Docker always creates a fresh tmpfs at /dev, silently dropping any
/dev:/dev bind mount. Block devices must be accessed via /host-dev
where the host /dev is actually mounted.
Changes:
- docker-compose.yml: /dev:/dev → /dev:/host-dev:rw
- safety.go: add HostDevPath constant + HostDevicePath() helper
- format_linux.go: all device ops (stat, sfdisk, partprobe, mkfs.ext4,
blkid) use HostDevicePath() to resolve /dev/sdb → /host-dev/sdb
- safety_linux.go: IsSystemDisk() stats device via /host-dev
- scan_linux.go: enrichWithBlkid() probes each partition individually
via /host-dev/sdXN instead of batch blkid -o export (which can't
find devices when /dev is Docker's minimal tmpfs)
Fixes "stat /dev/sdb: no such file or directory" in FormatAndMount.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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