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128 lines
2.4 KiB
Bash
128 lines
2.4 KiB
Bash
#!/bin/bash
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mount_count=128
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function print_usage()
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{
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if [ -n "$2" ]; then
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echo "Error: $2"
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echo
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fi
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echo "Usage: $1 <scratch dir> [seed]"
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echo "(If no seed is given, it will be randomly generated.)"
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}
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scratch_dir=$1
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if [ -z "$scratch_dir" ]; then
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print_usage "$0" 'No scratch dir given' >&2
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exit 1
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fi
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if [ ! -d "$scratch_dir" ]; then
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print_usage "$0" "$scratch_dir is not a directory" >&2
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exit 1
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fi
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seed=$2
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if [ -z "$seed" ]; then
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seed=$RANDOM
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fi
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RANDOM=$seed
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echo "Seed: $seed"
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set -e
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shopt -s nullglob
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cd "$scratch_dir"
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if [ -d share ]; then
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echo 'Error: This directory seems to be in use already' >&2
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exit 1
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fi
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for ((i = 0; i < $mount_count; i++)); do
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printf "Setting up fs %i/%i...\r" "$((i + 1))" "$mount_count"
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rm -f fs$i.img
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truncate -s 512M fs$i.img
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mkfs.xfs -q fs$i.img
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devs[i]=$(sudo losetup -f --show fs$i.img)
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done
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echo
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top_level_mounts=$((RANDOM % mount_count + 1))
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mkdir -p share
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echo 'root' > share/some-file
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for ((i = 0; i < $top_level_mounts; i++)); do
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printf "Mounting fs %i/%i...\r" "$((i + 1))" "$mount_count"
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mkdir -p share/mnt$i
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touch share/mnt$i/not-mounted
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sudo mount "${devs[i]}" share/mnt$i
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sudo chown "$(id -u):$(id -g)" share/mnt$i
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pushd share/mnt$i >/dev/null
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path=mnt$i
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nesting=$((RANDOM % 4))
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for ((j = 0; j < $nesting; j++)); do
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cat > some-file <<EOF
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$i
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$path
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EOF
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mkdir sub
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cd sub
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path="$path/sub"
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done
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cat > some-file <<EOF
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$i
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$path
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EOF
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popd >/dev/null
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done
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for ((; i < $mount_count; i++)); do
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printf "Mounting fs %i/%i...\r" "$((i + 1))" "$mount_count"
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mp_i=$((i % top_level_mounts))
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pushd share/mnt$mp_i >/dev/null
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path=mnt$mp_i
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while true; do
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sub_mp="$(echo mnt*)"
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if cd sub 2>/dev/null; then
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path="$path/sub"
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elif [ -n "$sub_mp" ] && cd "$sub_mp" 2>/dev/null; then
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path="$path/$sub_mp"
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else
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break
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fi
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done
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mkdir mnt$i
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touch mnt$i/not-mounted
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sudo mount "${devs[i]}" mnt$i
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sudo chown "$(id -u):$(id -g)" mnt$i
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cd mnt$i
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path="$path/mnt$i"
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nesting=$((RANDOM % 4))
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for ((j = 0; j < $nesting; j++)); do
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cat > some-file <<EOF
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$i
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$path
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EOF
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mkdir sub
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cd sub
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path="$path/sub"
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done
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cat > some-file <<EOF
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$i
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$path
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EOF
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popd >/dev/null
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done
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echo
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echo 'Done.'
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