SERVER-104974 make gdb dump locks work in bazel (#39768)

GitOrigin-RevId: db75a756afbfd30990abeee0e2372cb752ca77b3

BUILD.bazel

@@ -4,6 +4,7 @@ load("//bazel/install_rules:install_rules.bzl", "TEST_TAGS", "mongo_install")
 load("//bazel/install_rules:bolt.bzl", "bolt_instrument", "bolt_optimize")
 load("//bazel:mongo_src_rules.bzl", "mongo_cc_binary")
 load("//bazel/toolchains/cc/mongo_linux:mongo_toolchain.bzl", "setup_mongo_toolchain_aliases")
+load("//bazel/toolchains/cc/mongo_linux:mongo_gdb.bzl", "setup_gdb_toolchain_aliases")
 load("//bazel/config:render_template.bzl", "render_template")
 load("@npm//:eslint/package_json.bzl", eslint_bin = "bin")
 load("//bazel:mongo_js_rules.bzl", "mongo_js_library")
@@ -95,6 +96,8 @@ alias(
 
 setup_mongo_toolchain_aliases()
 
+setup_gdb_toolchain_aliases()
+
 render_template(
     name = "clang_tidy_config",
     srcs = [

WORKSPACE.bazel

@@ -1,6 +1,6 @@
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 load("//bazel/toolchains/cc/mongo_linux:mongo_toolchain.bzl", "setup_mongo_toolchains")
-load("//bazel/toolchains/cc/mongo_linux:mongo_gdb.bzl", "gdb_download")
+load("//bazel/toolchains/cc/mongo_linux:mongo_gdb.bzl", "setup_gdb_toolchains")
 
 http_archive(
     name = "aspect_rules_lint",
@@ -11,10 +11,7 @@ http_archive(
 
 setup_mongo_toolchains()
 
-gdb_download(
-    name = "gdb",
-    version = "v5",
-)
+setup_gdb_toolchains()
 
 http_archive(
     name = "windows_sasl",

bazel/mongo_src_rules.bzl

@@ -751,7 +751,7 @@ def _mongo_cc_binary_and_test(
         "testonly": testonly,
         "copts": copts,
         "data": data + SANITIZER_DATA + select({
-            "//bazel/platforms:use_mongo_toolchain": ["@gdb"],
+            "//bazel/platforms:use_mongo_toolchain": ["//:gdb"],
             "//conditions:default": [],
         }),
         "tags": tags,

bazel/toolchains/cc/mongo_linux/mongo_gdb.bzl

@@ -3,14 +3,25 @@ load("//bazel:utils.bzl", "generate_noop_toolchain", "get_toolchain_subs", "retr
 
 def _gdb_download(ctx):
     distro, arch, substitutions = get_toolchain_subs(ctx)
-
     toolchain_key = "{distro}_{arch}".format(distro = distro, arch = arch)
 
+    toolchain_info = None
+    python3_version = None
+    urls = None
+    sha = None
+
+    if ctx.attr.version == "v5":
         if toolchain_key in TOOLCHAIN_MAP_V5:
+            python3_version = "3.10"
             toolchain_info = TOOLCHAIN_MAP_V5[toolchain_key]
             urls = toolchain_info["url"]
             sha = toolchain_info["sha"]
 
+    if toolchain_info == None:
+        generate_noop_toolchain(ctx, substitutions)
+        ctx.report_progress("Mongo gdb " + ctx.attr.version + " not supported on this platform. Platform key not found: " + toolchain_key)
+        return None
+
     ctx.report_progress("downloading {} gdb: {}".format(toolchain_key, urls))
     retry_download_and_extract(
         ctx = ctx,
@@ -20,7 +31,39 @@ def _gdb_download(ctx):
     )
 
     ctx.report_progress("generating gdb " + ctx.attr.version + " build file")
-        pythonhome = str(ctx.workspace_root) + "/bazel-mongo/external/gdb/stow/python3-" + ctx.attr.version
+
+    external = str(ctx.path(".."))
+    pythonhome = external + "/gdb_" + ctx.attr.version + "/stow/python3-" + ctx.attr.version
+
+    mongodb_toolchain_path = external + "/mongo_toolchain_" + ctx.attr.version
+    stdlib_pp_dir = mongodb_toolchain_path + "/stow/gcc-" + ctx.attr.version + "/share"
+    readelf = mongodb_toolchain_path + "/" + ctx.attr.version + "/bin/llvm-readelf"
+
+    if "amazon_linux_2" == distro:
+        # our toolchain python version requires newer openssl, which is not available on AL2
+        # so we can use pretty printers on AL2
+        python_env = "{}"
+    else:
+        # here we only have one dependency for our pretty printers to run. It must be installed into the python
+        # that gdb was built with. We use pip since this is a single dependency that we own.
+        result = ctx.execute([
+            pythonhome + "/bin/python3",
+            "-m",
+            "pip",
+            "install",
+            "pymongo==4.12.0",
+            "--target=" + pythonhome + "/lib/python" + python3_version + "/site-packages",
+        ])
+        if result.return_code != 0:
+            fail("Failed to install python module: " + result.stderr)
+
+        python_env = """{
+        "PYTHONPATH": "%s/lib/python3.10",
+        "PYTHONHOME": "%s",
+        "MONGO_GDB_PP_DIR": "%s",
+        "MONGO_GDB_READELF": "%s",
+    }""" % (pythonhome, pythonhome, stdlib_pp_dir, readelf)
+
     ctx.file(
         "BUILD.bazel",
         """
@@ -28,10 +71,10 @@ sh_binary(
     name = "gdb",
     srcs = ["working_dir.sh"],
     data = ["%s/bin/gdb"],
-    env = {"PYTHONPATH": "%s/lib/python3.10", "PYTHONHOME": "%s"},
+    env = %s,
     visibility = ["//visibility:public"],
 )
-""" % (ctx.attr.version, pythonhome, pythonhome),
+""" % (ctx.attr.version, python_env),
     )
 
