#!/bin/bash

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#find-debuginfo.sh - automagically generate debug info and file list

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#for inclusion in an rpm spec file.

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#

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# Usage: find-debuginfo.sh [--strict-build-id] [-g] [-r] [-m] [-i] [-n]

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# [--keep-section SECTION] [--remove-section SECTION]

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# [--g-libs]

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# [-j N] [--jobs N]

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# [-o debugfiles.list]

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# [-S debugsourcefiles.list]

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# [--run-dwz] [--dwz-low-mem-die-limit N]

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# [--dwz-max-die-limit N]

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# [--build-id-seed SEED]

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# [--unique-debug-suffix SUFFIX]

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# [--unique-debug-src-base BASE]

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# [[-l filelist]... [-p 'pattern'] -o debuginfo.list]

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# [builddir]

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#

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# The -g flag says to use strip -g instead of full strip on DSOs or EXEs.

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# The --g-libs flag says to use strip -g instead of full strip ONLY on DSOs.

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# Options -g and --g-libs are mutually exclusive.

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# The -r flag says to use eu-strip --reloc-debug-sections.

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# Use --keep-section SECTION or --remove-section SECTION to explicitly

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# keep a (non-allocated) section in the main executable or explicitly

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# remove it into the .debug file. SECTION is an extended wildcard pattern.

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# Both options can be given more than once.

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#

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# The --strict-build-id flag says to exit with failure status if

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# any ELF binary processed fails to contain a build-id note.

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# The -m flag says to include a .gnu_debugdata section in the main binary.

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# The -i flag says to include a .gdb_index section in the .debug file.

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# The -n flag says to not recompute the build-id.

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#

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# The -j, --jobs N option will spawn N processes to do the debuginfo

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# extraction in parallel.

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#

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# A single -o switch before any -l or -p switches simply renames

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# the primary output file from debugfiles.list to something else.

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# A -o switch that follows a -p switch or some -l switches produces

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# an additional output file with the debuginfo for the files in

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# the -l filelist file, or whose names match the -p pattern.

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# The -p argument is an grep -E -style regexp matching the a file name,

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# and must not use anchors (^ or $).

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#

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# The --run-dwz flag instructs find-debuginfo.sh to run the dwz utility

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# if available, and --dwz-low-mem-die-limit and --dwz-max-die-limit

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# provide detailed limits. See dwz(1) -l and -L option for details.

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#

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# If --build-id-seed SEED is given then debugedit is called to

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# update the build-ids it finds adding the SEED as seed to recalculate

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# the build-id hash. This makes sure the build-ids in the ELF files

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# are unique between versions and releases of the same package.

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# (Use --build-id-seed "%{VERSION}-%{RELEASE}".)

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#

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# If --unique-debug-suffix SUFFIX is given then the debug files created

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# for <FILE> will be named <FILE>-<SUFFIX>.debug. This makes sure .debug

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# are unique between package version, release and architecture.

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# (Use --unique-debug-suffix "-%{VERSION}-%{RELEASE}.%{_arch}".)

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#

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# If --unique-debug-src-base BASE is given then the source directory

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# will be called /usr/debug/src/<BASE>. This makes sure the debug source

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# directories are unique between package version, release and architecture.

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# (Use --unique-debug-src-base "%{name}-%{VERSION}-%{RELEASE}.%{_arch}".)

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#

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# All file names in switches are relative to builddir (. if not given).

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#

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# Figure out where we are installed so we can call other helper scripts.

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lib_rpm_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

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# With -g arg, pass it to strip on libraries or executables.

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strip_g=false

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# With --g-libs arg, pass it to strip on libraries.

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strip_glibs=false

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# with -r arg, pass --reloc-debug-sections to eu-strip.

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strip_r=false

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# keep or remove arguments to eu-strip.

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keep_remove_args=

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# with -m arg, add minimal debuginfo to binary.

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include_minidebug=false

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# with -i arg, add GDB index to .debug file.

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include_gdb_index=false

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# Barf on missing build IDs.

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strict=false

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# Do not recompute build IDs.

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no_recompute_build_id=false

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# DWZ parameters.

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run_dwz=false

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dwz_low_mem_die_limit=

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dwz_max_die_limit=

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# build id seed given by the --build-id-seed option

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build_id_seed=

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# Arch given by --unique-debug-arch

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unique_debug_suffix=

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# Base given by --unique-debug-src-base

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unique_debug_src_base=

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# Number of parallel jobs to spawn

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n_jobs=1

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BUILDDIR=.

