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std.debug.Dwarf: try to load the debuginfo from the debuginfod cache.

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The previous mecanism for linux distributions to delivers debug info into `/usr/lib/debug` no longer seems in use.
the current mecanism often is using `debuginfod` (https://sourceware.org/elfutils/Debuginfod.html)

This commit only tries to load already available debuginfo but does not try to make any download requests.
the user can manually run `debuginfod-find debuginfo PATH` to populate the cache.
This commit is contained in:
Xavier Bouchoux 2024-08-07 08:57:25 +02:00
parent 7e966de45e
commit cbdf9bf5ee
1 changed files with 40 additions and 0 deletions
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40
lib/std/debug/Dwarf.zig
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@ -2215,6 +2215,46 @@ pub const ElfModule = struct {
return error.MissingDebugInfo;
}
// $XDG_CACHE_HOME/debuginfod_client/<buildid>/debuginfo
// This only opportunisticly tries to load from the debuginfod cache, but doesn't try to populate it.
// One can manually run `debuginfod-find debuginfo PATH` to download the symbols
if (build_id) |id| blk: {
var debuginfod_dir: std.fs.Dir = switch (builtin.os.tag) {
.wasi, .windows => break :blk,
else => dir: {
if (std.posix.getenv("DEBUGINFOD_CACHE_PATH")) |path| {
break :dir std.fs.openDirAbsolute(path, .{}) catch break :blk;
}
if (std.posix.getenv("XDG_CACHE_HOME")) |cache_path| {
const path = std.fs.path.join(gpa, &[_][]const u8{ cache_path, "debuginfod_client" }) catch break :blk;
defer gpa.free(path);
break :dir std.fs.openDirAbsolute(path, .{}) catch break :blk;
}
if (std.posix.getenv("HOME")) |home_path| {
const path = std.fs.path.join(gpa, &[_][]const u8{ home_path, ".cache", "debuginfod_client" }) catch break :blk;
defer gpa.free(path);
break :dir std.fs.openDirAbsolute(path, .{}) catch break :blk;
}
break :blk;
},
};
defer debuginfod_dir.close();
const filename = std.fmt.allocPrint(
gpa,
"{s}/debuginfo",
.{std.fmt.fmtSliceHexLower(id)},
) catch break :blk;
defer gpa.free(filename);
const path: Path = .{
.root_dir = .{ .path = null, .handle = debuginfod_dir },
.sub_path = filename,
};
return loadPath(gpa, path, null, separate_debug_crc, &sections, mapped_mem) catch break :blk;
}
const global_debug_directories = [_][]const u8{
"/usr/lib/debug",
};