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38 lines
611 B
38 lines
611 B
#!/bin/sh
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arg0=$(basename "$0")
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fatal() {
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echo "F: $arg0: $@"
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exit 1
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}
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if [ $# -gt 0 -a -d "$1" ]; then
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DIR="$1"
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shift
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else
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DIR="."
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fi
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cd "$DIR" || fatal "$DIR: invalid chroot dir"
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DIR=$(pwd -P)
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error=false
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for x in dev dev/pts proc sys tmp; do
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if ! grep -q " $DIR/$x " /proc/mounts; then
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mount --bind /$x $DIR/$x || error=true
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if $error; then
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[ "$x" != dev ] || fatal "can't do anything"
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break
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fi
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fi
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done
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$error || HOME=/root chroot "$DIR" "$@"
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while grep -q " $DIR/" /proc/mounts; do
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sleep 0.2
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grep " $DIR/" /proc/mounts | cut -d' ' -f2 | tac | xargs -r --verbose -- umount
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done
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