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 # If the .new file is different, we want it.
  36 # Note: this function will work as is for *.new$RANDOM"
  37 InstallNew= ${CmpCp}; InstallNew() { \
  38         _t=-e; _bak=; \
  39         while :; do \
  40                 case "$$1" in \
  41                 -?) _t=$$1; shift;; \
  42                 --bak) _bak=$$2; shift 2;; \
  43                 *) break;; \
  44                 esac; \
  45         done; \
  46         for new in "$$@"; do \
  47                 if test $$_t $$new; then \
  48                         target=`expr $$new : '\(.*\).new'`; \
  49                         CmpCp $$new $$target $$_bak; \
  50                 fi; \
  51                 rm -f $$new; \
  52         done; :; }
  53
  54 .endif