build-runtime.sh

   1 #! /bin/bash
   2
   3 if which clang >/dev/null; then
   4     CC=clang
   5 else
   6     CC=gcc
   7 fi
   8
   9 set -x
  10
  11 build_dir=$(mktemp -d)
  12 orig_cwd=$(pwd)
  13 repo_root=$(dirname $(readlink -f $0))
  14
  15 cd $repo_root
  16 git_version=$(git describe --tags --always --abbrev=7)
  17
  18 cleanup() {
  19     [ -d $build_dir ] && rm -r "$build_dir"
  20 }
  21
  22 trap cleanup EXIT
  23
  24 cd "$build_dir"
  25
  26 cp "$repo_root"/squashfs-tools/squashfs-tools/mksquashfs .
  27
  28 # Compile runtime but do not link
  29
  30 $CC -DVERSION_NUMBER=\"$git_version\" -I"$repo_root"/squashfuse/ -D_FILE_OFFSET_BITS=64 -g -Os -c "$repo_root"/runtime.c
  31
  32 # Prepare 1024 bytes of space for updateinformation
  33 printf '\0%.0s' {0..1023} > 1024_blank_bytes
  34
  35 objcopy --add-section .upd_info=1024_blank_bytes \
  36         --set-section-flags .upd_info=noload,readonly runtime.o runtime2.o
  37
  38 objcopy --add-section .sha256_sig=1024_blank_bytes \
  39         --set-section-flags .sha256_sig=noload,readonly runtime2.o runtime3.o
  40
  41 # Now statically link against libsquashfuse_ll, libsquashfuse and liblzma
  42 # and embed .upd_info and .sha256_sig sections
  43 $CC -o runtime "$repo_root"/elf.c "$repo_root"/notify.c "$repo_root"/getsection.c runtime3.o \
  44     "$repo_root"/squashfuse/.libs/libsquashfuse_ll.a "$repo_root"/squashfuse/.libs/libsquashfuse.a \
  45     "$repo_root"/squashfuse/.libs/libfuseprivate.a -L"$repo_root"/xz-5.2.3/build/lib \
  46     -Wl,-Bdynamic -lpthread -lz -Wl,-Bstatic -llzma -Wl,-Bdynamic -ldl
  47 $STRIP runtime
  48
  49 # Test if we can read it back
  50 readelf -x .upd_info runtime # hexdump
  51 readelf -p .upd_info runtime || true # string
  52
  53 # The raw updateinformation data can be read out manually like this:
  54 HEXOFFSET=$(objdump -h runtime | grep .upd_info | awk '{print $6}')
  55 HEXLENGTH=$(objdump -h runtime | grep .upd_info | awk '{print $3}')
  56 dd bs=1 if=runtime skip=$(($(echo 0x$HEXOFFSET)+0)) count=$(($(echo 0x$HEXLENGTH)+0)) | xxd
  57
  58 # Insert AppImage magic bytes
  59
  60 printf '\x41\x49\x02' | dd of=runtime bs=1 seek=8 count=3 conv=notrunc
  61
  62 # Convert runtime into a data object that can be embedded into appimagetool
  63
  64 ld -r -b binary -o data.o runtime
  65
  66 # Test if we can read it back
  67 readelf -x .upd_info runtime # hexdump
  68 readelf -p .upd_info runtime || true # string
  69
  70 # The raw updateinformation data can be read out manually like this:
  71 HEXOFFSET=$(objdump -h runtime | grep .upd_info | awk '{print $6}')
  72 HEXLENGTH=$(objdump -h runtime | grep .upd_info | awk '{print $3}')
  73 dd bs=1 if=runtime skip=$(($(echo 0x$HEXOFFSET)+0)) count=$(($(echo 0x$HEXLENGTH)+0)) | xxd
  74
  75 # Convert runtime into a data object that can be embedded into appimagetool
  76
  77 ld -r -b binary -o data.o runtime
  78
  79 cp data.o "$orig_cwd"/