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#!/bin/bash
#
# Copyright (c) 2007 Andy Parkins
# Copyright (c) 2008 Stephen Haberman
#
# 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.
#
# Differences from the contrib script (off the top of my head):
#
# * Sends combined diff output which is great for viewing merge commits
# * Changes order of commit listing to be oldest to newest
# * Configurable sendmail path
# * Use git describe --tags for the email subject to pick up commitnumbers
#
# Config
# ------
# hooks.post-receive-email.mailinglist
# This is the list that all pushes will go to; leave it blank to not send
# emails for every ref update.
# hooks.post-receive-email.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.post-receive-email.envelopesender
# If set then the -f option is passed to sendmail to allow the envelope
# sender address to be set
# hooks.post-receive-email.sendmail
# The path to sendmail, e.g. /usr/sbin/sendmail or /bin/msmtp
# USER_EMAIL
# Environment variable that should be set by your repository-specific
# post-receive hook. E.g. export USER_EMAIL=${USER}@example.com
#
# 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
. $(dirname $0)/functions
#
# Top level email generation function. This decides what type of update
# this is and calls the appropriate body-generation routine after outputting
# the common header
#
# Note this function doesn't actually generate any email output, that is
# taken care of by the functions it calls:
# - generate_email_header
# - generate_create_XXXX_email
# - generate_update_XXXX_email
# - generate_delete_XXXX_email
#
generate_email()
{
# --- Arguments
oldrev=$(git rev-parse $1)
newrev=$(git rev-parse $2)
refname="$3"
set_change_type
set_rev_types
set_describe_tags
# The revision type tells us what type the commit is, combined with
# the location of the ref we can decide between
# - working branch
# - tracking branch
# - unannoted tag
# - annotated tag
case "$refname","$rev_type" in
refs/tags/*,commit)
# un-annotated tag
refname_type="tag"
function="ltag"
short_refname=${refname##refs/tags/}
;;
refs/tags/*,tag)
# annotated tag
refname_type="annotated tag"
function="atag"
short_refname=${refname##refs/tags/}
# change recipients
if [ -n "$announcerecipients" ]; then
recipients="$announcerecipients"
fi
;;
refs/heads/*,commit)
# branch
refname_type="branch"
function="branch"
short_refname=${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."
exit 0
;;
*)
# Anything else (is there anything else?)
echo >&2 "*** Unknown type of update to $refname ($rev_type)"
echo >&2 "*** - no email generated"
exit 1
;;
esac
# Check if we've got anyone to send to
if [ -z "$recipients" ]; then
case "$refname_type" in
"annotated tag")
config_name="hooks.post-receive-email.announcelist"
;;
*)
config_name="hooks.post-receive-email.mailinglist"
;;
esac
echo >&2 "*** $config_name is not set so no email will be sent"
echo >&2 "*** for $refname update $oldrev->$newrev"
exit 0
fi
generate_email_header
generate_${change_type}_${function}_email
}
generate_email_header()
{
# --- Email (all stdout will be the email)
# Generate header
cat <<-EOF
From: $USER_EMAIL
To: $recipients
Subject: ${emailprefix} $short_refname $refname_type ${change_type}d. $describe_tags
X-Git-Refname: $refname
X-Git-Reftype: $refname_type
X-Git-Oldrev: $oldrev
X-Git-Newrev: $newrev
The $refname_type, $short_refname has been ${change_type}d
EOF
}
# --------------- Branches
#
# Called for the creation of a branch
#
generate_create_branch_email()
{
# This is a new branch and so oldrev is not valid
git rev-list --pretty=format:" at %h %s" --no-walk "$newrev" | grep -vP "^commit"
set_new_commits
echo ""
echo $LOGBEGIN
echo "$new_commits" | git rev-list --reverse --stdin | while read commit ; do
echo ""
git rev-list --no-walk --pretty "$commit"
git diff-tree --cc "$commit"
echo ""
echo $LOGEND
done
oldest_new=$(echo "$new_commits" | git rev-list --stdin | tail -n 1)
if [ "$oldest_new" != "" ] ; then
echo ""
echo "Summary of changes:"
git diff-tree --stat $oldest_new^..$newrev
fi
}
#
# Called for the change of a pre-existing branch
#
generate_update_branch_email()
{
# List all of the revisions that were removed by this update (hopefully empty)
git rev-list --first-parent --pretty=format:" discards %h %s" $newrev..$oldrev | grep -vP "^commit"
# List all of the revisions that were added by this update
git rev-list --first-parent --pretty=format:" via %h %s" $oldrev..$newrev | grep -vP "^commit"
removed=$(git rev-list $newrev..$oldrev)
if [ "$removed" == "" ] ; then
git rev-list --no-walk --pretty=format:" from %h %s" $oldrev | grep -vP "^commit"
else
# Must be rewind, could be rewind+addition
echo ""
# Find the common ancestor of the old and new revisions and compare it with newrev
baserev=$(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 ($oldrev)"
echo ""
echo "The removed revisions are not necessarilly gone - if another reference"
echo "still refers to them they will stay in the repository."
