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<body><div>Right, you don't need it to load an application in a release. But that wasn't your question. I was just replying that it isn't a convention since specific features, as you note, rely on it.<br></div>
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<div id="sig19496053"><div class="signature">--<br></div>
<div class="signature"> Tristan Sloughter<br></div>
<div class="signature"> "I am not a crackpot" - Abe Simpson<br></div>
<div class="signature"> t@crashfast.com<br></div>
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<div>On Sat, Feb 17, 2018, at 11:09 AM, Xavier Noria wrote:<br></div>
<blockquote type="cite"><div dir="ltr"><div><div>On Sat, Feb 17, 2018 at 7:49 PM, Tristan Sloughter <span dir="ltr"><<a href="mailto:t@crashfast.com">t@crashfast.com</a>></span> wrote:<br></div>
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<div><div>It is not a convention. Only with a file named sys.config will the runtime read in additional configs you may include within it by name. With sys.config you can do:<br></div>
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<div>[{my_app, [...]},<br></div>
<div> "other.config"}].<br></div>
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<div>This has already been stated in previous messages, and it is implemented <a href="https://github.com/erlang/otp/blob/7304c1e1deed6ac1fbddc88ea5c6d5138231dbf7/lib/kernel/src/application_controller.erl#L1821">here</a>.<br></div>
<div><div style="color:rgb(34, 34, 34);font-family:arial, sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255, 255, 255);text-decoration-style:initial;text-decoration-color:initial;"><br></div>
<div style="color:rgb(34, 34, 34);font-family:arial, sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255, 255, 255);text-decoration-style:initial;text-decoration-color:initial;">If you look at the code, it says that *if* the basename is "sys.config", you *can* nest. That is not the same as saying that you need sys.config to load an application in a release. We have seen some counterexamples, you can edit the generated shell scripts to load ~/foo.config and it boots just fine, some tools have support for alternative files, and, definitive, if you read application_controller.erl you'll see the file is not assumed to be anywhere.<br></div>
<div style="color:rgb(34, 34, 34);font-family:arial, sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255, 255, 255);text-decoration-style:initial;text-decoration-color:initial;"><br></div>
<div style="color:rgb(34, 34, 34);font-family:arial, sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255, 255, 255);text-decoration-style:initial;text-decoration-color:initial;">The release handler is the only piece of code to my knowledge that critically depends on its existence. If I read its code correctly, if you want the environment variables merged in an upgrade, sys.config *must* be located under Vsn. *That* is a requirement, but if you don't do release upgrades, anything can be passed to -config (which is what generated scripts do).<br></div>
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