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NAME

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

SYNOPSIS

       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>]])

DESCRIPTION

       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.

OPTIONS

       -m
           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.

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

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

       -i
           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.

       -v
           Show the progress of checking files out.

       --trivial
           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.

       --aggressive
           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.

       --prefix=<prefix>/
           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.

       --exclude-per-directory=<gitignore>
           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.

       --index-output=<file>
           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.

       --no-sparse-checkout
           Disable sparse checkout support even if core.sparseCheckout is
           true.

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

       <tree-ish#>
           The id of the tree object(s) to be read/merged.

MERGING

       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  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  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 yes                 exists   exists   keep index
           15 no                  exists   exists   keep index

              clean I==H  I==M (H!=M)
             ------------------
           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 merge.

       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 done.

           ·   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 merge.

       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

       "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 removed.

       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:

           /*
           !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 support.

SEE ALSO

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

GIT

       Part of the git(1) suite