Hello, I would like to propose the attached patch for the `cups-filters` package. The point is to add the paths for `coreutils` and `sed` to the PATH setting in the wrapper scripts so that the filters can find them. Maybe other packages should be added, at least this patch fixes the issue I was facing.
About my specific case: I want to use the printing service of my university, an instance of PaperCut. This is as simple as setting an LPD queue at the right address with the PPD printer driver provided by the university (a Ricoh IM C5500 PS in my case, if that makes any difference). After switching to Guix system a few months ago, this stopped working: print jobs were sent with no error message but they all appeared as 1 page in PaperCut and nothing actually came out of the printers. I finally took the time to explore the logs and it appears that CUPS at some point calls `foomatic-rip` and that this filter fails, as shown in these extracts from `/var/log/cups/error_log`: ``` I [18/Jul/2023:16:34:10 +0200] [Job 12] Started filter /gnu/store/nhjpc32034v6186v37l51j0z2jq8xlkm-cups-server-bin/lib/cups/filter/foomatic-rip (PID 27451) [...] D [18/Jul/2023:16:34:21 +0200] [Job 12] Starting process \"renderer\" (generation 2) D [18/Jul/2023:16:34:21 +0200] [Job 12] JCL: \033%-12345X@PJL D [18/Jul/2023:16:34:21 +0200] [Job 12] <job data> D [18/Jul/2023:16:34:21 +0200] [Job 12] /gnu/store/rib9g2ig1xf3kclyl076w28parmncg4k-bash-minimal-5.1.16/bin/bash: line 5: date: command not found D [18/Jul/2023:16:34:21 +0200] [Job 12] /gnu/store/rib9g2ig1xf3kclyl076w28parmncg4k-bash-minimal-5.1.16/bin/bash: line 5: sed: command not found D [18/Jul/2023:16:34:21 +0200] [Job 12] /gnu/store/rib9g2ig1xf3kclyl076w28parmncg4k-bash-minimal-5.1.16/bin/bash: line 5: date: command not found D [18/Jul/2023:16:34:21 +0200] [Job 12] /gnu/store/rib9g2ig1xf3kclyl076w28parmncg4k-bash-minimal-5.1.16/bin/bash: line 5: sed: command not found D [18/Jul/2023:16:34:21 +0200] [Job 12] /gnu/store/rib9g2ig1xf3kclyl076w28parmncg4k-bash-minimal-5.1.16/bin/bash: line 5: cat: command not found D [18/Jul/2023:16:34:21 +0200] [Job 12] renderer exited with status 127 D [18/Jul/2023:16:34:21 +0200] [Job 12] Process is dying with \"Encountered error Broken pipe during fwrite\", exit stat 1 [...] D [18/Jul/2023:16:34:21 +0200] [Job 12] PID 27451 (/gnu/store/nhjpc32034v6186v37l51j0z2jq8xlkm-cups-server-bin/lib/cups/filter/foomatic-rip) stopped with status 1. ``` So `foomatic-rip` actually needs `date`, `sed` and `cat` but does not find them. The issue with required tools is known in Guix because the package definition for `cups-filters` already adds paths for `ghostscript-with-cups` and `grep`. The patch just adds necessary inputs for those, and it makes printing work for me. I don't know what other tools the filters might require in other situations. On a different level, I am surprised that the failure above does not lead to an actual user-visible error by CUPS. A corrupted job is actually sent silently (probably with some error messages mixed with the printing job or with malformed printing commands) although the filter does return an error code. Maybe this should be sent upstream as a CUPS bug? -- Emmanuel
diff --git a/gnu/packages/cups.scm b/gnu/packages/cups.scm index 9d81a0aa07..301fdcdb35 100644 --- a/gnu/packages/cups.scm +++ b/gnu/packages/cups.scm @@ -198,9 +198,11 @@ (define-public cups-filters (wrap-program file `("PATH" ":" prefix (,(string-append + #$(this-package-input "coreutils") "/bin:" #$(this-package-input "ghostscript-with-cups") "/bin:" - #$(this-package-input "grep") "/bin"))))) + #$(this-package-input "grep") "/bin:" + #$(this-package-input "sed") "/bin"))))) (find-files (string-append #$output "/lib/cups/filter")))))))) (native-inputs @@ -208,6 +210,7 @@ (define-public cups-filters pkg-config)) (inputs (list avahi + coreutils fontconfig freetype font-dejavu ; also needed by test suite @@ -222,6 +225,7 @@ (define-public cups-filters glib qpdf poppler + sed cups-minimal)) (home-page "https://wiki.linuxfoundation.org/openprinting/cups-filters") (synopsis "OpenPrinting CUPS filters and backends")