contrib/hooks/post-receive-email

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2007 Andy Parkins
   4 #
   5 # An example hook script to mail out commit update information.  This hook sends emails
   6 # listing new revisions to the repository introduced by the change being reported.  The
   7 # rule is that (for branch updates) each commit will appear on one email and one email
   8 # only.
   9 #
  10 # This hook is stored in the contrib/hooks directory.  Your distribution will have put
  11 # this somewhere standard.  You should make this script executable then link to it in
  12 # the repository you would like to use it in.  For example, on debian the hook is stored
  13 # in /usr/share/doc/git-core/contrib/hooks/post-receive-email:
  14 #
  15 #  chmod a+x post-receive-email
  16 #  cd /path/to/your/repository.git
  17 #  ln -sf /usr/share/doc/git-core/contrib/hooks/post-receive-email hooks/post-receive
  18 #
  19 # This hook script assumes it is enabled on the central repository of a project, with
  20 # all users pushing only to it and not between each other.  It will still work if you
  21 # don't operate in that style, but it would become possible for the email to be from
  22 # someone other than the person doing the push.
  23 #
  24 # Config
  25 # ------
  26 # hooks.mailinglist
  27 #   This is the list that all pushes will go to; leave it blank to not send
  28 #   emails for every ref update.
  29 # hooks.announcelist
  30 #   This is the list that all pushes of annotated tags will go to.  Leave it
  31 #   blank to default to the mailinglist field.  The announce emails lists the
  32 #   short log summary of the changes since the last annotated tag.
  33 # hooks.envelopesender
  34 #   If set then the -f option is passed to sendmail to allow the envelope sender
  35 #   address to be set
  36 #
  37 # Notes
  38 # -----
  39 # All emails have their subjects prefixed with "[SCM]" to aid filtering.
  40 # All emails include the headers "X-Git-Refname", "X-Git-Oldrev",
  41 # "X-Git-Newrev", and "X-Git-Reftype" to enable fine tuned filtering and
  42 # give information for debugging.
  43 #
  44
  45 # ---------------------------- Functions
  46
  47 #
  48 # Top level email generation function.  This decides what type of update
  49 # this is and calls the appropriate body-generation routine after outputting
  50 # the common header
  51 #
  52 # Note this function doesn't actually generate any email output, that is taken
  53 # care of by the functions it calls:
  54 #  - generate_email_header
  55 #  - generate_create_XXXX_email
  56 #  - generate_update_XXXX_email
  57 #  - generate_delete_XXXX_email
  58 #  - generate_email_footer
  59 #
  60 generate_email()
  61 {
  62         # --- Arguments
  63         oldrev=$(git rev-parse $1)
  64         newrev=$(git rev-parse $2)
  65         refname="$3"
  66
  67         # --- Interpret
  68         # 0000->1234 (create)
  69         # 1234->2345 (update)
  70         # 2345->0000 (delete)
  71         if expr "$oldrev" : '0*$' >/dev/null
  72         then
  73                 change_type="create"
  74         else
  75                 if expr "$newrev" : '0*$' >/dev/null
  76                 then
  77                         change_type="delete"
  78                 else
  79                         change_type="update"
  80                 fi
  81         fi
  82
  83         # --- Get the revision types
  84         newrev_type=$(git cat-file -t $newrev 2> /dev/null)
  85         oldrev_type=$(git cat-file -t "$oldrev" 2> /dev/null)
  86         case "$change_type" in
  87         create|update)
  88                 rev="$newrev"
  89                 rev_type="$newrev_type"
  90                 ;;
  91         delete)
  92                 rev="$oldrev"
  93                 rev_type="$oldrev_type"
  94                 ;;
  95         esac
  96
  97         # The revision type tells us what type the commit is, combined with
  98         # the location of the ref we can decide between
  99         #  - working branch
 100         #  - tracking branch
 101         #  - unannoted tag
 102         #  - annotated tag
 103         case "$refname","$rev_type" in
 104                 refs/tags/*,commit)
 105                         # un-annotated tag
 106                         refname_type="tag"
 107                         short_refname=${refname##refs/tags/}
 108                         ;;
 109                 refs/tags/*,tag)
 110                         # annotated tag
 111                         refname_type="annotated tag"
 112                         short_refname=${refname##refs/tags/}
 113                         # change recipients
 114                         if [ -n "$announcerecipients" ]; then
 115                                 recipients="$announcerecipients"
 116                         fi
 117                         ;;
 118                 refs/heads/*,commit)
 119                         # branch
 120                         refname_type="branch"
 121                         short_refname=${refname##refs/heads/}
 122                         ;;
 123                 refs/remotes/*,commit)
 124                         # tracking branch
 125                         refname_type="tracking branch"
 126                         short_refname=${refname##refs/remotes/}
 127                         echo >&2 "*** Push-update of tracking branch, $refname"
 128                         echo >&2 "***  - no email generated."
