. "$BST_LIB"
require cpio cpio/present

# The shipped /bin/cpio must be GNU cpio: ALTERNATIVE_PRIORITY 100 outranks both
# other claimants, bsdcpio (80) and the busybox applet (50).
check_out cpio/gnu-version "GNU cpio" cpio --version

tmp=${TMPDIR:-/tmp}/bst-cpio.$$
mkdir -p "$tmp/src/sub"
line="the quick brown fox jumps over the lazy dog 0123456789"
i=0
while [ $i -lt 32 ]; do printf "%s\n" "$line"; i=$((i+1)); done > "$tmp/src/a.txt"
printf "nested payload\n" > "$tmp/src/sub/b.txt"

# Copy-out to STDOUT, not a named file: cpio's create mode is stream-oriented by
# design (cpio -o > file, the shell opens the output). This is the SVR4 'newc'
# form initramfs and dpkg drive. (Named-file mode is below.)
check     cpio/copy-out    sh -c "cd '$tmp/src' && find . | cpio -o -H newc > '$tmp/arc.cpio'"
# newc archives begin with the ASCII magic 070701.
check_out cpio/newc-magic  "070701"      sh -c "head -c 6 '$tmp/arc.cpio'"
# list enumerates members from the stream; the nested path proves recursion.
check_out cpio/list        "sub/b.txt"   sh -c "cpio -itv < '$tmp/arc.cpio'"

# Copy-in extract from the stream. The owner restore is skipped
# (--no-preserve-owner) and -m omitted so no mtime restore is attempted; file
# content still round-trips — what dpkg -x / initramfs unpack rely on.
# BRINTOS-WORKAROUND: linux#5 revisit — added because chown/utimes were ENOSYS;
# the syscalls are wired now, but chown is a documented accept-and-succeed no-op
# for uid/gid on virtio-fs, so asserting a restored owner needs judgement rather
# than just dropping the flag.
mkdir -p "$tmp/out"
check     cpio/copy-in     sh -c "cd '$tmp/out' && cpio -id --no-preserve-owner < '$tmp/arc.cpio'"
check     cpio/identical   cmp -s "$tmp/src/a.txt" "$tmp/out/a.txt"

# Copy-pass clones a directory tree file-to-file (no archive), the third stream
# form; same --no-preserve-owner / no-mtime treatment.
mkdir -p "$tmp/clone"
check     cpio/copy-pass   sh -c "cd '$tmp/src' && find . | cpio -pd --no-preserve-owner '$tmp/clone'"
check     cpio/clone-ident cmp -s "$tmp/src/sub/b.txt" "$tmp/clone/sub/b.txt"

# Named-file create (cpio -O FILE) — the form that reaches creat(2), where the
# stream form above does not. Read the archive back rather than trusting rc=0.
check     cpio/named-create sh -c "cd '$tmp/src' && find . | cpio -o -H newc -O '$tmp/named.cpio'"
check_out cpio/named-magic  "070701"      sh -c "head -c 6 '$tmp/named.cpio'"
check_out cpio/named-list   "sub/b.txt"   sh -c "cpio -itv < '$tmp/named.cpio'"

rm -rf "$tmp"