Swift Setup: Unexpected error, unable to continue

[odrobnik]

Describe the bug

Unexpected error, unable to continue. Please report at https://github.com/swift-actions/setup-swift/issues
The process '/usr/bin/gpg' failed with exit code 2
Stacktrace:
Error: The process '/usr/bin/gpg' failed with exit code 2
    at ExecState._setResult (/home/runner/work/_actions/swift-actions/setup-swift/v2.2.0/dist/index.js:3195:25)
    at ExecState.CheckComplete (/home/runner/work/_actions/swift-actions/setup-swift/v2.2.0/dist/index.js:3178:18)
    at ChildProcess.<anonymous> (/home/runner/work/_actions/swift-actions/setup-swift/v2.2.0/dist/index.js:3072:27)
    at ChildProcess.emit (node:events:524:28)
    at maybeClose (node:internal/child_process:1104:16)
    at ChildProcess._handle.onexit (node:internal/child_process:304:5)

Workflow configuration (please complete the following information):

The Linux build started failing, on Setup Swift 6.0, in this yml:

name: Swift

on:
  push:
    branches: ["main"]
  pull_request:
    branches: ["main"]

jobs:
  build:
    runs-on: macos-latest

    steps:
      - uses: actions/checkout@v4
      
      - name: Setup Swift 6.0
        uses: swift-actions/setup-swift@v2.2.0
        with:
          swift-version: "6.0"

      - name: Verify Swift version
        run: swift --version
      
      - name: Build & Test
        run: swift test

  build-linux:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4
      
      - name: Setup Swift 6.0
        uses: swift-actions/setup-swift@v2.2.0
        with:
          swift-version: "6.0"

      - name: Verify Swift version
        run: swift --version
      
      - name: Build & Test
        run: swift test 

[odrobnik]

Here's the failing step with debug logging enabled:

##[debug]Evaluating condition for step: 'Setup Swift 6.0'
##[debug]Evaluating: success()
##[debug]Evaluating success:
##[debug]=> true
##[debug]Result: true
##[debug]Starting: Setup Swift 6.0
##[debug]Loading inputs
##[debug]Loading env
Run swift-actions/setup-swift@v2.2.0
##[debug]Resolved range >=6.0.0 <6.1.0-0
##[debug]Found matching version 6.0.2
##[debug]isExplicit: 6.0.2
##[debug]explicit? true
##[debug]checking cache: /opt/hostedtoolcache/swift-Ubuntu/6.0.2/x64
##[debug]not found
##[debug]No matching installation found
##[debug]Fetching verification keys
##[debug]Downloading https://swift.org/keys/all-keys.asc
##[debug]Destination /home/runner/work/_temp/954b1763-9bd7-4e6c-a3bb-e37a67d8a481
##[debug]download complete
##[debug]Importing verification keys
/usr/bin/gpg --import /home/runner/work/_temp/954b1763-9bd7-4e6c-a3bb-e37a67d8a481
gpg: directory '/home/runner/.gnupg' created
gpg: keybox '/home/runner/.gnupg/pubring.kbx' created
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0
Error: Unexpected error, unable to continue. Please report at https://github.com/swift-actions/setup-swift/issues
The process '/usr/bin/gpg' failed with exit code 2
Stacktrace:
Error: The process '/usr/bin/gpg' failed with exit code 2
    at ExecState._setResult (/home/runner/work/_actions/swift-actions/setup-swift/v2.2.0/dist/index.js:3195:25)
    at ExecState.CheckComplete (/home/runner/work/_actions/swift-actions/setup-swift/v2.2.0/dist/index.js:3178:18)
    at ChildProcess.<anonymous> (/home/runner/work/_actions/swift-actions/setup-swift/v2.2.0/dist/index.js:3072:27)
    at ChildProcess.emit (node:events:524:28)
    at maybeClose (node:internal/child_process:1104:16)
    at ChildProcess._handle.onexit (node:internal/child_process:304:5)
##[debug]Node Action run completed with exit code 1
##[debug]Finishing: Setup Swift 6.0

[nickruddeni]

We are also experiencing this

[Lint](https://github.com/Surfline/surfline-ios/actions/runs/15852487666/job/44690947551#step:3:10)
Unexpected error, unable to continue. Please report at https://github.com/swift-actions/setup-swift/issues
The process '/usr/bin/gpg' failed with exit code 2
Stacktrace:
Error: The process '/usr/bin/gpg' failed with exit code 2
    at ExecState._setResult (/home/runner/work/_actions/swift-actions/setup-swift/v1/dist/index.js:3298:25)
    at ExecState.CheckComplete (/home/runner/work/_actions/swift-actions/setup-swift/v1/dist/index.js:3281:18)
    at ChildProcess.<anonymous> (/home/runner/work/_actions/swift-actions/setup-swift/v1/dist/index.js:3175:27)
    at ChildProcess.emit (node:events:524:28)
    at maybeClose (node:internal/child_process:1104:16)
    at ChildProcess._handle.onexit (node:internal/child_process:304:5)

[mman]

Likely a duplicate of #694

[odrobnik]

I tried removing the action, because swift version is shown as > 6 anyway on Linux. Therefore I won't need it any more I guess

Run swift --version
  swift --version
  shell: /usr/bin/bash -e {0}
Swift version 6.1.2 (swift-6.1.2-RELEASE)
Target: x86_64-unknown-linux-gnu

On macOS, curiously, it IS still needed:

Run swift --version
  swift --version
  shell: /bin/bash -e {0}
Apple Swift version 5.10 (swiftlang-5.10.0.13 clang-1500.3.9.4)
Target: arm64-apple-macosx14.0
swift-driver version: 1.90.11.1 

Why would there be such a difference?

