diff --git a/Gemfile b/Gemfile
index 1c822a40fc6cda96e78159ead695a00335ae4054..6d820e1f88782ab77e2794b202fb69838b34374f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -82,7 +82,7 @@ gem 'net-ldap'
 
 # Git Wiki
 # Required manually in config/initializers/gollum.rb to control load order
-gem 'gitlab-gollum-lib', '~> 4.2'
+gem 'gitlab-gollum-lib', '~> 4.2', require: false
 
 gem 'gitlab-gollum-rugged_adapter', '~> 0.4.4', require: false
 
@@ -415,7 +415,7 @@ group :ed25519 do
 end
 
 # Gitaly GRPC client
-gem 'gitaly-proto', '~> 0.94.0', require: 'gitaly'
+gem 'gitaly-proto', '~> 0.97.0', require: 'gitaly'
 gem 'grpc', '~> 1.10.0'
 
 # Locked until https://github.com/google/protobuf/issues/4210 is closed
diff --git a/Gemfile.lock b/Gemfile.lock
index 7f243491c90eb5e231ba592cf8b83ef0af2cf5a5..3076fbee6a88dea99a92dc0d5be5eec6342edbdd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -290,9 +290,9 @@ GEM
       po_to_json (>= 1.0.0)
       rails (>= 3.2.0)
     gherkin-ruby (0.3.2)
-    gitaly-proto (0.94.0)
+    gitaly-proto (0.97.0)
       google-protobuf (~> 3.1)
-      grpc (~> 1.0)
+      grpc (~> 1.10)
     github-linguist (5.3.3)
       charlock_holmes (~> 0.7.5)
       escape_utils (~> 1.1.0)
@@ -1064,7 +1064,7 @@ DEPENDENCIES
   gettext (~> 3.2.2)
   gettext_i18n_rails (~> 1.8.0)
   gettext_i18n_rails_js (~> 1.3)
-  gitaly-proto (~> 0.94.0)
+  gitaly-proto (~> 0.97.0)
   github-linguist (~> 5.3.3)
   gitlab-flowdock-git-hook (~> 1.0.1)
   gitlab-gollum-lib (~> 4.2)
diff --git a/app/controllers/projects/wikis_controller.rb b/app/controllers/projects/wikis_controller.rb
index c4930d3d18d736d36504bdaf8a0602ddc1662b4e..1b0751f48c57006456e41f1e06ad0dcfe3b83490 100644
--- a/app/controllers/projects/wikis_controller.rb
+++ b/app/controllers/projects/wikis_controller.rb
@@ -29,8 +29,7 @@ class Projects::WikisController < Projects::ApplicationController
     else
       return render('empty') unless can?(current_user, :create_wiki, @project)
 
-      @page = WikiPage.new(@project_wiki)
-      @page.title = params[:id]
+      @page = build_page(title: params[:id])
 
       render 'edit'
     end
@@ -54,7 +53,7 @@ class Projects::WikisController < Projects::ApplicationController
     else
       render 'edit'
     end
-  rescue WikiPage::PageChangedError, WikiPage::PageRenameError => e
+  rescue WikiPage::PageChangedError, WikiPage::PageRenameError, Gitlab::Git::Wiki::OperationError => e
     @error = e
     render 'edit'
   end
@@ -70,6 +69,11 @@ class Projects::WikisController < Projects::ApplicationController
     else
       render action: "edit"
     end
+  rescue Gitlab::Git::Wiki::OperationError => e
+    @page = build_page(wiki_params)
+    @error = e
+
+    render 'edit'
   end
 
   def history
@@ -94,6 +98,9 @@ class Projects::WikisController < Projects::ApplicationController
     redirect_to project_wiki_path(@project, :home),
                 status: 302,
                 notice: "Page was successfully deleted"
+  rescue Gitlab::Git::Wiki::OperationError => e
+    @error = e
+    render 'edit'
   end
 
