Class: Docker::Image
Overview
This class represents a Docker Image.
Instance Attribute Summary
Attributes included from Base
Class Method Summary collapse
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.all(opts = {}, conn = Docker.connection) ⇒ Object
Return every Image.
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.build(commands, opts = {}, connection = Docker.connection, &block) ⇒ Object
Given a Dockerfile as a string, builds an Image.
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.build_from_dir(dir, opts = {}, connection = Docker.connection, &block) ⇒ Object
Given a directory that contains a Dockerfile, builds an Image.
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.create(opts = {}, creds = nil, conn = Docker.connection) ⇒ Object
Create a new Image.
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.get(id, opts = {}, conn = Docker.connection) ⇒ Object
Return a specific image.
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.import(imp, opts = {}, conn = Docker.connection) ⇒ Object
Import an Image from the output of Docker::Container#export.
- .import_stream(options = {}, connection = Docker.connection, &block) ⇒ Object
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.search(query = {}, connection = Docker.connection) ⇒ Object
Given a query like ‘{ :term => ’sshd’ }‘, queries the Docker Registry for a corresponding Image.
Instance Method Summary collapse
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#insert(query = {}) ⇒ Object
Insert a file into the Image, returns a new Image that has that file.
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#insert_local(opts = {}) ⇒ Object
Given a path of a local file and the path it should be inserted, creates a new Image that has that file.
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#push(creds = nil, options = {}) ⇒ Object
Push the Image to the Docker registry.
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#refresh! ⇒ Object
Update the @info hash, which is the only mutable state in this object.
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#remove(opts = {}) ⇒ Object
(also: #delete)
Remove the Image from the server.
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#run(cmd = nil) ⇒ Object
Given a command and optional list of streams to attach to, run a command on an Image.
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#tag(opts = {}) ⇒ Object
Tag the Image.
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#to_s ⇒ Object
Return a String representation of the Image.
Methods included from Base
Class Method Details
.all(opts = {}, conn = Docker.connection) ⇒ Object
Return every Image.
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# File 'lib/docker/image.rb', line 124 def all(opts = {}, conn = Docker.connection) hashes = Docker::Util.parse_json(conn.get('/images/json', opts)) || [] hashes.map { |hash| new(conn, hash) } end |
.build(commands, opts = {}, connection = Docker.connection, &block) ⇒ Object
Given a Dockerfile as a string, builds an Image.
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# File 'lib/docker/image.rb', line 161 def build(commands, opts = {}, connection = Docker.connection, &block) body = "" connection.post( '/build', opts, :body => Docker::Util.create_tar('Dockerfile' => commands), :response_block => response_block_for_build(body, &block) ) new(connection, 'id' => Docker::Util.extract_id(body)) rescue Docker::Error::ServerError raise Docker::Error::UnexpectedResponseError end |
.build_from_dir(dir, opts = {}, connection = Docker.connection, &block) ⇒ Object
Given a directory that contains a Dockerfile, builds an Image.
If a block is passed, chunks of output produced by Docker will be passed to that block.
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# File 'lib/docker/image.rb', line 177 def build_from_dir(dir, opts = {}, connection = Docker.connection, &block) tar = Docker::Util.create_dir_tar(dir) # The response_block passed to Excon will build up this body variable. body = "" connection.post( '/build', opts, :headers => { 'Content-Type' => 'application/tar', 'Transfer-Encoding' => 'chunked' }, :response_block => response_block_for_build(body, &block) ) { tar.read(Excon.defaults[:chunk_size]).to_s } new(connection, 'id' => Docker::Util.extract_id(body)) ensure tar.close unless tar.nil? end |
.create(opts = {}, creds = nil, conn = Docker.connection) ⇒ Object
Create a new Image.
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# File 'lib/docker/image.rb', line 107 def create(opts = {}, creds = nil, conn = Docker.connection) credentials = creds.nil? ? Docker.creds : creds.to_json headers = !credentials.nil? && Docker::Util.build_auth_header(credentials) headers ||= {} body = conn.post('/images/create', opts, :headers => headers) id = Docker::Util.fix_json(body).last['id'] new(conn, 'id' => id, :headers => headers) end |
.get(id, opts = {}, conn = Docker.connection) ⇒ Object
Return a specific image.
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# File 'lib/docker/image.rb', line 117 def get(id, opts = {}, conn = Docker.connection) image_json = conn.get("/images/#{URI.encode(id)}/json", opts) hash = Docker::Util.parse_json(image_json) || {} new(conn, hash) end |
.import(imp, opts = {}, conn = Docker.connection) ⇒ Object
Import an Image from the output of Docker::Container#export. The first argument may either be a File or URI.
