3 # Copyright (c) 2007 Andy Parkins
5 # An example hook script to mail out commit update information. This hook
6 # sends emails listing new revisions to the repository introduced by the
7 # change being reported. The rule is that (for branch updates) each commit
8 # will appear on one email and one email only.
10 # This hook is stored in the contrib/hooks directory. Your distribution
11 # will have put this somewhere standard. You should make this script
12 # executable then link to it in the repository you would like to use it in.
13 # For example, on debian the hook is stored in
14 # /usr/share/doc/git-core/contrib/hooks/post-receive-email:
16 # chmod a+x post-receive-email
17 # cd /path/to/your/repository.git
18 # ln -sf /usr/share/doc/git-core/contrib/hooks/post-receive-email hooks/post-receive
20 # This hook script assumes it is enabled on the central repository of a
21 # project, with all users pushing only to it and not between each other. It
22 # will still work if you don't operate in that style, but it would become
23 # possible for the email to be from someone other than the person doing the
26 # To help with debugging and use on pre-v1.5.1 git servers, this script will
27 # also obey the interface of hooks/update, taking its arguments on the
28 # command line. Unfortunately, hooks/update is called once for each ref.
29 # To avoid firing one email per ref, this script just prints its output to
30 # the screen when used in this mode. The output can then be redirected if
36 # This is the list that all pushes will go to; leave it blank to not send
37 # emails for every ref update.
39 # This is the list that all pushes of annotated tags will go to. Leave it
40 # blank to default to the mailinglist field. The announce emails lists
41 # the short log summary of the changes since the last annotated tag.
42 # hooks.envelopesender
43 # If set then the -f option is passed to sendmail to allow the envelope
44 # sender address to be set
46 # All emails have their subjects prefixed with this prefix, or "[SCM]"
47 # if emailprefix is unset, to aid filtering
49 # The shell command used to format each revision in the email, with
50 # "%s" replaced with the commit id. Defaults to "git rev-list -1
51 # --pretty %s", displaying the commit id, author, date and log
52 # message. To list full patches separated by a blank line, you
53 # could set this to "git show -C %s; echo".
54 # To list a gitweb/cgit URL *and* a full patch for each change set, use this:
55 # "t=%s; printf 'http://.../?id=%%s' \$t; echo;echo; git show -C \$t; echo"
56 # Be careful if "..." contains things that will be expanded by shell "eval"
61 # All emails include the headers "X-Git-Refname", "X-Git-Oldrev",
62 # "X-Git-Newrev", and "X-Git-Reftype" to enable fine tuned filtering and
63 # give information for debugging.
66 # ---------------------------- Functions
69 # Top level email generation function. This decides what type of update
70 # this is and calls the appropriate body-generation routine after outputting
73 # Note this function doesn't actually generate any email output, that is
74 # taken care of by the functions it calls:
75 # - generate_email_header
76 # - generate_create_XXXX_email
77 # - generate_update_XXXX_email
78 # - generate_delete_XXXX_email
79 # - generate_email_footer
84 oldrev=$(git rev-parse $1)
85 newrev=$(git rev-parse $2)
92 if expr "$oldrev" : '0*$' >/dev/null
96 if expr "$newrev" : '0*$' >/dev/null
104 # --- Get the revision types
105 newrev_type=$(git cat-file -t $newrev 2> /dev/null)
106 oldrev_type=$(git cat-file -t "$oldrev" 2> /dev/null)
107 case "$change_type" in
110 rev_type="$newrev_type"
114 rev_type="$oldrev_type"
118 # The revision type tells us what type the commit is, combined with
119 # the location of the ref we can decide between
124 case "$refname","$rev_type" in
128 short_refname=${refname##refs/tags/}
132 refname_type="annotated tag"
133 short_refname=${refname##refs/tags/}
135 if [ -n "$announcerecipients" ]; then
136 recipients="$announcerecipients"
141 refname_type="branch"
142 short_refname=${refname##refs/heads/}
144 refs/remotes/*,commit)
146 refname_type="tracking branch"
147 short_refname=${refname##refs/remotes/}
148 echo >&2 "*** Push-update of tracking branch, $refname"
149 echo >&2 "*** - no email generated."
153 # Anything else (is there anything else?)
