CONSTANT: OBJ_COMMIT 1
CONSTANT: OBJ_TREE 2
CONSTANT: OBJ_BLOB 3
CONSTANT: OBJ_TAG 4
CONSTANT: OBJ_OFS_DELTA 6
CONSTANT: OBJ_REF_DELTA 7

"/Users/erg/factor" set-current-directory
"3dff14e2f3d0c8db662a8c6aeb5dbd427f4258eb" git-read-pack

"/Users/erg/factor" set-current-directory
git-log

"/Users/erg/factor" set-current-directory
"401597a387add5b52111d1dd954d6250ee2b2688" git-object-from-pack

git verify-pack -v .git/objects/pack/pack-816d07912ac9f9b463f89b7e663298e3c8fedda5.pack | grep a6e0867b
a6e0867b2222f3b0976e9aac6539fe8f12a552e2 commit 51 63 12938 1 8000d6670e1abdbaeebc4452c6cccbec68069ca1
! problem: a6e0867b2222f3b0976e9aac6539fe8f12a552e2

! investigate:
http://stackoverflow.com/questions/9478023/is-the-git-binary-diff-algorithm-delta-storage-standardized/9478566#9478566

http://stackoverflow.com/questions/801577/how-to-recover-git-objects-damaged-by-hard-disk-failure
git ls-tree

! eh
http://schacon.github.io/git/technical/pack-format.txt
https://schacon.github.io/gitbook/7_the_packfile.html

! most useful doc:
http://git.rsbx.net/Documents/Git_Data_Formats.txt

! git show:
git show -s --pretty=raw 2ca509a8fe681d58f80d402ea9da2be20b9ab0a0

! git add
git add -p   # parts of files

! git reset
git merge --abort  is alias for  git reset --merge

! Merge strategies:
octopus: git merge fixes enhancements # two branches merging
git merge --no-commit maint # merge maint into current branch, but do not make a commit yet
http://git-scm.com/docs/git-merge
http://stackoverflow.com/questions/161813/fix-merge-conflicts-in-git?rq=1

# common base:
git show :1:_widget.html.erb
# 'ours'
git show :2:_widget.html.erb
# 'theirs'
git show :3:_widget.html.erb

git show :3:_widget.html.erb >_widget.html.erb
git add _widget.html.erb
aka
git checkout --theirs _widget.html.erb



Guys, "ours" and "theirs" is relative to whether or not you are merging or rebasing. If you're merging, then "ours" means the branch you're merging into, and "theirs" is the branch you're merging in. When you're rebasing, then "ours" means the commits you're rebasing onto, while "theirs" refers to the commits that you want to rebase. –  Cupcake May 26 '14 at 4:27


! random
https://github.com/libgit2/libgit2/blob/091165c53b2bcd5d41fb71d43ed5a23a3d96bf5d/docs/diff-internals.md
https://github.com/schacon/git-server/blob/master/git-server.rb

https://git-scm.com/blog

https://github.com/gitchain/gitchain/blob/2baefefd1795b358c98335f120738b60966fa09d/git/delta.go
https://www.kernel.org/pub/software/scm/git/docs/user-manual.html#git-concepts

! graphs in terminal:
http://stackoverflow.com/questions/1064361/unable-to-show-a-git-tree-in-terminal

git-daemon:
 git daemon --reuseaddr --verbose  --base-path=. --export-all
$> export GIT_TRACE_PACKET=1
   git ls-remote git://127.0.0.1/git-bottom-up



raw git:
https://schacon.github.io/gitbook/7_raw_git.html

# write object
git hash-object -w myfile.txt

-----------------------------------
Now lets say you want to create a tree from your new objects. The git mktree command makes it pretty simple to generate new tree objects from git ls-tree formatted output. For example, if you write the following to a file named '/tmp/tree.txt' :

100644 blob 6ff87c4664981e4397625791c8ea3bbb5f2279a3    file1
100644 blob 3bb0e8592a41ae3185ee32266c860714980dbed7    file2

$ cat /tmp/tree.txt | git mk-tree
f66a66ab6a7bfe86d52a66516ace212efa00fe1f

100644 blob 6ff87c4664981e4397625791c8ea3bbb5f2279a3    file1-copy
040000 tree f66a66ab6a7bfe86d52a66516ace212efa00fe1f    our_files

$ cat /tmp/newtree.txt | git mk-tree
5bac6559179bd543a024d6d187692343e2d8ae83


.
|-- file1-copy
`-- our_files
    |-- file1
    `-- file2

1 directory, 3 files

---------------------------------------------



$ export GIT_INDEX_FILE=/tmp/index
$ git read-tree --prefix=copy1/  5bac6559
$ git read-tree --prefix=copy2/  5bac6559
$ git write-tree 
bb2fa6de7625322322382215d9ea78cfe76508c1

$>git ls-tree bb2fa
040000 tree 5bac6559179bd543a024d6d187692343e2d8ae83    copy1
040000 tree 5bac6559179bd543a024d6d187692343e2d8ae83    copy2

-------------------------------


GIT_AUTHOR_NAME
GIT_AUTHOR_EMAIL
GIT_AUTHOR_DATE
GIT_COMMITTER_NAME
GIT_COMMITTER_EMAIL
GIT_COMMITTER_DATE
$ git commit-tree bb2fa < /tmp/message
a5f85ba5875917319471dfd98dfc636c1dc65650

$ git update-ref refs/heads/master a5f85ba5875917319471dfd98dfc636c1dc65650


https://github.com/magit/magit

https://www.kernel.org/pub/software/scm/git/docs/user-manual.html