The seventeenth batch
[git.git] / templates / hooks--push-to-checkout.sample
1 #!/bin/sh
3 # An example hook script to update a checked-out tree on a git push.
5 # This hook is invoked by git-receive-pack(1) when it reacts to git
6 # push and updates reference(s) in its repository, and when the push
7 # tries to update the branch that is currently checked out and the
8 # receive.denyCurrentBranch configuration variable is set to
9 # updateInstead.
11 # By default, such a push is refused if the working tree and the index
12 # of the remote repository has any difference from the currently
13 # checked out commit; when both the working tree and the index match
14 # the current commit, they are updated to match the newly pushed tip
15 # of the branch. This hook is to be used to override the default
16 # behaviour; however the code below reimplements the default behaviour
17 # as a starting point for convenient modification.
19 # The hook receives the commit with which the tip of the current
20 # branch is going to be updated:
21 commit=$1
23 # It can exit with a non-zero status to refuse the push (when it does
24 # so, it must not modify the index or the working tree).
25 die () {
26 echo >&2 "$*"
27 exit 1
30 # Or it can make any necessary changes to the working tree and to the
31 # index to bring them to the desired state when the tip of the current
32 # branch is updated to the new commit, and exit with a zero status.
34 # For example, the hook can simply run git read-tree -u -m HEAD "$1"
35 # in order to emulate git fetch that is run in the reverse direction
36 # with git push, as the two-tree form of git read-tree -u -m is
37 # essentially the same as git switch or git checkout that switches
38 # branches while keeping the local changes in the working tree that do
39 # not interfere with the difference between the branches.
41 # The below is a more-or-less exact translation to shell of the C code
42 # for the default behaviour for git's push-to-checkout hook defined in
43 # the push_to_deploy() function in builtin/receive-pack.c.
45 # Note that the hook will be executed from the repository directory,
46 # not from the working tree, so if you want to perform operations on
47 # the working tree, you will have to adapt your code accordingly, e.g.
48 # by adding "cd .." or using relative paths.
50 if ! git update-index -q --ignore-submodules --refresh
51 then
52 die "Up-to-date check failed"
55 if ! git diff-files --quiet --ignore-submodules --
56 then
57 die "Working directory has unstaged changes"
60 # This is a rough translation of:
62 # head_has_history() ? "HEAD" : EMPTY_TREE_SHA1_HEX
63 if git cat-file -e HEAD 2>/dev/null
64 then
65 head=HEAD
66 else
67 head=$(git hash-object -t tree --stdin </dev/null)
70 if ! git diff-index --quiet --cached --ignore-submodules $head --
71 then
72 die "Working directory has staged changes"
75 if ! git read-tree -u -m "$commit"
76 then
77 die "Could not update working tree to new HEAD"