Fernando J. Pereda’s blag

September 15, 2008

iPhoto movies in FrontRow

Filed under: blag — Tags: , , , — Fernando J. Pereda @ 5:33 pm

Ok, so we all know that Apple makes software, and that its software is sometimes full of fail:

Even if their software usually integrates nicely, it really irritates me that some details are completely left out. For instance, iPhoto will import and manage movies from a digital camera. Then, when you are going to show the photos to the family with, for instance, FrontRow, the movies won’t come up. They’ll be ignored in the ‘Photos’ tab, and nothing will show up on the ‘Movies’ tab either.

Oh well, bash comes to the rescue:

	local DEST="${HOME}/Movies/iPhoto Movies/" d
	rm -rf "${DEST}"
	mkdir "${DEST}"
	find "${HOME}/Pictures/iPhoto Library/Originals/" \
		-iname '*.avi' -or -iname '*.mov' | while read f ; do
		mkdir "${d}" 2>/dev/null
		ln "${f}" "${d}"

I just hate to have to do this by hand.

— ferdy

June 11, 2008

How I migrated Paludis to Git

Filed under: blag — Tags: , , — Fernando J. Pereda @ 7:41 pm

Paludis has been using (and it currently still uses) Subversion to manage its source. We’ve been using git-svn for some months now and recently ciaranm agreed to fully migrate to Git.

To migrate the repository I used my old git-svn clone. This made some stuff a bit trickier, but it was both faster and nicer with pioto‘s server. Things that had to be done:

  • Remove ChangeLog and ChangeLog.old.bz2
  • Remove metadata added by git-svn
  • Rewrite authors and emails since I didn’t use an authors-file
  • Remove empty commits (these are commits that only touched ChangeLog or ChangeLog.old.bz2)

This looks like a good task for git-filter-branch. I probably could have done everything in one go, but I decided to do it one at a time.

Since filter-branch is mostly IO-bound, we’ll try to speed it up as much as possible:

$ sudo mount -t tmpfs -o size=100M none paludis/.git-rewrite
$ myrefs="0.4 0.6 0.8 0.20 0.24 0.26 ....."

The first task is easy:

$ git filter-branch -f --tree-filter 'git update-index --remove ChangeLog' $myrefs
$ git filter-branch -f --tree-filter 'git update-index --remove ChangeLog.old.bz2' $myrefs

To remove metadata created by git-svn I came up with:

tac | sed -n -e '1d' -e '/[^[:blank:]]/,$p' | tac

but dleverton came up with this perl one-liner, and I used it instead:

perl -ne 'print @blanks, $last and undef @blanks if defined $last; if (m/\S/) { $last = $_ } else { undef $last; push(@blanks, $_) }'

I put it in a file and ran:

git filter-branch -f --msg-filter ~/munge-commit-message $myrefs

Changing authors needed a script like the following (with proper mail-addresses):

case ${GIT_AUTHOR_NAME} in
        ciaranm)   n="Ciaran McCreesh"      ; m="foo@bar.com" ;;
        spb)       n="Stephen P. Bennett"   ; m="foo@bar.com" ;;
        halcyon)   n="Mark Loeser"          ; m="foo@bar.com" ;;
        allanonjl) n="John N. Laliberte"    ; m="foo@bar.com" ;;
        steev)     n="Stephen Klimaszewski" ; m="foo@bar.com" ;;
        kugelfang) n="Danny van Dyk"        ; m="foo@bar.com" ;;
        ferdy)     n="Fernando J. Pereda"   ; m="foo@bar.com" ;;
        arachnist) n="Robert S. Gerus"      ; m="foo@bar.com" ;;
        drizzt)    n="Timothy Redaelli"     ; m="foo@bar.com" ;;
        djm)       n="David Morgan"         ; m="foo@bar.com" ;;
        pioto)     n="Mike Kelly"           ; m="foo@bar.com" ;;
        piotr)     n="Piotr Rak"            ; m="foo@bar.com" ;;
        rbrown)    n="Richard Brown"        ; m="foo@bar.com" ;;
        baptux)    n="Baptiste Daroussin"   ; m="foo@bar.com" ;;
        eroyf)     n="Alexander Færøy"      ; m="foo@bar.com" ;;
        compnerd)  n="Saleem Abdulrasool"   ; m="foo@bar.com" ;;
        omp)       n="David Shakaryan"      ; m="foo@bar.com" ;;
        dleverton) n="David Leverton"       ; m="foo@bar.com" ;;
        peper)     n="Piotr Jaroszyński"    ; m="foo@bar.com" ;;
        dev-zero)  n="Tiziano Müller"       ; m="foo@bar.com" ;;
        zlin)      n="Bo Ørsted Andresen"   ; m="foo@bar.com" ;;
        buildtest) n="Nightly Buildtest"    ; m="foo@bar.com" ;;
        flameeyes) n="Diego Pettenò"        ; m="foo@bar.com" ;;
        iluxa)     n="Ilya Volynets"        ; m="foo@bar.com" ;;
        dercorny)  n="Stefan Cornelius"     ; m="foo@bar.com" ;;


git commit-tree "$@"

and ran:

$ git filter-branch -f --commit-filter ~/rewrite-authors $myrefs

Removing empty commits requires a bit more foo:

        while [[ -n $1 ]] ; do
                map "$1"

our_parent_tree=$(map $3)

if [[ -z ${our_parent_tree} ]] || [[ -n $(git diff-tree ${our_tree} ${our_parent_tree}:) ]] ; then
        git commit-tree "$@"
        skip_commit "$@"

This one could have just tested whether the current tree is the same as our parent’s tree (that is, no changes were made by this commit):

[[ ${our_tree} == $(git rev-parse $(map $3):) ]]

But it wouldn’t have made a big difference and I noticed it while filter branch was already running something like:

$ git filter-branch -f --commit-filter '. ~/empty-commits.bash' $myrefs

There’s still stuff to do like tags and adding scratch and probably converting the overlay; but the big thing is done. I think that history is stable already, that is, I won’t have to rewrite it again.

It is sitting in my home in bach and will be published soon.

Update: Re-tagging every paludis was the last step. I thought it was going to be cumbersome and boring, however, git makes this kind of stuff pretty easy. Since ciaranm should sign the tags himself, I did:

$ git log --pretty=oneline origin/releases |
> sed -n -e '/^\([0-9a-f]\{40\}\) Tag\( release\)\? \(.*\)/s--\3|\1|Tag release \3-p' \
> > ~/paludis-git-tags

After some hand editing of the file, creating the tags can be done with something like:

$ while read name msg head ; do
> git tag -m "${msg}" ${name} ${head} ;
> done < paludis-git-tags

To checkout an exact version (assuming ~/git/paludis is your repo, doesn’t have to be a local repo):

$ cd somewhere
$ git archive --format=tar --remote=~/git/paludis --prefix=paludis- 0.4.0 0.4.0 | tar xf -

— ferdy

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