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ncp-update: implement step based upgrade
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| #!/bin/bash | ||
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| # Backward updates mechanism | ||
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| set -e | ||
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| source /usr/local/etc/library.sh | ||
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| # Updates folder contains the "history" of updates | ||
| updates="$1" | ||
| [ -d "$updates" ] || { echo "$updates does not exist. Abort" >&2; exit 1; } | ||
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| # Get the array of updates dir | ||
| # The files in updates dir are sorted by tag number | ||
| # Files names follow the syntax of a tag: x.y.z.sh | ||
| while read line ; do | ||
| updates_list+=("$line") | ||
| done < <( ls -1 "$updates" | sort -V) | ||
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| starting_checkpoint=0 | ||
| len=${#updates_list[@]} | ||
| end_of_list=$((len - 1)) | ||
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| # The latest checkpoint is the newer version in updates dir | ||
| latest_checkpoint=${updates_list[$end_of_list]} | ||
| latest_checkpoint_version=$( basename "$latest_checkpoint" .sh ) | ||
| current_version=$( grep -oP "\d+\.\d+\.\d+" /usr/local/etc/ncp-version | cut -d'v' -f1 ) | ||
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| # Compare current version with latest checkpoint | ||
| # If the current version is more recent than the latest checkpoint there is no need for backward updates | ||
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| if is_more_recent_than "$latest_checkpoint_version" "$current_version" ; then | ||
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| # Execute a series of updates of older versions | ||
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| # Binary search to find the right checkpoint to begin the updates | ||
| # Checkpoints are considered the updates files | ||
| # An update file will update the system to the version it has as a tag | ||
| # <tag>.sh will update ncp to <tag> version | ||
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| # An update is *applicable* when it is more recent than the current version | ||
| # An older update/checkpoint is not *applicable* to our system | ||
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| lower_bound=0 | ||
| upper_bound=$end_of_list | ||
| while [ $lower_bound -le $upper_bound ]; do | ||
| x=$((upper_bound + lower_bound)) | ||
| mid=$((x / 2)) | ||
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| #Compare mid's version with current version | ||
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| mid_version=$( basename ${updates_list[$mid]} .sh ) | ||
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| if is_more_recent_than "$mid_version" "$current_version" ; then | ||
| # Mid's version update is applicable to the current version | ||
| # Check if the previous checkpoint (mid-1) is applicable | ||
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| previous=$((mid - 1)) | ||
| previous_version=$( basename ${updates_list[$previous]} .sh ) | ||
| if [ "$mid" -gt 0 ] ; then | ||
| #Compare previous's version with current version | ||
| # If the previous checkpoint is not applicable then mid is the starting checkpoint | ||
| # Otherwise keep on binary searching | ||
| if is_more_recent_than "$current_version" "$previous_version" ; then | ||
| starting_checkpoint=$mid | ||
| break | ||
| fi | ||
| else | ||
| # mid is at 0, so this is the starting checkpoint | ||
| starting_checkpoint=$mid | ||
| break | ||
| fi | ||
| # Continue searching for starting checkpoint | ||
| upper_bound=$((mid - 1)) | ||
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| else | ||
| # Mid's version update is not applicable to the current version | ||
| # Check if the next checkpoint (mid+1) is applicable | ||
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| next=$((mid + 1)) | ||
| next_version=$( basename ${updates_list[$next]} .sh ) | ||
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| #Compare next's version with current version | ||
| # If next checkpoint is not applicable then next is the starting checkpoint | ||
| # Otherwise keep on binary searching | ||
| if is_more_recent_than "$current_version" "$next_version" ; then | ||
| # Continue searching for starting checkpoint | ||
| lower_bound=$((mid + 1)) | ||
| else | ||
| # The next version is the starting checkpoint | ||
| starting_checkpoint=$next | ||
| break | ||
| fi | ||
| fi | ||
| done | ||
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| # Starting checkpoint has been found so update the system for the rest updates | ||
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| for(( i="$starting_checkpoint"; i<="$end_of_list"; i++)); do | ||
| update_file=${updates_list[i]} | ||
| tag_update=$( basename "$update_file" .sh ) | ||
| echo -e "Updating system to version $tag_update . . ." | ||
| ./"$updates"/"$update_file" || exit 1 | ||
| echo -e "System updated successfully to version $tag_update" | ||
| echo "v$tag_update" > /usr/local/etc/ncp-version | ||
| done | ||
| fi | ||
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