[bug#40738] [PATCH 1/4] gnu: Add prometheus.

[Christopher Baines]

* gnu/packages/monitoring.scm (prometheus): New variable.
---
 gnu/packages/monitoring.scm | 49 +++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/gnu/packages/monitoring.scm b/gnu/packages/monitoring.scm
index 8da31d6a84..345c2c16c5 100644
--- a/gnu/packages/monitoring.scm
+++ b/gnu/packages/monitoring.scm
@@ -422,6 +422,55 @@ written in Go with pluggable metric collectors.")
     (home-page "https://github.com/prometheus/node_exporter";)
     (license license:asl2.0)))
 
+(define-public prometheus
+  (package
+    (name "prometheus")
+    (version "2.17.1")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/prometheus/prometheus.git";)
+                    (commit (string-append "v" version))))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "1r7zpq6647lrm7cmid6nnf2xnljqh1i9g0fxvs0qrfd2sxxgj0c7"))))
+    (build-system go-build-system)
+    (arguments
+     '(#:unpack-path "github.com/prometheus/prometheus"
+       #:import-path "github.com/prometheus/prometheus/cmd/prometheus"
+       #:install-source? #f
+       #:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'patch
+           (lambda* (#:key outputs #:allow-other-keys)
+             (let* ((out (assoc-ref outputs "out"))
+                    (assets-prefix
+                     (string-append out "/var/lib/prometheus/assets")))
+               (substitute* "src/github.com/prometheus/prometheus/web/ui/ui.go"
+                 (("var assetsPrefix string")
+                  (string-append "var assetsPrefix string = \""
+                                 assets-prefix
+                                 "\""))))
+             #t))
+         (add-after 'install 'install-assets
+           (lambda* (#:key outputs #:allow-other-keys)
+             (let* ((out (assoc-ref outputs "out"))
+                    (assets-prefix
+                     (string-append out "/var/lib/prometheus/assets")))
+               (for-each (lambda (directory)
+                           (copy-recursively
+                            (string-append 
"src/github.com/prometheus/prometheus"
+                                           "/web/ui/" directory)
+                            (string-append assets-prefix
+                                           "/" directory)))
+                         '("static" "templates")))
+             #t)))))
+    (home-page "https://prometheus.io/";)
+    (synopsis "")
+    (description "")
+    (license "")))
+
 (define-public fswatch
   (package
     (name "fswatch")
-- 
2.26.0