   def git_access
@@ -116,4 +123,10 @@ class Projects::WikisController < Projects::ApplicationController
   def wiki_params
     params.require(:wiki).permit(:title, :content, :format, :message, :last_commit_sha)
   end
+
+  def build_page(args)
+    WikiPage.new(@project_wiki).tap do |page|
+      page.update_attributes(args)
+    end
+  end
 end
diff --git a/app/helpers/nav_helper.rb b/app/helpers/nav_helper.rb
index 56c88e6eab0db7b9a92651faf22cb0a1fe62fdb3..7754c34d6f03c6c8d4931a679d29d7f7332a157d 100644
--- a/app/helpers/nav_helper.rb
+++ b/app/helpers/nav_helper.rb
@@ -28,7 +28,7 @@ module NavHelper
       end
     elsif current_path?('jobs#show')
       %w[page-gutter build-sidebar right-sidebar-expanded]
-    elsif current_controller?('wikis') && current_action?('show', 'create', 'edit', 'update', 'history', 'git_access')
+    elsif current_controller?('wikis') && current_action?('show', 'create', 'edit', 'update', 'history', 'git_access', 'destroy')
       %w[page-gutter wiki-sidebar right-sidebar-expanded]
     else
       []
diff --git a/app/models/project_wiki.rb b/app/models/project_wiki.rb
index 52e067cb44c5ffddcaa591792d9e739bcb83de71..b7e38ceb5021a0dfdab7269914b528b9396166af 100644
--- a/app/models/project_wiki.rb
+++ b/app/models/project_wiki.rb
@@ -179,7 +179,11 @@ class ProjectWiki
   def commit_details(action, message = nil, title = nil)
     commit_message = message || default_message(action, title)
 
-    Gitlab::Git::Wiki::CommitDetails.new(@user.name, @user.email, commit_message)
+    Gitlab::Git::Wiki::CommitDetails.new(@user.id,
+                                         @user.username,
+                                         @user.name,
+                                         @user.email,
+                                         commit_message)
   end
 
   def default_message(action, title)
diff --git a/app/models/wiki_page.rb b/app/models/wiki_page.rb
index 0f5536415f79ceea274c468cc0da5f14694d2799..cde79b95062373e177ccd37503267477bb1e9930 100644
--- a/app/models/wiki_page.rb
+++ b/app/models/wiki_page.rb
@@ -265,6 +265,15 @@ class WikiPage
     title.present? && self.class.unhyphenize(@page.url_path) != title
   end
 
+  # Updates the current @attributes hash by merging a hash of params
+  def update_attributes(attrs)
+    attrs[:title] = process_title(attrs[:title]) if attrs[:title].present?
+
+    attrs.slice!(:content, :format, :message, :title)
+
+    @attributes.merge!(attrs)
+  end
+
   private
 
   # Process and format the title based on the user input.
@@ -290,15 +299,6 @@ class WikiPage
     File.join(components)
   end
 
-  # Updates the current @attributes hash by merging a hash of params
-  def update_attributes(attrs)
-    attrs[:title] = process_title(attrs[:title]) if attrs[:title].present?
-
-    attrs.slice!(:content, :format, :message, :title)
-
-    @attributes.merge!(attrs)
-  end
-
   def set_attributes
     attributes[:slug] = @page.url_path
     attributes[:title] = @page.title
diff --git a/changelogs/unreleased/fj-42354-custom-hooks-not-triggered-by-UI-wiki-edit.yml b/changelogs/unreleased/fj-42354-custom-hooks-not-triggered-by-UI-wiki-edit.yml
new file mode 100644
index 0000000000000000000000000000000000000000..9fe458aba4a4937bab91efce7d1027cc36f2d67a
--- /dev/null
+++ b/changelogs/unreleased/fj-42354-custom-hooks-not-triggered-by-UI-wiki-edit.yml
@@ -0,0 +1,5 @@
+---
+title: Triggering custom hooks by Wiki UI edit
+merge_request: 18251
+author:
+type: fixed
diff --git a/lib/gitlab/git/wiki.rb b/lib/gitlab/git/wiki.rb
index 8d82820915db63adbab1f7e957adba6f13ffdbc8..821436911ab50bd2abe9b7ff3f604c0d2ae712cf 100644
--- a/lib/gitlab/git/wiki.rb
+++ b/lib/gitlab/git/wiki.rb
@@ -2,10 +2,11 @@ module Gitlab
   module Git
     class Wiki
       DuplicatePageError = Class.new(StandardError)
+      OperationError = Class.new(StandardError)
 
-      CommitDetails = Struct.new(:name, :email, :message) do
+      CommitDetails = Struct.new(:user_id, :username, :name, :email, :message) do
         def to_h
-          { name: name, email: email, message: message }
+          { user_id: user_id, username: username, name: name, email: email, message: message }
         end
       end
       PageBlob = Struct.new(:name)
@@ -140,6 +141,10 @@ module Gitlab
         end
       end
 
+      def gollum_wiki
+        @gollum_wiki ||= Gollum::Wiki.new(@repository.path)
+      end
+
       private
 
       # options:
@@ -158,10 +163,6 @@ module Gitlab
                         offset: options[:offset])
       end
 
-      def gollum_wiki
-        @gollum_wiki ||= Gollum::Wiki.new(@repository.path)
-      end
-
       def gollum_page_by_path(page_path)
         page_name = Gollum::Page.canonicalize_filename(page_path)
         page_dir = File.split(page_path).first
@@ -201,12 +202,12 @@ module Gitlab
         assert_type!(format, Symbol)
         assert_type!(commit_details, CommitDetails)
 
