mirror of
https://github.com/revng/revng
synced 2026-06-21 14:07:57 +00:00
Giacomo Vercesi
5d582a2eec
Rework how the cache folder for debug information is handled. This commit introduces an additional environment variable, `REVNG_CACHE_DIR` that allows overriding where semi-disposable files will be stored.
54 lines
1.8 KiB
Python
54 lines
1.8 KiB
Python
#
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# This file is distributed under the MIT License. See LICENSE.md for details.
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#
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from elftools.elf.elffile import ELFFile
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from elftools.elf.sections import NoteSection
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from .common import cache_directory, download_file, log
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def parse_build_id(file):
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for section in file.iter_sections():
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if not isinstance(section, NoteSection):
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continue
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for note in section.iter_notes():
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desc = note["n_desc"]
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if note["n_type"] != "NT_GNU_BUILD_ID":
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continue
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return desc
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return None
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def fetch_dwarf(file: ELFFile, file_path, urls):
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log("Looking for Debugging Information for an ELF")
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build_id = parse_build_id(file)
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if build_id is None:
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# If we cannot parse the build id, we cannot fetch debug info.
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log("Parsing build-id failed")
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return None
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log("BUILD-ID: " + build_id)
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# Find debug info on the web as `debuginfod` does.
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# Ensure that we have created `$cache_directory/debug-symbols/elf` directory.
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path_to_revng_elf_debug_data = cache_directory() / "debug-symbols" / "elf"
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path_to_revng_elf_debug_data.mkdir(parents=True, exist_ok=True)
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directory_path_to_download = path_to_revng_elf_debug_data / build_id
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directory_path_to_download.mkdir(exist_ok=True)
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debug_file_to_download = directory_path_to_download / "debug"
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if debug_file_to_download.exists():
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log("Already downloaded debug file from web")
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return debug_file_to_download
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log("Trying to find the debug info on the web")
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for url in urls:
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debug_info_url = url + "/buildid/" + build_id + "/debuginfo"
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log(f"Trying to download from {debug_info_url}")
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if download_file(debug_info_url, str(debug_file_to_download)):
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return debug_file_to_download
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return None
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