1 files changed, 67 insertions, 0 deletions
diff --git a/install-header.sh b/install-header.sh
new file mode 100755
index 0000000..210691d
--- /dev/null
+++ b/install-header.sh
@@ -0,0 +1,67 @@
+#!/usr/bin/env bash
+
+# This is a pre-allocated string of 30 chars of whitespace
+# DO NOT CHANGE THIS without great care - it will break header length
+# calculations
+LENS=(                              )
+export SELF
+export TMP
+
+# Header:    0
+# runscript: 1
+# payload:   2
+extract_chunk_index() {
+  local script="${1}"
+  local dest="${2}"
+  local index="${3}"
+  local skip=0
+
+  for (( i = 0; i < index; i++ )); do
+    skip=$(( skip + LENS[$i] ))
+  done
+
+  # Extract the requested chunk index
+  dd bs=1 count=${LENS[$index]} iflag=skip_bytes skip=${skip} \
+    if=${script} of=${dest} 2>/dev/null
+}
+
+extract_header() {
+  extract_chunk_index "${SELF}" "${TMP}/header.sh" 0
+}
+
+extract_runscript() {
+  extract_chunk_index "${SELF}" "${TMP}/run.sh.xz" 1
+  xz -d "${TMP}/run.sh.xz"
+}
+
+extract_payload() {
+  extract_chunk_index "${SELF}" "${TMP}/payload.tar.xz" 2
+  tar -C "${TMP}" -x -f payload.tar.xz
+}
+
+
+main() {
+  SELF="$(cd $(dirname ${0}) && pwd)/$(basename ${0})"
+  TMP="$(mktemp -d /tmp/installer-XXXXXXX)"
+
+  extract_header
+  extract_runscript
+  #extract_chunks "${self}" "${tmp}"
+
+  cd "${TMP}"
+  source run.sh
+
+  # Function 'deploy' is provided by run.sh
+  if [ "$(type -t deploy)" == 'function' ]; then
+    deploy
+  else
+    printf "ERROR: Deploy function not found.\n"
+  fi
+
+  # Cleanup
+  rm -rf "${TMP}"
+}
+
+main ${@}
+exit 0
+