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|
#!/bin/sh
# bisect through the database dumps to see when a specific thing
# appeared first
dumps=$(
find '/data/backup' -mindepth 1 -maxdepth 1 -name 'database-*.xz' -exec ls -tr {} +
)
has=$(
printf '%s\n' "$dumps" | \
tail -n1
)
if ! xzgrep -q "$@" "${has}"; then
>&2 printf 'cannot find "%s" in the latest dump - swapping directions\n' "$*"
dumps=$(
printf '%s\n' "${dumps}" | \
tac
)
has=$(
printf '%s\n' "$dumps" | \
tail -n1
)
if ! xzgrep -q "$@" "${has}"; then
>&2 printf 'cannot find "%s" in the earliest dump either - swapping directions did not help\n' "$*"
exit 1
fi
fi
has_not=$(
printf '%s\n' "$dumps" | \
head -n1
)
if xzgrep -q "$@" "${has_not}"; then
>&2 printf 'first dump does also have "%s"\n' "$*"
exit 1
fi
count=$(
printf '%s\n' "${dumps}" | \
wc -l
)
>&2 printf '%s dumps to check\n' "${count}"
while [ "${count}" -gt 2 ]; do
pivot=$(
printf '%s\n' "${dumps}" | \
sed -n '
\@^'"${has_not}"'$@,\@^'"${has}"'$@p
' | \
sed -n '
'"$((count/2+1))"' p
'
)
>&2 printf 'looking into "%s" ... ' "${pivot}"
if xzgrep -q "$@" "${pivot}"; then
>&2 printf 'has'
has="${pivot}"
else
>&2 printf 'has not'
has_not="${pivot}"
fi
count=$(
printf '%s\n' "${dumps}" | \
sed -n '
\@^'"${has_not}"'$@,\@^'"${has}"'$@p
' | \
wc -l
)
>&2 printf ' (%s dumps remaining)\n' "${count}"
done
printf '%s has not\n%s has\n' "${has_not}" "${has}"
|
