Script to edit google compute engine instance metadata entry as a file

#!/usr/bin/fish

set instance $argv[1]
set key $argv[2]

set tmpdir (mktemp -d)
set file $tmpdir/(string replace _ . $key)

gcloud compute instances describe $instance --format="value(metadata.$key)" > $file

set hash (md5sum $file)

echo $hash

eval $EDITOR $file

if test -s $file
 set hash2 (md5sum $file)
 echo $hash2
 if test "$hash2" != "$hash"
 echo File changed, updating
 gcloud compute instances add-metadata $instance --metadata-from-file=$key=$file
 else
 echo File not changed, not updating
 end
 else
 echo File is empty, not updating
end

rm -rf $tmpdir

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