diff options
Diffstat (limited to 'lib/gitlab/git/diff.rb')
| -rw-r--r-- | lib/gitlab/git/diff.rb | 322 |
1 files changed, 322 insertions, 0 deletions
diff --git a/lib/gitlab/git/diff.rb b/lib/gitlab/git/diff.rb new file mode 100644 index 00000000000..d6b3b5705a9 --- /dev/null +++ b/lib/gitlab/git/diff.rb @@ -0,0 +1,322 @@ +# Gitlab::Git::Diff is a wrapper around native Rugged::Diff object +module Gitlab + module Git + class Diff + class TimeoutError < StandardError; end + include Gitlab::Git::EncodingHelper + + # Diff properties + attr_accessor :old_path, :new_path, :a_mode, :b_mode, :diff + + # Stats properties + attr_accessor :new_file, :renamed_file, :deleted_file + + attr_accessor :too_large + + # The maximum size of a diff to display. + DIFF_SIZE_LIMIT = 102400 # 100 KB + + # The maximum size before a diff is collapsed. + DIFF_COLLAPSE_LIMIT = 10240 # 10 KB + + class << self + def between(repo, head, base, options = {}, *paths) + straight = options.delete(:straight) || false + + common_commit = if straight + base + else + # Only show what is new in the source branch + # compared to the target branch, not the other way + # around. The linex below with merge_base is + # equivalent to diff with three dots (git diff + # branch1...branch2) From the git documentation: + # "git diff A...B" is equivalent to "git diff + # $(git-merge-base A B) B" + repo.merge_base_commit(head, base) + end + + options ||= {} + actual_options = filter_diff_options(options) + repo.diff(common_commit, head, actual_options, *paths) + end + + # Return a copy of the +options+ hash containing only keys that can be + # passed to Rugged. Allowed options are: + # + # :max_size :: + # An integer specifying the maximum byte size of a file before a it + # will be treated as binary. The default value is 512MB. + # + # :context_lines :: + # The number of unchanged lines that define the boundary of a hunk + # (and to display before and after the actual changes). The default is + # 3. + # + # :interhunk_lines :: + # The maximum number of unchanged lines between hunk boundaries before + # the hunks will be merged into a one. The default is 0. + # + # :old_prefix :: + # The virtual "directory" to prefix to old filenames in hunk headers. + # The default is "a". + # + # :new_prefix :: + # The virtual "directory" to prefix to new filenames in hunk headers. + # The default is "b". + # + # :reverse :: + # If true, the sides of the diff will be reversed. + # + # :force_text :: + # If true, all files will be treated as text, disabling binary + # attributes & detection. + # + # :ignore_whitespace :: + # If true, all whitespace will be ignored. + # + # :ignore_whitespace_change :: + # If true, changes in amount of whitespace will be ignored. + # + # :ignore_whitespace_eol :: + # If true, whitespace at end of line will be ignored. + # + # :ignore_submodules :: + # if true, submodules will be excluded from the diff completely. + # + # :patience :: + # If true, the "patience diff" algorithm will be used (currenlty + # unimplemented). + # + # :include_ignored :: + # If true, ignored files will be included in the diff. + # + # :include_untracked :: + # If true, untracked files will be included in the diff. + # + # :include_unmodified :: + # If true, unmodified files will be included in the diff. + # + # :recurse_untracked_dirs :: + # Even if +:include_untracked+ is true, untracked directories will + # only be marked with a single entry in the diff. If this flag is set + # to true, all files under ignored directories will be included in the + # diff, too. + # + # :disable_pathspec_match :: + # If true, the given +*paths+ will be applied as exact matches, + # instead of as fnmatch patterns. + # + # :deltas_are_icase :: + # If true, filename comparisons will be made with case-insensitivity. + # + # :include_untracked_content :: + # if true, untracked content will be contained in the the diff patch + # text. + # + # :skip_binary_check :: + # If true, diff deltas will be generated without spending time on + # binary detection. This is useful to improve performance in cases + # where the actual file content difference is not needed. + # + # :include_typechange :: + # If true, type changes for files will not be interpreted as deletion + # of the "old file" and addition of the "new file", but will generate + # typechange records. + # + # :include_typechange_trees :: + # Even if +:include_typechange+ is true, blob -> tree changes will + # still usually be handled as a deletion of the blob. If this flag is + # set to true, blob -> tree changes will be