{"id":976,"date":"2012-05-10T15:50:58","date_gmt":"2012-05-10T14:50:58","guid":{"rendered":"http:\/\/cyberelk.net\/tim\/?p=976"},"modified":"2014-10-21T00:01:04","modified_gmt":"2014-10-20T23:01:04","slug":"announcing-printerd","status":"publish","type":"post","link":"https:\/\/cyberelk.net\/tim\/2012\/05\/10\/announcing-printerd\/","title":{"rendered":"Announcing printerd"},"content":{"rendered":"<p>For the last few weeks I&#8217;ve been working on an experimental new print spooler called <a href=\"http:\/\/gitorious.org\/printerd\" target=\"_blank\">printerd<\/a>. It was designed in collaboration with <a href=\"http:\/\/blogs.gnome.org\/hughsie\/\" target=\"_blank\">Richard Hughes<\/a> and it aims to be a modern print spooler for Linux.<\/p>\n<p>It is a polkit-enabled D-Bus system service, written using the GLib object system. Although modelled on concepts from IPP (Internet Printing Protocol), printerd is not in itself an IPP server. Its only interface is D-Bus, although the aim is to be able to implement an IPP server on top of the D-Bus API as a separate process. Having a D-Bus interface means that applications wanting to print automatically get to use printerd asynchronously.<\/p>\n<p>As a design decision, the range of input formats accepted by printerd will be very limited: essentially only PDF. The existing CUPS drivers and backends will be compatible with printerd.<\/p>\n<p>There isn&#8217;t much written yet aside from the basic framework and a very simple command line tool.<\/p>\n<p>Feel free to take a look around: <a href=\"http:\/\/github.com\/hughsie\/printerd\" target=\"_blank\">http:\/\/github.com\/hughsie\/printerd<\/a><\/p>\n<p><!--more--><\/p>\n<p><a href=\"https:\/\/cyberelk.net\/tim\/wp-content\/uploads\/2012\/05\/dfeet.png\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"977\" data-permalink=\"https:\/\/cyberelk.net\/tim\/2012\/05\/10\/announcing-printerd\/dfeet\/\" data-orig-file=\"https:\/\/cyberelk.net\/tim\/wp-content\/uploads\/2012\/05\/dfeet.png\" data-orig-size=\"666,1512\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;}\" data-image-title=\"dfeet\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/cyberelk.net\/tim\/wp-content\/uploads\/2012\/05\/dfeet-451x1024.png\" class=\"alignnone size-large wp-image-977\" title=\"dfeet\" src=\"https:\/\/cyberelk.net\/tim\/wp-content\/uploads\/2012\/05\/dfeet-451x1024.png\" alt=\"\" width=\"451\" height=\"1024\" srcset=\"https:\/\/cyberelk.net\/tim\/wp-content\/uploads\/2012\/05\/dfeet-451x1024.png 451w, https:\/\/cyberelk.net\/tim\/wp-content\/uploads\/2012\/05\/dfeet-198x450.png 198w, https:\/\/cyberelk.net\/tim\/wp-content\/uploads\/2012\/05\/dfeet.png 666w\" sizes=\"auto, (max-width: 451px) 100vw, 451px\" \/><\/a><\/p>\n<pre>$ pd-client -v print-files myprinter ~\/Documents\/portrait-a4.pdf\r\nTI:15:09:58\u00a0\u00a0 \u00a0getting printerd manager\r\nTI:15:09:58\u00a0\u00a0 \u00a0Getting printer \/org\/freedesktop\/printerd\/printer\/myprinter\r\nTI:15:09:58\u00a0\u00a0 \u00a0Job created: \/org\/freedesktop\/printerd\/job\/1\r\nTI:15:09:58\u00a0\u00a0 \u00a0Document added\r\nTI:15:09:58\u00a0\u00a0 \u00a0Job started\r\nJob path is \/org\/freedesktop\/printerd\/job\/1\r\n\r\n# printerd -v\r\nTI:15:02:46\u00a0\u00a0 \u00a0Entering main event loop\r\nTI:15:02:46\u00a0\u00a0 \u00a0add device usb:\/\/HP\/DESKJET%20990C?serial=US05N1J00XLG [...]\r\nTI:15:02:46\u00a0\u00a0 \u00a0Connected to the system bus\r\nTI:15:02:46\u00a0\u00a0 \u00a0Acquired the name org.freedesktop.printerd on the system message bus\r\nTI:15:08:52\u00a0\u00a0 \u00a0Handling GetDevices\r\nTI:15:08:57\u00a0\u00a0 \u00a0Handling GetDevices\r\nTI:15:09:12\u00a0\u00a0 \u00a0Checking authorization of :1.642 for org.freedesktop.printerd.printer-add\r\nTI:15:09:12\u00a0\u00a0 \u00a0Authorized\r\nTI:15:09:12\u00a0\u00a0 \u00a0Creating printer from device HEWLETT_PACKARD_DESKJET_990C_US05N1J00XLG\r\nTI:15:09:12\u00a0\u00a0 \u00a0add printer myprinter\r\nTI:15:09:58\u00a0\u00a0 \u00a0Checking authorization of :1.647 for org.freedesktop.printerd.job-add\r\nTI:15:09:58\u00a0\u00a0 \u00a0Authorized\r\nTI:15:09:58\u00a0\u00a0 \u00a0Creating job for printer myprinter\r\nTI:15:09:58\u00a0\u00a0 \u00a0New job path is \/org\/freedesktop\/printerd\/job\/1\r\nTI:15:09:58\u00a0\u00a0 \u00a0Created job path is \/org\/freedesktop\/printerd\/job\/1\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Adding document\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Got file descriptor: 10\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Starting job\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Spooling\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1]\u00a0\u00a0 Created temporary file \/tmp\/printerd-spool-AHFWDW\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] \u00a0 Set job state to pending\r\nTI:15:09:58\u00a0\u00a0 \u00a0Job 1 changed state: pending\r\nTI:15:09:58\u00a0\u00a0 \u00a0Printer for job 1 idle so starting job\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Starting to process job\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Using device URI usb:\/\/HP\/DESKJET%20990C?serial=US05N1J00XLG\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Executing \/usr\/lib\/cups\/backend\/usb\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1]\u00a0 Env: DEVICE_URI=usb:\/\/HP\/DESKJET%20990C?serial=US05N1J00XLG\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1]\u00a0 Arg: usb:\/\/HP\/DESKJET%20990C?serial=US05N1J00XLG\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1]\u00a0 Arg: 1\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1]\u00a0 Arg: :1.647\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1]\u00a0 