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Validation of registry mirrors was performed during daemon startup,
but after the config-file was validated. As a result, the `--validate`
option would incorrectly print that the configuration was valid, but
the daemon would fail to start;
echo '{"registry-mirrors":["example.com"]}' > my-config.json
dockerd --config-file ./my-config.json --validate
configuration OK
dockerd --config-file ./my-config.json
# ...
failed to start daemon: invalid mirror: no scheme specified for "example.com": must use either 'https://' or 'http://'
With this patch applied, validation is also performed as part of the
daemon config validation;
echo '{"registry-mirrors":["example.com"]}' > my-config.json
dockerd --config-file ./my-config.json --validate
unable to configure the Docker daemon with file ./my-config.json: merged configuration validation from file and command line flags failed: invalid mirror: no scheme specified for "example.com": must use either 'https://' or 'http://'
# fix the invalid config
echo '{"registry-mirrors":["https://example.com"]}' > my-config.json
dockerd --config-file ./my-config.json --validate
configuration OK
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 1d8545d60c)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>