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export NIX_SET_BUILD_ID=1
export NIX_LDFLAGS+=" --compress-debug-sections=zlib"
export NIX_CFLAGS_COMPILE+=" -ggdb -Wa,--compress-debug-sections"
export NIX_RUSTFLAGS+=" -g -C strip=none"
cksumAlgo=sha256
fixupOutputHooks+=(_separateDebugInfo)
postUnpackHooks+=(_recordPristineSourceHashes)
_recordPristineSourceHashes() {
# shellcheck disable=2154
[ -e "$sourceRoot" ] || return 0
local checksumFileName=__nix_source_checksums
echo "separate-debug-info: recording checksum of source files for debug support..."
find "$sourceRoot" -type f -exec cksum -a "$cksumAlgo" '{}' \+ > "$checksumFileName"
recordedSourceChecksumsFileName="$(readlink -f "$checksumFileName")"
}
_separateDebugInfo() {
# shellcheck disable=2154
[ -e "$prefix" ] || return 0
local debugOutput="${debug:-$out}"
if [ "$prefix" = "$debugOutput" ]; then return 0; fi
# in case there is nothing to strip, don't fail the build
mkdir -p "$debugOutput"
local dst="$debugOutput/lib/debug/.build-id"
local source
local sourceOverlay
# shellcheck disable=2154
if [ -e "$src" ]; then
source="$src"
if [ -n "${recordedSourceChecksumsFileName:-}" ]; then
sourceOverlay="$debugOutput/src/overlay"
else
sourceOverlay=""
fi
else
source=""
sourceOverlay=""
fi
# Find executables and dynamic libraries.
local i
while IFS= read -r -d $'\0' i; do
if ! isELF "$i"; then continue; fi
[ -z "${READELF:-}" ] && echo "_separateDebugInfo: '\$READELF' variable is empty, skipping." 1>&2 && break
[ -z "${OBJCOPY:-}" ] && echo "_separateDebugInfo: '\$OBJCOPY' variable is empty, skipping." 1>&2 && break
# Extract the Build ID. FIXME: there's probably a cleaner way.
local id
id="$($READELF -n "$i" | sed 's/.*Build ID: \([0-9a-f]*\).*/\1/; t; d')"
if [ "${#id}" != 40 ]; then
echo "could not find build ID of $i, skipping" >&2
continue
fi
# Extract the debug info.
echo "separating debug info from $i (build ID $id)"
local debuginfoDir="$dst/${id:0:2}"
local buildIdPrefix="$debuginfoDir/${id:2}"
local debuginfoFile="$buildIdPrefix.debug"
local executableSymlink="$buildIdPrefix.executable"
local sourceSymlink="$buildIdPrefix.source"
local sourceOverlaySymlink="$buildIdPrefix.sourceoverlay"
mkdir -p "$debuginfoDir"
if [ -f "$debuginfoFile" ]; then
echo "separate-debug-info: warning: multiple files with build id $id found, overwriting"
fi
# This may fail, e.g. if the binary is for a different
# architecture than we're building for. (This happens with
# firmware blobs in QEMU.)
if $OBJCOPY --only-keep-debug "$i" "$debuginfoFile"; then
# If we succeeded, also a create a symlink <original-name>.debug.
ln -sfn "$debuginfoFile" "$dst/../$(basename "$i")"
# also create a symlink mapping the build-id to the original elf file and the source
# debuginfod protocol relies on it
ln -sfn "$i" "$executableSymlink"
if [ -n "$source" ]; then
ln -sfn "$source" "$sourceSymlink"
fi
if [ -n "$sourceOverlay" ]; then
# create it lazily
if [ ! -d "$sourceOverlay" ]; then
echo "separate-debug-info: copying patched source files to $sourceOverlay..."
mkdir -p "$sourceOverlay"
pushd "$(dirname "$recordedSourceChecksumsFileName")" || { echo "separate-debug-info: failed to cd parent directory of $recordedSourceChecksumsFileName"; return 1; }
while IFS= read -r -d $'\0' modifiedSourceFile; do
if [ -z "$modifiedSourceFile" ]; then
continue
fi
# this can happen with files with '\n' in their name
if [ ! -f "$modifiedSourceFile" ]; then
echo "separate-debug-info: cannot save modified source file $modifiedSourceFile: does not exist. ignoring"
continue
fi
mkdir -p "$sourceOverlay/$(dirname "$modifiedSourceFile")"
cp -v "$modifiedSourceFile" "$sourceOverlay/$modifiedSourceFile"
done < <(LANG=C cksum -a "$cksumAlgo" --check --ignore-missing --quiet "$recordedSourceChecksumsFileName" 2>&1 | sed -n -e 's/: FAILED$/\x00/p' | sed -z -e 's/^\n//')
popd || { echo "separate-debug-info: failed to popd" ; return 1; }
fi
ln -sfn "$sourceOverlay" "$sourceOverlaySymlink"
fi
else
# If we failed, try to clean up unnecessary directories
rmdir -p "$dst/${id:0:2}" --ignore-fail-on-non-empty
fi
done < <(find "$prefix" -type f -print0 | sort -z)
}
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