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out=debugfiles.list

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srcout=

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nout=0

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while [ $# -gt 0 ]; do

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case "$1" in

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--strict-build-id)

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strict=true

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;;

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--run-dwz)

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run_dwz=true

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;;

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--dwz-low-mem-die-limit)

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dwz_low_mem_die_limit=$2

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shift

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;;

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--dwz-max-die-limit)

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dwz_max_die_limit=$2

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shift

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;;

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--build-id-seed)

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build_id_seed=$2

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shift

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;;

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--unique-debug-suffix)

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unique_debug_suffix=$2

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shift

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;;

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--unique-debug-src-base)

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unique_debug_src_base=$2

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shift

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;;

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--g-libs)

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strip_glibs=true

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;;

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-g)

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strip_g=true

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;;

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-m)

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include_minidebug=true

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;;

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-n)

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no_recompute_build_id=true

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;;

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-i)

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include_gdb_index=true

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;;

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-o)

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if [ -z "${lists[$nout]}" -a -z "${ptns[$nout]}" ]; then

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out=$2

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else

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outs[$nout]=$2

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((nout++))

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fi

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shift

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;;

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-l)

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lists[$nout]="${lists[$nout]} $2"

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shift

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;;

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-p)

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ptns[$nout]=$2

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shift

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;;

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-r)

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strip_r=true

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;;

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--keep-section)

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keep_remove_args="${keep_remove_args} --keep-section $2"

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shift

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;;

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--remove-section)

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keep_remove_args="${keep_remove_args} --remove-section $2"

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shift

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;;

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-j)

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n_jobs=$2

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shift

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;;

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-j*)

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n_jobs=${1#-j}

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;;

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--jobs)

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n_jobs=$2

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shift

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;;

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-S)

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srcout=$2

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shift

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;;

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*)

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BUILDDIR=$1

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shift

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break

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;;

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esac

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shift

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done

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if test -n "$build_id_seed" -a "$no_recompute_build_id" = "true"; then

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echo >&2 "*** ERROR: --build-id-seed (unique build-ids) and -n (do not recompute build-id) cannot be used together"

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exit 2

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fi

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if [ "$strip_g" = "true" ] && [ "$strip_glibs" = "true" ]; then

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echo >&2 "*** ERROR: -g and --g-libs cannot be used together"

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exit 2

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fi

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i=0

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while ((i < nout)); do

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outs[$i]="$BUILDDIR/${outs[$i]}"

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l=''

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for f in ${lists[$i]}; do

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l="$l $BUILDDIR/$f"

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done

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lists[$i]=$l

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((++i))

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done

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LISTFILE="$BUILDDIR/$out"

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SOURCEFILE="$BUILDDIR/debugsources.list"

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LINKSFILE="$BUILDDIR/debuglinks.list"

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ELFBINSFILE="$BUILDDIR/elfbins.list"

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> "$SOURCEFILE"

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> "$LISTFILE"

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> "$LINKSFILE"

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> "$ELFBINSFILE"

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debugdir="${RPM_BUILD_ROOT}/usr/lib/debug"

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strip_to_debug()

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{

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local g=

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local r=

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$strip_r && r=--reloc-debug-sections

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$strip_g && case "$(file -bi "$2")" in

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application/x-sharedlib*) g=-g ;;

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application/x-executable*) g=-g ;;

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application/x-pie-executable*) g=-g ;;

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esac

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$strip_glibs && case "$(file -bi "$2")" in

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application/x-sharedlib*) g=-g ;;

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esac

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eu-strip --remove-comment $r $g ${keep_remove_args} -f "$1" "$2" || exit

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chmod 444 "$1" || exit

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}

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add_minidebug()

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{

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local debuginfo="$1"

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local binary="$2"

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local dynsyms=`mktemp`

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local funcsyms=`mktemp`

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local keep_symbols=`mktemp`

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local mini_debuginfo=`mktemp`

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# In the minisymtab we don't need the .debug_ sections (already removed

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# by -S) but also not other non-allocated PROGBITS, NOTE or NOBITS sections.

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# List and remove them explicitly. We do want to keep the allocated,

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# symbol and NOBITS sections so cannot use --keep-only because that is

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# too aggressive. Field $2 is the section name, $3 is the section type

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# and $8 are the section flags.

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local remove_sections=`readelf -W -S "$debuginfo" \

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| awk '{ if (index($2,".debug_") != 1 \

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&& ($3 == "PROGBITS" || $3 == "NOTE" || $3 == "NOBITS") \

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&& index($8,"A") == 0) \

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printf "--remove-section "$2" " }'`

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# Extract the dynamic symbols from the main binary, there is no need to also have these

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# in the normal symbol table

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nm -D "$binary" --format=posix --defined-only | awk '{ print $1 }' | sort > "$dynsyms"

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# Extract all the text (i.e. function) symbols from the debuginfo

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# Use format sysv to make sure we can match against the actual ELF FUNC

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# symbol type. The binutils nm posix format symbol type chars are

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# ambigous for architectures that might use function descriptors.

