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Fix errors when commands return error text rather than data

I'm looking at you euca2ools

Change-Id: I82bfb8a3ee58fdc54ead6a285c9415593e741892

Dean Troyer authored on 2012/11/03 06:59:03
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@@ -570,7 +570,7 @@ function is_package_installed() {
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 # is_set env-var
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 function is_set() {
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     local var=\$"$1"
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-    if eval "[ -z $var ]"; then
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+    if eval "[ -z \"$var\" ]"; then
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         return 1
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     fi
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     return 0