bug#19757: [PATCH] gc: ignore trailing slash or subdirectories for `guix gc -d'

[Cyrill Schenkel <cyrill.schenkel@gmail.com>]

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From 7385c2ddd4ca50cb80afcd315287eaadff4d8421 Mon Sep 17 00:00:00 2001
From: Cyrill Schenkel <cyrill.schenkel@gmail.com>
Date: Sun, 24 May 2015 13:46:37 +0200
Subject: [PATCH] gc: ignore trailing slash or subdirectories for `guix gc -d'

Fixes <http://bugs.gnu.org/19757>.

* guix/scripts/gc.scm (guix-gc): Convert paths to direct store paths.
* guix/store.scm (direct-store-path): Get rid of subdirectories in store path.
* tests/guix-gc.sh: New tests.
---
 guix/scripts/gc.scm |  2 +-
 guix/store.scm      |  7 +++++++
 tests/guix-gc.sh    | 20 ++++++++++++++++++++
 3 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/guix/scripts/gc.scm b/guix/scripts/gc.scm
index 4bae65a..a250cdc 100644
--- a/guix/scripts/gc.scm
+++ b/guix/scripts/gc.scm
@@ -168,7 +168,7 @@ Invoke the garbage collector.\n"))
                (collect-garbage store min-freed)
                (collect-garbage store))))
         ((delete)
-         (delete-paths store paths))
+         (delete-paths store (map direct-store-path paths)))
         ((list-references)
          (list-relatives references))
         ((list-requisites)
diff --git a/guix/store.scm b/guix/store.scm
index fc2f8d9..98b293b 100644
--- a/guix/store.scm
+++ b/guix/store.scm
@@ -121,6 +121,7 @@
             derivation-path?
             store-path-package-name
             store-path-hash-part
+            direct-store-path
             log-file))
 
 (define %protocol-version #x10c)
@@ -1038,6 +1039,12 @@ syntactically valid store path."
     (and=> (regexp-exec path-rx path)
            (cut match:substring <> 1))))
 
+(define (direct-store-path path)
+  "Return the direct store path part of PATH."
+  (let* ((minimal-prefix-length (+ (string-length (%store-prefix)) 35))
+         (slash-index (string-index path #\/ minimal-prefix-length)))
+    (if slash-index (string-take path slash-index) path)))
+
 (define (log-file store file)
   "Return the build log file for FILE, or #f if none could be found.  FILE
 must be an absolute store file name, or a derivation file name."
diff --git a/tests/guix-gc.sh b/tests/guix-gc.sh
index eac9d82..c1eb66c 100644
--- a/tests/guix-gc.sh
+++ b/tests/guix-gc.sh
@@ -64,3 +64,23 @@ guix gc -C 1KiB
 # Check trivial error cases.
 if guix gc --delete /dev/null;
 then false; else true; fi
+
+# Bug #19757
+out="`guix build guile-bootstrap`"
+test -d "$out"
+
+guix gc --delete "$out"
+
+! test -d "$out"
+
+out="`guix build guile-bootstrap`"
+test -d "$out"
+
+guix gc --delete "$out/"
+
+! test -d "$out"
+
+out="`guix build guile-bootstrap`"
+test -d "$out"
+
+guix gc --delete "$out/bin/guile"
-- 
2.1.4