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GIT-READ-TREE(1)                                 Git Manual                                 GIT-READ-TREE(1)

       git-read-tree - Reads tree information into the index

       git read-tree [[-m [--trivial] [--aggressive] | --reset | --prefix=<prefix>]
                       [-u [--exclude-per-directory=<gitignore>] | -i]]
                       [--index-output=<file>] [--no-sparse-checkout]
                       (--empty | <tree-ish1> [<tree-ish2> [<tree-ish3>]])

       Reads the tree information given by <tree-ish> into the index, but does not actually update any of
       the files it "caches". (see: git-checkout-index(1))

       Optionally, it can merge a tree into the index, perform a fast-forward (i.e. 2-way) merge, or a 3-way
       merge, with the -m flag. When used with -m, the -u flag causes it to also update the files in the
       work tree with the result of the merge.

       Trivial merges are done by git read-tree itself. Only conflicting paths will be in unmerged state
       when git read-tree returns.

           Perform a merge, not just a read. The command will refuse to run if your index file has unmerged
           entries, indicating that you have not finished previous merge you started.

           Same as -m, except that unmerged entries are discarded instead of failing.

           After a successful merge, update the files in the work tree with the result of the merge.

           Usually a merge requires the index file as well as the files in the working tree to be up to date
           with the current head commit, in order not to lose local changes. This flag disables the check
           with the working tree and is meant to be used when creating a merge of trees that are not
           directly related to the current working tree status into a temporary index file.

       -n, --dry-run
           Check if the command would error out, without updating the index nor the files in the working
           tree for real.

           Show the progress of checking files out.

           Restrict three-way merge by git read-tree to happen only if there is no file-level merging
           required, instead of resolving merge for trivial cases and leaving conflicting files unresolved
           in the index.

           Usually a three-way merge by git read-tree resolves the merge for really trivial cases and leaves
           other cases unresolved in the index, so that porcelains can implement different merge policies.
           This flag makes the command resolve a few more cases internally:

              when one side removes a path and the other side leaves the path unmodified. The resolution is
               to remove that path.

              when both sides remove a path. The resolution is to remove that path.

              when both sides add a path identically. The resolution is to add that path.

           Keep the current index contents, and read the contents of the named tree-ish under the directory
           at <prefix>. The command will refuse to overwrite entries that already existed in the original
           index file. Note that the <prefix>/ value must end with a slash.

           When running the command with -u and -m options, the merge result may need to overwrite paths
           that are not tracked in the current branch. The command usually refuses to proceed with the merge
           to avoid losing such a path. However this safety valve sometimes gets in the way. For example, it
           often happens that the other branch added a file that used to be a generated file in your branch,
           and the safety valve triggers when you try to switch to that branch after you ran make but before
           running make clean to remove the generated file. This option tells the command to read
           per-directory exclude file (usually .gitignore) and allows such an untracked but explicitly
           ignored file to be overwritten.

           Instead of writing the results out to $GIT_INDEX_FILE, write the resulting index in the named
           file. While the command is operating, the original index file is locked with the same mechanism
           as usual. The file must allow to be rename(2)ed into from a temporary file that is created next
           to the usual index file; typically this means it needs to be on the same filesystem as the index
           file itself, and you need write permission to the directories the index file and index output
           file are located in.

           Disable sparse checkout support even if core.sparseCheckout is true.

           Instead of reading tree object(s) into the index, just empty it.

           The id of the tree object(s) to be read/merged.

       If -m is specified, git read-tree can perform 3 kinds of merge, a single tree merge if only 1 tree is
       given, a fast-forward merge with 2 trees, or a 3-way merge if 3 trees are provided.

   Single Tree Merge
       If only 1 tree is specified, git read-tree operates as if the user did not specify -m, except that if
       the original index has an entry for a given pathname, and the contents of the path match with the
       tree being read, the stat info from the index is used. (In other words, the index's stat()s take
       precedence over the merged tree's).

       That means that if you do a git read-tree -m <newtree> followed by a git checkout-index -f -u -a, the
       git checkout-index only checks out the stuff that really changed.

       This is used to avoid unnecessary false hits when git diff-files is run after git read-tree.

   Two Tree Merge
       Typically, this is invoked as git read-tree -m $H $M, where $H is the head commit of the current
       repository, and $M is the head of a foreign tree, which is simply ahead of $H (i.e. we are in a
       fast-forward situation).

