Pre-populate LLDB module cache with existing binaries

lldb-precache

#!/bin/bash
set -e

if [ "$#" -lt 1 ]; then
    echo "Usage: $0 <executable> [remote-linux]"
    exit 1
fi

executable_path="$1"
echo "Pre-caching executable: $executable_path"
build_id_str=$(readelf -n "$executable_path" | grep "Build")
build_id=$(echo "$build_id_str" | awk '{print $NF}')
echo "Build ID: $build_id"
build_id_subdir=$(echo "$build_id" | sed -E 's/(.{8})(.{4})(.{4})(.{4})(.{12})(.{8})/\1-\2-\3-\4-\5-\6/' | tr 'a-f' 'A-F')

# Default to remote-linux
remote="${2:-remote-linux}"
lldb_cache_dir="$HOME/.lldb/module_cache/$remote/.cache"
echo "Cache root for remote '$remote': $lldb_cache_dir"

# Don't mess with existing cache files
build_id_fullpath="$lldb_cache_dir/$build_id_subdir"
if [ -d "$build_id_fullpath" ]; then
    echo "Cache directory '$build_id_fullpath' already exists. Please remove it manually and try again."
    exit 1
fi

mkdir -p "$build_id_fullpath"

executable_name=$(basename "$executable_path")
echo "Copy executable to cache: $build_id_fullpath/$executable_name"
cp "$executable_path" "$build_id_fullpath/$executable_name"

echo "Done"

stdout.log

$ lldb-precache build-ubuntu20.04-aarch32/bin/clang-repl
Pre-caching executable: build-ubuntu20.04-aarch32/bin/clang-repl
Build ID: 86e7de5facfac1e6a55a50003c4a44dd7bf9a10d
Cache root for remote 'remote-linux': /home/ez/.lldb/module_cache/remote-linux/.cache
Copy executable to cache: /home/ez/.lldb/module_cache/remote-linux/.cache/86E7DE5F-ACFA-C1E6-A55A-50003C4A44DD-7BF9A10D/clang-repl
Done