rpm2cpio.sh 1.2 KB

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  1. #!/bin/sh -efu
  2. # This file comes from rpm 4.x distribution
  3. fatal() {
  4. echo "$*" >&2
  5. exit 1
  6. }
  7. pkg="$1"
  8. [ -n "$pkg" -a -e "$pkg" ] ||
  9. fatal "No package supplied"
  10. _dd() {
  11. local o="$1"; shift
  12. dd if="$pkg" skip="$o" iflag=skip_bytes status=none $*
  13. }
  14. calcsize() {
  15. offset=$(($1 + 8))
  16. local i b b0 b1 b2 b3 b4 b5 b6 b7
  17. i=0
  18. while [ $i -lt 8 ]; do
  19. b=$(_dd $(($offset + $i)) bs=1 count=1; echo X)
  20. b=${b%X}
  21. [ -z "$b" ] &&
  22. b="0" ||
  23. b="$(exec printf '%u\n' "'$b")"
  24. eval "b$i=\$b"
  25. i=$(($i + 1))
  26. done
  27. rsize=$((8 + ((($b0 << 24) + ($b1 << 16) + ($b2 << 8) + $b3) << 4) + ($b4 << 24) + ($b5 << 16) + ($b6 << 8) + $b7))
  28. offset=$(($offset + $rsize))
  29. }
  30. case "$(_dd 0 bs=8 count=1)" in
  31. "$(printf '\355\253\356\333')"*) ;; # '\xed\xab\xee\xdb'
  32. *) fatal "File doesn't look like rpm: $pkg" ;;
  33. esac
  34. calcsize 96
  35. sigsize=$rsize
  36. calcsize $(($offset + (8 - ($sigsize % 8)) % 8))
  37. hdrsize=$rsize
  38. case "$(_dd $offset bs=3 count=1)" in
  39. "$(printf '\102\132')"*) _dd $offset | bunzip2 ;; # '\x42\x5a'
  40. "$(printf '\037\213')"*) _dd $offset | gunzip ;; # '\x1f\x8b'
  41. "$(printf '\375\067')"*) _dd $offset | xzcat ;; # '\xfd\x37'
  42. "$(printf '\135\000')"*) _dd $offset | unlzma ;; # '\x5d\x00'
  43. *) fatal "Unrecognized rpm file: $pkg" ;;
  44. esac