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| #!/bin/sh |
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| |
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| # An example hook script to update a checked-out tree on a git push. |
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| # |
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| # This hook is invoked by git-receive-pack(1) when it reacts to git |
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| # push and updates reference(s) in its repository, and when the push |
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| # tries to update the branch that is currently checked out and the |
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| # receive.denyCurrentBranch configuration variable is set to |
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| # updateInstead. |
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| # |
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| # By default, such a push is refused if the working tree and the index |
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| # of the remote repository has any difference from the currently |
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| # checked out commit; when both the working tree and the index match |
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| # the current commit, they are updated to match the newly pushed tip |
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| # of the branch. This hook is to be used to override the default |
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| # behaviour; however the code below reimplements the default behaviour |
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| # as a starting point for convenient modification. |
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| # |
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| # The hook receives the commit with which the tip of the current |
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| # branch is going to be updated: |
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| commit=$1 |
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| |
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| # It can exit with a non-zero status to refuse the push (when it does |
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| # so, it must not modify the index or the working tree). |
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| die () { |
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| echo >&2 "$*" |
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| exit 1 |
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| } |
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| |
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| # Or it can make any necessary changes to the working tree and to the |
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| # index to bring them to the desired state when the tip of the current |
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| # branch is updated to the new commit, and exit with a zero status. |
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| # |
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| # For example, the hook can simply run git read-tree -u -m HEAD "$1" |
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| # in order to emulate git fetch that is run in the reverse direction |
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| # with git push, as the two-tree form of git read-tree -u -m is |
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| # essentially the same as git switch or git checkout that switches |
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| # branches while keeping the local changes in the working tree that do |
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| # not interfere with the difference between the branches. |
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| |
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| # The below is a more-or-less exact translation to shell of the C code |
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| # for the default behaviour for git's push-to-checkout hook defined in |
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| # the push_to_deploy() function in builtin/receive-pack.c. |
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| # |
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| # Note that the hook will be executed from the repository directory, |
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| # not from the working tree, so if you want to perform operations on |
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| # the working tree, you will have to adapt your code accordingly, e.g. |
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| # by adding "cd .." or using relative paths. |
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| |
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| if ! git update-index -q --ignore-submodules --refresh |
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| then |
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| die "Up-to-date check failed" |
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| fi |
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| |
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| if ! git diff-files --quiet --ignore-submodules -- |
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| then |
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| die "Working directory has unstaged changes" |
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| fi |
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| |
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| # This is a rough translation of: |
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| # |
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| # head_has_history() ? "HEAD" : EMPTY_TREE_SHA1_HEX |
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| if git cat-file -e HEAD 2>/dev/null |
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| then |
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| head=HEAD |
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| else |
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| head=$(git hash-object -t tree --stdin </dev/null) |
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| fi |
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| |
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| if ! git diff-index --quiet --cached --ignore-submodules $head -- |
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| then |
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| die "Working directory has staged changes" |
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| fi |
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| |
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| if ! git read-tree -u -m "$commit" |
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| then |
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| die "Could not update working tree to new HEAD" |
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| fi |