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54 lines
1.3 KiB
Makefile
54 lines
1.3 KiB
Makefile
# $Id: install-new.mk,v 1.3 2012/03/24 18:25:49 sjg Exp $
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#
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# @(#) Copyright (c) 2009, Simon J. Gerraty
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#
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# This file is provided in the hope that it will
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# be of use. There is absolutely NO WARRANTY.
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# Permission to copy, redistribute or otherwise
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# use this file is hereby granted provided that
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# the above copyright notice and this notice are
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# left intact.
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#
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# Please send copies of changes and bug-fixes to:
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# sjg@crufty.net
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#
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.if !defined(InstallNew)
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# copy if src and target are different making a backup if desired
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CmpCp= CmpCp() { \
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src=$$1 target=$$2 _bak=$$3; \
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if ! test -s $$target || ! cmp -s $$target $$src; then \
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trap "" 1 2 3 15; \
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if test -s $$target; then \
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if test "x$$_bak" != x; then \
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rm -f $$target$$_bak; \
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mv $$target $$target$$_bak; \
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else \
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rm -f $$target; \
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fi; \
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fi; \
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cp $$src $$target; \
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fi; }
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# If the .new file is different, we want it.
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# Note: this function will work as is for *.new$RANDOM"
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InstallNew= ${CmpCp}; InstallNew() { \
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_t=-e; _bak=; \
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while :; do \
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case "$$1" in \
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-?) _t=$$1; shift;; \
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--bak) _bak=$$2; shift 2;; \
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*) break;; \
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esac; \
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done; \
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for new in "$$@"; do \
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if test $$_t $$new; then \
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target=`expr $$new : '\(.*\).new'`; \
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CmpCp $$new $$target $$_bak; \
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fi; \
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rm -f $$new; \
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done; :; }
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.endif
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