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
   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.
   9 #
  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:
  15 #
  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
  19 #
  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
  24 # push.
  25 #
  26 # Config
  27 # ------
  28 # hooks.mailinglist
  29 #   This is the list that all pushes will go to; leave it blank to not send
  30 #   emails for every ref update.
  31 # hooks.announcelist
  32 #   This is the list that all pushes of annotated tags will go to.  Leave it
  33 #   blank to default to the mailinglist field.  The announce emails lists
  34 #   the short log summary of the changes since the last annotated tag.
  35 # hooks.envelopesender
  36 #   If set then the -f option is passed to sendmail to allow the envelope
  37 #   sender address to be set
  38 # hooks.emailprefix
  39 #   All emails have their subjects prefixed with this prefix, or "[SCM]"
  40 #   if emailprefix is unset, to aid filtering
  41 # hooks.showrev
  42 #   The shell command used to format each revision in the email, with
  43 #   "%s" replaced with the commit id.  Defaults to "git rev-list -1
  44 #   --pretty %s", displaying the commit id, author, date and log
  45 #   message.  To list full patches separated by a blank line, you
  46 #   could set this to "git show -C %s; echo".
  47 #
  48 # Notes
  49 # -----
  50 # All emails include the headers "X-Git-Refname", "X-Git-Oldrev",
  51 # "X-Git-Newrev", and "X-Git-Reftype" to enable fine tuned filtering and
  52 # give information for debugging.
  53 #
  54
  55 # ---------------------------- Functions
  56
  57 #
  58 # Top level email generation function.  This decides what type of update
  59 # this is and calls the appropriate body-generation routine after outputting
  60 # the common header
  61 #
  62 # Note this function doesn't actually generate any email output, that is
  63 # taken care of by the functions it calls:
  64 #  - generate_email_header
  65 #  - generate_create_XXXX_email
  66 #  - generate_update_XXXX_email
  67 #  - generate_delete_XXXX_email
  68 #  - generate_email_footer
  69 #
  70 generate_email()
  71 {
  72         # --- Arguments
  73         oldrev=$(git rev-parse $1)
  74         newrev=$(git rev-parse $2)
  75         refname="$3"
  76
  77         # --- Interpret
  78         # 0000->1234 (create)
  79         # 1234->2345 (update)
  80         # 2345->0000 (delete)
  81         if expr "$oldrev" : '0*$' >/dev/null
  82         then
  83                 change_type="create"
  84         else
  85                 if expr "$newrev" : '0*$' >/dev/null
  86                 then
  87                         change_type="delete"
  88                 else
  89                         change_type="update"
  90                 fi
  91         fi
  92
  93         # --- Get the revision types
  94         newrev_type=$(git cat-file -t $newrev 2> /dev/null)
  95         oldrev_type=$(git cat-file -t "$oldrev" 2> /dev/null)
  96         case "$change_type" in
  97         create|update)
  98                 rev="$newrev"
  99                 rev_type="$newrev_type"
 100                 ;;
 101         delete)
 102                 rev="$oldrev"
 103                 rev_type="$oldrev_type"
 104                 ;;
 105         esac
 106
 107         # The revision type tells us what type the commit is, combined with
 108         # the location of the ref we can decide between
 109         #  - working branch
 110         #  - tracking branch
 111         #  - unannoted tag
 112         #  - annotated tag
 113         case "$refname","$rev_type" in
 114                 refs/tags/*,commit)
 115                         # un-annotated tag
 116                         refname_type="tag"
 117                         short_refname=${refname##refs/tags/}
 118                         ;;
 119                 refs/tags/*,tag)
 120                         # annotated tag
 121                         refname_type="annotated tag"
 122                         short_refname=${refname##refs/tags/}
 123                         # change recipients
 124                         if [ -n "$announcerecipients" ]; then
 125                                 recipients="$announcerecipients"
 126                         fi
 127                         ;;
 128                 refs/heads/*,commit)
 129                         # branch
 130                         refname_type="branch"
 131                         short_refname=${refname##refs/heads/}
 132                         ;;
 133                 refs/remotes/*,commit)
 134                         # tracking branch
 135                         refname_type="tracking branch"
 136                         short_refname=${refname##refs/remotes/}
 137                         echo >&2 "*** Push-update of tracking branch, $refname"
 138                         echo >&2 "***  - no email generated."