marked as typechanges. + # + # :ignore_filemode :: + # If true, file mode changes will be ignored. + # + # :recurse_ignored_dirs :: + # Even if +:include_ignored+ is true, ignored directories will only be + # marked with a single entry in the diff. If this flag is set to true, + # all files under ignored directories will be included in the diff, + # too. + def filter_diff_options(options, default_options = {}) + allowed_options = [:max_size, :context_lines, :interhunk_lines, + :old_prefix, :new_prefix, :reverse, :force_text, + :ignore_whitespace, :ignore_whitespace_change, + :ignore_whitespace_eol, :ignore_submodules, + :patience, :include_ignored, :include_untracked, + :include_unmodified, :recurse_untracked_dirs, + :disable_pathspec_match, :deltas_are_icase, + :include_untracked_content, :skip_binary_check, + :include_typechange, :include_typechange_trees, + :ignore_filemode, :recurse_ignored_dirs, :paths, + :max_files, :max_lines, :all_diffs, :no_collapse] + + if default_options + actual_defaults = default_options.dup + actual_defaults.keep_if do |key| + allowed_options.include?(key) + end + else + actual_defaults = {} + end + + if options + filtered_opts = options.dup + filtered_opts.keep_if do |key| + allowed_options.include?(key) + end + filtered_opts = actual_defaults.merge(filtered_opts) + else + filtered_opts = actual_defaults + end + + filtered_opts + end + end + + def initialize(raw_diff, collapse: false) + case raw_diff + when Hash + init_from_hash(raw_diff, collapse: collapse) + when Rugged::Patch, Rugged::Diff::Delta + init_from_rugged(raw_diff, collapse: collapse) + when nil + raise "Nil as raw diff passed" + else + raise "Invalid raw diff type: #{raw_diff.class}" + end + end + + def serialize_keys + @serialize_keys ||= %i(diff new_path old_path a_mode b_mode new_file renamed_file deleted_file too_large) + end + + def to_hash + hash = {} + + keys = serialize_keys + + keys.each do |key| + hash[key] = send(key) + end + + hash + end + + def submodule? + a_mode == '160000' || b_mode == '160000' + end + + def line_count + @line_count ||= Util.count_lines(@diff) + end + + def too_large? + if @too_large.nil? + @too_large = @diff.bytesize >= DIFF_SIZE_LIMIT + else + @too_large + end + end + + def collapsible? + @diff.bytesize >= DIFF_COLLAPSE_LIMIT + end + + def prune_large_diff! + @diff = '' + @line_count = 0 + @too_large = true + end + + def collapsed? + return @collapsed if defined?(@collapsed) + false + end + + def prune_collapsed_diff! + @diff = '' + @line_count = 0 + @collapsed = true + end + + private + + def init_from_rugged(rugged, collapse: false) + if rugged.is_a?(Rugged::Patch) + init_from_rugged_patch(rugged, collapse: collapse) + d = rugged.delta + else + d = rugged + end + + @new_path = encode!(d.new_file[:path]) + @old_path = encode!(d.old_file[:path]) + @a_mode = d.old_file[:mode].to_s(8) + @b_mode = d.new_file[:mode].to_s(8) + @new_file = d.added? + @renamed_file = d.renamed? + @deleted_file = d.deleted? + end + + def init_from_rugged_patch(patch, collapse: false) + # Don't bother initializing diffs that are too large. If a diff is + # binary we're not going to display anything so we skip the size check. + return if !patch.delta.binary? && prune_large_patch(patch, collapse) + + @diff = encode!(strip_diff_headers(patch.to_s)) + end + + def init_from_hash(hash, collapse: false) + raw_diff = hash.symbolize_keys + + serialize_keys.each do |key| + send(:"#{key}=", raw_diff[key.to_sym]) + end + + prune_large_diff! if too_large? + prune_collapsed_diff! if collapse && collapsible? + end + + # If the patch surpasses any of the diff limits it calls the appropiate + # prune method and returns true. Otherwise returns false. + def prune_large_patch(patch, collapse) + size = 0 + + patch.each_hunk do |hunk| + hunk.each_line do |line| + size += line.content.bytesize + + if size >= DIFF_SIZE_LIMIT + prune_large_diff! + return true + end + end + end + + if collapse && size >= DIFF_COLLAPSE_LIMIT + prune_collapsed_diff! + return true + end + + false + end + + # Strip out the information at the beginning of the patch's text to match + # Grit's output + def strip_diff_headers(diff_text) + # Delete everything up to the first line that starts with '---' or + # 'Binary' + diff_text.sub!(/\A.*?^(---|Binary)/m, '\1') + + if diff_text.start_with?('---', 'Binary') + diff_text + else + # If the diff_text did not contain a line starting with '---' or + # 'Binary', return the empty string. No idea why; we are just + # preserving behavior from before the refactor. + '' + end + end + end + end +end |