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travis_retry for dev-tools install #4550
in Travis seeing errors like:
which is doing GPG verification of the downloaded Phive utility and then
a work-around is to retry done by travis_retry (retries 3 times by default
this is also true for other network operations during dev-tools install.
as the install.sh script only installs by testing for files if already
to establish transaction behavior for the Phive installation, files are
for better verification of each utility installation per potential retry,
change for all wget operations having the --no-clobber argument while
utilities are now tested for being executable as only testing for being a
additionally a minor improvement in extracting the single shellcheck file
these changes should also benefit calling the script again in interactive
Just a bit more context here. When filing #4517 I experienced Travis build errors on the new 2.15 base branch (was previously filing against 2.12 w/o this problem).