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[经验] 模拟显示 grub 启动菜单

2022-05-02 分类：bbs

本帖最后由 zxxx 于 2022-5-2 22:38 编辑

[经验] 模拟显示 grub 启动菜单

来源：https://askubuntu.com/questions/1019213/display-grub-menu-and-options-without-rebooting

grub-menu.sh – bash script

  1. #!/bin/bash
  3. # NAME: grub-menu.sh
  4. # PATH: $HOME/bin
  5. # DESC: Written for AU Q&A: https://askubuntu.com/q/1019213/307523
  6. # DATE: Apr 5, 2018. Modified: May 7, 2018.
  8. # $TERM variable may be missing when called via desktop shortcut
  9. CurrentTERM=$(env | grep TERM)
  10. if [[ $CurrentTERM == "" ]] ; then
  11.     notify-send –urgency=critical "$0 cannot be run from GUI without TERM environment variable."
  12.     exit 1
  13. fi
  15. AllMenusArr=()      # All menu options.
  16. # Default for hide duplicate and triplicate options with (upstart) and (recovery mode)?
  17. HideUpstartRecovery=false
  18. if [[ $1 == short ]] ; then
  19.     HideUpstartRecovery=true    # override default with first passed parameter "short"
  20. elif [[ $1 == long ]] ; then
  21.     HideUpstartRecovery=false   # override default with first passed parameter "long"
  22. fi
  23. SkippedMenuEntry=false  # Don’t change this value, automatically maintained
  24. InSubMenu=false     # Within a line beginning with `submenu`?
  25. InMenuEntry=false   # Within a line beginning with `menuentry` and ending in `{`?
  26. NextMenuEntryNo=0   # Next grub internal menu entry number to assign
  27. # Major / Minor internal grub submenu numbers, ie `1>0`, `1>1`, `1>2`, etc.
  28. ThisSubMenuMajorNo=0
  29. NextSubMenuMinorNo=0
  30. CurrTag=""          # Current grub internal menu number, zero based
  31. CurrText=""         # Current grub menu option text, ie "Ubuntu", "Windows…", etc.
  32. SubMenuList=""      # Only supports 10 submenus! Numbered 0 to 9. Future use.
  34. while read -r line; do
  35.     # Example: "           }"
  36.     BlackLine="${line//[[:blank:]]/}" # Remove all whitespace
  37.     if [[ $BlackLine == "}" ]] ; then
  38.         # Add menu option in buffer
  39.         if [[ $SkippedMenuEntry == true ]] ; then
  40.             NextSubMenuMinorNo=$(( $NextSubMenuMinorNo + 1 ))
  41.             SkippedMenuEntry=false
  42.             continue
  43.         fi
  44.         if [[ $InMenuEntry == true ]] ; then
  45.             InMenuEntry=false
  46.             if [[ $InSubMenu == true ]] ; then
  47.                 NextSubMenuMinorNo=$(( $NextSubMenuMinorNo + 1 ))
  48.             else
  49.                 NextMenuEntryNo=$(( $NextMenuEntryNo + 1 ))
  50.             fi
  51.         elif [[ $InSubMenu == true ]] ; then
  52.             InSubMenu=false
  53.             NextMenuEntryNo=$(( $NextMenuEntryNo + 1 ))
  54.         else
  55.             continue # Future error message?
  56.         fi
  57.         # Set maximum CurrText size to 68 characters.
  58.         CurrText="${CurrText:0:67}"
  59.         AllMenusArr+=($CurrTag "$CurrText")
  60.     fi
  62.     # Example: "menuentry ‘Ubuntu’ –class ubuntu –class gnu-linux –class gnu" …
  63.     #          "submenu ‘Advanced options for Ubuntu’ $menuentry_id_option" …
  64.     if [[ $line == submenu* ]] ; then
  65.         # line starts with `submenu`
  66.         InSubMenu=true
  67.         ThisSubMenuMajorNo=$NextMenuEntryNo
  68.         NextSubMenuMinorNo=0
  69.         SubMenuList=$SubMenuList$ThisSubMenuMajorNo
  70.         CurrTag=$NextMenuEntryNo
  71.         CurrText="${line#*’}"
  72.         CurrText="${CurrText%%’*}"
  73.         AllMenusArr+=($CurrTag "$CurrText") # ie "1 Advanced options for Ubuntu"
  75.     elif [[ $line == menuentry* ]] && [[ $line == *"{"* ]] ; then
  76.         # line starts with `menuentry` and ends with `{`
  77.         if [[ $HideUpstartRecovery == true ]] ; then
  78.             if [[ $line == *"(upstart)"* ]] || [[ $line == *"(recovery mode)"* ]] ; then
  79.                 SkippedMenuEntry=true
  80.                 continue
  81.             fi
  82.         fi
  83.         InMenuEntry=true
  84.         if [[ $InSubMenu == true ]] ; then
  85.             : # In a submenu, increment minor instead of major which is "sticky" now.
  86.             CurrTag=$ThisSubMenuMajorNo">"$NextSubMenuMinorNo
  87.         else
  88.             CurrTag=$NextMenuEntryNo
  89.         fi
  90.         CurrText="${line#*’}"
  91.         CurrText="${CurrText%%’*}"
  93.     else
  94.         continue    # Other stuff – Ignore it.
  95.     fi
  97. done < /boot/grub/grub.cfg
  99. LongVersion=$(grub-install –version)
  100. ShortVersion=$(echo "${LongVersion:20}")
  101. DefaultItem=0
  103. if [[ $HideUpstartRecovery == true ]] ; then
  104.     MenuText="Menu No.     ———– Menu Name ———–"
  105. else
  106.     MenuText="Menu No. ————— Menu Name —————"
  107. fi
  109. while true ; do
  111.     Choice=$(whiptail
  112.         –title "Use arrow, page, home & end keys. Tab toggle option"
  113.         –backtitle "Grub Version: $ShortVersion"
  114.         –ok-button "Display Grub Boot"
  115.         –cancel-button "Exit"
  116.         –default-item "$DefaultItem"
  117.         –menu "$MenuText" 24 76 16
  118.         "${AllMenusArr[@]}"
  119.         2>&1 >/dev/tty)
  121.     clear
  122.     if [[ $Choice == "" ]]; then break ; fi
  123.     DefaultItem=$Choice
  125.     for (( i=0; i < ${#AllMenusArr[@]}; i=i+2 )) ; do
  126.         if [[ "${AllMenusArr[i]}" == $Choice ]] ; then
  127.             i=$i+1
  128.             MenuEntry="menuentry ‘"${AllMenusArr[i]}"’"
  129.             break
  130.         fi
  131.     done
  133.     TheGameIsAfoot=false
  134.     while read -r line ; do
  135.         if [[ $line = *"$MenuEntry"* ]]; then TheGameIsAfoot=true ; fi
  136.         if [[ $TheGameIsAfoot == true ]]; then
  137.             echo $line
  138.             if [[ $line = *"}"* ]]; then break ; fi
  139.         fi
  140.     done < /boot/grub/grub.cfg
  142.     read -p "Press <Enter> to continue"
  144. done
  146. exit 0

