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Edit File : post-receive-email \| Size : 21.55 KB
#!/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 Back

Edit File : post-receive-email | Size : 21.55 KB

#!/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

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