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#!/bin/sh
#
# Copyright (c) 2007 Andy Parkins
#
# An example hook script to mail out commit update information.
#
# NOTE: This script is no longer under active development. There
# is another script, git-multimail, which is more capable and
# configurable and is largely backwards-compatible with this script;
# please see "contrib/hooks/multimail/". For instructions on how to
# migrate from post-receive-email to git-multimail, please see
# "README.migrate-from-post-receive-email" in that directory.
#
# This hook sends emails listing new revisions to the repository
# introduced by the change being reported. The rule is that (for
# branch updates) each commit will appear on one email and one email
# only.
#
# This hook is stored in the contrib/hooks directory. Your distribution
# will have put this somewhere standard. You should make this script
# executable then link to it in the repository you would like to use it in.
# For example, on debian the hook is stored in
# /usr/share/git-core/contrib/hooks/post-receive-email:
#
# cd /path/to/your/repository.git
# ln -sf /usr/share/git-core/contrib/hooks/post-receive-email hooks/post-receive
#
# This hook script assumes it is enabled on the central repository of a
# project, with all users pushing only to it and not between each other. It
# will still work if you don't operate in that style, but it would become
# possible for the email to be from someone other than the person doing the
# push.
#
# To help with debugging and use on pre-v1.5.1 git servers, this script will
# also obey the interface of hooks/update, taking its arguments on the
# command line. Unfortunately, hooks/update is called once for each ref.
# To avoid firing one email per ref, this script just prints its output to
# the screen when used in this mode. The output can then be redirected if
# wanted.
#
# Config
# ------
# hooks.mailinglist
# This is the list that all pushes will go to; leave it blank to not send
# emails for every ref update.
# hooks.announcelist
# This is the list that all pushes of annotated tags will go to. Leave it
# blank to default to the mailinglist field. The announce emails lists
# the short log summary of the changes since the last annotated tag.
# hooks.envelopesender
# If set then the -f option is passed to sendmail to allow the envelope
# sender address to be set
# hooks.emailprefix
# All emails have their subjects prefixed with this prefix, or "[SCM]"
# if emailprefix is unset, to aid filtering
# hooks.showrev
# The shell command used to format each revision in the email, with
# "%s" replaced with the commit id. Defaults to "git rev-list -1
# --pretty %s", displaying the commit id, author, date and log
# message. To list full patches separated by a blank line, you
# could set this to "git show -C %s; echo".
# To list a gitweb/cgit URL *and* a full patch for each change set, use this:
# "t=%s; printf 'http://.../?id=%%s' \$t; echo;echo; git show -C \$t; echo"
# Be careful if "..." contains things that will be expanded by shell "eval"
# or printf.
# hooks.emailmaxlines
# The maximum number of lines that should be included in the generated
# email body. If not specified, there is no limit.
# Lines beyond the limit are suppressed and counted, and a final
# line is added indicating the number of suppressed lines.
# hooks.diffopts
# Alternate options for the git diff-tree invocation that shows changes.
# Default is "--stat --summary --find-copies-harder". Add -p to those
# options to include a unified diff of changes in addition to the usual
# summary output.
#
# Notes
# -----
# All emails include the headers "X-Git-Refname", "X-Git-Oldrev",
# "X-Git-Newrev", and "X-Git-Reftype" to enable fine tuned filtering and
# give information for debugging.
#
# ---------------------------- Functions
#
# Function to prepare for email generation. This decides what type
# of update this is and whether an email should even be generated.
#
prep_for_email()
{
# --- Arguments
oldrev=$(git rev-parse $1)
newrev=$(git rev-parse $2)
refname="$3"
