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mkimage-alpine.sh: Allow to change ARCH from the environment

Signed-off-by: Manfred Touron <m@42.am>

Manfred Touron authored on 2015/02/13 21:37:21
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@@ -72,7 +72,7 @@ REL=${REL:-edge}
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 MIRROR=${MIRROR:-http://nl.alpinelinux.org/alpine}
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 SAVE=${SAVE:-0}
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 REPO=$MIRROR/$REL/main
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-ARCH=$(uname -m)
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+ARCH=${ARCH:-$(uname -m)}
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 tmp
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 getapk