git/list[1] front-page[2] threads[3] people[4] search[5] about
 

Re: cannot fetch arm git tree

From
RLRussell King - ARM Linux <linux@arm.linux.org.uk>
Date
Jan 16, 2011, 13:42 UTC
Message-ID
<20110116134248.GD27542@n2100.arm.linux.org.uk>
In-Reply-To
<AANLkTinrZ0GnT71GCueUUpAXM5ckq+LBd0RjA51DMR-a@mail.gmail.com>
On Sun, Jan 16, 2011 at 09:10:17PM +0800, Jello huang wrote:
> yes,git doesn't  handle that case and i rename the pack name,but there is
> also the similar error.Now i just delet the git tree and  clone it again
> tonight .
_Always_ without fail fetch Linus' tree before pulling my tree.

My tree is a rsync clone of the objects and pack files in Linus' tree, plus whatever git decided to build on top of that - for local commits that's individual object files. For remote pulls, that's probably a few small pack files.

There is *no* repacking of my tree. So the only times it gets 'repacked' is when Linus repacks his tree.

Let's say you already have a copy of my tree from a month ago, and Linus has pulled some work from me into his tree, and repacked his tree into one single pack file. At the moment, the largest pack file from Linus is 400MB plus a 50MB index.

You already have most of the contents of that 400MB pack file, but if you're missing even _one_ object which is contained within it, git will have to download the _entire_ 400MB pack file and index file to retrieve it.

However, if you first fetch Linus' tree via the git protocol, it can just request the objects it doesn't have from the git server. That will mean you'll have all the objects in the large pack files before you start trying to pull my tree, and git won't have to download 400MB for the sake of retrieving just maybe 10k that you didn't have.

This isn't something special with my tree - it's a side effect of the http protocol git uses. So, before you fetch _any_ http-based git tree, first make sure you're up to date with Linus'.

(I update my tree from Linus' in rsync mode to make http-based stuff a lot more friendly to people using it - some of whom are stuck behind firewalls which can only do http. Fetching a constantly repacked git tree via http results in hundreds of megabytes needing to be fetched every time.)

So please, whenever possible, always fetch Linus' latest tree _first_ and then mine. Same goes for any other http based tree which doesn't auto-repack.

Previous: Uwe Kleine-KönigNext: Jello huang
Message 2 of 15 in “Re: cannot fetch arm git tree”
  1. Uwe Kleine-KönigJan 16, 2011
  2. Russell King - ARM LinuxJan 16, 2011
  3. Jello huangJan 17, 2011
  4. Detlef VollmannJan 21, 2011
  5. Uwe Kleine-KönigJan 21, 2011
  6. Russell King - ARM LinuxJan 21, 2011
  7. Detlef VollmannJan 21, 2011
  8. Jello huangJan 21, 2011
  9. Russell King - ARM LinuxJan 21, 2011
  10. Detlef VollmannJan 21, 2011
  11. Uwe Kleine-KönigJan 21, 2011
  12. Miles BaderJan 24, 2011
  13. Johannes SixtJan 24, 2011
  14. J.H.Jan 24, 2011
  15. Russell King - ARM LinuxJan 24, 2011

Read the whole thread, see it on lore, or plain text.

$ cat FOOTERMessages come from the public archive at lore.kernel.org/git, fetched every hour. The front page is chosen and written each morning by an AI editor and can be wrong; the threads themselves are the record. About and API. For agents: an MCP server at https://gitlist.dev/mcp, and any thread, story or person page as Markdown by adding .md to its URL (or sending Accept: text/markdown). Details in /llms.txt.