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jbanety/create_bootable_sierra_usb_stick.sh

Created June 24, 2020 08:04
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Create a Sierra bootable USB Stick without createinstallmedia
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create_bootable_sierra_usb_stick.sh
#/bin/bash
VOLUME_NAME=CLEF
DMG_PATH=/Applications/Install\ macOS\ Sierra.app/Contents/SharedSupport/InstallESD.dmg
hdiutil attach ${DMG_PATH} -noverify -nobrowse -mountpoint /Volumes/install_app
hdiutil convert /Volumes/install_app/BaseSystem.dmg -format UDSP -o /tmp/Sierra
hdiutil resize -size 8g /tmp/Sierra.sparseimage
hdiutil attach /tmp/Sierra.sparseimage -noverify -nobrowse -mountpoint /Volumes/install_build
rm /Volumes/install_build/System/Installation/Packages
cp -rp /Volumes/install_app/Packages /Volumes/install_build/System/Installation/
cp /Volumes/install_app/BaseSystem.chunklist /Volumes/install_build
cp /Volumes/install_app/BaseSystem.dmg /Volumes/install_build
hdiutil detach /Volumes/install_app
hdiutil detach /Volumes/install_build
hdiutil resize -size `hdiutil resize -limits /tmp/Sierra.sparseimage | tail -n 1 | awk '{ print $1 }'`b /tmp/Sierra.sparseimage
hdiutil convert /tmp/Sierra.sparseimage -format UDZO -o /tmp/Sierra
rm /tmp/Sierra.sparseimage
mv /tmp/Sierra.dmg ~/Desktop
sudo asr restore --source ~/Desktop/Sierra.dmg --target /Volumes/${VOLUME_NAME} --noprompt --noverify --erase
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