 129                         exit 0
 130                         ;;
 131                 *)
 132                         # Anything else (is there anything else?)
 133                         echo >&2 "*** Unknown type of update to $refname ($rev_type)"
 134                         echo >&2 "***  - no email generated"
 135                         exit 1
 136                         ;;
 137         esac
 138
 139         # Check if we've got anyone to send to
 140         if [ -z "$recipients" ]; then
 141                 case "$refname_type" in
 142                         "annotated tag")
 143                                 config_name="hooks.announcelist"
 144                                 ;;
 145                         *)
 146                                 config_name="hooks.mailinglist"
 147                                 ;;
 148                 esac
 149                 echo >&2 "*** $config_name is not set so no email will be sent"
 150                 echo >&2 "*** for $refname update $oldrev->$newrev"
 151                 exit 0
 152         fi
 153
 154         # Email parameters
 155         # The committer will be obtained from the latest existing rev; so
 156         # for a deletion it will be the oldrev, for the others, then newrev
 157         committer=$(git show --pretty=full -s $rev | sed -ne "s/^Commit: //p" |
 158                 sed -ne 's/\(.*\) </"\1" </p')
 159         # The email subject will contain the best description of the ref
 160         # that we can build from the parameters
 161         describe=$(git describe $rev 2>/dev/null)
 162         if [ -z "$describe" ]; then
 163                 describe=$rev
 164         fi
 165
 166         generate_email_header
 167
 168         # Call the correct body generation function
 169         fn_name=general
 170         case "$refname_type" in
 171         "tracking branch"|branch)
 172                 fn_name=branch
 173                 ;;
 174         "annotated tag")
 175                 fn_name=atag
 176                 ;;
 177         esac
 178         generate_${change_type}_${fn_name}_email
 179
 180         generate_email_footer
 181 }
 182
 183 generate_email_header()
 184 {
 185         # --- Email (all stdout will be the email)
 186         # Generate header
 187         cat <<-EOF
 188         To: $recipients
 189         Subject: ${EMAILPREFIX}$projectdesc $refname_type, $short_refname, ${change_type}d. $describe
 190         X-Git-Refname: $refname
 191         X-Git-Reftype: $refname_type
 192         X-Git-Oldrev: $oldrev
 193         X-Git-Newrev: $newrev
 194
 195         This is an automated email from the git hooks/post-receive script. It was
 196         generated because a ref change was pushed to the repository containing
 197         the project "$projectdesc".
 198
 199         The $refname_type, $short_refname has been ${change_type}d
 200         EOF
 201 }
 202
 203 generate_email_footer()
 204 {
 205         cat <<-EOF
 206
 207
 208         hooks/post-receive
 209         --
 210         $projectdesc
 211         EOF
 212 }
 213
 214 # --------------- Branches
 215
 216 #
 217 # Called for the creation of a branch
 218 #
 219 generate_create_branch_email()
 220 {
 221         # This is a new branch and so oldrev is not valid
 222         echo "        at  $newrev ($newrev_type)"
 223         echo ""
 224
 225         echo $LOGBEGIN
 226         # This shows all log entries that are not already covered by
 227         # another ref - i.e. commits that are now accessible from this
 228         # ref that were previously not accessible (see generate_update_branch_email
 229         # for the explanation of this command)
 230         git rev-parse --not --branches | grep -v $(git rev-parse $refname) |
 231         git rev-list --pretty --stdin $newrev
 232         echo $LOGEND
 233 }
 234
 235 #
 236 # Called for the change of a pre-existing branch
 237 #
 238 generate_update_branch_email()
 239 {
 240         # Consider this:
 241         #   1 --- 2 --- O --- X --- 3 --- 4 --- N
 242         #
 243         # O is $oldrev for $refname
 244         # N is $newrev for $refname
 245         # X is a revision pointed to by some other ref, for which we may
 246         #   assume that an email has already been generated.
