bug#26770: [PATCH] gnu: tailon: Use absolute paths for commands.

[Christopher Baines]

* gnu/packages/logging.scm (tailon)[arguments]: Patch commands.py to reference
  grep, awk, sed and tail by absolute paths.
---
 gnu/packages/logging.scm | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/gnu/packages/logging.scm b/gnu/packages/logging.scm
index 2523d65f6..11bbfef52 100644
--- a/gnu/packages/logging.scm
+++ b/gnu/packages/logging.scm
@@ -109,6 +109,22 @@ command line.")
      `(("python-pyyaml" ,python-pyyaml)
        ("python-sockjs-tornado" ,python-sockjs-tornado)
        ("python-tornado" ,python-tornado)))
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-after 'install 'wrap-tailon-path
+                    (lambda* (#:key inputs outputs #:allow-other-keys)
+                      (let ((out (assoc-ref outputs "out")))
+                        (substitute* (find-files out "commands.py")
+                          (("self\\.first_in_path\\('grep'\\)")
+                           (string-append"'" (which "grep") "'"))
+                          (("self\\.first_in_path\\('gawk', 'awk'\\)")
+                           (string-append"'" (which "gawk") "'"))
+                          (("self\\.first_in_path\\('gsed', 'sed'\\)")
+                           (string-append"'" (which "sed") "'"))
+                          (("self\\.first_in_path\\('gtail', 'tail'\\)")
+                           (string-append"'" (which "tail") "'")))
+                        #t))))))
     (home-page "https://tailon.readthedocs.io/";)
     (synopsis
      "Webapp for looking at and searching through log files")
-- 
2.12.0