18 lines
334 B
Bash
Executable File
18 lines
334 B
Bash
Executable File
#!/bin/bash
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# returns an unused nbd device
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for sys_path in /sys/block/nbd[0-9]*; do
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[ -d "$sys_path" ] || continue
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if [ -f "$sys_path/size" ] && [ "$(< "$sys_path/size")" -eq 0 ] ; then
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TARGET="/dev/${sys_path##*/}"
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break
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fi
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done
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if [ -z "$TARGET" ]; then
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echo "Error: no free NBD device found" >&2
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exit 1
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fi
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echo $TARGET
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