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feat(vm_image_util): Add /usr/.noupdate flag file in PXE images.

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This can be used by update_engine as a quick test to determine if it is
running on a system that it can handle. This avoids needing something
like the 'coreos.diskless' kernel command line flag.
This commit is contained in:
Michael Marineau 2014-03-27 15:41:41 -07:00
parent 7b6e547751
commit a6328f7c2b
1 changed files with 7 additions and 1 deletions
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8
build_library/vm_image_util.sh
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@ -301,6 +301,9 @@ _write_cpio_disk() {
${squashfs} /sysroot squashfs x-initrd.mount 0 0
tmpfs /sysroot/usr/share/oem tmpfs size=0,mode=755,x-initrd.mount 0 0
EOF
# Inject /usr/.noupdate into squashfs to disable update_engine
echo "/usr/.noupdate f 444 root root echo -n" >"${VM_TMP_DIR}/extra"
else
# Set tmpfs as default root, squashfs as default /usr
sudo_clobber "${cpio_target}/etc/fstab" <<EOF
@ -320,11 +323,14 @@ users:
passwd: $(</etc/shared_user_passwd.txt)
EOF
fi
# Inject /usr/.noupdate into squashfs to disable update_engine
echo "/.noupdate f 444 root root echo -n" >"${VM_TMP_DIR}/extra"
fi
# Build the squashfs, embed squashfs into a gzipped cpio
pushd "${cpio_target}" >/dev/null
sudo mksquashfs "${base_dir}" "./${squashfs}"
sudo mksquashfs "${base_dir}" "./${squashfs}" -pf "${VM_TMP_DIR}/extra"
find . | cpio -o -H newc | gzip > "$2"
popd >/dev/null