fix(update): check dir writability to avoid ETXTBSY on running binary#46
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Problem
canWriteExectried to open the running binary withO_WRONLY, which always fails on Linux withETXTBSY(text file busy), causinghctf updateto unnecessarily escalate tosudoeven when the user owns the binary.Fix
Probe writability by creating a temp file in the same directory instead, then immediately removing it. This correctly reflects whether the user can write to that location without touching the binary itself.