diff options
Diffstat (limited to 'lsinitcpio')
| -rwxr-xr-x | lsinitcpio | 64 |
1 files changed, 52 insertions, 12 deletions
@@ -68,6 +68,57 @@ size_to_human() { }' } +detect_filetype() { + local offt + local kver_validator='^[[:digit:]]+(\.[[:digit:]]+)+' + + case $(hexdump -n 6 -e '"%c"' "$1") in + '070701') + # no compression + return + ;; + $'\xfd7zXZ') + echo 'xz' + return + ;; + esac + + if [[ $(hexdump -n 4 -e '"%c"' "$1") = $'\x89LZO' ]]; then + echo 'lzop' + return + fi + + if [[ $(hexdump -n 2 -e '"%x"' "$1") = '8b1f' ]]; then + echo 'gzip' + return + fi + + if [[ $(hexdump -n 3 -e '"%c"' "$1") == 'BZh' ]]; then + echo 'bzip2' + return + fi + + # lzma detection sucks and there's really no good way to + # do it without reading large portions of the stream. this + # check is good enough for GNU tar, apparently, so it's good + # enough for me. + if [[ $(hexdump -n 3 -e '"%x"' "$1") = '5d' ]]; then + echo 'lzma' + return + fi + + # still nothing? hrmm, maybe the user goofed and it's a kernel + offt=$(hexdump -s 526 -n 2 -e '"%0d"' "$1") + read kver _ < \ + <(dd if="$1" bs=1 count=127 skip=$(( offt + 0x200 )) 2>/dev/null) + if [[ $kver =~ $kver_validator ]]; then + die '%s is a kernel image, not an initramfs image!' "$1" + fi + + # out of ideas, we're done here. + die 'Unexpected file type. Are you sure %s is an initramfs?' "$1" +} + analyze_image() { local -a binaries explicitmod modules foundhooks hooks local kernver ratio columns=$(tput cols) image=$1 @@ -240,18 +291,7 @@ case $(( _optanalyze + _optlistcontents + _optshowconfig )) in esac # read compression type -case $(file -Lb "$_image") in - 'Linux kernel'*) - die '%s is a kernel image, not an initramfs image!' "$_image" ;; - data*|LZMA*) _compress=lzma ;; - gzip*) _compress=gzip ;; - bzip2*) _compress=bzip2 ;; - lzop*) _compress=lzop ;; - XZ*) _compress=xz ;; - 'ASCII cpio'*) : ;; - *) - die 'Unexpected file type. Are you sure this is an initramfs?' "$_image" ;; -esac +_compress=$(detect_filetype "$_image") || exit if (( _optanalyze )); then analyze_image "$_image" |