Arg: job 1\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1]\u00a0 Arg: 1\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1]\u00a0 Arg:\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Read 1024 bytes from spool file\r\nTI:15:09:58\u00a0\u00a0 \u00a0Job 1 changed state: processing\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Wrote 1024 bytes to backend\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Read 1024 bytes from spool file\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Wrote 1024 bytes to backend\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Read 1024 bytes from spool file\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Wrote 1024 bytes to backend\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Read 1024 bytes from spool file\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Wrote 1024 bytes to backend\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Read 1024 bytes from spool file\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Wrote 1024 bytes to backend\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Read 1024 bytes from spool file\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Wrote 1024 bytes to backend\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Read 1024 bytes from spool file\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Wrote 1024 bytes to backend\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Read 1024 bytes from spool file\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Wrote 1024 bytes to backend\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Read 564 bytes from spool file\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Wrote 564 bytes to backend\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] Spool finished\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] backend: STATE: +connecting-to-device\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] backend: DEBUG: Printer using device file \"\/dev\/usb\/lp0\"...\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] backend: STATE: -connecting-to-device\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] backend: DEBUG: backendRunLoop(print_fd=0, device_fd=3, snmp_fd=-1, addr=(nil), use_bc=1, side_cb=0x7f053adc6c30)\r\nTI:15:09:58\u00a0\u00a0 \u00a0[Job 1] backend: DEBUG: Read 8192 bytes of print data...<\/pre>\n<p>UPDATE: Fixed URL as the project has moved to github.com.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>For the last few weeks I&#8217;ve been working on an experimental new print spooler called printerd. It was designed in collaboration with Richard Hughes and it aims to be a modern print spooler for Linux. It is a polkit-enabled D-Bus system service, written using the GLib object system. Although modelled on concepts from IPP (Internet [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[3],"tags":[53,77,28],"class_list":["post-976","post","type-post","status-publish","format-standard","hentry","category-software","tag-git","tag-printerd","tag-printing"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Announcing printerd - PRINT HEAD<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cyberelk.net\/tim\/2012\/05\/10\/announcing-printerd\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Announcing printerd - PRINT HEAD\" \/>\n<meta property=\"og:description\" content=\"For the last few weeks I&#8217;ve been working on an experimental new print spooler called printerd. It was designed in collaboration with Richard Hughes and it aims to be a modern print spooler for Linux. It is a polkit-enabled D-Bus system service, written using the GLib object system. Although modelled on concepts from IPP (Internet [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/cyberelk.net\/tim\/2012\/05\/10\/announcing-printerd\/\" \/>\n<meta property=\"og:site_name\" content=\"PRINT HEAD\" \/>\n<meta property=\"article:published_time\" content=\"2012-05-10T14:50:58+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2014-10-20T23:01:04+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/cyberelk.net\/tim\/wp-content\/uploads\/2012\/05\/dfeet-451x1024.png\" \/>\n<meta name=\"author\" content=\"Tim Waugh\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Tim Waugh\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/cyberelk.net\\\/tim\\\/2012\\\/05\\\/10\\\/announcing-printerd\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/cyberelk.net\\\/tim\\\/2012\\\/05\\\/10\\\/announcing-printerd\\\/\"},\"author\":{\"name\":\"Tim Waugh\",\"@id\":\"https:\\\/\\\/cyberelk.net\\\/tim\\\/#\\\/schema\\\/person\\\/23b749f30a67f1b1c6af17024fc94bf6\"},\"headline\":\"Announcing printerd\",\"datePublished\":\"2012-05-10T14:50:58+00:00\",\"dateModified\":\"2014-10-20T23:01:04+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/cyberelk.net\\\/tim\\\/2012\\\/05\\\/10\\\/announcing-printerd\\\/\"},\"wordCount\":180,\"publisher\":{\"@id\":\"https:\\\/\\\/cyberelk.net\\\/tim\\\/#\\\/schema\\\/person\\\/23b749f30a67f1b1c6af17024fc94bf6\"},\"image\":{\"@id\":\"https:\\\/\\\/cyberelk.net\\\/tim\\\/2012\\\/05\\\/10\\\/announcing-printerd\\\/#primaryimage\"},\"thumbnailUrl\":\"http:\\\/\\\/cyberelk.net\\\/tim\\\/wp-content\\\/uploads\\\/2012\\\/05\\\/dfeet-451x1024.png\",\"keywords\":[\"git\",\"printerd\",\"printing\"],\"articleSection\":[\"Software\"],\"inLanguage\":\"en-GB\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/cyberelk.net\\\/tim\\\/2012\\\/05\\\/10\\\/announcing-printerd\\\/\",\"url\":\"https:\\\/\\\/cyberelk.net\\\/tim\\\/2012\\\/05\\\/10\\\/announcing-printerd\\\/\",\"name\":\"Announcing printerd - 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