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nm "$debuginfo" --format=sysv --defined-only | awk -F \| '{ if ($4 ~ "FUNC") print $1 }' | sort > "$funcsyms"

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# Keep all the function symbols not already in the dynamic symbol table

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comm -13 "$dynsyms" "$funcsyms" > "$keep_symbols"

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# Copy the full debuginfo, keeping only a minumal set of symbols and removing some unnecessary sections

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objcopy -S $remove_sections --keep-symbols="$keep_symbols" "$debuginfo" "$mini_debuginfo" &> /dev/null

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#Inject the compressed data into the .gnu_debugdata section of the original binary

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xz "$mini_debuginfo"

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mini_debuginfo="${mini_debuginfo}.xz"

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objcopy --add-section .gnu_debugdata="$mini_debuginfo" "$binary"

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rm -f "$dynsyms" "$funcsyms" "$keep_symbols" "$mini_debuginfo"

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}

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# Make a relative symlink to $1 called $3$2

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shopt -s extglob

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link_relative()

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{

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local t="$1" f="$2" pfx="$3"

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local fn="${f#/}" tn="${t#/}"

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local fd td d

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while fd="${fn%%/*}"; td="${tn%%/*}"; [ "$fd" = "$td" ]; do

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fn="${fn#*/}"

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tn="${tn#*/}"

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done

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d="${fn%/*}"

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if [ "$d" != "$fn" ]; then

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d="${d//+([!\/])/..}"

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tn="${d}/${tn}"

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fi

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mkdir -p "$(dirname "$pfx$f")" && ln -snf "$tn" "$pfx$f"

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}

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# Make a symlink in /usr/lib/debug/$2 to $1

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debug_link()

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{

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local l="/usr/lib/debug$2"

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local t="$1"

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echo >> "$LINKSFILE" "$l $t"

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link_relative "$t" "$l" "$RPM_BUILD_ROOT"

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}

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get_debugfn()

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{

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dn=$(dirname "${1#$RPM_BUILD_ROOT}")

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bn=$(basename "$1" .debug)${unique_debug_suffix}.debug

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debugdn=${debugdir}${dn}

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debugfn=${debugdn}/${bn}

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}

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set -o pipefail

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strict_error=ERROR

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$strict || strict_error=WARNING

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temp=$(mktemp -d ${TMPDIR:-/tmp}/find-debuginfo.XXXXXX)

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trap 'rm -rf "$temp"' EXIT

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# Build a list of unstripped ELF files and their hardlinks

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touch "$temp/primary"

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find "$RPM_BUILD_ROOT" ! -path "${debugdir}/*.debug" -type f \

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\( -perm -0100 -or -perm -0010 -or -perm -0001 \) \

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-print | LC_ALL=C sort |

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file -N -f - | sed -n -e 's/^\(.*\):[ ]*.*ELF.*, not stripped.*/\1/p' |

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xargs --no-run-if-empty stat -c '%h %D_%i %n' |

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while read nlinks inum f; do

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if [ $nlinks -gt 1 ]; then

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var=seen_$inum

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if test -n "${!var}"; then

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echo "$inum $f" >>"$temp/linked"

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continue

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else

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read "$var" < <(echo 1)

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fi

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fi

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echo "$nlinks $inum $f" >>"$temp/primary"

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done

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# Strip ELF binaries

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do_file()

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{

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local nlinks=$1 inum=$2 f=$3 id link linked

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get_debugfn "$f"

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[ -f "${debugfn}" ] && return

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echo "extracting debug info from $f"

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# See also cpio SOURCEFILE copy. Directories must match up.

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debug_base_name="$RPM_BUILD_DIR"

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debug_dest_name="/usr/src/debug"

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if [ ! -z "$unique_debug_src_base" ]; then

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debug_base_name="$BUILDDIR"

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debug_dest_name="/usr/src/debug/${unique_debug_src_base}"

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fi

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no_recompute=

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if [ "$no_recompute_build_id" = "true" ]; then

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no_recompute="-n"

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fi

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id=$(${lib_rpm_dir}/debugedit -b "$debug_base_name" -d "$debug_dest_name" \

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$no_recompute -i \

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${build_id_seed:+--build-id-seed="$build_id_seed"} \

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-l "$SOURCEFILE" "$f") || exit

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if [ -z "$id" ]; then

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echo >&2 "*** ${strict_error}: No build ID note found in $f"

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$strict && exit 2

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fi

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# Add .gdb_index if requested.

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if $include_gdb_index; then

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if type gdb-add-index >/dev/null 2>&1; then

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gdb-add-index "$f"

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else

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echo >&2 "*** ERROR: GDB index requested, but no gdb-add-index installed"

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exit 2

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fi

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fi

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# Compress any annobin notes in the original binary.