# --- Interpret
# 0000->1234 (create)
# 1234->2345 (update)
# 2345->0000 (delete)
if expr "$oldrev" : '0*$' >/dev/null
then
change_type="create"
else
if expr "$newrev" : '0*$' >/dev/null
then
change_type="delete"
else
change_type="update"
fi
fi
# --- Get the revision types
newrev_type=$(git cat-file -t $newrev 2> /dev/null)
oldrev_type=$(git cat-file -t "$oldrev" 2> /dev/null)
case "$change_type" in
create|update)
rev="$newrev"
rev_type="$newrev_type"
;;
delete)
rev="$oldrev"
rev_type="$oldrev_type"
;;
esac
# The revision type tells us what type the commit is, combined with
# the location of the ref we can decide between
# - working branch
# - tracking branch
# - unannoted tag
# - annotated tag
case "$refname","$rev_type" in
refs/tags/*,commit)
# un-annotated tag
refname_type="tag"
short_refname=${refname##refs/tags/}
;;
refs/tags/*,tag)
# annotated tag
refname_type="annotated tag"
short_refname=${refname##refs/tags/}
# change recipients
if [ -n "$announcerecipients" ]; then
recipients="$announcerecipients"
fi
;;
refs/heads/*,commit)
# branch
refname_type="branch"
short_refname=${refname##refs/heads/}
;;
refs/remotes/*,commit)
# tracking branch
refname_type="tracking branch"
short_refname=${refname##refs/remotes/}
echo >&2 "*** Push-update of tracking branch, $refname"
echo >&2 "*** - no email generated."
return 1
;;
*)
# Anything else (is there anything else?)
echo >&2 "*** Unknown type of update to $refname ($rev_type)"
echo >&2 "*** - no email generated"
return 1
;;
esac
# Check if we've got anyone to send to
if [ -z "$recipients" ]; then
case "$refname_type" in
"annotated tag")
config_name="hooks.announcelist"
;;
*)
config_name="hooks.mailinglist"
;;
esac
echo >&2 "*** $config_name is not set so no email will be sent"
echo >&2 "*** for $refname update $oldrev->$newrev"
return 1
fi
return 0
}
#
# Top level email generation function. This calls the appropriate
# body-generation routine after outputting the common header.
#
# Note this function doesn't actually generate any email output, that is
# taken care of by the functions it calls:
# - generate_email_header
# - generate_create_XXXX_email
# - generate_update_XXXX_email
# - generate_delete_XXXX_email
# - generate_email_footer
#
# Note also that this function cannot 'exit' from the script; when this
# function is running (in hook script mode), the send_mail() function
# is already executing in another process, connected via a pipe, and
# if this function exits without, whatever has been generated to that
# point will be sent as an email... even if nothing has been generated.
#
generate_email()
{
# Email parameters
# The email subject will contain the best description of the ref
# that we can build from the parameters
describe=$(git describe $rev 2>/dev/null)
if [ -z "$describe" ]; then
describe=$rev
fi
generate_email_header
# Call the correct body generation function
fn_name=general
case "$refname_type" in
"tracking branch"|branch)
fn_name=branch
;;
"annotated tag")
fn_name=atag
;;
esac
if [ -z "$maxlines" ]; then
generate_${change_type}_${fn_name}_email
else
generate_${change_type}_${fn_name}_email | limit_lines $maxlines
fi
generate_email_footer
}
generate_email_header()
{
# --- Email (all stdout will be the email)
# Generate header
cat <<-EOF
To: $recipients
Subject: ${emailprefix}$projectdesc $refname_type $short_refname ${change_type}d. $describe
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
X-Git-Refname: $refname
X-Git-Reftype: $refname_type
X-Git-Oldrev: $oldrev
X-Git-Newrev: $newrev
Auto-Submitted: auto-generated
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "$projectdesc".
The $refname_type, $short_refname has been ${change_type}d
EOF
}
generate_email_footer()
{
SPACE=" "
cat <<-EOF
hooks/post-receive
--${SPACE}
$projectdesc
EOF
}
# --------------- Branches
#
# Called for the creation of a branch
#
generate_create_branch_email()
{
# This is a new branch and so oldrev is not valid
echo " at $newrev ($newrev_type)"
echo ""
echo $LOGBEGIN
show_new_revisions
echo $LOGEND
}
#
# Called for the change of a pre-existing branch
#
generate_update_branch_email()
