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e632c464 AS |
1 | #!/bin/sh |
2 | ||
3 | # An example hook script to update a checked-out tree on a git push. | |
4 | # | |
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. | |
10 | # | |
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. | |
18 | # | |
19 | # The hook receives the commit with which the tip of the current | |
20 | # branch is going to be updated: | |
21 | commit=$1 | |
22 | ||
23 | # It can exit with a non-zero status to refuse the push (when it does | |
24 | # so, it must not modify the index or the working tree). | |
25 | die () { | |
26 | echo >&2 "$*" | |
27 | exit 1 | |
28 | } | |
29 | ||
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. | |
33 | # | |
34 | # For example, the hook can simply run git read-tree -u -m HEAD "$1" | |
35 | # in order to emulate git fetch that is run in the reverse direction | |
36 | # with git push, as the two-tree form of git read-tree -u -m is | |
37 | # essentially the same as git switch or git checkout that switches | |
38 | # branches while keeping the local changes in the working tree that do | |
39 | # not interfere with the difference between the branches. | |
40 | ||
41 | # The below is a more-or-less exact translation to shell of the C code | |
42 | # for the default behaviour for git's push-to-checkout hook defined in | |
43 | # the push_to_deploy() function in builtin/receive-pack.c. | |
44 | # | |
45 | # Note that the hook will be executed from the repository directory, | |
46 | # not from the working tree, so if you want to perform operations on | |
47 | # the working tree, you will have to adapt your code accordingly, e.g. | |
48 | # by adding "cd .." or using relative paths. | |
49 | ||
50 | if ! git update-index -q --ignore-submodules --refresh | |
51 | then | |
52 | die "Up-to-date check failed" | |
53 | fi | |
54 | ||
55 | if ! git diff-files --quiet --ignore-submodules -- | |
56 | then | |
57 | die "Working directory has unstaged changes" | |
58 | fi | |
59 | ||
60 | # This is a rough translation of: | |
61 | # | |
62 | # head_has_history() ? "HEAD" : EMPTY_TREE_SHA1_HEX | |
63 | if git cat-file -e HEAD 2>/dev/null | |
64 | then | |
65 | head=HEAD | |
66 | else | |
67 | head=$(git hash-object -t tree --stdin </dev/null) | |
68 | fi | |
69 | ||
70 | if ! git diff-index --quiet --cached --ignore-submodules $head -- | |
71 | then | |
72 | die "Working directory has staged changes" | |
73 | fi | |
74 | ||
75 | if ! git read-tree -u -m "$commit" | |
76 | then | |
77 | die "Could not update working tree to new HEAD" | |
78 | fi |