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# Ignore any errors, since older objcopy don't support --merge-notes.

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objcopy --merge-notes "$f" 2>/dev/null || true

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# A binary already copied into /usr/lib/debug doesn't get stripped,

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# just has its file names collected and adjusted.

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case "$dn" in

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/usr/lib/debug/*)

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return ;;

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esac

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mkdir -p "${debugdn}"

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if test -w "$f"; then

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strip_to_debug "${debugfn}" "$f"

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else

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chmod u+w "$f"

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strip_to_debug "${debugfn}" "$f"

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chmod u-w "$f"

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fi

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# strip -g implies we have full symtab, don't add mini symtab in that case.

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# It only makes sense to add a minisymtab for executables and shared

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# libraries. Other executable ELF files (like kernel modules) don't need it.

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if [ "$include_minidebug" = "true" -a "$strip_g" = "false" ]; then

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skip_mini=true

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if [ "$strip_glibs" = "false" ]; then

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case "$(file -bi "$f")" in

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application/x-sharedlib*) skip_mini=false ;;

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esac

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fi

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case "$(file -bi "$f")" in

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application/x-executable*) skip_mini=false ;;

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application/x-pie-executable*) skip_mini=false ;;

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esac

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$skip_mini || add_minidebug "${debugfn}" "$f"

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fi

[442] Fix | Delete

[443] Fix | Delete

echo "./${f#$RPM_BUILD_ROOT}" >> "$ELFBINSFILE"

[444] Fix | Delete

[445] Fix | Delete

# If this file has multiple links, make the corresponding .debug files

[446] Fix | Delete

# all links to one file too.

[447] Fix | Delete

if [ $nlinks -gt 1 ]; then

[448] Fix | Delete

grep "^$inum " "$temp/linked" | while read inum linked; do

[449] Fix | Delete

link=$debugfn

[450] Fix | Delete

get_debugfn "$linked"

[451] Fix | Delete

echo "hard linked $link to $debugfn"

[452] Fix | Delete

mkdir -p "$(dirname "$debugfn")" && ln -nf "$link" "$debugfn"

[453] Fix | Delete

done

[454] Fix | Delete

fi

[455] Fix | Delete

}

[456] Fix | Delete

[457] Fix | Delete

# 16^6 - 1 or about 16 million files

[458] Fix | Delete

FILENUM_DIGITS=6

[459] Fix | Delete

run_job()

[460] Fix | Delete

{

[461] Fix | Delete

local jobid=$1 filenum

[462] Fix | Delete

local SOURCEFILE=$temp/debugsources.$jobid ELFBINSFILE=$temp/elfbins.$jobid

[463] Fix | Delete

[464] Fix | Delete

>"$SOURCEFILE"

[465] Fix | Delete

>"$ELFBINSFILE"

[466] Fix | Delete

# can't use read -n <n>, because it reads bytes one by one, allowing for

[467] Fix | Delete

# races

[468] Fix | Delete

while :; do

[469] Fix | Delete

filenum=$(dd bs=$(( FILENUM_DIGITS + 1 )) count=1 status=none)

[470] Fix | Delete

if test -z "$filenum"; then

[471] Fix | Delete

break

[472] Fix | Delete

fi

[473] Fix | Delete

do_file $(sed -n "$(( 0x$filenum )) p" "$temp/primary")

[474] Fix | Delete

done

[475] Fix | Delete

echo 0 >"$temp/res.$jobid"

[476] Fix | Delete

}

[477] Fix | Delete

[478] Fix | Delete

n_files=$(wc -l <"$temp/primary")

[479] Fix | Delete

if [ $n_jobs -gt $n_files ]; then

[480] Fix | Delete

n_jobs=$n_files

[481] Fix | Delete

fi

[482] Fix | Delete

if [ $n_jobs -le 1 ]; then

[483] Fix | Delete

while read nlinks inum f; do

[484] Fix | Delete

do_file "$nlinks" "$inum" "$f"

[485] Fix | Delete

done <"$temp/primary"

[486] Fix | Delete

else

[487] Fix | Delete

for ((i = 1; i <= n_files; i++)); do

[488] Fix | Delete

printf "%0${FILENUM_DIGITS}x\\n" $i

[489] Fix | Delete

done | (

[490] Fix | Delete

exec 3<&0

[491] Fix | Delete

for ((i = 0; i < n_jobs; i++)); do

[492] Fix | Delete

# The shell redirects stdin to /dev/null for background jobs. Work

[493] Fix | Delete

# around this by duplicating fd 0

[494] Fix | Delete

run_job $i <&3 &

[495] Fix | Delete

done

[496] Fix | Delete

wait

[497] Fix | Delete

)

[498] Fix | Delete

for f in "$temp"/res.*; do

[499] Fix | Delete