syncthing binary is not executable on catalina

[kastork]

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• are reporting a bug others will be able to reproduce and not asking a question or requesting software. If you're not sure or want to ask a question do so on our Discourse: https://discourse.brew.sh. To get software added or changed in Homebrew please file a Pull Request
• have a problem with brew install (or upgrade, reinstall) a single, Homebrew/homebrew-core formula (not cask) on macOS? If it's a general brew problem please file this issue at Homebrew/brew: https://github.com/Homebrew/brew/issues/new/choose. If it's a Linux problem please file this issue at https://github.com/Homebrew/linuxbrew-core/issues/new/choose. If it's a brew cask problem please file this issue at https://github.com/Homebrew/homebrew-cask/issues/new/choose. If it's a tap (e.g. Homebrew/homebrew-php) problem please file this issue at the tap.
• ran brew update and can still reproduce the problem?
• ran brew doctor, fixed all issues and can still reproduce the problem?
• ran brew gist-logs <formula> (where <formula> is the name of the formula that failed) and included the output link?
• if brew gist-logs didn't work: ran brew config and brew doctor and included their output with your issue?

To help us debug your issue please explain:

• What you were trying to do (and why)

Attempting to run syncthing via brew services after successful brew install

• What happened (include command output)

› /usr/local/opt/syncthing/bin/syncthing -no-browser -no-restart
zsh: exec format error: /usr/local/opt/syncthing/bin/syncthing

• What you expected to happen

Expected syncthing to start

• Step-by-step reproduction instructions (by running brew install commands)

brew install syncthing
brew services start syncthing

But to see the resulting error, instead of running brew services start just run it directly. e.g. /usr/local/opt/syncthing/bin/syncthing

[fxcoudert]

It is possibly due to Homebrew/brew#6539

What happens if you do file /usr/local/opt/syncthing/bin/syncthing and xxd /usr/local/opt/syncthing/bin/syncthing | head -n 30?

[sihoang]

I use brew to install syncthing and ethereum which are written and built in golang. Both stop working after upgrading to Catalina.

I don't have access to my mac now. When I ran file, it said the file is data instead of an executable.

[fxcoudert]

You can reinstall from source with brew reinstall -s.

[kastork]

Answering @fxcoudert ...
"
What happens if you do file /usr/local/opt/syncthing/bin/syncthing and xxd /usr/local/opt/syncthing/bin/syncthing | head -n 30?
"

sims: kirk/
› file /usr/local/opt/syncthing/bin/syncthing
/usr/local/opt/syncthing/bin/syncthing: data

sims: kirk/
› /opt/syncthing/bin/syncthing | head -n 30
zsh: no such file or directory: /opt/syncthing/bin/syncthing

sims: kirk/
› /usr/local/opt/syncthing/bin/syncthing | head -n 30
zsh: exec format error: /usr/local/opt/syncthing/bin/syncthing

[kastork]

After trying the above, I did

brew reinstall -s syncthing

Then just did

syncthing

And it started right up.

Killed it and did

brew services start syncthing

And again, it started right up.

The reinstall gave this output, I'm not sure what effect the detached head situation will have on the rest of my brew.

==> Reinstalling syncthing
==> Cloning https://github.com/syncthing/syncthing.git
Cloning into '/Users/kirk/Library/Caches/Homebrew/syncthing--git'...
Note: switching to '2c88e473cb089e377628cdd4ea086eb60ff2b195'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by switching back to a branch.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -c with the switch command. Example:

  git switch -c <new-branch-name>

Or undo this operation with:

  git switch -

Turn off this advice by setting config variable advice.detachedHead to false

==> Checking out tag v1.3.0
HEAD is now at 2c88e47 readme: Fix broken link to README-Docker.md (#6025)
==> ./build.sh noupgrade
==> Caveats
To have launchd start syncthing now and restart at login:
  brew services start syncthing
Or, if you don't want/need a background service you can just run:
  syncthing
==> Summary
🍺  /usr/local/Cellar/syncthing/1.3.0: 23 files, 20.6MB, built in 31 seconds

[fxcoudert]

We've reported the tar bug to Apple, but it appears rather tricky.
Meanwhile, I have removed the Catalina bottles in cac9e66

[iwelch]

I think it is actually weirder than a specific program. I just download the binary from syncthing.net. I copy the executable syncthing to ls /usr/local/Cellar/syncthing/1.3.0/bin, overriding the prepared one. syncthing starts up with /usr/local/bin/syncthing. it is a proper binary and works. then reboot your computer. the syncthing binary is now corrupted (data). this does not happen with 1.2.1/synthing . this indeed requires Apple clarification.