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update-hook-example.html
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update-hook-example.html
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<title>How to use the update hook</title>
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<body class="article">
<div id="header">
<h1>How to use the update hook</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p>When your developer runs git-push into the repository,
git-receive-pack is run (either locally or over ssh) as that
developer, so is hooks/update script. Quoting from the relevant
section of the documentation:</p></div>
<div class="literalblock">
<div class="content">
<pre><code>Before each ref is updated, if $GIT_DIR/hooks/update file exists
and executable, it is called with three parameters:</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>$GIT_DIR/hooks/update refname sha1-old sha1-new</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The refname parameter is relative to $GIT_DIR; e.g. for the
master head this is "refs/heads/master". Two sha1 are the
object names for the refname before and after the update. Note
that the hook is called before the refname is updated, so either
sha1-old is 0{40} (meaning there is no such ref yet), or it
should match what is recorded in refname.</code></pre>
</div></div>
<div class="paragraph"><p>So if your policy is (1) always require fast-forward push
(i.e. never allow "git-push repo +branch:branch"), (2) you
have a list of users allowed to update each branch, and (3) you
do not let tags to be overwritten, then you can use something
like this as your hooks/update script.</p></div>
<div class="paragraph"><p>[jc: editorial note. This is a much improved version by Carl
since I posted the original outline]</p></div>
<div class="listingblock">
<div class="content">
<pre><code>#!/bin/bash
umask 002
# If you are having trouble with this access control hook script
# you can try setting this to true. It will tell you exactly
# why a user is being allowed/denied access.
verbose=false
# Default shell globbing messes things up downstream
GLOBIGNORE=*
function grant {
$verbose && echo >&2 "-Grant- $1"
echo grant
exit 0
}
function deny {
$verbose && echo >&2 "-Deny- $1"
echo deny
exit 1
}
function info {
$verbose && echo >&2 "-Info- $1"
}
# Implement generic branch and tag policies.
# - Tags should not be updated once created.
# - Branches should only be fast-forwarded unless their pattern starts with '+'
case "$1" in
refs/tags/*)
git rev-parse --verify -q "$1" &&
deny >/dev/null "You can't overwrite an existing tag"
;;
refs/heads/*)
# No rebasing or rewinding
if expr "$2" : '0*$' >/dev/null; then
info "The branch '$1' is new..."
else
# updating -- make sure it is a fast-forward
mb=$(git-merge-base "$2" "$3")
case "$mb,$2" in
"$2,$mb") info "Update is fast-forward" ;;
*) noff=y; info "This is not a fast-forward update.";;
esac
fi
;;
*)
deny >/dev/null \
"Branch is not under refs/heads or refs/tags. What are you trying to do?"
;;
esac
# Implement per-branch controls based on username
allowed_users_file=$GIT_DIR/info/allowed-users
username=$(id -u -n)
info "The user is: '$username'"
if test -f "$allowed_users_file"
then
rc=$(cat $allowed_users_file | grep -v '^#' | grep -v '^$' |
while read heads user_patterns
do
# does this rule apply to us?
head_pattern=${heads#+}
matchlen=$(expr "$1" : "${head_pattern#+}")
test "$matchlen" = ${#1} || continue
# if non-ff, $heads must be with the '+' prefix
test -n "$noff" &&
test "$head_pattern" = "$heads" && continue
info "Found matching head pattern: '$head_pattern'"
for user_pattern in $user_patterns; do
info "Checking user: '$username' against pattern: '$user_pattern'"
matchlen=$(expr "$username" : "$user_pattern")
if test "$matchlen" = "${#username}"
then
grant "Allowing user: '$username' with pattern: '$user_pattern'"
fi
done
deny "The user is not in the access list for this branch"
done
)
case "$rc" in
grant) grant >/dev/null "Granting access based on $allowed_users_file" ;;
deny) deny >/dev/null "Denying access based on $allowed_users_file" ;;
*) ;;
esac
fi
allowed_groups_file=$GIT_DIR/info/allowed-groups
groups=$(id -G -n)
info "The user belongs to the following groups:"
info "'$groups'"
if test -f "$allowed_groups_file"
then
rc=$(cat $allowed_groups_file | grep -v '^#' | grep -v '^$' |
while read heads group_patterns
do
# does this rule apply to us?
head_pattern=${heads#+}
matchlen=$(expr "$1" : "${head_pattern#+}")
test "$matchlen" = ${#1} || continue
# if non-ff, $heads must be with the '+' prefix
test -n "$noff" &&
test "$head_pattern" = "$heads" && continue
info "Found matching head pattern: '$head_pattern'"
for group_pattern in $group_patterns; do
for groupname in $groups; do
info "Checking group: '$groupname' against pattern: '$group_pattern'"
matchlen=$(expr "$groupname" : "$group_pattern")
if test "$matchlen" = "${#groupname}"
then
grant "Allowing group: '$groupname' with pattern: '$group_pattern'"
fi
done
done
deny "None of the user's groups are in the access list for this branch"
done
)
case "$rc" in
grant) grant >/dev/null "Granting access based on $allowed_groups_file" ;;
deny) deny >/dev/null "Denying access based on $allowed_groups_file" ;;
*) ;;
esac
fi
deny >/dev/null "There are no more rules to check. Denying access"</code></pre>
</div></div>
<div class="paragraph"><p>This uses two files, $GIT_DIR/info/allowed-users and
allowed-groups, to describe which heads can be pushed into by
whom. The format of each file would look like this:</p></div>
<div class="literalblock">
<div class="content">
<pre><code>refs/heads/master junio
+refs/heads/pu junio
refs/heads/cogito$ pasky
refs/heads/bw/.* linus
refs/heads/tmp/.* .*
refs/tags/v[0-9].* junio</code></pre>
</div></div>
<div class="paragraph"><p>With this, Linus can push or create "bw/penguin" or "bw/zebra"
or "bw/panda" branches, Pasky can do only "cogito", and JC can
do master and pu branches and make versioned tags. And anybody
can do tmp/blah branches. The <em>+</em> sign at the pu record means
that JC can make non-fast-forward pushes on it.</p></div>
</div>
</div>
</div>
<div id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
Last updated 2016-03-10 14:55:41 PST
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