;; -*- mode: scheme; -*-
;; This is an operating system configuration template for a "Docker image"
;; setup, so it has barely any services at all.

(use-modules (gnu))

(operating-system
  (host-name "komputilo")
  (timezone "Europe/Berlin")
  (locale "en_US.utf8")

  ;; This is where user accounts are specified.  The "root" account is
  ;; implicit, and is initially created with the empty password.
  (users (cons (user-account
                (name "alice")
                (comment "Bob's sister")
                (group "users")
                (supplementary-groups '("wheel"
                                        "audio" "video")))
               %base-user-accounts))

  ;; Globally-installed packages.
  (packages %base-packages)

  ;; Because the system will run in a Docker container, we may omit many
  ;; things that would normally be required in an operating system
  ;; configuration file.  These things include:
  ;;
  ;;   * bootloader
  ;;   * file-systems
  ;;   * services such as mingetty, udevd, slim, networking, dhcp
  ;;
  ;; Either these things are simply not required, or Docker provides
  ;; similar services for us.

  ;; This will be ignored.
  (bootloader (bootloader-configuration
               (bootloader grub-bootloader)
               (targets '("does-not-matter"))))
  ;; This will be ignored, too.
  (file-systems (list (file-system
                        (device "does-not-matter")
                        (mount-point "/")
                        (type "does-not-matter"))))

  ;; Guix is all you need!
  (services (list (service guix-service-type))))
d='get' action='/guix/log/tests/nar.scm'>
<input type='hidden' name='id' value='1590d6d58e4d1dcb482982a88c7eba70c41bc226'/><input type='hidden' name='showmsg' value='1'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=1590d6d58e4d1dcb482982a88c7eba70c41bc226&amp;showmsg=1'>root</a>/<a href='/guix/log/tests?id=1590d6d58e4d1dcb482982a88c7eba70c41bc226&amp;showmsg=1'>tests</a>/<a href='/guix/log/tests/nar.scm?id=1590d6d58e4d1dcb482982a88c7eba70c41bc226&amp;showmsg=1'>nar.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/nar.scm?id=1590d6d58e4d1dcb482982a88c7eba70c41bc226'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2021-11-16 14:34:28 +0100'>2021-11-16</span></td><td class='logsubject'><a href='/guix/commit/tests/nar.scm?id=472a0e82a52a3d5d841e1dfad6b13e26082a5750'>daemon: Do not deduplicate files smaller than 8 KiB.</a></td><td>Ludovic Courtès</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
Files smaller than 8 KiB typically represent ~70% of the entries in
/gnu/store/.links but only contribute to ~4% of the space savings
afforded by deduplication.

Not considering these files for deduplication speeds up file insertion
in the store and, more importantly, leaves 'removeUnusedLinks' with
fewer entries to traverse, thereby speeding it up proportionally.

Partly fixes &lt;https://issues.guix.gnu.org/24937&gt;.

* config-daemon.ac: Remove symlink hard link check and CAN_LINK_SYMLINK
definition.
* guix/store/deduplication.scm (%deduplication-minimum-size): New
variable.
(deduplicate)[loop]: Do not recurse when FILE's size is below
%DEDUPLICATION-MINIMUM-SIZE.
(dump-port): New procedure.
(dump-file/deduplicate)[hash]: Turn into...
[dump-and-compute-hash]: ... this thunk.
Call 'deduplicate' only when SIZE is greater than
%DEDUPLICATION-MINIMUM-SIZE; otherwise call 'dump-port'.
* nix/libstore/gc.cc (LocalStore::removeUnusedLinks): Drop files where
st.st_size &lt; deduplicationMinSize.
* nix/libstore/local-store.hh (deduplicationMinSize): New declaration.
* nix/libstore/optimise-store.cc (deduplicationMinSize): New variable.
(LocalStore::optimisePath_): Return when PATH is a symlink or smaller
than 'deduplicationMinSize'.
* tests/derivations.scm ("identical files are deduplicated"): Produce
files bigger than %DEDUPLICATION-MINIMUM-SIZE.
* tests/nar.scm ("restore-file-set with directories (signed, valid)"):
Likewise.
* tests/store-deduplication.scm ("deduplicate, below %deduplication-minimum-size"):
New test.
("deduplicate", "deduplicate, ENOSPC"): Produce files bigger than
%DEDUPLICATION-MINIMUM-SIZE.
* tests/store.scm ("substitute, deduplication"): Likewise.


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