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git://sourceware.org/git/lvm2.git
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48 lines
1.2 KiB
Bash
48 lines
1.2 KiB
Bash
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# Put lvm-related utilities here.
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# This file is sourced from test-lib.sh.
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export LVM_SUPPRESS_FD_WARNINGS=1
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ME=$(basename "$0")
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warn() { echo >&2 "$ME: $@"; }
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unsafe_losetup_()
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{
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f=$1
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# Prefer the race-free losetup from recent util-linux-ng.
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dev=$(losetup --find --show "$f" 2>/dev/null) \
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&& { echo "$dev"; return 0; }
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# If that fails, try to use util-linux-ng's -f "find-device" option.
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dev=$(losetup -f 2>/dev/null) \
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&& losetup "$dev" "$f" \
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&& { echo "$dev"; return 0; }
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# Last resort: iterate through /dev/loop{,/}{0,1,2,3,4,5,6,7,8,9}
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for slash in '' /; do
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for i in 0 1 2 3 4 5 6 7 8 9; do
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dev=/dev/loop$slash$i
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losetup $dev > /dev/null 2>&1 && continue;
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losetup "$dev" "$f" > /dev/null && { echo "$dev"; return 0; }
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break
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done
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done
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return 1
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}
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loop_setup_()
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{
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file=$1
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dd if=/dev/zero of="$file" bs=1M count=1 seek=1000 > /dev/null 2>&1 \
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|| { warn "loop_setup_ failed: Unable to create tmp file $file"; return 1; }
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# NOTE: this requires a new enough version of losetup
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dev=$(unsafe_losetup_ "$file" 2>/dev/null) \
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|| { warn "loop_setup_ failed: Unable to create loopback device"; return 1; }
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echo "$dev"
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return 0;
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}
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