nixos/lib/make-iso9660-image.sh

   1 # Remove the initial slash from a path, since genisofs likes it that way.
   2 stripSlash() {
   3     res="$1"
   4     if test "${res:0:1}" = /; then res=${res:1}; fi
   5 }
   6
   7 # Escape potential equal signs (=) with backslash (\=)
   8 escapeEquals() {
   9     echo "$1" | sed -e 's/\\/\\\\/g' -e 's/=/\\=/g'
  10 }
  11
  12 # Queues an file/directory to be placed on the ISO.
  13 # An entry consists of a local source path (2) and
  14 # a destination path on the ISO (1).
  15 addPath() {
  16     target="$1"
  17     source="$2"
  18     echo "$(escapeEquals "$target")=$(escapeEquals "$source")" >> pathlist
  19 }
  20
  21 stripSlash "$bootImage"; bootImage="$res"
  22
  23
  24 if test -n "$bootable"; then
  25
  26     # The -boot-info-table option modifies the $bootImage file, so
  27     # find it in `contents' and make a copy of it (since the original
  28     # is read-only in the Nix store...).
  29     for ((i = 0; i < ${#targets[@]}; i++)); do
  30         stripSlash "${targets[$i]}"
  31         if test "$res" = "$bootImage"; then
  32             echo "copying the boot image ${sources[$i]}"
  33             cp "${sources[$i]}" boot.img
  34             chmod u+w boot.img
  35             sources[$i]=boot.img
  36         fi
  37     done
  38
  39     isoBootFlags="-eltorito-boot ${bootImage}
  40                   -eltorito-catalog .boot.cat
  41                   -no-emul-boot -boot-load-size 4 -boot-info-table
  42                   --sort-weight 1 /isolinux" # Make sure isolinux is near the beginning of the ISO
  43 fi
  44
  45 if test -n "$usbBootable"; then
  46     usbBootFlags="-isohybrid-mbr ${isohybridMbrImage}"
  47 fi
  48
  49 if test -n "$efiBootable"; then
  50     efiBootFlags="-eltorito-alt-boot
  51                   -e $efiBootImage
  52                   -no-emul-boot
  53                   -isohybrid-gpt-basdat"
  54 fi
  55
  56 touch pathlist
  57
  58
  59 # Add the individual files.
  60 for ((i = 0; i < ${#targets[@]}; i++)); do
  61     stripSlash "${targets[$i]}"
  62     addPath "$res" "${sources[$i]}"
  63 done
  64
  65
  66 # Add the closures of the top-level store objects.
  67 for i in $(< $closureInfo/store-paths); do
  68     addPath "${i:1}" "$i"
  69 done
  70
  71 # If needed, build a squashfs and add that
  72 if [[ -n "$squashfsCommand" ]]; then
  73     (out="nix-store.squashfs" eval "$squashfsCommand")
  74     addPath "nix-store.squashfs" "nix-store.squashfs"
  75 fi
  76
  77 # Also include a manifest of the closures in a format suitable for
  78 # nix-store --load-db.
  79 if [[ ${#objects[*]} != 0 ]]; then
  80     cp $closureInfo/registration nix-path-registration
  81     addPath "nix-path-registration" "nix-path-registration"
  82 fi
  83
  84
  85 # Add symlinks to the top-level store objects.
  86 for ((n = 0; n < ${#objects[*]}; n++)); do
  87     object=${objects[$n]}
  88     symlink=${symlinks[$n]}
  89     if test "$symlink" != "none"; then
  90         mkdir -p $(dirname ./$symlink)
  91         ln -s $object ./$symlink
  92         addPath "$symlink" "./$symlink"
  93     fi
  94 done
  95
  96 mkdir -p $out/iso
  97
  98 # daed2280-b91e-42c0-aed6-82c825ca41f3 is an arbitrary namespace, to prevent
  99 # independent applications from generating the same UUID for the same value.
 100 # (the chance of that being problematic seem pretty slim here, but that's how
 101 # version-5 UUID's work)
 102 xorriso="xorriso
 103  -boot_image any gpt_disk_guid=$(uuid -v 5 daed2280-b91e-42c0-aed6-82c825ca41f3 $out | tr -d -)
 104  -volume_date all_file_dates =$SOURCE_DATE_EPOCH
 105  -as mkisofs
 106  -iso-level 3
 107  -volid ${volumeID}
 108  -appid nixos
 109  -publisher nixos
 110  -graft-points
 111  -full-iso9660-filenames
 112  -joliet
 113  ${isoBootFlags}
 114  ${usbBootFlags}
 115  ${efiBootFlags}
 116  -r
 117  -path-list pathlist
 118  --sort-weight 0 /
 119 "
 120
 121 $xorriso -output $out/iso/$isoName
 122
 123 if test -n "$compressImage"; then
 124     echo "Compressing image..."
 125     zstd -T$NIX_BUILD_CORES --rm $out/iso/$isoName
 126 fi
 127
 128 mkdir -p $out/nix-support
 129 echo $system > $out/nix-support/system
 130
 131 if test -n "$compressImage"; then
 132     echo "file iso $out/iso/$isoName.zst" >> $out/nix-support/hydra-build-products
 133 else
 134     echo "file iso $out/iso/$isoName" >> $out/nix-support/hydra-build-products
 135 fi