Move fuzzing corpus generation to xtask

Signed-off-by: Andrew Gunnerson <accounts+github@chiller3.com>

fuzz/README.md

@@ -13,7 +13,7 @@ While avbroot's parsers are all memory-safe, it is still possible for panics or
 2. [Optional] Generate sample files to use as the initial fuzzing corpus.
 
     ```bash
-    ./corpus/build.sh
+    cargo xtask fuzz-corpus
     ```
 
 3. Pick a fuzz target to run. A fuzz target is the name of the source file in [`src/bin/`](./src/bin) without the `.rs` extension.

fuzz/corpus/build.sh

@@ -1,70 +0,0 @@
-#!/bin/bash
-
-set -eu
-
-cd "$(dirname "${BASH_SOURCE[0]}")"
-
-pushd ../.. >/dev/null
-cargo build
-popd >/dev/null
-
-avbroot=$(pwd)/../../target/debug/avbroot
-
-generate_corpus() {
-    local generator=${1}
-    local corpus_dir=${2}
-    local suffix=${3}
-
-    for dir in "${corpus_dir}"/*/; do
-        output=${dir%/}${suffix}
-        output=../hfuzz_workspace/${output/\//\/input\/}
-        abs_output=$(pwd)/${output}
-
-        echo "# ${dir} -> ${output}"
-
-        mkdir -p "${abs_output%/*}"
-
-        pushd "${dir}" >/dev/null
-        "${generator}" "${abs_output}"
-        popd >/dev/null
-
-        echo
-    done
-}
-
-generate_avb_image() {
-    "${avbroot}" avb pack -q -o "${1}"
-}
-
-generate_boot_image() {
-    if [[ -d vts_signature ]]; then
-        pushd vts_signature >/dev/null
-        "${avbroot}" avb pack -q -o ../vts_signature.img
-        popd >/dev/null
-    fi
-
-    "${avbroot}" boot pack -q -o "${1}"
-}
-
-generate_cpio_image() {
-    "${avbroot}" cpio pack -q -o "${1}"
-}
-
-generate_fec_image() {
-    "${avbroot}" fec generate -i input.img -f "${1}"
-}
-
-generate_lp_image() {
-    "${avbroot}" lp pack -q -o "${1}"
-}
-
-generate_sparse_image() {
-    "${avbroot}" sparse pack -q -i input.img -o "${1}"
-}
-
-generate_corpus generate_avb_image avb .img
-generate_corpus generate_boot_image bootimage .img
-generate_corpus generate_cpio_image cpio .cpio
-generate_corpus generate_fec_image fec .fec
-generate_corpus generate_lp_image lp .img
-generate_corpus generate_sparse_image sparse .img