       When two trees are specified, the user is telling git read-tree the following:

        1. The current index and work tree is derived from $H, but the user may have local changes in them
           since $H.

        2. The user wants to fast-forward to $M.

       In this case, the git read-tree -m $H $M command makes sure that no local change is lost as the
       result of this "merge". Here are the "carry forward" rules, where "I" denotes the index, "clean"
       means that index and work tree coincide, and "exists"/"nothing" refer to the presence of a path in
       the specified commit:

              I                   H        M        Result
             -------------------------------------------------------0 ------------------------------------------------------0
           0  nothing             nothing  nothing  (does not happen)
           1  nothing             nothing  exists   use M
           2  nothing             exists   nothing  remove path from index
           3  nothing             exists   exists,  use M if "initial checkout",
                                           H == M   keep index otherwise
                                           exists,  fail
                                           H != M

              clean I==H  I==M
             ------------------4 -----------------4
           4  yes   N/A   N/A     nothing  nothing  keep index
           5  no    N/A   N/A     nothing  nothing  keep index

           6  yes   N/A   yes     nothing  exists   keep index
           7  no    N/A   yes     nothing  exists   keep index
           8  yes   N/A   no      nothing  exists   fail
           9  no    N/A   no      nothing  exists   fail

           10 yes   yes   N/A     exists   nothing  remove path from index
           11 no    yes   N/A     exists   nothing  fail
           12 yes   no    N/A     exists   nothing  fail
           13 no    no    N/A     exists   nothing  fail

              clean (H==M)
             ------14 -----14
           14 yes                 exists   exists   keep index
           15 no                  exists   exists   keep index

              clean I==H  I==M (H!=M)
             ------------------16 -----------------16
           16 yes   no    no      exists   exists   fail
           17 no    no    no      exists   exists   fail
           18 yes   no    yes     exists   exists   keep index
           19 no    no    yes     exists   exists   keep index
           20 yes   yes   no      exists   exists   use M
           21 no    yes   no      exists   exists   fail

       In all "keep index" cases, the index entry stays as in the original index file. If the entry is not
       up to date, git read-tree keeps the copy in the work tree intact when operating under the -u flag.

       When this form of git read-tree returns successfully, you can see which of the "local changes" that
       you made were carried forward by running git diff-index --cached $M. Note that this does not
       necessarily match what git diff-index --cached $H would have produced before such a two tree merge.
       This is because of cases 18 and 19 --- if you already had the changes in $M (e.g. maybe you picked it
       up via e-mail in a patch form), git diff-index --cached $H would have told you about the change
       before this merge, but it would not show in git diff-index --cached $M output after the two-tree

       Case 3 is slightly tricky and needs explanation. The result from this rule logically should be to
       remove the path if the user staged the removal of the path and then switching to a new branch. That
       however will prevent the initial checkout from happening, so the rule is modified to use M (new tree)
       only when the content of the index is empty. Otherwise the removal of the path is kept as long as $H
       and $M are the same.

   3-Way Merge
       Each "index" entry has two bits worth of "stage" state. stage 0 is the normal one, and is the only
       one you'd see in any kind of normal use.

       However, when you do git read-tree with three trees, the "stage" starts out at 1.

       This means that you can do

           $ git read-tree -m <tree1> <tree2> <tree3>

       and you will end up with an index with all of the <tree1> entries in "stage1", all of the <tree2>
       entries in "stage2" and all of the <tree3> entries in "stage3". When performing a merge of another
       branch into the current branch, we use the common ancestor tree as <tree1>, the current branch head
       as <tree2>, and the other branch head as <tree3>.

       Furthermore, git read-tree has special-case logic that says: if you see a file that matches in all
       respects in the following states, it "collapses" back to "stage0":

          stage 2 and 3 are the same; take one or the other (it makes no difference - the same work has
           been done on our branch in stage 2 and their branch in stage 3)

          stage 1 and stage 2 are the same and stage 3 is different; take stage 3 (our branch in stage 2
           did not do anything since the ancestor in stage 1 while their branch in stage 3 worked on it)

          stage 1 and stage 3 are the same and stage 2 is different take stage 2 (we did something while
           they did nothing)

       The git write-tree command refuses to write a nonsensical tree, and it will complain about unmerged
       entries if it sees a single entry that is not stage 0.

       OK, this all sounds like a collection of totally nonsensical rules, but it's actually exactly what
       you want in order to do a fast merge. The different stages represent the "result tree" (stage 0, aka
       "merged"), the original tree (stage 1, aka "orig"), and the two trees you are trying to merge (stage
       2 and 3 respectively).

