Re: get commit ID from a tree object ID

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Sat, Mar 17, 2018 at 04:01:28PM +0300, Konstantin Khomoutov wrote:

> So actually a generic approach to what you need is a full scan of all
> the commits in the repository with recursive traversing of the hierarchy
> of trees of each of them (via `git ls-tree`) and looking for the SHA-1
> name of the reference tree object.  As you can see, this is not going to
> be fast on repos of realistic size.

If you assume that the tree is a root tree (which is by no means
certain, but a good guess), it's not _too_ bad to do:

  git rev-list --all --format='%T %H' | grep ^$desired_tree

That's linear in the number of commits, but still takes only about 7
seconds on linux.git.

If you want to dig further, you can use the diff machinery to show which
commit introduced a particular tree, like:

  git rev-list --all |
  git diff-tree --stdin --pretty=raw --raw -t -r |
  less +/$desired_tree

That "less" will find the mentioned tree, and then you'll have to
manually read the commit. It would be possible to do it mechanically
with a short perl script, but I'll leave that as an exercise for the
reader.

-Peff



[Index of Archives]     [Linux Kernel Development]     [Gcc Help]     [IETF Annouce]     [DCCP]     [Netdev]     [Networking]     [Security]     [V4L]     [Bugtraq]     [Yosemite]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux SCSI]     [Fedora Users]

  Powered by Linux