{
# Consider this:
# 1 --- 2 --- O --- X --- 3 --- 4 --- N
#
# O is $oldrev for $refname
# N is $newrev for $refname
# X is a revision pointed to by some other ref, for which we may
# assume that an email has already been generated.
# In this case we want to issue an email containing only revisions
# 3, 4, and N. Given (almost) by
#
# git rev-list N ^O --not --all
#
# The reason for the "almost", is that the "--not --all" will take
# precedence over the "N", and effectively will translate to
#
# git rev-list N ^O ^X ^N
#
# So, we need to build up the list more carefully. git rev-parse
# will generate a list of revs that may be fed into git rev-list.
# We can get it to make the "--not --all" part and then filter out
# the "^N" with:
#
# git rev-parse --not --all | grep -v N
#
# Then, using the --stdin switch to git rev-list we have effectively
# manufactured
#
# git rev-list N ^O ^X
#
# This leaves a problem when someone else updates the repository
# while this script is running. Their new value of the ref we're
# working on would be included in the "--not --all" output; and as
# our $newrev would be an ancestor of that commit, it would exclude
# all of our commits. What we really want is to exclude the current
# value of $refname from the --not list, rather than N itself. So:
#
# git rev-parse --not --all | grep -v $(git rev-parse $refname)
#
# Gets us to something pretty safe (apart from the small time
# between refname being read, and git rev-parse running - for that,
# I give up)
#
#
# Next problem, consider this:
# * --- B --- * --- O ($oldrev)
# \
# * --- X --- * --- N ($newrev)
#
# That is to say, there is no guarantee that oldrev is a strict
# subset of newrev (it would have required a --force, but that's
# allowed). So, we can't simply say rev-list $oldrev..$newrev.
# Instead we find the common base of the two revs and list from
# there.
#
# As above, we need to take into account the presence of X; if
# another branch is already in the repository and points at some of
# the revisions that we are about to output - we don't want them.
# The solution is as before: git rev-parse output filtered.
#
# Finally, tags: 1 --- 2 --- O --- T --- 3 --- 4 --- N
#
# Tags pushed into the repository generate nice shortlog emails that
# summarise the commits between them and the previous tag. However,
# those emails don't include the full commit messages that we output
# for a branch update. Therefore we still want to output revisions
# that have been output on a tag email.
#
# Luckily, git rev-parse includes just the tool. Instead of using
# "--all" we use "--branches"; this has the added benefit that
# "remotes/" will be ignored as well.
# List all of the revisions that were removed by this update, in a
# fast-forward update, this list will be empty, because rev-list O
# ^N is empty. For a non-fast-forward, O ^N is the list of removed
# revisions
fast_forward=""
rev=""
for rev in $(git rev-list $newrev..$oldrev)
do
revtype=$(git cat-file -t "$rev")
echo " discards $rev ($revtype)"
done
if [ -z "$rev" ]; then
fast_forward=1
fi
# List all the revisions from baserev to newrev in a kind of
# "table-of-contents"; note this list can include revisions that
# have already had notification emails and is present to show the
# full detail of the change from rolling back the old revision to
# the base revision and then forward to the new revision
for rev in $(git rev-list $oldrev..$newrev)
do
revtype=$(git cat-file -t "$rev")
echo " via $rev ($revtype)"
done
if [ "$fast_forward" ]; then
echo " from $oldrev ($oldrev_type)"
else
# 1. Existing revisions were removed. In this case newrev
# is a subset of oldrev - this is the reverse of a
# fast-forward, a rewind
# 2. New revisions were added on top of an old revision,
# this is a rewind and addition.
# (1) certainly happened, (2) possibly. When (2) hasn't
# happened, we set a flag to indicate that no log printout
# is required.
echo ""
# Find the common ancestor of the old and new revisions and
# compare it with newrev
baserev=$(git merge-base $oldrev $newrev)
rewind_only=""
if [ "$baserev" = "$newrev" ]; then
echo "This update discarded existing revisions and left the branch pointing at"
echo "a previous point in the repository history."
echo ""
echo " * -- * -- N ($newrev)"
echo " \\"
echo " O -- O -- O ($oldrev)"
echo ""
echo "The removed revisions are not necessarily gone - if another reference"
echo "still refers to them they will stay in the repository."
rewind_only=1
else
echo "This update added new revisions after undoing existing revisions. That is"
echo "to say, the old revision is not a strict subset of the new revision. This"
echo "situation occurs when you --force push a change and generate a repository"
echo "containing something like this:"
echo ""
echo " * -- * -- B -- O -- O -- O ($oldrev)"
echo " \\"
echo " N -- N -- N ($newrev)"
echo ""
echo "When this happens we assume that you've already had alert emails for all"
echo "of the O revisions, and so we here report only the revisions in the N"
echo "branch from the common base, B."
