Centralize and fix random identifier generation. #246
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In some subshells `cat /dev/urandom | tr -dc 'a-z0-9' | fold -w 20 | head -n 1` can hang with the pipe being closed by `head` leaving `fold` attempting to write into a pipe which blocks indefinitely. This removes the buffering fold performs by changing the pipeline to read a byte at a time and stop when the number of required random characters is satisfied. Fixes GoogleCloudPlatform#245
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In some subshells
cat /dev/urandom | tr -dc 'a-z0-9' | fold -w 20 | head -n 1can hang with the pipe being closed by
headleavingfoldattempting to write into a pipe which blocks indefinitely.
This removes the buffering fold performs by changing the pipeline
to read a byte at a time and stop when the number of required
random characters is satisfied.
Fixes #245