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grub-display.sh – bash script – Ubuntu Desktop

  1. #!/bin/bash
  3. # NAME: grub-display.sh
  4. # PATH: $HOME/bin
  5. # DESC: Written for AU Q&A: https://askubuntu.com/q/1019213/307523
  6. # DATE: Mar 24, 2018. Modified: Mar 26, 2018.
  8. # $TERM variable may be missing when called via desktop shortcut
  9. CurrentTERM=$(env | grep TERM)
  10. if [[ $CurrentTERM == "" ]] ; then
  11.     notify-send –urgency=critical "$0 cannot be run from GUI without TERM environment variable."
  12.     exit 1
  13. fi
  15. # Must have the dialog package. On Servers, not installed by default
  16. command -v dialog >/dev/null 2>&1 || { echo >&2 "dialog package required but it is not installed.  Aborting."; exit 99; }
  18. # Version without upstart and recovery options displayed
  19. #awk -F’ ‘/menuentry / { print i++, $2}’ /boot/grub/grub.cfg
  20. #        | grep -v upstart | grep -v recovery > ~/.grub-display-menu
  22. # Version with upstart and recovery options displayed
  23. awk -F’ ‘/menuentry / { print i++, $2}’ /boot/grub/grub.cfg
  24.         > ~/.grub-display-menu
  26. MenuArr=()
  28. while read -r line; do
  29.     MenuNmbr=${line%% *}
  30.     MenuName=${line#* }
  31.     MenuArr+=($MenuNmbr "$MenuName")
  32. done < ~/.grub-display-menu
  33. rm ~/.grub-display-menu
  35. LongVersion=$(grub-install –version)
  36. ShortVersion=$(echo "${LongVersion:20}")
  37. DefaultItem=0
  39. while true ; do
  41.     Choice=$(dialog
  42.         –title "Use arrow, page, home & end keys. Tab toggle option"
  43.         –backtitle "Grub Version: $ShortVersion"
  44.         –ok-label "Display Grub Boot"
  45.         –cancel-label "Exit"
  46.         –default-item "$DefaultItem"
  47.         –menu "Menu Number       ———– Menu Name ———-" 24 76 16
  48.         "${MenuArr[@]}"
  49.         >/dev/tty)
  51.     clear
  52.     if [[ $Choice == "" ]]; then break ; fi
  53.     DefaultItem=$Choice
  55.     for (( i=0; i < ${#MenuArr[@]}; i=i+2 )) ; do
  56.         if [[ "${MenuArr[i]}" == $Choice ]] ; then
  57.             i=$i+1
  58.             MenuEntry="menuentry ‘"${MenuArr[i]}"’"
  59.             break
  60.         fi
  61.     done
  63.     TheGameIsAfoot=false
  64.     while read -r line ; do
  65.         if [[ $line = *"$MenuEntry"* ]]; then TheGameIsAfoot=true ; fi
  66.         if [[ $TheGameIsAfoot == true ]]; then
  67.             echo $line
  68.             if [[ $line = *"}"* ]]; then break ; fi
  69.         fi
  70.     done < /boot/grub/grub.cfg
  72.     read -p "Press <Enter> to continue"
  74. done
  76. exit 0

