doc/forum/How_does_ikiwiki_remember_times__63__.mdwn



This is similar to the last post in this forum. I want to know exactly how ikiwiki remembers the times associated with pages, especially when using it for blogging, so I know whether I can trust it or not. From that last thread, I think what ikiwiki does is this:


The created time of a file is when that file was first committed into the versioning repository (in my case git)

If --getctime it used, yes. In normal operation, when new files
are added, ikiwiki sets the creation time to the ctime of the file
on disk, rather than bothering to ask the VCS. --[[Joey]]


The modified time of a file is what that file was last updated in the repository

Almost right, the modified time is actually taken from the
modification time of the file in disk. --[[Joey]]


And with a blog, by default, the posts are ordered by creation time, although an option can order them by modified time.
Okay. So this should mean that the times are safe if, for example, I delete my working copy and then clone another one from the bare git repository, or otherwise mess up the creation times and mtimes stored as file metadata on the filesystem.
Do I have it right?

Some VCS, like git, set the file mtimes to the current time
when making a new checkout, so they will be lost if you do that.
The creation times can be retrived using the --getctime option.
I suppose it might be nice if there were a --getmtime that pulled
true modification times out of the VCS, but I haven't found it a big
deal in practice for the last modification times to be updated to the
current time when rebuilding a wiki like this. --[[Joey]]

Thanks for the clarification. I ran some tests of my own to make sure I understand it right, and I'm satisfied
that the order of posts in my blog can be retrieved from the VCS using the --getctime option, at least if I
choose to order my posts by creation time rather than modification time. But I now know that I can't rely on
page modification times in ikiwiki as these can be lost permanently.
I would suggest that there should at least be a --getmtime option like you describe, and perhaps that
--getctime and --getmtime be on by default. In my opinion the creation times and modification times of
pages in ikiwiki are part of the user's content and are important to protect, because the user may be relying
on them, especially if they use blogging or lists of recently modified pages, etc. Right now the modification
times can be lost permanently.
Is there a typo in the description of --getctime in the man page?

--getctime
Pull  last  changed  time  for each new page out of the revision
control system. This rarely used option provides a  way  to  get
the real creation times of items in weblogs, such as when build‐
ing a wiki from a new Subversion checkout. It is unoptimised and
quite  slow. It is best used with --rebuild, to force ikiwiki to
get the ctime for all pages.

Surely it is not the last changed time but the first seen time of each page that is pulled out of the VCS?
If the aim is to get the real creation times of items in weblogs, then the last times that the items were
changed in the VCS is not going to help. -- [[seanh]]

Typo, fixed. --[[Joey]]


If you want to preserve the date of a page, the best way to do it is to
use [[ikiwiki/directive/meta]] date="foo". This will survive checkouts,
VCS migrations, etc. -- [[Jon]]

That's a good tip Jon. That would also survive renaming a page by renaming its mdwn file, which would
normally lose the times also. (And in that case I think both times are irretrievable, even by
--getctime). I might start using a simple script to make blog posts that creates a file for
me, puts today's date in the file as a meta, and opens the file in my editor.  -- [[seanh]]


I use a script that does that and also sets up templates and tags
for a new item:


#!/bin/sh
set -u
set -e

if [ $# -ne 1 ]; then
    echo usage: $0 pagename >&2
    exit 1
fi

pagename="$1"

if [ -e "$pagename" ]; then
    echo error: "$pagename" exists >&2
        exit 1
fi

date=$(date)
echo '\[[!template id=draft]]' >> "$pagename"
echo "\[[!meta date=\"$date\"]]" >> "$pagename"
echo "\[[!tag draft]]" >> "$pagename"
git add "$pagename"
$EDITOR "$pagename"


-- [[Jon]]


A quick workaround for me to get modification times right is the following
little zsh script, which unfortunately only works for git:

#!/usr/bin/env zsh

set +x

for FILE in **/*(.); do
  TIMES="`git log --pretty=format:%ai $FILE`"
  MTIME="`echo $TIMES | head -n1`"

  if [ ! -z $MTIME ]; then
    echo  touch -m -d "$MTIME" $FILE
    touch -m -d "$MTIME" $FILE
  fi

done


--[[David_Riebenbauer]]