 139                         exit 0
 140                         ;;
 141                 *)
 142                         # Anything else (is there anything else?)
 143                         echo >&2 "*** Unknown type of update to $refname ($rev_type)"
 144                         echo >&2 "***  - no email generated"
 145                         exit 1
 146                         ;;
 147         esac
 148
 149         # Check if we've got anyone to send to
 150         if [ -z "$recipients" ]; then
 151                 case "$refname_type" in
 152                         "annotated tag")
 153                                 config_name="hooks.announcelist"
 154                                 ;;
 155                         *)
 156                                 config_name="hooks.mailinglist"
 157                                 ;;
 158                 esac
 159                 echo >&2 "*** $config_name is not set so no email will be sent"
 160                 echo >&2 "*** for $refname update $oldrev->$newrev"
 161                 exit 0
 162         fi
 163
 164         # Email parameters
 165         # The email subject will contain the best description of the ref
 166         # that we can build from the parameters
 167         describe=$(git describe $rev 2>/dev/null)
 168         if [ -z "$describe" ]; then
 169                 describe=$rev
 170         fi
 171
 172         generate_email_header
 173
 174         # Call the correct body generation function
 175         fn_name=general
 176         case "$refname_type" in
 177         "tracking branch"|branch)
 178                 fn_name=branch
 179                 ;;
 180         "annotated tag")
 181                 fn_name=atag
 182                 ;;
 183         esac
 184         generate_${change_type}_${fn_name}_email
 185
 186         generate_email_footer
 187 }
 188
 189 generate_email_header()
 190 {
 191         # --- Email (all stdout will be the email)
 192         # Generate header
 193         cat <<-EOF
 194         To: $recipients
 195         Subject: ${emailprefix}$projectdesc $refname_type, $short_refname, ${change_type}d. $describe
 196         X-Git-Refname: $refname
 197         X-Git-Reftype: $refname_type
 198         X-Git-Oldrev: $oldrev
 199         X-Git-Newrev: $newrev
 200
 201         This is an automated email from the git hooks/post-receive script. It was
 202         generated because a ref change was pushed to the repository containing
 203         the project "$projectdesc".
 204
 205         The $refname_type, $short_refname has been ${change_type}d
 206         EOF
 207 }
 208
 209 generate_email_footer()
 210 {
 211         SPACE=" "
 212         cat <<-EOF
 213
 214
 215         hooks/post-receive
 216         --${SPACE}
 217         $projectdesc
 218         EOF
 219 }
 220
 221 # --------------- Branches
 222
 223 #
 224 # Called for the creation of a branch
 225 #
 226 generate_create_branch_email()
 227 {
 228         # This is a new branch and so oldrev is not valid
 229         echo "        at  $newrev ($newrev_type)"
 230         echo ""
 231
 232         echo $LOGBEGIN
 233         show_new_revisions
 234         echo $LOGEND
 235 }
 236
 237 #
 238 # Called for the change of a pre-existing branch
 239 #
 240 generate_update_branch_email()
 241 {
 242         # Consider this:
 243         #   1 --- 2 --- O --- X --- 3 --- 4 --- N
 244         #
 245         # O is $oldrev for $refname
 246         # N is $newrev for $refname
 247         # X is a revision pointed to by some other ref, for which we may
 248         #   assume that an email has already been generated.
