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104 lines
3.7 KiB
104 lines
3.7 KiB
module Tasks
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module Shared
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##
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# In the olden times (pre 4.1) files were all saved under the configured storage path,
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# most likely `files`, with a timestamp attached to their name to avoid conflicts.
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#
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# e.g. `files/140917231758_openshift-setup.txt`
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#
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# The new approach is using CarrierWave for attachments. There the files will be stored
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# some place else. Where is not material for this migration.
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# It could be another directory or S3.
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#
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# The migration does the following:
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#
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# * rename the legacy files - it strips off the timestamps
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# * assign the renamed file to the CarrierWave uploader - this moves the file to
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# the new location
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#
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# The rollback does the opposite using the remaining legacy column `disk_filename`
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# of Attachment. Meaning it adds the timestamp again and puts the files back into
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# the configured attachment storage path.
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#
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# This assumes that the attachment storage path is the same as before the migration
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# to CarrierWave and also that the legacy columns `filename` and `disk_filename`
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# are still present.
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module LegacyAttachment
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module_function
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def migrate_attachment(attachment)
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file = legacy_file_name attachment.disk_filename
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new_file = strip_timestamp_from_filename(file)
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if File.readable? file
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FileUtils.move file, new_file
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attachment.file = File.open(new_file)
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attachment.filename = ''
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attachment.save!
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FileUtils.rm_f new_file
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File.readable? attachment.file.path
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else
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path = attachment.file.path
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if path && File.readable?(path)
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true # file has been migrated already
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else
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puts "Found corrupt attachment (#{attachment.id}) during migration: \
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'#{file}' does not exist".squish
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false
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end
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end
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end
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def rollback_attachment(attachment)
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return unless attachment.file.path
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old_file = rolled_back_file_name attachment
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unless File.readable? old_file
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file = attachment.diskfile.path
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FileUtils.move file, old_file
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attachment.update_column :file, nil
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attachment.update_column :filename, Pathname(file).basename.to_s
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# keep original disk filename if it was preserved
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if attachment.disk_filename.blank?
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attachment.update_column :disk_filename, Pathname(old_file).basename.to_s
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end
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FileUtils.rmdir Pathname(file).dirname
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end
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end
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##
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# Returns rolled back file name for an attachment.
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# If an attachment was created after the migration to CarrierWave it doesn't have an original
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# legacy name. Instead one will be generated. Not with a timestamp, however, but with a
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# random hex string as a prefix.
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#
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# This way new attachments won't be lost when rolling back to an old version of OpenProject.
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def rolled_back_file_name(attachment)
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if attachment.disk_filename.blank?
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uuid = SecureRandom.hex 4
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name = Pathname(attachment.diskfile.path).basename
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legacy_file_name "#{uuid}_#{name}"
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else
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legacy_file_name attachment.disk_filename
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end
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end
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def legacy_file_name(file_name)
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Pathname(OpenProject::Configuration.attachments_storage_path).join file_name
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end
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##
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# This method strips the leading timestamp from a given file name and returns the plain,
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# original file name.
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def strip_timestamp_from_filename(file)
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Pathname(file).dirname + Pathname(file).basename.to_s.gsub(/^[^_]+_/, '')
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end
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end
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end
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end
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