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@@ -350,7 +350,7 @@ GRUB_DIR="$BOOT_DIR/grub"
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ISOLINUX_CFG="$ISOLINUX_DIR/isolinux.cfg"
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CURRENT_STEP=0
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STEP_COUNT=9
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-[ -n "${INCLUDE_DIRECTORY}" ] && ((STEP_COUNT=STEP_COUNT+1))
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+[ -n "${INCLUDE_DIRECTORY}" ] && STEP_COUNT=$((STEP_COUNT+1))
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: ${SYSLINUX_DATADIR:="$VOIDHOSTDIR"/usr/lib/syslinux}
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: ${GRUB_DATADIR:="$VOIDHOSTDIR"/usr/share/grub}
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human