bug fix: fix mktemp on macos and escaping backslashes on alpine

makeself-header.sh

@@ -24,14 +24,7 @@ scriptargs="$SCRIPTARGS"
 cleanup_script="${CLEANUP_SCRIPT}"
 licensetxt="$LICENSE"
 helpheader="${HELPHEADER}"
-preextract='
-EOF
-if test -n "${PREEXTRACT_FILE}"; then
- sed -e "s/['\\]/\\\\&/g" "${PREEXTRACT_FILE}" >> "$archname"
-fi
-cat << EOF >> "$archname"
-'
-preextract="\${preextract#?}"; preextract="\${preextract%?}" # trim redundant newlines
+preextract="${PREEXTRACT_ENCODED}"
 targetdir="$archdirname"
 filesizes="$filesizes"
 totalsize="$totalsize"
@@ -326,8 +319,8 @@ MS_Preextract()
  fi
  fi
 
- prescript=\`mktemp -t XXXXX -p "\$tmpdir"\`
- echo "\$preextract" > "\$prescript"
+ prescript=\`mktemp "\$tmpdir/XXXXXX"\`
+ echo "\$preextract" | base64 -d > "\$prescript"
  chmod a+x "\$prescript"
 
  (cd "\$tmpdir"; eval "\"\$prescript\" \$scriptargs \"\\\$@\""); res=\$?
@@ -495,7 +488,7 @@ EOLSM
  echo "Pre-extraction script is not provided." >&2
  exit 1
  fi
- echo "\$preextract"
+ echo "\$preextract" | base64 -d
  exit 0
  ;;
  --confirm)

makeself.sh

@@ -313,9 +313,10 @@ do
  shift 2 || { MS_Usage; exit 1; }
  ;;
  --preextract)
- PREEXTRACT_FILE="$2"
+ preextract_file="$2"
  shift 2 || { MS_Usage; exit 1; }
- test -r "$PREEXTRACT_FILE" || { echo "Unable to open pre-extraction script: $PREEXTRACT_FILE" >&2; exit 1; }
+ test -r "$preextract_file" || { echo "Unable to open pre-extraction script: $preextract_file" >&2; exit 1; }
+ PREEXTRACT_ENCODED=`base64 "$preextract_file"`
  ;;
  --cleanup)
  CLEANUP_SCRIPT="$2"