Permission denied errors when building with custom user:group #439
Description
Hey, I'm trying to use this image to test some swift package without hard dependency on swift itself. Ideally I'd like to use it by mounting a directory into a container and running swift test inside the docker, but I set the --user "$(id -u):$(id -g)" to not end up with files owned by root inside my repository. It works fine on my linux machine where this evaluates to 1000:100 however on both CI and macos it does hit a permission denied errors as user / group there is different.
I think it'd be cool to allow such use case by setting relaxed ownership for /.cache and /.swiftpm directories.
sudo docker run --rm --user 501:20 --volume ~/lumina/node-uniffi/tests/swift:/app --workdir /app swift:6.0.3 swift test
Unable to find image 'swift:6.0.3' locally
6.0.3: Pulling from library/swift
5b17151e9710: Pull complete
9c86af143950: Pull complete
2d71b9490344: Pull complete
0df45399d30e: Pull complete
Digest: sha256:21ec2ef4572c5989ca7c0113ee9286931715f0a2f8e216df63b8af059c9b25c3
Status: Downloaded newer image for swift:6.0.3
warning: /.swiftpm/configuration is not accessible or not writable, disabling user-level cache features.
warning: /.swiftpm/security is not accessible or not writable, disabling user-level cache features.
warning: /.cache/org.swift.swiftpm is not accessible or not writable, disabling user-level cache features.
warning: 'app': failed loading cached manifest for 'app': Error Domain=NSCocoaErrorDomain Code=4 "The file doesn’t exist."
warning: 'app': failed closing manifest db cache: Error Domain=NSCocoaErrorDomain Code=4 "The file doesn’t exist."
error: 'app': Invalid manifest (compiled with: ["/usr/bin/swiftc", "-vfsoverlay", "/tmp/TemporaryDirectory.CzVcrh/vfs.yaml", "-L", "/usr/lib/swift/pm/ManifestAPI", "-lPackageDescription", "-Xlinker"
, "-rpath", "-Xlinker", "/usr/lib/swift/pm/ManifestAPI", "-swift-version", "5", "-I", "/usr/lib/swift/pm/ManifestAPI", "-package-description-version", "5.10.0", "/app/Package.swift", "-o", "/tmp/Tem
poraryDirectory.CfkEx1/app-manifest"])
<unknown>:0: error: unable to open output file '/.cache/clang/ModuleCache/OXJJCGK251FM/SwiftShims-KL4KQ8XX75N7.pcm': 'Permission denied'
<unknown>:0: error: could not build C module 'SwiftShims'
warning: 'app': failed loading cached manifest for 'app': Error Domain=NSCocoaErrorDomain Code=4 "The file doesn’t exist."
warning: 'app': failed closing manifest db cache: Error Domain=NSCocoaErrorDomain Code=4 "The file doesn’t exist."
error: 'app': Invalid manifest (compiled with: ["/usr/bin/swiftc", "-vfsoverlay", "/tmp/TemporaryDirectory.aNExBp/vfs.yaml", "-L", "/usr/lib/swift/pm/ManifestAPI", "-lPackageDescription", "-Xlinker"
, "-rpath", "-Xlinker", "/usr/lib/swift/pm/ManifestAPI", "-swift-version", "5", "-I", "/usr/lib/swift/pm/ManifestAPI", "-package-description-version", "5.10.0", "/app/Package.swift", "-o", "/tmp/Tem
poraryDirectory.ZTiXVZ/app-manifest"])
<unknown>:0: error: unable to open output file '/.cache/clang/ModuleCache/OXJJCGK251FM/SwiftShims-KL4KQ8XX75N7.pcm': 'Permission denied'
<unknown>:0: error: could not build C module 'SwiftShims'