C#: Provide skeleton to generate an assemblyInfo file.

Each unit gets a unique assemblyInfo file, on top
of the ones for entrypoints that also gets the git info embedded.

csharp/scripts/BUILD.bazel

@@ -1,17 +1,21 @@
 py_binary(
-    name = "gen-assembly-info",
+    name = "gen-git-assembly-info",
-    srcs = ["gen-assembly-info.py"],
+    srcs = ["gen-git-assembly-info.py"],
+    deps = ["@rules_python//python/runfiles"],
+)
+
+py_binary(
+    name = "gen-assembly-info",
+    srcs = ["gen-assembly-info.py"],
+    visibility = ["//csharp:__subpackages__"],
     deps = ["@rules_python//python/runfiles"],
 )
 
-# this is an instance of the dbscheme kept in the bazel build tree
-# this allows everything that bazel builds to be up-to-date,
-# independently from whether //go:gen was already run to update the checked in files
 genrule(
-    name = "assembly-info-src",
+    name = "git-assembly-info-src",
     srcs = ["@semmle_code//:git_info"],
-    outs = ["AssemblyInfo.cs"],
+    outs = ["GitAssemblyInfo.cs"],
-    cmd = "$(execpath :gen-assembly-info) $@ $(SRCS)",
+    cmd = "$(execpath :gen-git-assembly-info) $@ $(SRCS)",
-    tools = [":gen-assembly-info"],
+    tools = [":gen-git-assembly-info"],
     visibility = ["//csharp:__subpackages__"],
 )

csharp/scripts/gen-assembly-info.py

@@ -1,7 +1,6 @@
 """
-Generates an `AssemblyInfo.cs` file that specifies the `AssemblyInformationalVersion` attribute.
+Generates an `AssemblyInfo.cs` file that specifies a bunch of useful attributes
-
+that we want to set on our assemblies."""
-This attribute is set to the git version string of the repository."""
 
 import pathlib
 import argparse
@@ -9,26 +8,20 @@ import argparse
 
 def options():
     p = argparse.ArgumentParser(
-        description="Generate the assembly info file that contains the git SHA and branch name"
+        description="Generate an assembly info file."
     )
     p.add_argument("output", help="The path to the output file")
-    p.add_argument("gitinfo_files", nargs="+", help="The path to the gitinfo files")
+    p.add_argument("name", help="The name of the assembly")
     return p.parse_args()
 
 
 opts = options()
 
-gitfiles = dict()
-for file in map(pathlib.Path, opts.gitinfo_files):
-    gitfiles[file.name] = file
-
-version_string = gitfiles["git-ql-describe-all.log"].read_text().strip()
-version_string += f" ({gitfiles['git-ql-rev-parse.log'].read_text().strip()})"
-
 output_file = pathlib.Path(opts.output)
 output_file_contents = f"""
 using System.Reflection;
 
-[assembly: AssemblyInformationalVersion("{version_string}")]
+[assembly: XX("{opts.name}")]
+[assembly: YY("ZZ")]
 """
 output_file.write_text(output_file_contents)

csharp/scripts/gen-git-assembly-info.py

@@ -0,0 +1,34 @@
+"""
+Generates an `GitAssemblyInfo.cs` file that specifies the `AssemblyInformationalVersion` attribute.
+
+This attribute is set to the git version string of the repository."""
+
+import pathlib
+import argparse
+
+
+def options():
+    p = argparse.ArgumentParser(
+        description="Generate the git assembly info file that contains the git SHA and branch name"
+    )
+    p.add_argument("output", help="The path to the output file")
+    p.add_argument("gitinfo_files", nargs="+", help="The path to the gitinfo files")
+    return p.parse_args()
+
+
+opts = options()
+
+gitfiles = dict()
+for file in map(pathlib.Path, opts.gitinfo_files):
+    gitfiles[file.name] = file
+
+version_string = gitfiles["git-ql-describe-all.log"].read_text().strip()
+version_string += f" ({gitfiles['git-ql-rev-parse.log'].read_text().strip()})"
+
+output_file = pathlib.Path(opts.output)
+output_file_contents = f"""
+using System.Reflection;
+
+[assembly: AssemblyInformationalVersion("{version_string}")]
+"""
+output_file.write_text(output_file_contents)

misc/bazel/csharp.bzl

@@ -4,10 +4,25 @@ load("//misc/bazel:pkg.bzl", "codeql_pkg_files")
 
 TARGET_FRAMEWORK = "net8.0"
 
+def _gen_assembly_info(name):
+    assembly_info_gen = name + "-assembly-info"
+
+    native.genrule(
+        name = assembly_info_gen,
+        outs = [name + "AssemblyInfo.cs"],
+        cmd = "$(execpath //csharp/scripts:gen-assembly-info) $@ " + name,
+        tools = ["//csharp/scripts:gen-assembly-info"],
+    )
+    return ":" + assembly_info_gen
+
 def codeql_csharp_library(name, **kwargs):
+    assembly_info_gen = _gen_assembly_info(name)
+    srcs = kwargs.pop("srcs", [])
+    srcs.append(assembly_info_gen)
+
     kwargs.setdefault("nullable", "enable")
     kwargs.setdefault("target_frameworks", [TARGET_FRAMEWORK])
-    csharp_library(name = name, **kwargs)
+    csharp_library(name = name, srcs = srcs, **kwargs)
 
 def codeql_xunit_test(name, **kwargs):
     kwargs.setdefault("nullable", "enable")
@@ -40,8 +55,11 @@ def codeql_csharp_binary(name, **kwargs):
     resources = kwargs.pop("resources", [])
     srcs = kwargs.pop("srcs", [])
 
+    assembly_info_gen = _gen_assembly_info(name)
+    srcs.append(assembly_info_gen)
+
     # always add the assembly info file that sets the AssemblyInformationalVersion attribute to the extractor version
-    srcs.append("//csharp/scripts:assembly-info-src")
+    srcs.append("//csharp/scripts:git-assembly-info-src")
 
     csharp_binary_target = "bin/" + name
     publish_binary_target = "publish/" + name