Re: orphan blob or what?

Tomas Carnecky [off-list ref] writes:

On Fri, 09 Nov 2012 11:37:04 -0800, bruce [off-list ref] wrote:

quoted

Tomas Carnecky [off-list ref] writes:

Just idiocy on my part. Thanks.

quoted

On Thu, 08 Nov 2012 16:24:36 -0800, bruce [off-list ref] wrote:

quoted

In today's and older clones of https://github.com/mirrors/linux.git I
find this object, 6fa98ea0ae40f9a38256f11e5dc270363f785aee, that I can't
figure out how to eliminate^h^h^h^h^h^h^h^h^hget rid of. I don't see it
in 'git fsck', 'git gc --aggressive --prune' doesn't seem to prune it,
can't see it via 'git log'. And yet

linux/.git/objects/pack$ git verify-pack -v *.idx | grep 6fa98ea0ae40f9a38256f11e5dc270363f785aee
6fa98ea0ae40f9a38256f11e5dc270363f785aee blob   1519697 124840 515299673
8231eaa31ce1107c1463deb6ec33f61618aedbb9 blob   67 63 515424513 1 6fa98ea0ae40f9a38256f11e5dc270363f785aee
f21a8c1b9d47736fa4e27def66f04b9fe2b4bc53 blob   90 83 515424576 1 6fa98ea0ae40f9a38256f11e5dc270363f785aee

Commit dee0bb9 (ASoC: Mark WM8962 Additional Control 4 register as volatile,
2010-09-29) references this blob.

It wasn't easy to find the commit. First I figured out at which path that file
was stored. Using git log -S'wm8962_reg[WM8962_MAX_REGISTER + 1]' I quickly
determined that the file was somewhere in sound/, more specifically
sound/soc/codecs/wm8962-tables.c. However a 'git log --
sound/soc/codecs/wm8962-tables.c' did not show any commit. That was strange,
because 'git log -S'WM8962_MAX_REGISTER + 1' --name-status --
sound/soc/codecs/' clearly shows that the file existed at some point in the
past. The commit is hidden from a simple 'git log' due to 'History
Simplification'. See the git-log man page. I added --full-history -p to the log
command, and searched in the pager for '6fa98e'. That revealed the commit which
references that blob:

    git log --full-history -p -- sound/soc/codecs/wm8962-tables.c

Thanks very much for the elucidation. I really must RTFMs. Only 44.786
Kib lines. Porcelain (mostly) first. I just can't eliminate the reading
I need to do.

FWIW, I was somewhat perplexed by searching for
c969f19f8fd17e600a16fe91aab66d86936cce0a in 'gitk -all'. It doesn't find
it BUT if I use --select-commit=c969f19f8fd17e600a16fe91aab66d86936cce0a
then positions to it. If I position away again it again can't find
it. Bother!

BTW, this was all occasioned by looking for unused large packed blobs as
an educational exercise.

Thanks again,
Bruce