Add sync script

sync

@@ -0,0 +1,43 @@
+#!/bin/sh
+
+# usage:
+#
+# sudo ./sync
+# sudo ./sync gentoo
+
+set -eu
+
+REPO="$(dirname "$(realpath "$0")")"
+
+PREFIX="${1:-''}"
+
+sync() {
+    prefix="$1"
+    path="$2"
+
+    if [ -f "$path" ]; then
+        echo cp "$path" "$REPO/$prefix$path"
+             cp "$path" "$REPO/$prefix$path"
+    else
+        echo "Not found: $path"
+    fi
+}
+
+sync common '/etc/tmux.conf'
+sync common '/etc/vim/vimrc.local'
+sync common '/etc/fish/config.fish'
+sync common '/etc/fish/conf.d/rvm.fish'
+sync common '/etc/fish/functions/fish_prompt.fish'
+sync common '/etc/fish/functions/prompt_user_host.fish'
+sync common '/etc/fish/functions/rvm.fish'
+
+if [ "$PREFIX" = 'gentoo' ]; then
+echo
+sync gentoo '/var/lib/portage/world'
+sync gentoo '/etc/portage/make.conf'
+sync gentoo '/etc/portage/package.license'
+sync gentoo '/etc/portage/package.accept_keywords/package.accept_keywords'
+sync gentoo '/etc/portage/package.mask/toolchains'
+sync gentoo '/etc/portage/package.use/toolchains'
+sync gentoo '/etc/portage/package.use/zz-autounmask'
+fi