-        filename = File.basename(name)
-        dir = (tmp_dir = File.dirname(name)) == '.' ? '' : tmp_dir
-
-        gollum_wiki.write_page(filename, format, content, commit_details.to_h, dir)
+        with_committer_with_hooks(commit_details) do |committer|
+          filename = File.basename(name)
+          dir = (tmp_dir = File.dirname(name)) == '.' ? '' : tmp_dir
 
-        nil
+          gollum_wiki.write_page(filename, format, content, { committer: committer }, dir)
+        end
       rescue Gollum::DuplicatePageError => e
         raise Gitlab::Git::Wiki::DuplicatePageError, e.message
       end
@@ -214,24 +215,23 @@ module Gitlab
       def gollum_delete_page(page_path, commit_details)
         assert_type!(commit_details, CommitDetails)
 
-        gollum_wiki.delete_page(gollum_page_by_path(page_path), commit_details.to_h)
-        nil
+        with_committer_with_hooks(commit_details) do |committer|
+          gollum_wiki.delete_page(gollum_page_by_path(page_path), committer: committer)
+        end
       end
 
       def gollum_update_page(page_path, title, format, content, commit_details)
         assert_type!(format, Symbol)
         assert_type!(commit_details, CommitDetails)
 
-        page = gollum_page_by_path(page_path)
-        committer = Gollum::Committer.new(page.wiki, commit_details.to_h)
-
-        # Instead of performing two renames if the title has changed,
-        # the update_page will only update the format and content and
-        # the rename_page will do anything related to moving/renaming
-        gollum_wiki.update_page(page, page.name, format, content, committer: committer)
-        gollum_wiki.rename_page(page, title, committer: committer)
-        committer.commit
-        nil
+        with_committer_with_hooks(commit_details) do |committer|
+          page = gollum_page_by_path(page_path)
+          # Instead of performing two renames if the title has changed,
+          # the update_page will only update the format and content and
+          # the rename_page will do anything related to moving/renaming
+          gollum_wiki.update_page(page, page.name, format, content, committer: committer)
+          gollum_wiki.rename_page(page, title, committer: committer)
+        end
       end
 
       def gollum_find_page(title:, version: nil, dir: nil)
@@ -288,6 +288,20 @@ module Gitlab
           Gitlab::Git::WikiPage.new(wiki_page, version)
         end
       end
+
+      def committer_with_hooks(commit_details)
+        Gitlab::Wiki::CommitterWithHooks.new(self, commit_details.to_h)
+      end
+
+      def with_committer_with_hooks(commit_details, &block)
+        committer = committer_with_hooks(commit_details)
+
+        yield committer
+
+        committer.commit
+
+        nil
+      end
     end
   end
 end
diff --git a/lib/gitlab/gitaly_client/wiki_service.rb b/lib/gitlab/gitaly_client/wiki_service.rb
index 7a698e4b3f39e58609128c438dc5f468ba157b74..2dfe055a496b9548ee851b0c2d32e2c13959ba81 100644
--- a/lib/gitlab/gitaly_client/wiki_service.rb
+++ b/lib/gitlab/gitaly_client/wiki_service.rb
@@ -200,6 +200,8 @@ module Gitlab
 
