107 lines
3.0 KiB
Bash
107 lines
3.0 KiB
Bash
#!/usr/bin/env bash
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# used to work around cases where stdin is unavailable or not a terminal
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if bash -c ': > /dev/tty' > /dev/null 2>&1; then
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TTY_OR_CONSOLE="/dev/tty"
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else
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TTY_OR_CONSOLE="/dev/console"
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fi
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function echo_tty {
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if [ "$1" = "-n" ]; then
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shift
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echo -n "$@" > $TTY_OR_CONSOLE
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else
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echo "$@" > $TTY_OR_CONSOLE
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fi
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}
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function yesno {
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unset DISCARD_ME
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while [ -z "$DISCARD_ME" ]; do
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read -p "[y/n] " -n1 DISCARD_ME < $TTY_OR_CONSOLE > $TTY_OR_CONSOLE
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case "$DISCARD_ME" in
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y)
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echo_tty
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return 0
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;;
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n)
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echo_tty
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return 1
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;;
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*)
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echo_tty " Please enter y for yes or n for no."
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unset DISCARD_ME
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;;
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esac
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done
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}
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#TODO: refuse to run if system is running
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if [ "$1" = "--yes" ]; then
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DONT_ASK="true"
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else
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DONT_ASK="false"
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echo_tty "Create a new system image?"
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echo_tty
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echo_tty "This will replace the existing system image with a snapshot of the currently"
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echo_tty "running system. Choosing no here will discard any newly installed programs,"
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echo_tty "updates, system configuration changes, etc."
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echo_tty
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echo_tty "This should not affect your files in /home as they are stored to disk directly."
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echo_tty "Check /TODO/README.txt for more information."
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echo_tty
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echo_tty "Creating a new system image will take some time."
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echo_tty
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fi
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#TODO: colors (bright white / light gray for readability)
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if $DONT_ASK || yesno; then
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echo_tty -n "Generating exclusion list... "
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# cutting off the leading slash allows us to just ignore empty lines below
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readarray -t MOUNT_LIST <<< "$(findmnt --output TARGET --noheadings --raw | sed -e 's|^/||' | sort)"
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# always ignore /tmp and the package cache
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EXCLUDE_LIST=("tmp" "var/cache/xbps")
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for I in ${!MOUNT_LIST[@]}; do
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if [ ! -z "${MOUNT_LIST[$I]}" ]; then
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FOUND=0
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for J in ${!EXCLUDE_LIST[@]}; do
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if grep "${EXCLUDE_LIST[$J]}" > /dev/null <<< "${MOUNT_LIST[$I]}"; then
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FOUND=1
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break
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fi
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done
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# if no parent dir of ${MOUNT_LIST[$I]} is found in $EXCLUDE_LIST
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if [ $FOUND -eq 0 ]; then
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EXCLUDE_LIST+=("${MOUNT_LIST[$I]}")
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fi
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fi
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done
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touch /run/void-usb/system-image-excludes
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touch /run/void-usb/system-image-pseudo
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for I in ${!EXCLUDE_LIST[@]}; do
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echo "/${EXCLUDE_LIST[$I]}" >> /run/void-usb/system-image-excludes
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FILE_PERMS="$(stat -c '%a %u %g' "${EXCLUDE_LIST[$I]}")"
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echo "\"/${EXCLUDE_LIST[$I]}\" d $FILE_PERMS" >> /run/void-usb/system-image-pseudo
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done
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echo_tty "done"
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echo_tty "Building image..."
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mksquashfs / /run/void-usb/container/new_squashfs.img -b 1M -comp xz -progress -noappend -pf /run/void-usb/system-image-pseudo -ef /run/void-usb/system-image-excludes > $TTY_OR_CONSOLE
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echo_tty -n "Moving new image in place... "
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mv /run/void-usb/container/new_squashfs.img /run/void-usb/container/squashfs.img
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echo_tty "done"
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else
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echo_tty "Discarding system changes."
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fi
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echo_tty -n "Syncing... "
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sync
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echo_tty "done"
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