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grub-display-lite.sh – bash script – Ubuntu Server

  1. #!/bin/bash
  3. # NAME: grub-display-lite.sh
  4. # PATH: $HOME/bin
  5. # DESC: Written for AU Q&A: https://askubuntu.com/q/1019213/307523
  6. # DATE: Mar 26, 2018.
  7. # NOTE: "lite" version written for Ubuntu Server and Lubuntu which do
  8. #       not have `dialog` installed by default. `whiptail` is used
  9. #       instead. Nice consequences are better resolution, mouse scroll
  10. #       wheel and copy to clipboard support.
  12. # $TERM variable may be missing when called via desktop shortcut
  13. CurrentTERM=$(env | grep TERM)
  14. if [[ $CurrentTERM == "" ]] ; then
  15.     notify-send –urgency=critical "$0 cannot be run from GUI without TERM environment variable."
  16.     exit 1
  17. fi
  19. # Version without upstart and recovery options displayed
  20. awk -F’ ‘/menuentry / { print i++, $2}’ /boot/grub/grub.cfg
  21.         | grep -v upstart | grep -v recovery > ~/.grub-display-menu
  23. # Version with upstart and recovery options displayed
  24. #awk -F’ ‘/menuentry / { print i++, $2}’ /boot/grub/grub.cfg
  25. #        > ~/.grub-display-menu
  27. MenuArr=()
  29. while read -r line; do
  30.     MenuNmbr=${line%% *}
  31.     MenuName=${line#* }
  32.     MenuArr+=($MenuNmbr "$MenuName")
  33. done < ~/.grub-display-menu
  34. rm ~/.grub-display-menu
  36. LongVersion=$(grub-install –version)
  37. ShortVersion=$(echo "${LongVersion:20}")
  38. DefaultItem=0
  40. while true ; do
  42.     Choice=$(whiptail
  43.         –title "Use arrow, page, home & end keys. Tab toggle option"
  44.         –backtitle "Grub Version: $ShortVersion"
  45.         –ok-button "Display Grub Boot"
  46.         –cancel-button "Exit"
  47.         –default-item "$DefaultItem"
  48.         –menu "Menu Number       ———– Menu Name ———-" 24 76 16
  49.         "${MenuArr[@]}"
  50.        >/dev/tty)
  52.     clear
  53.     if [[ $Choice == "" ]]; then break ; fi
  54.     DefaultItem=$Choice
  56.     for (( i=0; i < ${#MenuArr[@]}; i=i+2 )) ; do
  57.         if [[ "${MenuArr[i]}" == $Choice ]] ; then
  58.             i=$i+1
  59.             MenuEntry="menuentry ‘"${MenuArr[i]}"’"
  60.             break
  61.         fi
  62.     done
  64.     TheGameIsAfoot=false
  65.     while read -r line ; do
  66.         if [[ $line = *"$MenuEntry"* ]]; then TheGameIsAfoot=true ; fi
  67.         if [[ $TheGameIsAfoot == true ]]; then
  68.             echo $line
  69.             if [[ $line = *"}"* ]]; then break ; fi
  70.         fi
  71.     done < /boot/grub/grub.cfg
  73.     read -p "Press <Enter> to continue"
  75. done
  77. exit 0

复制代码
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