[bug#27374] [PATCH 2/3] gnu: Add python-lmdb.

[Tobias Geerinckx-Rice]

* gnu/packages/databases.scm (python-lmdb, python2-lmdb): New variables.
---
 gnu/packages/databases.scm | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/gnu/packages/databases.scm b/gnu/packages/databases.scm
index 3c9c29b4c..861b0c48a 100644
--- a/gnu/packages/databases.scm
+++ b/gnu/packages/databases.scm
@@ -1548,3 +1548,45 @@ file format to other databases such as MySQL, Oracle, 
Sybase, PostgreSQL,
 etc., and an SQL engine for performing simple SQL queries.")
     (license (list license:lgpl2.0
                    license:gpl2+))))
+
+(define-public python-lmdb
+  (package
+    (name "python-lmdb")
+    (version "0.92")
+    (source (origin
+              (method url-fetch)
+              (uri (pypi-uri "lmdb" version))
+              (sha256
+               (base32
+                "01nw6r08jkipx6v92kw49z34wmwikrpvc5j9xawdiyg1n2526wrx"))
+              (modules '((guix build utils)))
+              (snippet
+               ;; Delete bundled lmdb source files.
+               '(for-each delete-file (list "lib/lmdb.h"
+                                            "lib/mdb.c"
+                                            "lib/midl.c"
+                                            "lib/midl.h")))))
+    (build-system python-build-system)
+    (inputs
+     `(("lmdb" ,lmdb)))
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-before 'build 'use-system-lmdb
+           (lambda* (#:key inputs #:allow-other-keys)
+             (let ((lmdb (assoc-ref inputs "lmdb")))
+               (setenv "LMDB_FORCE_SYSTEM" "set")
+               (setenv "LMDB_INCLUDEDIR" (string-append lmdb "/include"))
+               (setenv "LMDB_LIBDIR" (string-append lmdb "/lib"))
+               #t))))
+       ;; Tests fail with: ‘lmdb.tool: Please specify environment (--env)’.
+       #:tests? #f))
+    (home-page "https://github.com/dw/py-lmdb";)
+    (synopsis "Python binding for the ‘Lightning’ database (LMDB)")
+    (description
+     "python-lmdb or py-lmdb is a Python binding for the @dfn{Lightning
+Memory-Mapped Database} (LMDB), a high-performance key-value store.")
+    (license license:openldap2.8)))
+
+(define-public python2-lmdb
+  (package-with-python2 python-lmdb))
-- 
2.12.2