114 lines
2.7 KiB
Bash
Executable File
114 lines
2.7 KiB
Bash
Executable File
#!/usr/bin/env bash
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# 2018 Luke Shumaker
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declare -r NAME=osi-mount
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declare -r VERSION=20180812
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set -euE
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source "${BASH_SOURCE[0]%/*}/lib/osi.sh"
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main() {
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needs_root
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local arg_mode=outside
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local arg_user=
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local args
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if ! args="$(getopt -n "${0##*/}" -o hV -l inside:,user,root,help,version -- "$@")"; then
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arg_mode=error
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else
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eval "args=($args)"
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set -- "${args[@]}"
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while true; do
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case "$1" in
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--inside) shift; arg_mode=$1; shift;;
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--user|--root)
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if [[ -n $arg_user ]]; then
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error 0 "Multiple --user/--root flags given"
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arg_mode=error
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fi
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arg_user=${1#--}
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shift
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;;
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-V|--version) shift; arg_mode=version;;
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-h|--help) shift; arg_mode=usage;;
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--) shift; break;;
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*) error 1 'Internal error. The programmer writing this tool screwed up.';;
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esac
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done
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case "$arg_mode" in
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outside)
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case "$#" in
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0) error 0 "Must specify an image, mountpoint, and a command"; arg_mode=error;;
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1) error 0 "Must specify a mountpoint and a command"; arg_mode=error;;
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2) error 0 "Must specify a command"; arg_mode=error;;
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esac
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if [[ -z $arg_user ]]; then
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error 0 "Must specify either --root or --user"
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arg_mode=error
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fi
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;;
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esac
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fi
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arg_device=$1
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arg_mountpoint=$2
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arg_cmd=("${@:3}")
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case "$arg_mode" in
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error) print "Try '%q --help' for more information" "${0##*/}" >&2; return 2;;
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version)
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print "%s (notsystemd) %s" "$NAME" "$VERSION"
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return 0
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;;
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usage)
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print 'Usage: %s [OPTIONS] --<user|root> FILENAME.img COMMAND...' "${0##*/}"
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print 'Operating System Image: Mount'
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echo
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print 'OPTIONS:'
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# --inside is internal-only; undocumented
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print ' --user mount the image RO, run COMMAND as SUDO_USER'
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print ' --root mount the image RW, run COMMAND as root, protect the rest of the system'
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echo
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print ' -h, --help display this help'
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print ' -V, --version output version information'
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return 0
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;;
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outside)
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unshare --mount "${BASH_SOURCE[0]}" --inside="$arg_user" "${args[@]}"
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;;
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user)
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needs_sudo
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mount --make-rslave /
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cmd=(mount -o ro -- "$arg_device" "$arg_mountpoint")
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r=0
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out=$("${cmd[@]}" 2>&1) || r=$?
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if (( r != 0)); then
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error $r '%s: %s' "${cmd[*]@Q}" "$out"
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fi
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trap "umount -- ${arg_mountpoint@Q}" EXIT
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sudo -u "#${SUDO_UID}" -- "${arg_cmd[@]}"
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;;
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root)
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needs_root
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mount --make-rslave /
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# TODO: make the rest of the system RO
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cmd=(mount -o rw -- "$arg_device" "$arg_mountpoint")
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r=0
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out=$("${cmd[@]}" 2>&1) || r=$?
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if (( r != 0)); then
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error $r '%s: %s' "${cmd[*]@Q}" "$out"
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fi
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trap "umount -- ${arg_mountpoint@Q}" EXIT
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command -- "${arg_cmd[@]}"
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;;
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*) error 1 'Internal error. The programmer writing this tool screwed up.';;
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esac
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}
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main "$@"
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