 247         # In this case we want to issue an email containing only revisions
 248         # 3, 4, and N.  Given (almost) by
 249         #
 250         #  git-rev-list N ^O --not --all
 251         #
 252         # The reason for the "almost", is that the "--not --all" will take
 253         # precedence over the "N", and effectively will translate to
 254         #
 255         #  git-rev-list N ^O ^X ^N
 256         #
 257         # So, we need to build up the list more carefully.  git-rev-parse will
 258         # generate a list of revs that may be fed into git-rev-list.  We can get
 259         # it to make the "--not --all" part and then filter out the "^N" with:
 260         #
 261         #  git-rev-parse --not --all | grep -v N
 262         #
 263         # Then, using the --stdin switch to git-rev-list we have effectively
 264         # manufactured
 265         #
 266         #  git-rev-list N ^O ^X
 267         #
 268         # This leaves a problem when someone else updates the repository
 269         # while this script is running.  Their new value of the ref we're working
 270         # on would be included in the "--not --all" output; and as our $newrev
 271         # would be an ancestor of that commit, it would exclude all of our
 272         # commits.  What we really want is to exclude the current value of
 273         # $refname from the --not list, rather than N itself.  So:
 274         #
 275         #  git-rev-parse --not --all | grep -v $(git-rev-parse $refname)
 276         #
 277         # Get's us to something pretty safe (apart from the small time between
 278         # refname being read, and git-rev-parse running - for that, I give up)
 279         #
 280         #
 281         # Next problem, consider this:
 282         #   * --- B --- * --- O ($oldrev)
 283         #          \
 284         #           * --- X --- * --- N ($newrev)
 285         #
 286         # That is to say, there is no guarantee that oldrev is a strict subset of
 287         # newrev (it would have required a --force, but that's allowed).  So, we
 288         # can't simply say rev-list $oldrev..$newrev.  Instead we find the common
 289         # base of the two revs and list from there.
 290         #
 291         # As above, we need to take into account the presence of X; if another
 292         # branch is already in the repository and points at some of the revisions
 293         # that we are about to output - we don't want them.  The solution is as
 294         # before: git-rev-parse output filtered.
 295         #
 296         # Finally, tags:
 297         #   1 --- 2 --- O --- T --- 3 --- 4 --- N
 298         #
 299         # Tags pushed into the repository generate nice shortlog emails that
 300         # summarise the commits between them and the previous tag.  However,
 301         # those emails don't include the full commit messages that we output
 302         # for a branch update.  Therefore we still want to output revisions
 303         # that have been output on a tag email.
 304         #
 305         # Luckily, git-rev-parse includes just the tool.  Instead of using "--all"
 306         # we use "--branches"; this has the added benefit that "remotes/" will
 307         # be ignored as well.
 308
 309         # List all of the revisions that were removed by this update, in a fast forward
 310         # update, this list will be empty, because rev-list O ^N is empty.  For a non
 311         # fast forward, O ^N is the list of removed revisions
 312         fast_forward=""
 313         rev=""
 314         for rev in $(git rev-list $newrev..$oldrev)
 315         do
 316                 revtype=$(git cat-file -t "$rev")
 317                 echo "  discards  $rev ($revtype)"
 318         done
 319         if [ -z "$rev" ]; then
 320                 fast_forward=1
 321         fi
 322
 323         # List all the revisions from baserev to newrev in a kind of
 324         # "table-of-contents"; note this list can include revisions that have
 325         # already had notification emails and is present to show the full detail
 326         # of the change from rolling back the old revision to the base revision and
 327         # then forward to the new revision
 328         for rev in $(git rev-list $oldrev..$newrev)
 329         do
 330                 revtype=$(git cat-file -t "$rev")
 331                 echo "       via  $rev ($revtype)"
 332         done
 333
 334         if [ "$fast_forward" ]; then
 335                 echo "      from  $oldrev ($oldrev_type)"
 336         else
 337                 #  1. Existing revisions were removed.  In this case newrev is a
 338                 #     subset of oldrev - this is the reverse of a fast-forward,
 339                 #     a rewind
 340                 #  2. New revisions were added on top of an old revision, this is
 341                 #     a rewind and addition.
 342
 343                 # (1) certainly happened, (2) possibly.  When (2) hasn't happened,
 344                 # we set a flag to indicate that no log printout is required.
 345
 346                 echo ""
 347
 348                 # Find the common ancestor of the old and new revisions and compare
 349                 # it with newrev
 350                 baserev=$(git merge-base $oldrev $newrev)
 351                 rewind_only=""
 352                 if [ "$baserev" = "$newrev" ]; then
 353                         echo "This update discarded existing revisions and left the branch pointing at"
 354                         echo "a previous point in the repository history."
 355                         echo ""
 356                         echo " * -- * -- N ($newrev)"
 357                         echo "            \\"
 358                         echo "             O -- O -- O ($oldrev)"
 359                         echo ""
 360                         echo "The removed revisions are not necessarilly gone - if another reference"
 361                         echo "still refers to them they will stay in the repository."