rewind_only=1
else
echo "This update added new revisions after undoing existing revisions. That is"
echo "to say, the old revision is not a strict subset of the new revision. This"
echo "situation occurs when you --force push a change and generate a repository"
echo "containing something like this:"
echo ""
echo " * -- * -- B -- O -- O -- O ($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."
set_new_commits
echo ""
echo $LOGBEGIN
echo "$new_commits" | git rev-list --reverse --stdin | while read commit ; do
echo ""
git rev-list --no-walk --pretty "$commit"
git diff-tree --cc "$commit"
echo ""
echo $LOGEND
done
# 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
else
echo "No new revisions were added by this update."
fi
# Show the diffstat which is what really happened (new commits/whatever aside)
echo ""
echo "Summary of changes:"
git diff-tree --stat --find-copies-harder $oldrev..$newrev
}
#
# Called for the deletion of a branch
#
generate_delete_branch_email()
{
echo " was $oldrev"
echo ""
echo $LOGEND
git show -s --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 rev-list --pretty=short "$prevtag..$newrev" | git shortlog
else
# No previous tag, show all the changes since time
# began
git rev-list --pretty=short $newrev | git shortlog
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 $oldrev ($oldrev_type)"
echo ""
echo $LOGEND
git show -s --pretty=oneline $oldrev
echo $LOGEND
}
# --------------- General references
#
# Called when any other type of reference is created (most likely a
# non-annotated tag)
#
generate_create_ltag_email()
{
echo " at $newrev ($newrev_type)"
generate_ltag_email
}
#
# Called when any other type of reference is updated (most likely a
# non-annotated tag)
#
generate_update_ltag_email()
{
echo " to $newrev ($newrev_type)"
echo " from $oldrev ($oldrev_type)"
generate_ltag_email
}
#
# Called for creation or update of any other type of reference
#
generate_ltag_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 show --no-color --root -s --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_ltag_email()
{
echo " was $oldrev ($oldrev_type)"
echo ""
echo $LOGEND
git show -s --pretty=oneline $oldrev
echo $LOGEND
}
send_mail()
{
if [ -n "$envelopesender" ] ; then
$sendmail -t -f "$envelopesender"
else
$sendmail -t
fi
}
# ---------------------------- main()
# --- Constants
LOGBEGIN="- Log -----------------------------------------------------------------"
LOGEND="-----------------------------------------------------------------------"
# --- Config
# Set GIT_DIR either from the working directory or the environment variable.
GIT_DIR=$(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' "$GIT_DIR/description")
# Shorten the description if it's the default
if expr "$projectdesc" : "Unnamed repository.*$" >/dev/null ; then
projectdesc="UNNAMED"
fi
recipients=$(git config hooks.post-receive-email.mailinglist)
announcerecipients=$(git config hooks.post-receive-email.announcelist)
envelopesender=$(git config hooks.post-receive-email.envelopesender)
emailprefix="[$projectdesc]"
debug=$(git config hooks.post-receive-email.debug)
sendmail=$(git config hooks.post-receive-email.sendmail)
# --- 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
PAGER= generate_email $2 $3 $1
else
while read oldrev newrev refname
do
if [ "$debug" == "true" ] ; then
generate_email $oldrev $newrev $refname > "${refname//\//.}.out"
else
generate_email $oldrev $newrev $refname | send_mail
fi
done
fi
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