[ratranqu]

For this error, it looks like the downloaded key from https://www.swift.org/keys/all-keys.asc is still gzipped, so gpg doesn't understand it. (I have something similar and I am able to decompress the file it tries to import and then import it).

Here's the failing step with debug logging enabled:

##[debug]Evaluating condition for step: 'Setup Swift 6.0'
##[debug]Evaluating: success()
##[debug]Evaluating success:
##[debug]=> true
##[debug]Result: true
##[debug]Starting: Setup Swift 6.0
##[debug]Loading inputs
##[debug]Loading env
Run swift-actions/setup-swift@v2.2.0
##[debug]Resolved range >=6.0.0 <6.1.0-0
##[debug]Found matching version 6.0.2
##[debug]isExplicit: 6.0.2
##[debug]explicit? true
##[debug]checking cache: /opt/hostedtoolcache/swift-Ubuntu/6.0.2/x64
##[debug]not found
##[debug]No matching installation found
##[debug]Fetching verification keys
##[debug]Downloading https://swift.org/keys/all-keys.asc
##[debug]Destination /home/runner/work/_temp/954b1763-9bd7-4e6c-a3bb-e37a67d8a481
##[debug]download complete
##[debug]Importing verification keys
/usr/bin/gpg --import /home/runner/work/_temp/954b1763-9bd7-4e6c-a3bb-e37a67d8a481
gpg: directory '/home/runner/.gnupg' created
gpg: keybox '/home/runner/.gnupg/pubring.kbx' created
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0
Error: Unexpected error, unable to continue. Please report at https://github.com/swift-actions/setup-swift/issues
The process '/usr/bin/gpg' failed with exit code 2
Stacktrace:
Error: The process '/usr/bin/gpg' failed with exit code 2
    at ExecState._setResult (/home/runner/work/_actions/swift-actions/setup-swift/v2.2.0/dist/index.js:3195:25)
    at ExecState.CheckComplete (/home/runner/work/_actions/swift-actions/setup-swift/v2.2.0/dist/index.js:3178:18)
    at ChildProcess.<anonymous> (/home/runner/work/_actions/swift-actions/setup-swift/v2.2.0/dist/index.js:3072:27)
    at ChildProcess.emit (node:events:524:28)
    at maybeClose (node:internal/child_process:1104:16)
    at ChildProcess._handle.onexit (node:internal/child_process:304:5)
##[debug]Node Action run completed with exit code 1
##[debug]Finishing: Setup Swift 6.0

[finestructure]

I think we're seeing the same problem as @odrobnik but I'm not 100%, because his error message clipped some of the preceding context. Here's what I see:

gpg: no valid OpenPGP data found.
gpg: Total number processed: 0
Error: Unexpected error, unable to continue. Please report at https://github.com/swift-actions/setup-swift/issues
The process '/usr/bin/gpg' failed with exit code 2
Stacktrace:
Error: The process '/usr/bin/gpg' failed with exit code 2
    at ExecState._setResult (/home/runner/work/_actions/swift-actions/setup-swift/v2/dist/index.js:3197:25)
    at ExecState.CheckComplete (/home/runner/work/_actions/swift-actions/setup-swift/v2/dist/index.js:3180:18)
    at ChildProcess.<anonymous> (/home/runner/work/_actions/swift-actions/setup-swift/v2/dist/index.js:3074:27)
    at ChildProcess.emit (node:events:524:28)
    at maybeClose (node:internal/child_process:1104:16)
    at ChildProcess._handle.onexit (node:internal/child_process:304:5)

I wonder if gpg: no valid OpenPGP data found. is the cause of it?

Edit: looks like @ratranqu actually has that same context and more detail.

[finestructure]

The issue came and went and came again for us. Is https://swift.org/keys/all-keys.asc changing format unexpectedly to zipped/non-zipped perhaps?

[finestructure]

I asked around and @gwynne suspects that this is a CDN issue:

I've seen that before, several months back; it appeared to be a transient issue with a CDN
Looks like that was back in early February
I believe what specifically happens is that curl does not send Accept-Encoding by default, but the server responds with Content-Encoding: gzip anyway, and curl doesn't detect that case. It can be worked around by passing --compressed to curl

$ curl -sO https://www.swift.org/keys/all-keys.asc
$ file all-keys.asc
all-keys.asc: gzip compressed data, max speed, from Unix, original size modulo 2^32 20253
$ curl -sO --compressed https://www.swift.org/keys/all-keys.asc
$ file all-keys.asc
all-keys.asc: PGP public key block Public-Key (old)

Adding --compressed might be all that's needed. I'll poke around to see if I can find the call site.

[finestructure]

Adding --compressed might be all that's needed. I'll poke around to see if I can find the call site.

I've had a look and it's not curl that's being invoked but a JS routine toolCache.downloadTool. Unfortunately, it's not clear to me how to adjust it accordingly but perhaps someone else can take it from here?