       def gitaly_commit_details(commit_details)
         Gitaly::WikiCommitDetails.new(
+          user_id: commit_details.user_id,
+          user_name: encode_binary(commit_details.username),
           name: encode_binary(commit_details.name),
           email: encode_binary(commit_details.email),
           message: encode_binary(commit_details.message)
diff --git a/lib/gitlab/gl_id.rb b/lib/gitlab/gl_id.rb
index 624fd00367e0f5c128497449630242824b62e416..a53d156b41f3fa7e28204d5b301c4fed62329153 100644
--- a/lib/gitlab/gl_id.rb
+++ b/lib/gitlab/gl_id.rb
@@ -2,10 +2,14 @@ module Gitlab
   module GlId
     def self.gl_id(user)
       if user.present?
-        "user-#{user.id}"
+        gl_id_from_id_value(user.id)
       else
-        ""
+        ''
       end
     end
+
+    def self.gl_id_from_id_value(id)
+      "user-#{id}"
+    end
   end
 end
diff --git a/lib/gitlab/wiki/committer_with_hooks.rb b/lib/gitlab/wiki/committer_with_hooks.rb
new file mode 100644
index 0000000000000000000000000000000000000000..19f0b3814fd48e998043274d197a33faef2edaf0
--- /dev/null
+++ b/lib/gitlab/wiki/committer_with_hooks.rb
@@ -0,0 +1,39 @@
+module Gitlab
+  module Wiki
+    class CommitterWithHooks < Gollum::Committer
+      attr_reader :gl_wiki
+
+      def initialize(gl_wiki, options = {})
+        @gl_wiki = gl_wiki
+        super(gl_wiki.gollum_wiki, options)
+      end
+
+      def commit
+        result = Gitlab::Git::OperationService.new(git_user, gl_wiki.repository).with_branch(
+          @wiki.ref,
+          start_branch_name: @wiki.ref
+        ) do |start_commit|
+          super(false)
+        end
+
+        result[:newrev]
+      rescue Gitlab::Git::HooksService::PreReceiveError => e
+        message = "Custom Hook failed: #{e.message}"
+        raise Gitlab::Git::Wiki::OperationError, message
+      end
+
+      private
+
+      def git_user
+        @git_user ||= Gitlab::Git::User.new(@options[:username],
+                                            @options[:name],
+                                            @options[:email],
+                                            gitlab_id)
+      end
+
+      def gitlab_id
+        Gitlab::GlId.gl_id_from_id_value(@options[:user_id])
+      end
+    end
+  end
+end
diff --git a/spec/lib/gitlab/git/wiki_spec.rb b/spec/lib/gitlab/git/wiki_spec.rb
index 761f77320365b18bdd3f0b6986d3dbb4c7a5dc37..722d697c28e8cbdaaa43a52a47af5098dab1c65e 100644
--- a/spec/lib/gitlab/git/wiki_spec.rb
+++ b/spec/lib/gitlab/git/wiki_spec.rb
@@ -30,7 +30,7 @@ describe Gitlab::Git::Wiki do
   end
 
   def commit_details(name)
-    Gitlab::Git::Wiki::CommitDetails.new(user.name, user.email, "created page #{name}")
+    Gitlab::Git::Wiki::CommitDetails.new(user.id, user.username, user.name, user.email, "created page #{name}")
   end
 
