Release oans v1.5.0 · martinus/oans

Reaches files that were previously skipped, fixes two crashes, and puts the
whole codebase under ASAN, UBSAN and ThreadSanitizer in CI.

Features

Hash and deduplicate files whose absolute path exceeds PATH_MAX (#124,
closes #117). Previously these were skipped with a warning. The kernel rejects
any single pathname argument over 4096 bytes, so the new src/longpath.c
reaches them by opening a reachable ancestor and openat-walking the rest,
advancing by the longest run of components that fits one syscall argument — a
4620-byte path costs 5 opens instead of 22. In-range paths take the plain
open()/opendir()/stat() fast path internally, so the hot path is
unchanged. No hashfile schema change and no DB_FILE_MINOR bump.
Hashing throughput during the scanning phase (#120). The progress display
now shows live MB/s while hashing, not just during dedupe.

Fixed a use-after-free in partial mode (#128, fixes #123) that caused
intermittent crashes, plus three remaining PATH_MAX assumptions.
Fixed a use-after-free found by ThreadSanitizer (#129).
The version object now rebuilds when git describe changes (#122), so a
binary can no longer report a stale version string.

CI gained clang ASAN and UBSAN legs running both test suites (#125), and
now fails on warnings with stricter flags plus dependabot (#127).
ThreadSanitizer is usable against GLib (#129), with a suppression that
matches current distros (#131).
CI runs once per commit instead of twice (#130), and make check-all
runs every CI leg in one command (#132).

All of this runs against a real btrfs and XFS scratch filesystem.

scripts/bench-dedupe.py (#121), a reproducible larger-than-RAM dedupe
benchmark harness; methodology is documented in docs/benchmarks.md.

Deduplication goes through the kernel's FIDEDUPERANGE ioctl, which
byte-compares every range before sharing it.