 362                         rewind_only=1
 363                 else
 364                         echo "This update added new revisions after undoing existing revisions.  That is"
 365                         echo "to say, the old revision is not a strict subset of the new revision.  This"
 366                         echo "situation occurs when you --force push a change and generate a repository"
 367                         echo "containing something like this:"
 368                         echo ""
 369                         echo " * -- * -- B -- O -- O -- O ($oldrev)"
 370                         echo "            \\"
 371                         echo "             N -- N -- N ($newrev)"
 372                         echo ""
 373                         echo "When this happens we assume that you've already had alert emails for all"
 374                         echo "of the O revisions, and so we here report only the revisions in the N"
 375                         echo "branch from the common base, B."
 376                 fi
 377         fi
 378
 379         echo ""
 380         if [ -z "$rewind_only" ]; then
 381                 echo "Those revisions listed above that are new to this repository have"
 382                 echo "not appeared on any other notification email; so we list those"
 383                 echo "revisions in full, below."
 384
 385                 echo ""
 386                 echo $LOGBEGIN
 387                 git rev-parse --not --branches | grep -v $(git rev-parse $refname) |
 388                 git rev-list --pretty --stdin $oldrev..$newrev
 389
 390                 # XXX: Need a way of detecting whether git rev-list actually outputted
 391                 # anything, so that we can issue a "no new revisions added by this
 392                 # update" message
 393
 394                 echo $LOGEND
 395         else
 396                 echo "No new revisions were added by this update."
 397         fi
 398
 399         # The diffstat is shown from the old revision to the new revision.  This
 400         # is to show the truth of what happened in this change.  There's no point
 401         # showing the stat from the base to the new revision because the base
 402         # is effectively a random revision at this point - the user will be
 403         # interested in what this revision changed - including the undoing of
 404         # previous revisions in the case of non-fast forward updates.
 405         echo ""
 406         echo "Summary of changes:"
 407         git diff-tree --stat --summary --find-copies-harder $oldrev..$newrev
 408 }
 409
 410 #
 411 # Called for the deletion of a branch
 412 #
 413 generate_delete_branch_email()
 414 {
 415         echo "       was  $oldrev"
 416         echo ""
 417         echo $LOGEND
 418         git show -s --pretty=oneline $oldrev
 419         echo $LOGEND
 420 }
 421
 422 # --------------- Annotated tags
 423
 424 #
 425 # Called for the creation of an annotated tag
 426 #
 427 generate_create_atag_email()
 428 {
 429         echo "        at  $newrev ($newrev_type)"
 430
 431         generate_atag_email
 432 }
 433
 434 #
 435 # Called for the update of an annotated tag (this is probably a rare event
 436 # and may not even be allowed)
 437 #
 438 generate_update_atag_email()
 439 {
 440         echo "        to  $newrev ($newrev_type)"
 441         echo "      from  $oldrev (which is now obsolete)"
 442
 443         generate_atag_email
 444 }
 445
 446 #
 447 # Called when an annotated tag is created or changed
 448 #
 449 generate_atag_email()
 450 {
 451         # Use git-for-each-ref to pull out the individual fields from the tag
 452         eval $(git for-each-ref --shell --format='
 453         tagobject=%(*objectname)
 454         tagtype=%(*objecttype)
 455         tagger=%(taggername)
 456         tagged=%(taggerdate)' $refname
 457         )
 458
 459         echo "   tagging  $tagobject ($tagtype)"
 460         case "$tagtype" in
 461         commit)
 462                 # If the tagged object is a commit, then we assume this is a
 463                 # release, and so we calculate which tag this tag is replacing
 464                 prevtag=$(git describe --abbrev=0 $newrev^ 2>/dev/null)
 465
 466                 if [ -n "$prevtag" ]; then
 467                         echo "  replaces  $prevtag"
 468                 fi
 469                 ;;
 470         *)
 471                 echo "    length  $(git cat-file -s $tagobject) bytes"
 472                 ;;
 473         esac
 474         echo " tagged by  $tagger"
 475         echo "        on  $tagged"
 476
 477         echo ""
 478         echo $LOGBEGIN
 479
 480         # Show the content of the tag message; this might contain a change log
 481         # or release notes so is worth displaying.
 482         git cat-file tag $newrev | sed -e '1,/^$/d'
 483
 484         echo ""
 485         case "$tagtype" in
 486         commit)
 487                 # Only commit tags make sense to have rev-list operations performed
 488                 # on them
 489                 if [ -n "$prevtag" ]; then
 490                         # Show changes since the previous release
 491                         git rev-list --pretty=short "$prevtag..$newrev" | git shortlog
 492                 else
 493                         # No previous tag, show all the changes since time began
 494                         git rev-list --pretty=short $newrev | git shortlog
 495                 fi
 496                 ;;
 497         *)
 498                 # XXX: Is there anything useful we can do for non-commit objects?