   def destroy_page(title, dir = '')
diff --git a/spec/lib/gitlab/wiki/committer_with_hooks_spec.rb b/spec/lib/gitlab/wiki/committer_with_hooks_spec.rb
new file mode 100644
index 0000000000000000000000000000000000000000..830fb8a85983f64287942ce5d211876edaac230b
--- /dev/null
+++ b/spec/lib/gitlab/wiki/committer_with_hooks_spec.rb
@@ -0,0 +1,154 @@
+require 'spec_helper'
+
+describe Gitlab::Wiki::CommitterWithHooks, seed_helper: true do
+  shared_examples 'calling wiki hooks' do
+    let(:project) { create(:project) }
+    let(:user) { project.owner }
+    let(:project_wiki) { ProjectWiki.new(project, user) }
+    let(:wiki) { project_wiki.wiki }
+    let(:options) do
+      {
+        id: user.id,
+        username: user.username,
+        name: user.name,
+        email: user.email,
+        message: 'commit message'
+      }
+    end
+
+    subject { described_class.new(wiki, options) }
+
+    before do
+      project_wiki.create_page('home', 'test content')
+    end
+
+    shared_examples 'failing pre-receive hook' do
+      before do
+        expect_any_instance_of(Gitlab::Git::HooksService).to receive(:run_hook).with('pre-receive').and_return([false, ''])
+        expect_any_instance_of(Gitlab::Git::HooksService).not_to receive(:run_hook).with('update')
+        expect_any_instance_of(Gitlab::Git::HooksService).not_to receive(:run_hook).with('post-receive')
+      end
+
+      it 'raises exception' do
+        expect { subject.commit }.to raise_error(Gitlab::Git::Wiki::OperationError)
+      end
+
+      it 'does not create a new commit inside the repository' do
+        current_rev = find_current_rev
+
+        expect { subject.commit }.to raise_error(Gitlab::Git::Wiki::OperationError)
+
+        expect(current_rev).to eq find_current_rev
+      end
+    end
+
+    shared_examples 'failing update hook' do
+      before do
+        expect_any_instance_of(Gitlab::Git::HooksService).to receive(:run_hook).with('pre-receive').and_return([true, ''])
+        expect_any_instance_of(Gitlab::Git::HooksService).to receive(:run_hook).with('update').and_return([false, ''])
+        expect_any_instance_of(Gitlab::Git::HooksService).not_to receive(:run_hook).with('post-receive')
+      end
+
+      it 'raises exception' do
+        expect { subject.commit }.to raise_error(Gitlab::Git::Wiki::OperationError)
+      end
+
+      it 'does not create a new commit inside the repository' do
+        current_rev = find_current_rev
+
+        expect { subject.commit }.to raise_error(Gitlab::Git::Wiki::OperationError)
+
+        expect(current_rev).to eq find_current_rev
+      end
+    end
+
+    shared_examples 'failing post-receive hook' do
+      before do
+        expect_any_instance_of(Gitlab::Git::HooksService).to receive(:run_hook).with('pre-receive').and_return([true, ''])
+        expect_any_instance_of(Gitlab::Git::HooksService).to receive(:run_hook).with('update').and_return([true, ''])
+        expect_any_instance_of(Gitlab::Git::HooksService).to receive(:run_hook).with('post-receive').and_return([false, ''])
+      end
+
+      it 'does not raise exception' do
+        expect { subject.commit }.not_to raise_error
+      end
+
+      it 'creates the commit' do
+        current_rev = find_current_rev
+
+        subject.commit
+
+        expect(current_rev).not_to eq find_current_rev
+      end
+    end
+
+    shared_examples 'when hooks call succceeds' do
+      let(:hook) { double(:hook) }
+
+      it 'calls the three hooks' do
+        expect(Gitlab::Git::Hook).to receive(:new).exactly(3).times.and_return(hook)
+        expect(hook).to receive(:trigger).exactly(3).times.and_return([true, nil])
+
+        subject.commit
+      end
+
+      it 'creates the commit' do
+        current_rev = find_current_rev
+
+        subject.commit
+
+        expect(current_rev).not_to eq find_current_rev
+      end
+    end
+
+    context 'when creating a page' do
+      before do
+        project_wiki.create_page('index', 'test content')
+      end
+
+      it_behaves_like 'failing pre-receive hook'
+      it_behaves_like 'failing update hook'
+      it_behaves_like 'failing post-receive hook'
+      it_behaves_like 'when hooks call succceeds'
+    end
+
+    context 'when updating a page' do
+      before do
+        project_wiki.update_page(find_page('home'), content: 'some other content', format: :markdown)
+      end
+
+      it_behaves_like 'failing pre-receive hook'
+      it_behaves_like 'failing update hook'
+      it_behaves_like 'failing post-receive hook'
+      it_behaves_like 'when hooks call succceeds'
+    end
+
+    context 'when deleting a page' do
+      before do
+        project_wiki.delete_page(find_page('home'))
+      end
+
+      it_behaves_like 'failing pre-receive hook'
+      it_behaves_like 'failing update hook'
+      it_behaves_like 'failing post-receive hook'
+      it_behaves_like 'when hooks call succceeds'
+    end
+
+    def find_current_rev
+      wiki.gollum_wiki.repo.commits.first&.sha
+    end
+
+    def find_page(name)
+      wiki.page(title: name)
+    end
+  end
+
+  # TODO: Uncomment once Gitaly updates the ruby vendor code
+  # context 'when Gitaly is enabled' do
+  #   it_behaves_like 'calling wiki hooks'
+  # end
+
+  context 'when Gitaly is disabled', :skip_gitaly_mock do
+    it_behaves_like 'calling wiki hooks'
+  end
+end
diff --git a/spec/models/project_wiki_spec.rb b/spec/models/project_wiki_spec.rb
index 374a157bec007147d6a61a2a1b4cb9c09e8b2e8a..4e83f4353cf8540d29c8518f89b4b9c85b8438bb 100644
--- a/spec/models/project_wiki_spec.rb
+++ b/spec/models/project_wiki_spec.rb
@@ -377,7 +377,7 @@ describe ProjectWiki do
   end
 
   def commit_details
-    Gitlab::Git::Wiki::CommitDetails.new(user.name, user.email, "test commit")
+    Gitlab::Git::Wiki::CommitDetails.new(user.id, user.username, user.name, user.email, "test commit")
   end
 
   def create_page(name, content)
diff --git a/spec/models/wiki_page_spec.rb b/spec/models/wiki_page_spec.rb
index b2b7721674c5797efcf92018fd30912ed058385d..90b7e7715a84da0a51051d274dc1fc870225b80b 100644
--- a/spec/models/wiki_page_spec.rb
+++ b/spec/models/wiki_page_spec.rb
@@ -561,7 +561,7 @@ describe WikiPage do
   end
 
   def commit_details
-    Gitlab::Git::Wiki::CommitDetails.new(user.name, user.email, "test commit")
+    Gitlab::Git::Wiki::CommitDetails.new(user.id, user.username, user.name, user.email, "test commit")
   end
 
   def create_page(name, content)