 249         # In this case we want to issue an email containing only revisions
 250         # 3, 4, and N.  Given (almost) by
 251         #
 252         #  git rev-list N ^O --not --all
 253         #
 254         # The reason for the "almost", is that the "--not --all" will take
 255         # precedence over the "N", and effectively will translate to
 256         #
 257         #  git rev-list N ^O ^X ^N
 258         #
 259         # So, we need to build up the list more carefully.  git rev-parse
 260         # will generate a list of revs that may be fed into git rev-list.
 261         # We can get it to make the "--not --all" part and then filter out
 262         # the "^N" with:
 263         #
 264         #  git rev-parse --not --all | grep -v N
 265         #
 266         # Then, using the --stdin switch to git rev-list we have effectively
 267         # manufactured
 268         #
 269         #  git rev-list N ^O ^X
 270         #
 271         # This leaves a problem when someone else updates the repository
 272         # while this script is running.  Their new value of the ref we're
 273         # working on would be included in the "--not --all" output; and as
 274         # our $newrev would be an ancestor of that commit, it would exclude
 275         # all of our commits.  What we really want is to exclude the current
 276         # value of $refname from the --not list, rather than N itself.  So:
 277         #
 278         #  git rev-parse --not --all | grep -v $(git rev-parse $refname)
 279         #
 280         # Get's us to something pretty safe (apart from the small time
 281         # between refname being read, and git rev-parse running - for that,
 282         # I give up)
 283         #
 284         #
 285         # Next problem, consider this:
 286         #   * --- B --- * --- O ($oldrev)
 287         #          \
 288         #           * --- X --- * --- N ($newrev)
 289         #
 290         # That is to say, there is no guarantee that oldrev is a strict
 291         # subset of newrev (it would have required a --force, but that's
 292         # allowed).  So, we can't simply say rev-list $oldrev..$newrev.
 293         # Instead we find the common base of the two revs and list from
 294         # there.
 295         #
 296         # As above, we need to take into account the presence of X; if
 297         # another branch is already in the repository and points at some of
 298         # the revisions that we are about to output - we don't want them.
 299         # The solution is as before: git rev-parse output filtered.
 300         #
 301         # Finally, tags: 1 --- 2 --- O --- T --- 3 --- 4 --- N
 302         #
 303         # Tags pushed into the repository generate nice shortlog emails that
 304         # summarise the commits between them and the previous tag.  However,
 305         # those emails don't include the full commit messages that we output
 306         # for a branch update.  Therefore we still want to output revisions
 307         # that have been output on a tag email.
 308         #
 309         # Luckily, git rev-parse includes just the tool.  Instead of using
 310         # "--all" we use "--branches"; this has the added benefit that
 311         # "remotes/" will be ignored as well.
 312
 313         # List all of the revisions that were removed by this update, in a
 314         # fast forward update, this list will be empty, because rev-list O
 315         # ^N is empty.  For a non fast forward, O ^N is the list of removed
 316         # revisions
 317         fast_forward=""
 318         rev=""
 319         for rev in $(git rev-list $newrev..$oldrev)
 320         do
 321                 revtype=$(git cat-file -t "$rev")
 322                 echo "  discards  $rev ($revtype)"
 323         done
 324         if [ -z "$rev" ]; then
 325                 fast_forward=1
 326         fi
 327
 328         # List all the revisions from baserev to newrev in a kind of
 329         # "table-of-contents"; note this list can include revisions that
 330         # have already had notification emails and is present to show the
 331         # full detail of the change from rolling back the old revision to
 332         # the base revision and then forward to the new revision
 333         for rev in $(git rev-list $oldrev..$newrev)
 334         do
 335                 revtype=$(git cat-file -t "$rev")
 336                 echo "       via  $rev ($revtype)"
 337         done
 338
 339         if [ "$fast_forward" ]; then
 340                 echo "      from  $oldrev ($oldrev_type)"
 341         else
 342                 #  1. Existing revisions were removed.  In this case newrev
 343                 #     is a subset of oldrev - this is the reverse of a
 344                 #     fast-forward, a rewind
 345                 #  2. New revisions were added on top of an old revision,
 346                 #     this is a rewind and addition.
