apple-codesign: add a test showing that symlink overwrites are broken

Unsure if there is a bug report for this. But it is definitely a bug.

apple-codesign/tests/cli_tests.rs

@@ -283,5 +283,6 @@ fn cli_tests() {
         cases.skip("tests/cmd/sign-bundle-framework.trycmd");
         cases.skip("tests/cmd/sign-bundle-with-nested-framework.trycmd");
         cases.skip("tests/cmd/sign-bundle-electron.trycmd");
+        cases.skip("tests/cmd/sign-bundle-symlink-overwrite.trycmd");
     }
 }

apple-codesign/tests/cmd/sign-bundle-symlink-overwrite.trycmd

@@ -0,0 +1,60 @@
+Sign a bundle with symlinks and verify symlink overwrites work
+
+```
+$ rcodesign debug-create-macho MyApp.app/Contents/MacOS/MyApp
+assuming default minimum version 11.0.0
+writing Mach-O to MyApp.app/Contents/MacOS/MyApp
+
+$ rcodesign debug-create-info-plist --bundle-name MyApp MyApp.app/Contents/Info.plist
+writing MyApp.app/Contents/Info.plist
+
+$ mkdir -p MyApp.app/Contents/Resources
+$ touch MyApp.app/Contents/Resources/file-00.txt
+$ touch MyApp.app/Contents/Resources/file-01.txt
+$ ln -s file-00.txt MyApp.app/Contents/Resources/file.txt
+
+$ rcodesign sign MyApp.app MyApp.app.signed
+signing MyApp.app to MyApp.app.signed
+signing bundle at MyApp.app
+signing 0 nested bundles in the following order:
+signing bundle at MyApp.app into MyApp.app.signed
+collecting code resources files
+copying file MyApp.app/Contents/Info.plist -> MyApp.app.signed/Contents/Info.plist
+sealing regular file Resources/file-00.txt
+copying file MyApp.app/Contents/Resources/file-00.txt -> MyApp.app.signed/Contents/Resources/file-00.txt
+sealing regular file Resources/file-01.txt
+copying file MyApp.app/Contents/Resources/file-01.txt -> MyApp.app.signed/Contents/Resources/file-01.txt
+sealing symlink Resources/file.txt -> file-00.txt
+replicating symlink MyApp.app.signed/Contents/Resources/file.txt -> file-00.txt
+writing sealed resources to MyApp.app.signed/Contents/_CodeSignature/CodeResources
+signing main executable Contents/MacOS/MyApp
+setting main executable binary identifier to com.example.mybundle (derived from CFBundleIdentifier in Info.plist)
+inferring default signing settings from Mach-O binary
+signing Mach-O binary at index 0
+binary targets macOS >= 11.0.0 with SDK 11.0.0
+creating ad-hoc signature
+code directory version: 132096
+total signature size: 421 bytes
+writing signed main executable to MyApp.app.signed/Contents/MacOS/MyApp
+
+$ ln -s file-01.txt MyApp.app/Contents/Resources/file.txt
+? 1
+/Users/gps/src/apple-platform-rs/target/coreutils/bin/ln: Already exists
+
+$ rcodesign sign MyApp.app MyApp.app.signed
+? 1
+signing MyApp.app to MyApp.app.signed
+signing bundle at MyApp.app
+signing 0 nested bundles in the following order:
+signing bundle at MyApp.app into MyApp.app.signed
+collecting code resources files
+copying file MyApp.app/Contents/Info.plist -> MyApp.app.signed/Contents/Info.plist
+sealing regular file Resources/file-00.txt
+copying file MyApp.app/Contents/Resources/file-00.txt -> MyApp.app.signed/Contents/Resources/file-00.txt
+sealing regular file Resources/file-01.txt
+copying file MyApp.app/Contents/Resources/file-01.txt -> MyApp.app.signed/Contents/Resources/file-01.txt
+sealing symlink Resources/file.txt -> file-00.txt
+replicating symlink MyApp.app.signed/Contents/Resources/file.txt -> file-00.txt
+Error: I/O error: File exists (os error 17)
+
+```