mirrors/git-annex
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages 1 Wiki Activity Actions

assistant: generate better commits for renames

Browse source
This commit is contained in:
Joey Hess 2013-03-10 21:36:13 -04:00
parent b2c7ee5551
commit 2762ab03b4
9 changed files with 130 additions and 68 deletions
Download patch file Download diff file Expand all files Collapse all files

14
doc/design/assistant/blog/day_210__spring.mdwn
View file

@ -13,3 +13,17 @@ Fixed some problems around USB drives. One was a real jaw-dropping
bug: "git annex drop --from usbdrive" when the drive was not
connected still updated the location log to indicate it did not have
the file anymore! (Thank goodness for fsck..)
I've noticed that moving around files in direct mode repos is inneficient,
because the assistant re-checksums the "new" file. One way to avoid
that would be to have a lookup table from (inode, size, mtime) to
key, but I don't have one, and would like to avoid adding one.
Instead, I have a cunning plan to deal with this heuristically. If the
assistant can notice a file was removed and another file added at the same
time, it can compare the (inode, size, mtime) to see if it's a rename, and
avoid the checksum overhead.
The first step to getting there was to make the assistant better at
batching together delete+add events into a single rename commit. I'm happy
to say I've accomplished that, with no perceptable delay to commits.