fi
fi
echo ""
if [ -z "$rewind_only" ]; then
echo "Those revisions listed above that are new to this repository have"
echo "not appeared on any other notification email; so we list those"
echo "revisions in full, below."
echo ""
echo $LOGBEGIN
show_new_revisions
# XXX: Need a way of detecting whether git rev-list actually
# outputted anything, so that we can issue a "no new
# revisions added by this update" message
echo $LOGEND
else
echo "No new revisions were added by this update."
fi
# The diffstat is shown from the old revision to the new revision.
# This is to show the truth of what happened in this change.
# There's no point showing the stat from the base to the new
# revision because the base is effectively a random revision at this
# point - the user will be interested in what this revision changed
# - including the undoing of previous revisions in the case of
# non-fast-forward updates.
echo ""
echo "Summary of changes:"
git diff-tree $diffopts $oldrev..$newrev
}
#
# Called for the deletion of a branch
#
generate_delete_branch_email()
{
echo " was $oldrev"
echo ""
echo $LOGBEGIN
git diff-tree -s --always --encoding=UTF-8 --pretty=oneline $oldrev
echo $LOGEND
}
# --------------- Annotated tags
#
# Called for the creation of an annotated tag
#
generate_create_atag_email()
{
echo " at $newrev ($newrev_type)"
generate_atag_email
}
#
# Called for the update of an annotated tag (this is probably a rare event
# and may not even be allowed)
#
generate_update_atag_email()
{
echo " to $newrev ($newrev_type)"
echo " from $oldrev (which is now obsolete)"
generate_atag_email
}
#
# Called when an annotated tag is created or changed
#
generate_atag_email()
{
# Use git for-each-ref to pull out the individual fields from the
# tag
eval $(git for-each-ref --shell --format='
tagobject=%(*objectname)
tagtype=%(*objecttype)
tagger=%(taggername)
tagged=%(taggerdate)' $refname
)
echo " tagging $tagobject ($tagtype)"
case "$tagtype" in
commit)
# If the tagged object is a commit, then we assume this is a
# release, and so we calculate which tag this tag is
# replacing
prevtag=$(git describe --abbrev=0 $newrev^ 2>/dev/null)
if [ -n "$prevtag" ]; then
echo " replaces $prevtag"
fi
;;
*)
echo " length $(git cat-file -s $tagobject) bytes"
;;
esac
echo " tagged by $tagger"
echo " on $tagged"
echo ""
echo $LOGBEGIN
# Show the content of the tag message; this might contain a change
# log or release notes so is worth displaying.
git cat-file tag $newrev | sed -e '1,/^$/d'
echo ""
case "$tagtype" in
commit)
# Only commit tags make sense to have rev-list operations
# performed on them
if [ -n "$prevtag" ]; then
# Show changes since the previous release
git shortlog "$prevtag..$newrev"
else
# No previous tag, show all the changes since time
# began
git shortlog $newrev
fi
;;
*)
# XXX: Is there anything useful we can do for non-commit
# objects?
;;
esac
echo $LOGEND
}
#
# Called for the deletion of an annotated tag
#
generate_delete_atag_email()
{
echo " was $oldrev"
echo ""
echo $LOGBEGIN
git diff-tree -s --always --encoding=UTF-8 --pretty=oneline $oldrev
echo $LOGEND
}
# --------------- General references
#
# Called when any other type of reference is created (most likely a
# non-annotated tag)
#
generate_create_general_email()
{
echo " at $newrev ($newrev_type)"
generate_general_email
}
#
# Called when any other type of reference is updated (most likely a
# non-annotated tag)
#
generate_update_general_email()
{
echo " to $newrev ($newrev_type)"
echo " from $oldrev"
generate_general_email
}
#
# Called for creation or update of any other type of reference
#
generate_general_email()
