look for config files in standard location on installation

Makefile

@@ -25,6 +25,6 @@ SYSTEMD_DIR = $(DESTDIR)$(PREFIX)/lib/systemd/system
 .PHONY: install
 
 install:
-	@sed -i 's@^SNAPPER_CONFIG.*@SNAPPER_CONFIG='$(SNAPPER_CONFIG)'@g' bin/$(PKGNAME)
+	@./find_snapper_config || sed -i 's@^SNAPPER_CONFIG.*@SNAPPER_CONFIG='$(SNAPPER_CONFIG)'@g' bin/$(PKGNAME)
 	@install -Dm755 bin/* -t $(BIN_DIR)/
 	@install -Dm644 systemd/* -t $(SYSTEMD_DIR)/

README.md

@@ -22,21 +22,8 @@ snapper is required.
 
 ## Installation
 
-Run:
-
     # make install
 
-By default it will look for the snapper configuration file at
-`/etc/sysconfig/snapper`. To change this pass `SNAPPER_CONFIG` to make
-with the location of the configuration file. For example, with Ubuntu
-you will want to install:
-
-    # make SNAPPER_CONFIG=/etc/default/snapper install
-
-For Arch Linux it would be:
-
-    # make SNAPPER_CONFIG=/etc/conf.d/snapper install
-
 The package is available in the [AUR](https://aur.archlinux.org/packages/snap-sync/).
 
 ## Options

bin/snap-sync

@@ -29,8 +29,9 @@ set -o errtrace
 version="0.4"
 name="snap-sync"
 
-# The following line is modified by the Makefile
-SNAPPER_CONFIG=/etc/conf.d/snapper
+# The following line is modified by the Makefile or
+# find_snapper_config script
+SNAPPER_CONFIG=/etc/sysconfig/snapper
 
 TMPDIR=$(mktemp -d)
 PIPE=$TMPDIR/$name.out

find_snapper_config

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+etcdirs="sysconfig default conf.d"
+
+for x in $etcdirs; do
+    d=/etc/$x/snapper
+    if [[ -f $d ]]; then
+	    sed -i 's@^SNAPPER_CONFIG.*@SNAPPER_CONFIG='$d'@g' bin/snap-sync
+        exit 0
+    fi
+done
+
+printf "==> Unable to find snapper configuration file in a standard location.\n"
+printf "==> Using SNAPPER_CONFIG make variable.\n"
+exit 1