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# File 'lib/docker/image.rb', line 139 def import(imp, opts = {}, conn = Docker.connection) open(imp) do |io| import_stream(opts, conn) do io.read(Excon.defaults[:chunk_size]).to_s end end rescue StandardError raise Docker::Error::IOError, "Could not import '#{imp}'" end |
.import_stream(options = {}, connection = Docker.connection, &block) ⇒ Object
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# File 'lib/docker/image.rb', line 149 def import_stream( = {}, connection = Docker.connection, &block) body = connection.post( '/images/create', .merge('fromSrc' => '-'), :headers => { 'Content-Type' => 'application/tar', 'Transfer-Encoding' => 'chunked' }, &block ) new(connection, 'id'=> Docker::Util.parse_json(body)['status']) end |
.search(query = {}, connection = Docker.connection) ⇒ Object
Given a query like ‘{ :term => ’sshd’ }‘, queries the Docker Registry for a corresponding Image.
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# File 'lib/docker/image.rb', line 131 def search(query = {}, connection = Docker.connection) body = connection.get('/images/search', query) hashes = Docker::Util.parse_json(body) || [] hashes.map { |hash| new(connection, 'id' => hash['name']) } end |
Instance Method Details
#insert(query = {}) ⇒ Object
Insert a file into the Image, returns a new Image that has that file.
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# File 'lib/docker/image.rb', line 48 def insert(query = {}) body = connection.post(path_for(:insert), query) if id = Docker::Util.fix_json(body).last['status'] self.class.send(:new, connection, 'id' => id) else raise UnexpectedResponseError, "Could not find Id in '#{body}'" end end |
#insert_local(opts = {}) ⇒ Object
Given a path of a local file and the path it should be inserted, creates a new Image that has that file.
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# File 'lib/docker/image.rb', line 59 def insert_local(opts = {}) local_paths = opts.delete('localPath') output_path = opts.delete('outputPath') local_paths = [ local_paths ] unless local_paths.is_a?(Array) file_hash = Docker::Util.file_hash_from_paths(local_paths) file_hash['Dockerfile'] = dockerfile_for(file_hash, output_path) tar = Docker::Util.create_tar(file_hash) body = connection.post('/build', opts, :body => tar) self.class.send(:new, connection, 'id' => Docker::Util.extract_id(body)) end |
#push(creds = nil, options = {}) ⇒ Object
Push the Image to the Docker registry.
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# File 'lib/docker/image.rb', line 25 def push(creds = nil, = {}) repo_tag = info['RepoTags'].first raise ArgumentError "Image is untagged" if repo_tag.nil? repo, tag = Docker::Util.parse_repo_tag(repo_tag) raise ArgumentError, "Image does not have a name to push." if repo.nil? credentials = creds || Docker.creds || {} headers = Docker::Util.build_auth_header(credentials) opts = .merge(:tag => tag) connection.post("/images/#{repo}/push", opts, :headers => headers) self end |
#refresh! ⇒ Object
Update the @info hash, which is the only mutable state in this object.
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# File 'lib/docker/image.rb', line 95 def refresh! img = Docker::Image.all(:all => true).find { |image| image.id.start_with?(self.id) || self.id.start_with?(image.id) } info.merge!(self.json) img && info.merge!(img.info) self end |
#remove(opts = {}) ⇒ Object Also known as: delete
Remove the Image from the server.
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# File 'lib/docker/image.rb', line 75 def remove(opts = {}) connection.delete("/images/#{self.id}", opts) end |
#run(cmd = nil) ⇒ Object
Given a command and optional list of streams to attach to, run a command on an Image. This will not modify the Image, but rather create a new Container to run the Image. If the image has an embedded config, no command is necessary, but it will fail with 500 if no config is saved with the image
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# File 'lib/docker/image.rb', line 9 def run(cmd=nil) opts = { 'Image' => self.id } opts["Cmd"] = cmd.is_a?(String) ? cmd.split(/\s+/) : cmd begin Docker::Container.create(opts, connection) .tap(&:start!) rescue ServerError => ex if cmd raise ex else raise ServerError, "No command specified." end end end |
#tag(opts = {}) ⇒ Object
Tag the Image.
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# File 'lib/docker/image.rb', line 39 def tag(opts = {}) self.info['RepoTags'] ||= [] connection.post(path_for(:tag), opts) repo = opts['repo'] || opts[:repo] tag = opts['tag'] || opts[:tag] || 'latest' self.info['RepoTags'] << "#{repo}:#{tag}" end |
#to_s ⇒ Object
Return a String representation of the Image.
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# File 'lib/docker/image.rb', line 81 def to_s "Docker::Image { :id => #{self.id}, :info => #{self.info.inspect}, "\ ":connection => #{self.connection} }" end |