GNU bug report logs - #75810
[PATCH 0/6] Rootless guix-daemon

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From: Ludovic Courtès <ludo <at> gnu.org>
To: 75810 <at> debbugs.gnu.org
Cc: Ludovic Courtès <ludo <at> gnu.org>
Subject: [bug#75810] [PATCH v2 8/9] etc: systemd services: Run ‘guix-daemon’ as an unprivileged user.
Date: Thu, 13 Feb 2025 13:13:11 +0100

* etc/guix-daemon.service.in (ExecStart): Remove ‘--build-users-group’.
(User, AmbientCapabilities): New fields.

Change-Id: Id826b8ab535844b6024d777f6bd15fd49db6d65e
---
 etc/guix-daemon.service.in | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/etc/guix-daemon.service.in b/etc/guix-daemon.service.in
index 5c43d9b7f1b..f9f0b28b356 100644
--- a/etc/guix-daemon.service.in
+++ b/etc/guix-daemon.service.in
@@ -7,9 +7,19 @@ Description=Build daemon for GNU Guix
 
 [Service]
 ExecStart=@localstatedir@/guix/profiles/per-user/root/current-guix/bin/guix-daemon \
-    --build-users-group=guixbuild --discover=no \
+    --discover=no \
     --substitute-urls='@GUIX_SUBSTITUTE_URLS@'
 Environment='GUIX_LOCPATH=@localstatedir@/guix/profiles/per-user/root/guix-profile/lib/locale' LC_ALL=en_US.utf8
+
+# Run under a dedicated unprivileged user account.
+User=guix-daemon
+
+# Provide the CAP_CHOWN capability so that guix-daemon cran create and chown
+# /var/guix/profiles/per-user/$USER and also chown failed build directories
+# when using '--keep-failed'.  Note that guix-daemon explicitly drops ambient
+# capabilities before executing build processes so they don't inherit them.
+AmbientCapabilities=CAP_CHOWN
+
 StandardOutput=journal
 StandardError=journal
 
-- 
2.48.1

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