154 echo >&2 "*** Unknown type of update to $refname ($rev_type)"
155 echo >&2 "*** - no email generated"
160 # Check if we've got anyone to send to
161 if [ -z "$recipients" ]; then
162 case "$refname_type" in
164 config_name="hooks.announcelist"
167 config_name="hooks.mailinglist"
170 echo >&2 "*** $config_name is not set so no email will be sent"
171 echo >&2 "*** for $refname update $oldrev->$newrev"
176 # The email subject will contain the best description of the ref
177 # that we can build from the parameters
178 describe=$(git describe $rev 2>/dev/null)
179 if [ -z "$describe" ]; then
183 generate_email_header
185 # Call the correct body generation function
187 case "$refname_type" in
188 "tracking branch"|branch)
195 generate_${change_type}_${fn_name}_email
197 generate_email_footer
200 generate_email_header()
202 # --- Email (all stdout will be the email)
206 Subject: ${emailprefix}$projectdesc $refname_type $short_refname ${change_type}d. $describe
207 X-Git-Refname: $refname
208 X-Git-Reftype: $refname_type
209 X-Git-Oldrev: $oldrev
210 X-Git-Newrev: $newrev
212 This is an automated email from the git hooks/post-receive script. It was
213 generated because a ref change was pushed to the repository containing
214 the project "$projectdesc".
216 The $refname_type, $short_refname has been ${change_type}d
220 generate_email_footer()
232 # --------------- Branches
235 # Called for the creation of a branch
237 generate_create_branch_email()
239 # This is a new branch and so oldrev is not valid
240 echo " at $newrev ($newrev_type)"
249 # Called for the change of a pre-existing branch
251 generate_update_branch_email()
254 # 1 --- 2 --- O --- X --- 3 --- 4 --- N
256 # O is $oldrev for $refname
257 # N is $newrev for $refname
258 # X is a revision pointed to by some other ref, for which we may
259 # assume that an email has already been generated.
260 # In this case we want to issue an email containing only revisions
261 # 3, 4, and N. Given (almost) by
263 # git rev-list N ^O --not --all
265 # The reason for the "almost", is that the "--not --all" will take
266 # precedence over the "N", and effectively will translate to
268 # git rev-list N ^O ^X ^N
270 # So, we need to build up the list more carefully. git rev-parse
271 # will generate a list of revs that may be fed into git rev-list.
272 # We can get it to make the "--not --all" part and then filter out
275 # git rev-parse --not --all | grep -v N
277 # Then, using the --stdin switch to git rev-list we have effectively
280 # git rev-list N ^O ^X
282 # This leaves a problem when someone else updates the repository
283 # while this script is running. Their new value of the ref we're
284 # working on would be included in the "--not --all" output; and as
285 # our $newrev would be an ancestor of that commit, it would exclude
286 # all of our commits. What we really want is to exclude the current
287 # value of $refname from the --not list, rather than N itself. So:
289 # git rev-parse --not --all | grep -v $(git rev-parse $refname)
291 # Get's us to something pretty safe (apart from the small time
292 # between refname being read, and git rev-parse running - for that,
296 # Next problem, consider this:
297 # * --- B --- * --- O ($oldrev)
299 # * --- X --- * --- N ($newrev)
301 # That is to say, there is no guarantee that oldrev is a strict
302 # subset of newrev (it would have required a --force, but that's
303 # allowed). So, we can't simply say rev-list $oldrev..$newrev.
304 # Instead we find the common base of the two revs and list from
307 # As above, we need to take into account the presence of X; if
308 # another branch is already in the repository and points at some of
309 # the revisions that we are about to output - we don't want them.
310 # The solution is as before: git rev-parse output filtered.
312 # Finally, tags: 1 --- 2 --- O --- T --- 3 --- 4 --- N
314 # Tags pushed into the repository generate nice shortlog emails that
315 # summarise the commits between them and the previous tag. However,
316 # those emails don't include the full commit messages that we output
317 # for a branch update. Therefore we still want to output revisions
318 # that have been output on a tag email.
320 # Luckily, git rev-parse includes just the tool. Instead of using
321 # "--all" we use "--branches"; this has the added benefit that
322 # "remotes/" will be ignored as well.