     ctx.file(
@@ -49,18 +92,13 @@ if [ -z $BUILD_WORKING_DIRECTORY ]; then
 fi
 
 cd $BUILD_WORKING_DIRECTORY
-
-${RUNFILES_WORKING_DIRECTORY}/../gdb/%s/bin/gdb "${@:1}"
-""" % ctx.attr.version,
+${RUNFILES_WORKING_DIRECTORY}/../gdb_%s/%s/bin/gdb -iex "set auto-load safe-path %s/.gdbinit" "${@:1}"
+""" % (ctx.attr.version, ctx.attr.version, str(ctx.workspace_root)),
     )
 
-    else:
-        generate_noop_toolchain(ctx, substitutions)
-        ctx.report_progress("Mongo gdb " + ctx.attr.version + " not supported on this platform. Platform key not found: " + toolchain_key)
-
     return None
 
-gdb_download = repository_rule(
+gdb_v5_download = repository_rule(
     implementation = _gdb_download,
     attrs = {
         "os": attr.string(
@@ -71,10 +109,28 @@ gdb_download = repository_rule(
             values = ["amd64", "aarch64", "amd64", "x86_64", "ppc64le", "s390x"],
             doc = "Host architecture.",
         ),
-        "version": attr.string(
-            values = ["v4", "v5"],
-            doc = "Mongodbtoolchain version.",
-            mandatory = True,
+        "version": attr.string(),
+        "mongo_toolchain": attr.label(
+            allow_files = True,
         ),
     },
 )
+
+def setup_gdb_toolchains():
+    gdb_v5_download(
+        name = "gdb_v5",
+        version = "v5",
+        mongo_toolchain = "@mongo_toolchain_v5//:all",
+    )
+
+def setup_gdb_toolchain_aliases(name = "setup_toolchains"):
+    # v5 is the default version we currently use, so we name it unversioned
+    native.alias(
+        name = "gdb",
+        actual = "@gdb_v5//:gdb",
+    )
+
+    native.alias(
+        name = "gdb_v5",
+        actual = "@gdb_v5//:gdb",
+    )

buildscripts/gdb/mongo.py

@@ -17,13 +17,10 @@ if not gdb:
 
 
 def detect_toolchain(progspace):
+
+    readelf_bin = os.environ.get("MONGO_GDB_READELF", "/opt/mongodbtoolchain/v5/bin/llvm-readelf")
+    if not os.path.exists(readelf_bin):
         readelf_bin = "readelf"
-    for path in [
-        "/opt/mongodbtoolchain/v5/bin/llvm-readelf",
-    ]:
-        if os.path.exists(path):
-            readelf_bin = path
-            break
 
     gcc_version_regex = re.compile(r".*\]\s*GCC: \(GNU\) (\d+\.\d+\.\d+)\s*$")
     clang_version_regex = re.compile(r".*\]\s*MongoDB clang version (\d+\.\d+\.\d+).*")
@@ -79,8 +76,9 @@ STDERR:
 -----------------
 Assuming {toolchain_ver} as a default, this could cause issues with the printers.""")
 
+    base_toolchain_dir = os.environ.get("MONGO_GDB_PP_DIR", f"/opt/mongodbtoolchain/{toolchain_ver}/share")
     pp = glob.glob(
-        f"/opt/mongodbtoolchain/{toolchain_ver}/share/gcc-*/python/libstdcxx/v6/printers.py"
+        f"{base_toolchain_dir}/gcc-*/python/libstdcxx/v6/printers.py"
     )
     printers = pp[0]
     return os.path.dirname(os.path.dirname(os.path.dirname(printers)))
@@ -587,7 +585,7 @@ class MongoDBDumpLocks(gdb.Command):
         print("Running Hang Analyzer Supplement - MongoDBDumpLocks")
 
         main_binary_name = get_process_name()
-        if main_binary_name == "mongod":
+        if main_binary_name == "mongod" or main_binary_name == "mongod_with_debug":
             self.dump_mongod_locks()
         else:
             print("Not invoking mongod lock dump for: %s" % (main_binary_name))