share/mk/install-new.mk

   1 # $FreeBSD$
   2 # $Id: install-new.mk,v 1.3 2012/03/24 18:25:49 sjg Exp $
   3 #
   4 #       @(#) Copyright (c) 2009, Simon J. Gerraty
   5 #
   6 #       This file is provided in the hope that it will
   7 #       be of use.  There is absolutely NO WARRANTY.
   8 #       Permission to copy, redistribute or otherwise
   9 #       use this file is hereby granted provided that
  10 #       the above copyright notice and this notice are
  11 #       left intact.
  12 #
  13 #       Please send copies of changes and bug-fixes to:
  14 #       sjg@crufty.net
  15 #
  16
  17 .if !defined(InstallNew)
  18
  19 # copy if src and target are different making a backup if desired
  20 CmpCp= CmpCp() { \
  21         src=$$1 target=$$2 _bak=$$3; \
  22         if ! test -s $$target || ! cmp -s $$target $$src; then \
  23                 trap "" 1 2 3 15; \
  24                 if test -s $$target; then \
  25                         if test "x$$_bak" != x; then \
  26                                 rm -f $$target$$_bak; \
  27                                 mv $$target $$target$$_bak; \
  28                         else \
  29                                 rm -f $$target; \
  30                         fi; \
  31                 fi; \
  32                 cp $$src $$target; \
  33         fi; }
  34
  35 # Replace the file if they are different and make a backup if desired
  36 CmpReplace= CmpReplace() { \
  37         src=$$1 target=$$2 _bak=$$3; \
  38         if ! test -s $$target || ! cmp -s $$target $$src; then \
  39                 trap "" 1 2 3 15; \
  40                 if test -s $$target; then \
  41                         if test "x$$_bak" != x; then \
  42                                 rm -f $$target$$_bak; \
  43                                 cp -f $$target $$target$$_bak; \
  44                         fi; \
  45                 fi; \
  46                 mv -f $$src $$target; \
  47         fi; }
  48
  49 # If the .new file is different, we want it.
  50 # Note: this function will work as is for *.new$RANDOM"
  51 InstallNew= ${CmpReplace}; InstallNew() { \
  52         _t=-e; _bak=; \
  53         while :; do \
  54                 case "$$1" in \
  55                 -?) _t=$$1; shift;; \
  56                 --bak) _bak=$$2; shift 2;; \
  57                 *) break;; \
  58                 esac; \
  59         done; \
  60         for new in "$$@"; do \
  61                 if test $$_t $$new; then \
  62                         target=`expr $$new : '\(.*\).new'`; \
  63                         CmpReplace $$new $$target $$_bak; \
  64                 fi; \
  65                 rm -f $$new; \
  66         done; :; }
  67
  68 .endif