 499                 ;;
 500         esac
 501
 502         echo $LOGEND
 503 }
 504
 505 #
 506 # Called for the deletion of an annotated tag
 507 #
 508 generate_delete_atag_email()
 509 {
 510         echo "       was  $oldrev"
 511         echo ""
 512         echo $LOGEND
 513         git show -s --pretty=oneline $oldrev
 514         echo $LOGEND
 515 }
 516
 517 # --------------- General references
 518
 519 #
 520 # Called when any other type of reference is created (most likely a
 521 # non-annotated tag)
 522 #
 523 generate_create_general_email()
 524 {
 525         echo "        at  $newrev ($newrev_type)"
 526
 527         generate_general_email
 528 }
 529
 530 #
 531 # Called when any other type of reference is updated (most likely a
 532 # non-annotated tag)
 533 #
 534 generate_update_general_email()
 535 {
 536         echo "        to  $newrev ($newrev_type)"
 537         echo "      from  $oldrev"
 538
 539         generate_general_email
 540 }
 541
 542 #
 543 # Called for creation or update of any other type of reference
 544 #
 545 generate_general_email()
 546 {
 547         # Unannotated tags are more about marking a point than releasing a version;
 548         # therefore we don't do the shortlog summary that we do for annotated tags
 549         # above - we simply show that the point has been marked, and print the log
 550         # message for the marked point for reference purposes
 551         #
 552         # Note this section also catches any other reference type (although there
 553         # aren't any) and deals with them in the same way.
 554
 555         echo ""
 556         if [ "$newrev_type" = "commit" ]; then
 557                 echo $LOGBEGIN
 558                 git show --no-color --root -s $newrev
 559                 echo $LOGEND
 560         else
 561                 # What can we do here?  The tag marks an object that is not a commit,
 562                 # so there is no log for us to display.  It's probably not wise to
 563                 # output git-cat-file as it could be a binary blob.  We'll just say how
 564                 # big it is
 565                 echo "$newrev is a $newrev_type, and is $(git cat-file -s $newrev) bytes long."
 566         fi
 567 }
 568
 569 #
 570 # Called for the deletion of any other type of reference
 571 #
 572 generate_delete_general_email()
 573 {
 574         echo "       was  $oldrev"
 575         echo ""
 576         echo $LOGEND
 577         git show -s --pretty=oneline $oldrev
 578         echo $LOGEND
 579 }
 580
 581 send_mail()
 582 {
 583         if [ -n "$envelopesender" ]; then
 584                 /usr/sbin/sendmail -t -f "$envelopesender"
 585         else
 586                 /usr/sbin/sendmail -t
 587         fi
 588 }
 589
 590 # ---------------------------- main()
 591
 592 # --- Constants
 593 EMAILPREFIX="[SCM] "
 594 LOGBEGIN="- Log -----------------------------------------------------------------"
 595 LOGEND="-----------------------------------------------------------------------"
 596
 597 # --- Config
 598 # Set GIT_DIR either from the working directory, or from the environment
 599 # variable.
 600 GIT_DIR=$(git rev-parse --git-dir 2>/dev/null)
 601 if [ -z "$GIT_DIR" ]; then
 602         echo >&2 "fatal: post-receive: GIT_DIR not set"
 603         exit 1
 604 fi
 605
 606 projectdesc=$(sed -ne '1p' "$GIT_DIR/description")
 607 # Check if the description is unchanged from it's default, and shorten it to a
 608 # more manageable length if it is
 609 if expr "$projectdesc" : "Unnamed repository.*$" >/dev/null
 610 then
 611         projectdesc="UNNAMED PROJECT"
 612 fi
 613
 614 recipients=$(git repo-config hooks.mailinglist)
 615 announcerecipients=$(git repo-config hooks.announcelist)
 616 envelopesender=$(git-repo-config hooks.envelopesender)
 617
 618 # --- Main loop
 619 # Allow dual mode: run from the command line just like the update hook, or if
 620 # no arguments are given then run as a hook script
 621 if [ -n "$1" -a -n "$2" -a -n "$3" ]; then
 622         # Output to the terminal in command line mode - if someone wanted to
 623         # resend an email; they could redirect the output to sendmail themselves
 624         PAGER= generate_email $2 $3 $1
 625 else
 626         while read oldrev newrev refname
 627         do
 628                 generate_email $oldrev $newrev $refname | send_mail
 629         done
 630 fi