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Diffstat (limited to 't/lib-pack.sh')
| -rw-r--r-- | t/lib-pack.sh | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/t/lib-pack.sh b/t/lib-pack.sh new file mode 100644 index 0000000..bb8938c --- /dev/null +++ b/t/lib-pack.sh @@ -0,0 +1,140 @@ +# Support routines for hand-crafting weird or malicious packs. +# +# You can make a complete pack like: +# +# pack_header 2 >foo.pack && +# pack_obj e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 >>foo.pack && +# pack_obj e68fe8129b546b101aee9510c5328e7f21ca1d18 >>foo.pack && +# pack_trailer foo.pack + +# Print the big-endian 4-byte octal representation of $1 +uint32_octal () { + n=$1 + printf '\\%o' $(($n / 16777216)); n=$((n % 16777216)) + printf '\\%o' $(($n / 65536)); n=$((n % 65536)) + printf '\\%o' $(($n / 256)); n=$((n % 256)) + printf '\\%o' $(($n )); +} + +# Print the big-endian 4-byte binary representation of $1 +uint32_binary () { + printf "$(uint32_octal "$1")" +} + +# Print a pack header, version 2, for a pack with $1 objects +pack_header () { + printf 'PACK' && + printf '\0\0\0\2' && + uint32_binary "$1" +} + +# Print the pack data for object $1, as a delta against object $2 (or as a full +# object if $2 is missing or empty). The output is suitable for including +# directly in the packfile, and represents the entirety of the object entry. +# Doing this on the fly (especially picking your deltas) is quite tricky, so we +# have hardcoded some well-known objects. See the case statements below for the +# complete list. +pack_obj () { + case "$1" in + # empty blob + $EMPTY_BLOB) + case "$2" in + '') + printf '\060\170\234\003\0\0\0\0\1' + return + ;; + esac + ;; + + # blob containing "\7\76" + $(test_oid packlib_7_76)) + case "$2" in + '') + printf '\062\170\234\143\267\3\0\0\116\0\106' + return + ;; + 01d7713666f4de822776c7622c10f1b07de280dc) + printf '\165\1\327\161\66\146\364\336\202\47\166' && + printf '\307\142\54\20\361\260\175\342\200\334\170' && + printf '\234\143\142\142\142\267\003\0\0\151\0\114' + return + ;; + 37c8e2c15bb22b912e59b43fd51a4f7e9465ed0b5084c5a1411d991cbe630683) + printf '\165\67\310\342\301\133\262\53\221\56\131' && + printf '\264\77\325\32\117\176\224\145\355\13\120' && + printf '\204\305\241\101\35\231\34\276\143\6\203\170' && + printf '\234\143\142\142\142\267\003\0\0\151\0\114' + return + ;; + esac + ;; + + # blob containing "\7\0" + $(test_oid packlib_7_0)) + case "$2" in + '') + printf '\062\170\234\143\147\0\0\0\20\0\10' + return + ;; + e68fe8129b546b101aee9510c5328e7f21ca1d18) + printf '\165\346\217\350\22\233\124\153\20\32\356' && + printf '\225\20\305\62\216\177\41\312\35\30\170\234' && + printf '\143\142\142\142\147\0\0\0\53\0\16' + return + ;; + 5d8e6fc40f2dab00e6983a48523fe57e621f46434cb58dbd4422fba03380d886) + printf '\165\135\216\157\304\17\55\253\0\346\230\72' && + printf '\110\122\77\345\176\142\37\106\103\114\265' && + printf '\215\275\104\42\373\240\63\200\330\206\170\234' && + printf '\143\142\142\142\147\0\0\0\53\0\16' + return + ;; + esac + ;; + # blob containing "\3\326" + 471819e8c52bf11513f100b2810a8aa0622d5cd3d1c913758a071dd4b3bad8fe) + case "$2" in + '') + printf '\062\170\234\143\276\006\000\000\336\000\332' + return + ;; + esac + esac + + # If it's not a delta, we can convince pack-objects to generate a pack + # with just our entry, and then strip off the header (12 bytes) and + # trailer (20 bytes). + if test -z "$2" + then + echo "$1" | git pack-objects --stdout >pack_obj.tmp && + size=$(wc -c <pack_obj.tmp) && + dd if=pack_obj.tmp bs=1 count=$((size - $(test_oid rawsz) - 12)) skip=12 && + rm -f pack_obj.tmp + return + fi + + echo >&2 "BUG: don't know how to print $1${2:+ (from $2)}" + return 1 +} + +# Compute and append pack trailer to "$1" +pack_trailer () { + test-tool $(test_oid algo) -b <"$1" >trailer.tmp && + cat trailer.tmp >>"$1" && + rm -f trailer.tmp +} + +# Remove any existing packs to make sure that +# whatever we index next will be the pack that we +# actually use. +clear_packs () { + rm -f .git/objects/pack/* +} + +test_oid_cache <<-EOF +packlib_7_0 sha1:01d7713666f4de822776c7622c10f1b07de280dc +packlib_7_0 sha256:37c8e2c15bb22b912e59b43fd51a4f7e9465ed0b5084c5a1411d991cbe630683 + +packlib_7_76 sha1:e68fe8129b546b101aee9510c5328e7f21ca1d18 +packlib_7_76 sha256:5d8e6fc40f2dab00e6983a48523fe57e621f46434cb58dbd4422fba03380d886 +EOF |