 347
 348                 # (1) certainly happened, (2) possibly.  When (2) hasn't
 349                 # happened, we set a flag to indicate that no log printout
 350                 # is required.
 351
 352                 echo ""
 353
 354                 # Find the common ancestor of the old and new revisions and
 355                 # compare it with newrev
 356                 baserev=$(git merge-base $oldrev $newrev)
 357                 rewind_only=""
 358                 if [ "$baserev" = "$newrev" ]; then
 359                         echo "This update discarded existing revisions and left the branch pointing at"
 360                         echo "a previous point in the repository history."
 361                         echo ""
 362                         echo " * -- * -- N ($newrev)"
 363                         echo "            \\"
 364                         echo "             O -- O -- O ($oldrev)"
 365                         echo ""
 366                         echo "The removed revisions are not necessarilly gone - if another reference"
 367                         echo "still refers to them they will stay in the repository."
 368                         rewind_only=1
 369                 else
 370                         echo "This update added new revisions after undoing existing revisions.  That is"
 371                         echo "to say, the old revision is not a strict subset of the new revision.  This"
 372                         echo "situation occurs when you --force push a change and generate a repository"
 373                         echo "containing something like this:"
 374                         echo ""
 375                         echo " * -- * -- B -- O -- O -- O ($oldrev)"
 376                         echo "            \\"
 377                         echo "             N -- N -- N ($newrev)"
 378                         echo ""
 379                         echo "When this happens we assume that you've already had alert emails for all"
 380                         echo "of the O revisions, and so we here report only the revisions in the N"
 381                         echo "branch from the common base, B."
 382                 fi
 383         fi
 384
 385         echo ""
 386         if [ -z "$rewind_only" ]; then
 387                 echo "Those revisions listed above that are new to this repository have"
 388                 echo "not appeared on any other notification email; so we list those"
 389                 echo "revisions in full, below."
 390
 391                 echo ""
 392                 echo $LOGBEGIN
 393                 show_new_revisions
 394
 395                 # XXX: Need a way of detecting whether git rev-list actually
 396                 # outputted anything, so that we can issue a "no new
 397                 # revisions added by this update" message
 398
 399                 echo $LOGEND
 400         else
 401                 echo "No new revisions were added by this update."
 402         fi
 403
 404         # The diffstat is shown from the old revision to the new revision.
 405         # This is to show the truth of what happened in this change.
 406         # There's no point showing the stat from the base to the new
 407         # revision because the base is effectively a random revision at this
 408         # point - the user will be interested in what this revision changed
 409         # - including the undoing of previous revisions in the case of
 410         # non-fast forward updates.
