2 files changed, 20 insertions, 12 deletions
diff --git a/libexec/app-install-file b/libexec/app-install-file
index c31f1f4..32b0407 100755
--- a/libexec/app-install-file
+++ b/libexec/app-install-file
@@ -48,21 +48,29 @@ then
   usage
 fi
 
-if [ -d versions/$version ]
+re="[.a-zA-Z0-9]"
+
+if [[ ! $version =~ $re ]]
 then
-  echo "Version $version is already installed"
-  exit 1
+  fatal "Invalid version: $version"
 fi
 
-mkdir -p versions/$version
-
-echo "Unpacking..."
-unzip -q -d versions/$version $file
-
-if [ ! -d versions/$version/root ]
+if [ -d versions/$version ]
 then
-  echo "Invalid zip file, did not contain a ./root directory." >&2
-  exit 1
+  echo "Version $version is already unpacked"
+else
+  mkdir -p versions/$version.tmp
+
+  echo "Unpacking..."
+  unzip -q -d versions/$version.tmp $file
+
+  if [ ! -d versions/$version.tmp/root ]
+  then
+    echo "Invalid zip file, did not contain a 'root' directory." >&2
+    rm -rf versions/$version.tmp
+    exit 1
+  fi
+  mv versions/$version.tmp versions/$version
 fi
 
 if [ -n "$prepend_config" ]
diff --git a/libexec/app-resolver-file b/libexec/app-resolver-file
index 2b708e8..5972926 100755
--- a/libexec/app-resolver-file
+++ b/libexec/app-resolver-file
@@ -47,7 +47,7 @@ init() {
 resolve_version() {
   path=$(app-conf get file.path)
 
-  local s=$(stat -c %Z $path)
+  local s=$(stat -c %Y $path)
 
   app-conf set app.resolved_version "$s"
 }