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syncab: add option to sort of ignore mtimes

necessary for stupid media which stupidly screws them up

--- a/syncab

+++ b/syncab

@@ -1,7 +1,12 @@

 #!/bin/rc

 rfork n

+nomtime=0

+if(~ $1 -m){

+	nomtime=1

+	shift

+}

 if(! ~ $#* 2){

-	echo usage: $0 left right

+	echo usage: $0 [-m] left right

 	exit usage

 }

@@ -12,14 +17,17 @@

 	-F'	' \

 	-v 'ref='^$ref \

 	-v 'old='^$old \

+	-v 'nomtime='^$nomtime \

 '

 BEGIN{

 	rm["na"] = rm["dn"] = rm["dm!"] = 1

+	if(nomtime)

+		nocp["nm"] = 1

 }

 {

 	if($1 in rm)

 		ls["rm"] = "''" old "/" $2 "'' " ls["rm"]

-	else

+	else if(! ($1 in nocp))

 		ls["cp"] = ls["cp"] " " "''" $2 "''"

 	cnt[$1]++

 }