324 # List all of the revisions that were removed by this update, in a
325 # fast-forward update, this list will be empty, because rev-list O
326 # ^N is empty. For a non-fast-forward, O ^N is the list of removed
330 for rev in $(git rev-list $newrev..$oldrev)
332 revtype=$(git cat-file -t "$rev")
333 echo " discards $rev ($revtype)"
335 if [ -z "$rev" ]; then
339 # List all the revisions from baserev to newrev in a kind of
340 # "table-of-contents"; note this list can include revisions that
341 # have already had notification emails and is present to show the
342 # full detail of the change from rolling back the old revision to
343 # the base revision and then forward to the new revision
344 for rev in $(git rev-list $oldrev..$newrev)
346 revtype=$(git cat-file -t "$rev")
347 echo " via $rev ($revtype)"
350 if [ "$fast_forward" ]; then
351 echo " from $oldrev ($oldrev_type)"
353 # 1. Existing revisions were removed. In this case newrev
354 # is a subset of oldrev - this is the reverse of a
355 # fast-forward, a rewind
356 # 2. New revisions were added on top of an old revision,
357 # this is a rewind and addition.
359 # (1) certainly happened, (2) possibly. When (2) hasn't
360 # happened, we set a flag to indicate that no log printout
365 # Find the common ancestor of the old and new revisions and
366 # compare it with newrev
367 baserev=$(git merge-base $oldrev $newrev)
369 if [ "$baserev" = "$newrev" ]; then
370 echo "This update discarded existing revisions and left the branch pointing at"
371 echo "a previous point in the repository history."
373 echo " * -- * -- N ($newrev)"
375 echo " O -- O -- O ($oldrev)"
377 echo "The removed revisions are not necessarilly gone - if another reference"
378 echo "still refers to them they will stay in the repository."
381 echo "This update added new revisions after undoing existing revisions. That is"
382 echo "to say, the old revision is not a strict subset of the new revision. This"
383 echo "situation occurs when you --force push a change and generate a repository"
384 echo "containing something like this:"
386 echo " * -- * -- B -- O -- O -- O ($oldrev)"
388 echo " N -- N -- N ($newrev)"
390 echo "When this happens we assume that you've already had alert emails for all"
391 echo "of the O revisions, and so we here report only the revisions in the N"
392 echo "branch from the common base, B."
397 if [ -z "$rewind_only" ]; then
398 echo "Those revisions listed above that are new to this repository have"
399 echo "not appeared on any other notification email; so we list those"
400 echo "revisions in full, below."
406 # XXX: Need a way of detecting whether git rev-list actually
407 # outputted anything, so that we can issue a "no new
408 # revisions added by this update" message
412 echo "No new revisions were added by this update."
415 # The diffstat is shown from the old revision to the new revision.
416 # This is to show the truth of what happened in this change.
417 # There's no point showing the stat from the base to the new
418 # revision because the base is effectively a random revision at this
419 # point - the user will be interested in what this revision changed
420 # - including the undoing of previous revisions in the case of
421 # non-fast-forward updates.
423 echo "Summary of changes:"
424 git diff-tree --stat --summary --find-copies-harder $oldrev..$newrev
428 # Called for the deletion of a branch
430 generate_delete_branch_email()
435 git show -s --pretty=oneline $oldrev
439 # --------------- Annotated tags
442 # Called for the creation of an annotated tag
444 generate_create_atag_email()
446 echo " at $newrev ($newrev_type)"
452 # Called for the update of an annotated tag (this is probably a rare event
453 # and may not even be allowed)
455 generate_update_atag_email()
457 echo " to $newrev ($newrev_type)"
458 echo " from $oldrev (which is now obsolete)"
464 # Called when an annotated tag is created or changed
466 generate_atag_email()
468 # Use git for-each-ref to pull out the individual fields from the
470 eval $(git for-each-ref --shell --format='
471 tagobject=%(*objectname)
472 tagtype=%(*objecttype)
474 tagged=%(taggerdate)' $refname
477 echo " tagging $tagobject ($tagtype)"
481 # If the tagged object is a commit, then we assume this is a
482 # release, and so we calculate which tag this tag is
484 prevtag=$(git describe --abbrev=0 $newrev^ 2>/dev/null)
486 if [ -n "$prevtag" ]; then
487 echo " replaces $prevtag"
491 echo " length $(git cat-file -s $tagobject) bytes"
494 echo " tagged by $tagger"
500 # Show the content of the tag message; this might contain a change
501 # log or release notes so is worth displaying.
