Initial commit

.github/shared.sh

@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+
+# return sha256sum for file
+# $1 - filename (string)
+function get_sha256sum()
+{
+  sha256sum "$1" | head -c 64
+}
+
+# Replaceable file
+#
+# $1 - filename (string)
+# $2 - filename (string)
+#
+# Returns 1 when replaceable, 0 when not replaceable.
+function replaceable()
+{
+  FILE1="$1"
+  FILE2="$2"
+
+  [[ ! -r "$FILE1" ]] && {
+    [[ $VERBOSE -eq 1 ]] && msg_err "File 1 ($FILE1) does not exist"
+    return 0
+  }
+  [[ ! -r "$FILE2" ]] && {
+    [[ $VERBOSE -eq 1 ]] && msg_err "File 2 ($FILE2) does not exist, replaceable"
+    return 1
+  }
+
+  FILE1_HASH=$(get_sha256sum "$FILE1")
+  FILE2_HASH=$(get_sha256sum "$FILE2")
+
+  [[ $FILE1_HASH = "" ]] && {
+    [[ $VERBOSE -eq 1 ]] && msg_err "Could not get hash for file 1 ($FILE1)"
+    return 0
+  }
+  [[ $FILE2_HASH = "" ]] && {
+    [[ $VERBOSE -eq 1 ]] && msg_err "Could not get hash for file 2 ($FILE2), replaceable"
+    return 1
+  }
+
+  [[ "$FILE1_HASH" == "$FILE2_HASH" ]] && {
+    [[ $VERBOSE -eq 1 ]] && msg_ok "Files match, not replaceable: $FILE1"
+    return 0
+  }
+
+  [[ $VERBOSE -eq 1 ]] && msg_warn "Files do not match ($FILE1_HASH != $FILE2_HASH), replaceable"
+
+  return 1
+}