root / snf-image-host / snf-image-update-helper.in @ ff7783b8
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#!/bin/bash |
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|
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set -e |
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set -o pipefail |
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|
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. @osdir@/common.sh |
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|
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if [ ! -e "$HELPER_PKG" ]; then |
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log_error "Helper package \`$HELPER_PKG' not found." |
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log_error "You need to provide this for the script to work." |
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exit 1 |
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fi |
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|
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cat >&1 <<EOF |
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This program will overwrite the following files: |
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\`$HELPER_DIR/initrd' |
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\`$HELPER_DIR/kernel' |
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\`$HELPER_DIR/image' |
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EOF |
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|
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while [[ 1 ]]; do |
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echo -n "Do you want to continue [y/N]? " |
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read answer |
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[ "$(echo -n "$answer" | tr [A-Z] [a-z])" = "y" ] && break |
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if [ -z "$answer" -o "$(echo -n "$answer" | tr [A-Z] [a-z])" = "n" ]; then |
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log_error "Abort." |
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exit 1 |
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fi |
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done |
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|
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rm -f "$HELPER_DIR/initrd" "$HELPER_DIR/kernel" "$HELPER_DIR/image" |
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|
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echo -n "Allocating space for helper disk image..." |
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helper_img=$(mktemp "$HELPER_DIR/image.XXXXXX") |
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dd if=/dev/zero of="$helper_img" bs=1k count=400000 &> /dev/null |
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echo "done" |
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echo "Creating partitions..." |
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blockdev=$("$LOSETUP" -sf $helper_img) |
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add_cleanup "$LOSETUP" -d "$blockdev" |
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|
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sleep 1 # sometimes losetup returns and the device is still busy.. |
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|
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format_disk0 "$blockdev" "extdump" 2>&1 | sed -e 's/^/CFDISK: /g' |
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|
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root_dev=$(map_disk0 "$blockdev")-1 |
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add_cleanup unmap_disk0 "$blockdev" |
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|
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echo Creating and configuring filesystem... |
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mkfs.ext3 "$root_dev" 2>&1 | sed -e 's/^/MKFS.EXT3: /g' |
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# The helper vm should never do filesystem checks... |
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tune2fs -i 0 -c 0 "$root_dev" 2>&1 | sed -e 's/^/TUNE2FS: /g' |
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|
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target=$(mktemp -d) |
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add_cleanup rmdir "$target" |
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|
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mount "$root_dev" "$target" |
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add_cleanup umount "$root_dev" |
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|
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echo -n "Checking for cached root filesystem file \`$HELPER_CACHE_FILE'..." |
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if [ -f "$HELPER_CACHE_FILE" ]; then |
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echo "found" |
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tar xf "$HELPER_CACHE_FILE" -C "$target" |
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else |
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echo "not found" |
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echo "Debootstraping to create a new root filesystem:" |
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debootstrap --arch amd64 --include "$HELPER_EXTRA_PKGS" \ |
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--variant=minbase stable "$target" 2>&1 | sed -e 's/^/DEBOOTSTRAP: /g' |
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|
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# remove the downloaded debs, as they are no longer needed |
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find "$target/var/cache/apt/archives" -type f -name '*.deb' -print0 | \ |
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xargs -r0 rm -f |
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|
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tmp_cache=$(mktemp "$HELPER_CACHE_FILE.XXXXXX") |
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tar cf "$tmp_cache" -C "$target" . || { rm "$tmp_cache"; false; } |
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mv -f "$tmp_cache" "$HELPER_CACHE_FILE" |
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fi |
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|
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echo -n "Configuring the helper image..." |
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echo snf-image-helper > "$target/etc/hostname" |
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|
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cat > "$target/etc/fstab" <<EOF |
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# /etc/fstab: static file system information. |
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# |
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# <file system> <mount point> <type> <options> <dump> <pass> |
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/dev/sda1 / ext3 defaults 0 1 |
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proc /proc proc defaults 0 0 |
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EOF |
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echo "done" |
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|
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echo -n "Extracting kernel..." |
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if [ ! -L "$target/vmlinuz" -o ! -L "$target/vmlinuz" ]; then |
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echo -e "\033[1;31mfailed\033[0m" |
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log_error "vmlinuz or initrd.img link in root is missing." |
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log_error "I don't know how to find a usable kernel/initrd pair." |
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exit 1 |
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fi |
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echo "done" |
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|
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kernel=$(readlink -en "$target/vmlinuz") |
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initrd=$(readlink -en "$target/initrd.img") |
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|
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echo "Moving $(basename "$kernel") and $(basename "$initrd") to \`$HELPER_DIR'" |
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mv "$kernel" "$initrd" "$HELPER_DIR" |
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|
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kernel=$(basename "$kernel") |
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initrd=$(basename "$initrd") |
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|
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(cd "$HELPER_DIR"; ln -fs "$kernel" kernel; ln -fs "$initrd" initrd) |
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|
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rm "$target/vmlinuz" "$target/initrd.img" |
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|
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echo "Installing snf-image-helper pkg in the new image..." |
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cp "$HELPER_PKG" "$target/tmp/" |
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pkg_name=$(basename "$HELPER_PKG") |
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add_cleanup rm "$target/tmp/$pkg_name" |
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chroot "$target" dpkg -i "/tmp/$pkg_name" 2>&1 | sed -e 's/^/DPKG: /g' |
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cat > "$target/etc/rc.local" <<EOF |
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#!/bin/sh -e |
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# |
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# rc.local |
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# |
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# This script is executed at the end of each multiuser runlevel. |
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# Make sure that the script will "exit 0" on success or any other |
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# value on error. |
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# |
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# In order to enable or disable this script just change the execution |
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# bits. |
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# |
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# By default this script does nothing. |
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|
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if ! grep -q snf_image_activate_helper /proc/cmdline; then |
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echo "WARNING: NOT calling snf-image-helper, add snf_image_activate_helper" |
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echo "to the kernel command line if you want to do so." |
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else |
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/usr/bin/snf-image-helper --force |
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fi |
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|
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exit 0 |
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EOF |
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chmod +x "$target/etc/rc.local" |
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echo "done" |
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|
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cleanup |
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|
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mv "$helper_img" "$HELPER_DIR/image" |
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|
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trap - EXIT |
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|
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echo "Files in \`$HELPER_DIR' were updated successfully" |
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exit 0 |
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# vim: set sta sts=4 shiftwidth=4 sw=4 et ai : |