       The order of stages 1, 2 and 3 (hence the order of three <tree-ish> command line arguments) are
       significant when you start a 3-way merge with an index file that is already populated. Here is an
       outline of how the algorithm works:

          if a file exists in identical format in all three trees, it will automatically collapse to
           "merged" state by git read-tree.

          a file that has any difference what-so-ever in the three trees will stay as separate entries in
           the index. It's up to "porcelain policy" to determine how to remove the non-0 stages, and insert
           a merged version.

          the index file saves and restores with all this information, so you can merge things
           incrementally, but as long as it has entries in stages 1/2/3 (i.e., "unmerged entries") you can't
           write the result. So now the merge algorithm ends up being really simple:

              you walk the index in order, and ignore all entries of stage 0, since they've already been

              if you find a "stage1", but no matching "stage2" or "stage3", you know it's been removed from
               both trees (it only existed in the original tree), and you remove that entry.

              if you find a matching "stage2" and "stage3" tree, you remove one of them, and turn the other
               into a "stage0" entry. Remove any matching "stage1" entry if it exists too. .. all the normal
               trivial rules ..

       You would normally use git merge-index with supplied git merge-one-file to do this last step. The
       script updates the files in the working tree as it merges each path and at the end of a successful

       When you start a 3-way merge with an index file that is already populated, it is assumed that it
       represents the state of the files in your work tree, and you can even have files with changes
       unrecorded in the index file. It is further assumed that this state is "derived" from the stage 2
       tree. The 3-way merge refuses to run if it finds an entry in the original index file that does not
       match stage 2.

       This is done to prevent you from losing your work-in-progress changes, and mixing your random changes
       in an unrelated merge commit. To illustrate, suppose you start from what has been committed last to
       your repository:

           $ JC=`git rev-parse --verify "HEAD^0"`
           $ git checkout-index -f -u -a $JC

       You do random edits, without running git update-index. And then you notice that the tip of your
       "upstream" tree has advanced since you pulled from him:

           $ git fetch git://.... linus
           $ LT=`git rev-parse FETCH_HEAD`

       Your work tree is still based on your HEAD ($JC), but you have some edits since. Three-way merge
       makes sure that you have not added or modified index entries since $JC, and if you haven't, then does
       the right thing. So with the following sequence:

           $ git read-tree -m -u `git merge-base $JC $LT` $JC $LT
           $ git merge-index git-merge-one-file -a
           $ echo "Merge with Linus" | \
             git commit-tree `git write-tree` -p $JC -p $LT

       what you would commit is a pure merge between $JC and $LT without your work-in-progress changes, and
       your work tree would be updated to the result of the merge.

       However, if you have local changes in the working tree that would be overwritten by this merge, git
       read-tree will refuse to run to prevent your changes from being lost.

       In other words, there is no need to worry about what exists only in the working tree. When you have
       local changes in a part of the project that is not involved in the merge, your changes do not
       interfere with the merge, and are kept intact. When they do interfere, the merge does not even start
       (git read-tree complains loudly and fails without modifying anything). In such a case, you can simply
       continue doing what you were in the middle of doing, and when your working tree is ready (i.e. you
       have finished your work-in-progress), attempt the merge again.

       "Sparse checkout" allows populating the working directory sparsely. It uses the skip-worktree bit
       (see git-update-index(1)) to tell Git whether a file in the working directory is worth looking at.

       git read-tree and other merge-based commands (git merge, git checkout...) can help maintaining the
       skip-worktree bitmap and working directory update. $GIT_DIR/info/sparse-checkout is used to define
       the skip-worktree reference bitmap. When git read-tree needs to update the working directory, it
       resets the skip-worktree bit in the index based on this file, which uses the same syntax as
       .gitignore files. If an entry matches a pattern in this file, skip-worktree will not be set on that
       entry. Otherwise, skip-worktree will be set.

       Then it compares the new skip-worktree value with the previous one. If skip-worktree turns from set
       to unset, it will add the corresponding file back. If it turns from unset to set, that file will be

       While $GIT_DIR/info/sparse-checkout is usually used to specify what files are in, you can also
       specify what files are not in, using negate patterns. For example, to remove the file unwanted:


       Another tricky thing is fully repopulating the working directory when you no longer want sparse
       checkout. You cannot just disable "sparse checkout" because skip-worktree bits are still in the index
       and your working directory is still sparsely populated. You should re-populate the working directory
       with the $GIT_DIR/info/sparse-checkout file content as follows:


       Then you can disable sparse checkout. Sparse checkout support in git read-tree and similar commands
       is disabled by default. You need to turn core.sparseCheckout on in order to have sparse checkout

       git-write-tree(1); git-ls-files(1); gitignore(5)

       Part of the git(1) suite

Git 1.8.3                                        05/24/2013                                 GIT-READ-TREE(1)

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