Bug in installer.sh#L552-L556 and missing signature files

[dlangBugzillaToGithub]

Andrew Edwards reported this on 2020-09-05T14:11:31Z

Transferred from https://issues.dlang.org/show_bug.cgi?id=21226

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Description

The following lines:

https://github.com/dlang/installer/blob/720d3af0756390c065774b62952076fc73d17a49/script/install.sh#L552-L556

incorrectly assumes that we've always used 2.xxx.x for our releases. As a result, it wrongly classifies any compiler prior to 2.065.0 as nightlies and fails to install them.

I attempted to remedy this by changing the condition to:

    if [[ ! $input_compiler =~ -[0-9]{4}-[0-9]{2}-[0-9]{2}$ ]] &&
       [[ ! $input_compiler =~ -[0-9][.][0-9]{3}$ ]] &&
       [[ ! $input_compiler =~ -[0-9][.][0-9]{3}[.][0-9]{1,3}(-[0-9]{1,3})? ]]; then

Not sure if this messes up some other logic further down in the script but it works for my purposes. I don't install nighties so I couldn't care less. Nightlies are a hit and miss thing anyway. We haven't had one uploaded since March. The other option I see is to rename these releases to match current convention. 

This works to an extent. It downloads the archive but fails on attempt to download the signature files. All release from 2.000 to 2.064 are missing them.

Please upload those files and patch the script to allow for their download/installation.

--Andrew