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| 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 |
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