 411         echo ""
 412         echo "Summary of changes:"
 413         git diff-tree --stat --summary --find-copies-harder $oldrev..$newrev
 414 }
 415
 416 #
 417 # Called for the deletion of a branch
 418 #
 419 generate_delete_branch_email()
 420 {
 421         echo "       was  $oldrev"
 422         echo ""
 423         echo $LOGEND
 424         git show -s --pretty=oneline $oldrev
 425         echo $LOGEND
 426 }
 427
 428 # --------------- Annotated tags
 429
 430 #
 431 # Called for the creation of an annotated tag
 432 #
 433 generate_create_atag_email()
 434 {
 435         echo "        at  $newrev ($newrev_type)"
 436
 437         generate_atag_email
 438 }
 439
 440 #
 441 # Called for the update of an annotated tag (this is probably a rare event
 442 # and may not even be allowed)
 443 #
 444 generate_update_atag_email()
 445 {
 446         echo "        to  $newrev ($newrev_type)"
 447         echo "      from  $oldrev (which is now obsolete)"
 448
 449         generate_atag_email
 450 }
 451
 452 #
 453 # Called when an annotated tag is created or changed
 454 #
 455 generate_atag_email()
 456 {
 457         # Use git for-each-ref to pull out the individual fields from the
 458         # tag
 459         eval $(git for-each-ref --shell --format='
 460         tagobject=%(*objectname)
 461         tagtype=%(*objecttype)
 462         tagger=%(taggername)
 463         tagged=%(taggerdate)' $refname
 464         )
 465
 466         echo "   tagging  $tagobject ($tagtype)"
 467         case "$tagtype" in
 468         commit)
 469
 470                 # If the tagged object is a commit, then we assume this is a
 471                 # release, and so we calculate which tag this tag is
 472                 # replacing
 473                 prevtag=$(git describe --abbrev=0 $newrev^ 2>/dev/null)
 474
 475                 if [ -n "$prevtag" ]; then
 476                         echo "  replaces  $prevtag"
 477                 fi
 478                 ;;
 479         *)
 480                 echo "    length  $(git cat-file -s $tagobject) bytes"
 481                 ;;
 482         esac
 483         echo " tagged by  $tagger"
 484         echo "        on  $tagged"
 485
 486         echo ""
 487         echo $LOGBEGIN
 488
 489         # Show the content of the tag message; this might contain a change
 490         # log or release notes so is worth displaying.
 491         git cat-file tag $newrev | sed -e '1,/^$/d'
 492
 493         echo ""
 494         case "$tagtype" in
 495         commit)
 496                 # Only commit tags make sense to have rev-list operations
 497                 # performed on them
 498                 if [ -n "$prevtag" ]; then
 499                         # Show changes since the previous release
 500                         git rev-list --pretty=short "$prevtag..$newrev" | git shortlog
 501                 else
 502                         # No previous tag, show all the changes since time
 503                         # began
 504                         git rev-list --pretty=short $newrev | git shortlog
 505                 fi
 506                 ;;
 507         *)
 508                 # XXX: Is there anything useful we can do for non-commit
 509                 # objects?
 510                 ;;
 511         esac
 512
 513         echo $LOGEND
 514 }
 515
 516 #
 517 # Called for the deletion of an annotated tag
 518 #
 519 generate_delete_atag_email()
 520 {
 521         echo "       was  $oldrev"
 522         echo ""
 523         echo $LOGEND
 524         git show -s --pretty=oneline $oldrev
 525         echo $LOGEND
 526 }
 527
 528 # --------------- General references
 529
 530 #
 531 # Called when any other type of reference is created (most likely a
 532 # non-annotated tag)
 533 #
 534 generate_create_general_email()
 535 {
 536         echo "        at  $newrev ($newrev_type)"
 537
 538         generate_general_email
 539 }
 540
 541 #
 542 # Called when any other type of reference is updated (most likely a
 543 # non-annotated tag)
 544 #
 545 generate_update_general_email()
 546 {
 547         echo "        to  $newrev ($newrev_type)"
 548         echo "      from  $oldrev"
 549
 550         generate_general_email
 551 }
 552
 553 #
 554 # Called for creation or update of any other type of reference
 555 #
 556 generate_general_email()
 557 {
 558         # Unannotated tags are more about marking a point than releasing a
 559         # version; therefore we don't do the shortlog summary that we do for
 560         # annotated tags above - we simply show that the point has been
 561         # marked, and print the log message for the marked point for
 562         # reference purposes
 563         #
 564         # Note this section also catches any other reference type (although
 565         # there aren't any) and deals with them in the same way.
 566
 567         echo ""
 568         if [ "$newrev_type" = "commit" ]; then
 569                 echo $LOGBEGIN
 570                 git show --no-color --root -s --pretty=medium $newrev
 571                 echo $LOGEND
 572         else
 573                 # What can we do here?  The tag marks an object that is not
 574                 # a commit, so there is no log for us to display.  It's
 575                 # probably not wise to output git cat-file as it could be a
 576                 # binary blob.  We'll just say how big it is
 577                 echo "$newrev is a $newrev_type, and is $(git cat-file -s $newrev) bytes long."