502 git cat-file tag $newrev | sed -e '1,/^$/d'
507 # Only commit tags make sense to have rev-list operations
509 if [ -n "$prevtag" ]; then
510 # Show changes since the previous release
511 git rev-list --pretty=short "$prevtag..$newrev" | git shortlog
513 # No previous tag, show all the changes since time
515 git rev-list --pretty=short $newrev | git shortlog
519 # XXX: Is there anything useful we can do for non-commit
528 # Called for the deletion of an annotated tag
530 generate_delete_atag_email()
535 git show -s --pretty=oneline $oldrev
539 # --------------- General references
542 # Called when any other type of reference is created (most likely a
545 generate_create_general_email()
547 echo " at $newrev ($newrev_type)"
549 generate_general_email
553 # Called when any other type of reference is updated (most likely a
556 generate_update_general_email()
558 echo " to $newrev ($newrev_type)"
561 generate_general_email
565 # Called for creation or update of any other type of reference
567 generate_general_email()
569 # Unannotated tags are more about marking a point than releasing a
570 # version; therefore we don't do the shortlog summary that we do for
571 # annotated tags above - we simply show that the point has been
572 # marked, and print the log message for the marked point for
575 # Note this section also catches any other reference type (although
576 # there aren't any) and deals with them in the same way.
579 if [ "$newrev_type" = "commit" ]; then
581 git show --no-color --root -s --pretty=medium $newrev
584 # What can we do here? The tag marks an object that is not
585 # a commit, so there is no log for us to display. It's
586 # probably not wise to output git cat-file as it could be a
587 # binary blob. We'll just say how big it is
588 echo "$newrev is a $newrev_type, and is $(git cat-file -s $newrev) bytes long."
593 # Called for the deletion of any other type of reference
595 generate_delete_general_email()
600 git show -s --pretty=oneline $oldrev
605 # --------------- Miscellaneous utilities
608 # Show new revisions as the user would like to see them in the email.
612 # This shows all log entries that are not already covered by
613 # another ref - i.e. commits that are now accessible from this
614 # ref that were previously not accessible
615 # (see generate_update_branch_email for the explanation of this
618 # Revision range passed to rev-list differs for new vs. updated
620 if [ "$change_type" = create ]
622 # Show all revisions exclusive to this (new) branch.
625 # Branch update; show revisions not part of $oldrev.
626 revspec=$oldrev..$newrev
629 other_branches=$(git for-each-ref --format='%(refname)' refs/heads/ |
631 git rev-parse --not $other_branches |
632 if [ -z "$custom_showrev" ]
634 git rev-list --pretty --stdin $revspec
636 git rev-list --stdin $revspec |
639 eval $(printf "$custom_showrev" $onerev)
647 if [ -n "$envelopesender" ]; then
648 /usr/sbin/sendmail -t -f "$envelopesender"
650 /usr/sbin/sendmail -t
654 # ---------------------------- main()
657 LOGBEGIN="- Log -----------------------------------------------------------------"
658 LOGEND="-----------------------------------------------------------------------"
661 # Set GIT_DIR either from the working directory, or from the environment
663 GIT_DIR=$(git rev-parse --git-dir 2>/dev/null)
664 if [ -z "$GIT_DIR" ]; then
665 echo >&2 "fatal: post-receive: GIT_DIR not set"
669 projectdesc=$(sed -ne '1p' "$GIT_DIR/description")
670 # Check if the description is unchanged from it's default, and shorten it to
671 # a more manageable length if it is
672 if expr "$projectdesc" : "Unnamed repository.*$" >/dev/null
674 projectdesc="UNNAMED PROJECT"
677 recipients=$(git config hooks.mailinglist)
678 announcerecipients=$(git config hooks.announcelist)
679 envelopesender=$(git config hooks.envelopesender)
680 emailprefix=$(git config hooks.emailprefix || echo '[SCM] ')
681 custom_showrev=$(git config hooks.showrev)
684 # Allow dual mode: run from the command line just like the update hook, or
685 # if no arguments are given then run as a hook script
686 if [ -n "$1" -a -n "$2" -a -n "$3" ]; then
687 # Output to the terminal in command line mode - if someone wanted to
688 # resend an email; they could redirect the output to sendmail
690 PAGER= generate_email $2 $3 $1
692 while read oldrev newrev refname
694 generate_email $oldrev $newrev $refname | send_mail