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