 578         fi
 579 }
 580
 581 #
 582 # Called for the deletion of any other type of reference
 583 #
 584 generate_delete_general_email()
 585 {
 586         echo "       was  $oldrev"
 587         echo ""
 588         echo $LOGEND
 589         git show -s --pretty=oneline $oldrev
 590         echo $LOGEND
 591 }
 592
 593
 594 # --------------- Miscellaneous utilities
 595
 596 #
 597 # Show new revisions as the user would like to see them in the email.
 598 #
 599 show_new_revisions()
 600 {
 601         # This shows all log entries that are not already covered by
 602         # another ref - i.e. commits that are now accessible from this
 603         # ref that were previously not accessible
 604         # (see generate_update_branch_email for the explanation of this
 605         # command)
 606
 607         # Revision range passed to rev-list differs for new vs. updated
 608         # branches.
 609         if [ "$change_type" = create ]
 610         then
 611                 # Show all revisions exclusive to this (new) branch.
 612                 revspec=$newrev
 613         else
 614                 # Branch update; show revisions not part of $oldrev.
 615                 revspec=$oldrev..$newrev
 616         fi
 617
 618         other_branches=$(git for-each-ref --format='%(refname)' refs/heads/ |
 619             grep -F -v $refname)
 620         git rev-parse --not $other_branches |
 621         if [ -z "$custom_showrev" ]
 622         then
 623                 git rev-list --pretty --stdin $revspec
 624         else
 625                 git rev-list --stdin $revspec |
 626                 while read onerev
 627                 do
 628                         eval $(printf "$custom_showrev" $onerev)
 629                 done
 630         fi
 631 }
 632
 633
 634 send_mail()
 635 {
 636         if [ -n "$envelopesender" ]; then
 637                 /usr/sbin/sendmail -t -f "$envelopesender"
 638         else
 639                 /usr/sbin/sendmail -t
 640         fi
 641 }
 642
 643 # ---------------------------- main()
 644
 645 # --- Constants
 646 LOGBEGIN="- Log -----------------------------------------------------------------"
 647 LOGEND="-----------------------------------------------------------------------"
 648
 649 # --- Config
 650 # Set GIT_DIR either from the working directory, or from the environment
 651 # variable.
 652 GIT_DIR=$(git rev-parse --git-dir 2>/dev/null)
 653 if [ -z "$GIT_DIR" ]; then
 654         echo >&2 "fatal: post-receive: GIT_DIR not set"
 655         exit 1
 656 fi
 657
 658 projectdesc=$(sed -ne '1p' "$GIT_DIR/description")
 659 # Check if the description is unchanged from it's default, and shorten it to
 660 # a more manageable length if it is
 661 if expr "$projectdesc" : "Unnamed repository.*$" >/dev/null
 662 then
 663         projectdesc="UNNAMED PROJECT"
 664 fi
 665
 666 recipients=$(git config hooks.mailinglist)
 667 announcerecipients=$(git config hooks.announcelist)
 668 envelopesender=$(git config hooks.envelopesender)
 669 emailprefix=$(git config hooks.emailprefix || echo '[SCM] ')
 670 custom_showrev=$(git config hooks.showrev)
 671
 672 # --- Main loop
 673 # Allow dual mode: run from the command line just like the update hook, or
 674 # if no arguments are given then run as a hook script
 675 if [ -n "$1" -a -n "$2" -a -n "$3" ]; then
 676         # Output to the terminal in command line mode - if someone wanted to
 677         # resend an email; they could redirect the output to sendmail
 678         # themselves
 679         PAGER= generate_email $2 $3 $1
 680 else
 681         while read oldrev newrev refname
 682         do
 683                 generate_email $oldrev $newrev $refname | send_mail
 684         done
 685 fi