install: version error and user agent filtering

[adetch]

What happened

Ran the standard one-liner install and it failed silently after detecting the platform. Dug into it and found two separate issues both of which need a fix for the installer to work.

Currently it bails after:

curl -fsSL https://codedb.codegraff.com/install.sh | sh
codedb installer

platform  darwin-arm64

Bug 1: Version lookup breaks on a space

The script grabs the latest version from latest.json and parses it with grep:

curl -fsSL "$BASE_URL/latest.json" | grep -o '"version":"[^"]*"' | cut -d'"' -f4

The actual JSON response has a space after the colon:

{
  "version": "0.2.3"
}

The grep pattern doesn't account for the space, so matches nothing. The version comes back empty and the script bails out with error: could not fetch latest version.

Fix is to make the regex happy w/ the whitespace:

grep -oE '"version"\s*:\s*"[^"]*"'

I set the version msyelf to work around:

curl -fsSL https://codedb.codegraff.com/install.sh | CODEDB_VERSION=0.2.3 sh

Bug 2: Cloudflare blocks the binary download

Even after getting past the version issue, the actual binary download failed with a 404:

error: download failed
url: https://codedb.codegraff.com/v0.2.3/codedb-darwin-arm64

The file is there, visiting the same URL in a browser downloads it fine. The issue is that Cloudflare is blocking requests with curl's default user-agent. Spoofing a browser user-agent works sometimes but not reliably. Probably some some kind of bot detection or rate limiting on their end.

Fixed it by providing a ~valid user agent.

curl -fsSL -A "Mozilla/5.0" "$url" -o "$tmp"

[justrach]

Resolved by PR #141.