{
# Unannotated tags are more about marking a point than releasing a
# version; therefore we don't do the shortlog summary that we do for
# annotated tags above - we simply show that the point has been
# marked, and print the log message for the marked point for
# reference purposes
#
# Note this section also catches any other reference type (although
# there aren't any) and deals with them in the same way.
echo ""
if [ "$newrev_type" = "commit" ]; then
echo $LOGBEGIN
git diff-tree -s --always --encoding=UTF-8 --pretty=medium $newrev
echo $LOGEND
else
# What can we do here? The tag marks an object that is not
# a commit, so there is no log for us to display. It's
# probably not wise to output git cat-file as it could be a
# binary blob. We'll just say how big it is
echo "$newrev is a $newrev_type, and is $(git cat-file -s $newrev) bytes long."
fi
}
#
# Called for the deletion of any other type of reference
#
generate_delete_general_email()
{
echo " was $oldrev"
echo ""
echo $LOGBEGIN
git diff-tree -s --always --encoding=UTF-8 --pretty=oneline $oldrev
echo $LOGEND
}
# --------------- Miscellaneous utilities
#
# Show new revisions as the user would like to see them in the email.
#
show_new_revisions()
{
# This shows all log entries that are not already covered by
# another ref - i.e. commits that are now accessible from this
# ref that were previously not accessible
# (see generate_update_branch_email for the explanation of this
# command)
# Revision range passed to rev-list differs for new vs. updated
# branches.
if [ "$change_type" = create ]
then
# Show all revisions exclusive to this (new) branch.
revspec=$newrev
else
# Branch update; show revisions not part of $oldrev.
revspec=$oldrev..$newrev
fi
other_branches=$(git for-each-ref --format='%(refname)' refs/heads/ |
grep -F -v $refname)
git rev-parse --not $other_branches |
if [ -z "$custom_showrev" ]
then
git rev-list --pretty --stdin $revspec
else
git rev-list --stdin $revspec |
while read onerev
do
eval $(printf "$custom_showrev" $onerev)
done
fi
}
limit_lines()
{
lines=0
skipped=0
while IFS="" read -r line; do
lines=$((lines + 1))
if [ $lines -gt $1 ]; then
skipped=$((skipped + 1))
else
printf "%s\n" "$line"
fi
done
if [ $skipped -ne 0 ]; then
echo "... $skipped lines suppressed ..."
fi
}
send_mail()
{
if [ -n "$envelopesender" ]; then
/usr/sbin/sendmail -t -f "$envelopesender"
else
/usr/sbin/sendmail -t
fi
}
# ---------------------------- main()
# --- Constants
LOGBEGIN="- Log -----------------------------------------------------------------"
LOGEND="-----------------------------------------------------------------------"
# --- Config
# Set GIT_DIR either from the working directory, or from the environment
# variable.
GIT_DIR=$(git rev-parse --git-dir 2>/dev/null)
if [ -z "$GIT_DIR" ]; then
echo >&2 "fatal: post-receive: GIT_DIR not set"
exit 1
fi
projectdesc=$(sed -ne '1p' "$GIT_DIR/description" 2>/dev/null)
# Check if the description is unchanged from it's default, and shorten it to
# a more manageable length if it is
if expr "$projectdesc" : "Unnamed repository.*$" >/dev/null
then
projectdesc="UNNAMED PROJECT"
fi
recipients=$(git config hooks.mailinglist)
announcerecipients=$(git config hooks.announcelist)
envelopesender=$(git config hooks.envelopesender)
emailprefix=$(git config hooks.emailprefix || echo '[SCM] ')
custom_showrev=$(git config hooks.showrev)
maxlines=$(git config hooks.emailmaxlines)
diffopts=$(git config hooks.diffopts)
: ${diffopts:="--stat --summary --find-copies-harder"}
# --- Main loop
# Allow dual mode: run from the command line just like the update hook, or
# if no arguments are given then run as a hook script
if [ -n "$1" -a -n "$2" -a -n "$3" ]; then
# Output to the terminal in command line mode - if someone wanted to
# resend an email; they could redirect the output to sendmail
# themselves
prep_for_email $2 $3 $1 && PAGER= generate_email
else
while read oldrev newrev refname
do
prep_for_email $oldrev $newrev $refname || continue
generate_email $maxlines | send_mail
done
fi