo "$name" | grep -q 'Ubuntu'; then
-  os=ubuntu
+elif echo "$name" | grep -q -i 'fedora'; then
+  os=fedora
+elif echo "$name" | grep -q -i 'mint'; then
+  os=mint
 elif echo "$name" | grep -q '^Darwin'; then
   os=osx
-elif echo "$name" | grep -q 'ARCH' \
-&& test "$(uname -o 2> /dev/null)" = 'GNU/Linux'; then
+elif echo "$name" | grep -q -i 'redhat'; then
+  os=rhel
+elif echo "$name" | grep -q -i 'suse'; then
+  os=suse
+elif echo "$name" | grep -q 'Ubuntu'; then
+  os=ubuntu
+elif test "$(uname -o 2> /dev/null)" = 'GNU/Linux'; then
   os=arch
 fi
 
+# Maybe someday...
+# if test -d /system && test -d /data/data; then
+#   os=android
+# fi
+
 if test -z "$os"; then
-  echo 'OS not supported.' >& 2
-  exit 1
+  # Arch is hard to detect. Check some unique properties of Arch:
+  if test -d /lib/systemd && test "$(readlink /usr/bin/vi)" = 'ex'; then
+    os=arch
+  else
+    echo 'OS not supported.' >& 2
+    exit 1
+  fi
 fi
 
 if test ! -e platform/${os}/libbitcoind.so; then
+  # Should be doing something like this:
+  # curl -s "https://bitpay.com/lib/libbitcoind-${os}.so" > platform/${os}/libbitcoind.so
   cat platform/${os}/{xaa,xab} > platform/${os}/libbitcoind.so
   chmod 0755 platform/${os}/libbitcoind.so
 fi