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 # 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
  31 # wanted.
  32 #
  33 # Config
  34 # ------
  35 # hooks.mailinglist
  36 #   This is the list that all pushes will go to; leave it blank to not send
  37 #   emails for every ref update.
  38 # hooks.announcelist
  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
  45 # hooks.emailprefix
  46 #   All emails have their subjects prefixed with this prefix, or "[SCM]"
  47 #   if emailprefix is unset, to aid filtering
  48 # hooks.showrev
  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"
  57 #   or printf.
  58 #
  59 # Notes
  60 # -----
  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.
  64 #
  65
  66 # ---------------------------- Functions
  67
  68 #
  69 # Top level email generation function.  This decides what type of update
  70 # this is and calls the appropriate body-generation routine after outputting
  71 # the common header
  72 #
  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
  80 #
  81 generate_email()
  82 {
  83         # --- Arguments
  84         oldrev=$(git rev-parse $1)
  85         newrev=$(git rev-parse $2)
  86         refname="$3"
  87
  88         # --- Interpret
  89         # 0000->1234 (create)
  90         # 1234->2345 (update)
  91         # 2345->0000 (delete)
  92         if expr "$oldrev" : '0*$' >/dev/null
  93         then
  94                 change_type="create"
  95         else
  96                 if expr "$newrev" : '0*$' >/dev/null
  97                 then
  98                         change_type="delete"
  99                 else
 100                         change_type="update"
 101                 fi
 102         fi
 103
 104         # --- Get the revision types
 105         newrev_type=$(git cat-file -t $newrev 2> /dev/null)
 106         oldrev_type=$(git cat-file -t "$oldrev" 2> /dev/null)
 107         case "$change_type" in
 108         create|update)
 109                 rev="$newrev"
 110                 rev_type="$newrev_type"
 111                 ;;
 112         delete)
 113                 rev="$oldrev"
 114                 rev_type="$oldrev_type"
 115                 ;;
 116         esac
 117
 118         # The revision type tells us what type the commit is, combined with
 119         # the location of the ref we can decide between
 120         #  - working branch
 121         #  - tracking branch
 122         #  - unannoted tag
 123         #  - annotated tag
 124         case "$refname","$rev_type" in
 125                 refs/tags/*,commit)
 126                         # un-annotated tag
 127                         refname_type="tag"
 128                         short_refname=${refname##refs/tags/}
 129                         ;;
 130                 refs/tags/*,tag)
 131                         # annotated tag
 132                         refname_type="annotated tag"
 133                         short_refname=${refname##refs/tags/}
 134                         # change recipients
 135                         if [ -n "$announcerecipients" ]; then
 136                                 recipients="$announcerecipients"
 137                         fi
 138                         ;;
 139                 refs/heads/*,commit)
 140                         # branch
 141                         refname_type="branch"
 142                         short_refname=${refname##refs/heads/}
 143                         ;;
 144                 refs/remotes/*,commit)
 145                         # tracking branch
 146                         refname_type="tracking branch"
 147                         short_refname=${refname##refs/remotes/}
 148                         echo >&2 "*** Push-update of tracking branch, $refname"
 149                         echo >&2 "***  - no email generated."
 150                         exit 0
 151                         ;;
 152                 *)
 153                         # Anything else (is there anything else?)
 154                         echo >&2 "*** Unknown type of update to $refname ($rev_type)"
 155                         echo >&2 "***  - no email generated"
 156                         exit 1
 157                         ;;
 158         esac
 159
 160         # Check if we've got anyone to send to
 161         if [ -z "$recipients" ]; then
 162                 case "$refname_type" in
 163                         "annotated tag")
 164                                 config_name="hooks.announcelist"
 165                                 ;;
 166                         *)
 167                                 config_name="hooks.mailinglist"
 168                                 ;;
 169                 esac
 170                 echo >&2 "*** $config_name is not set so no email will be sent"
 171                 echo >&2 "*** for $refname update $oldrev->$newrev"
 172                 exit 0
 173         fi
 174
 175         # Email parameters
 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
 180                 describe=$rev
 181         fi
 182
 183         generate_email_header
 184
 185         # Call the correct body generation function
 186         fn_name=general
 187         case "$refname_type" in
 188         "tracking branch"|branch)
 189                 fn_name=branch
 190                 ;;
 191         "annotated tag")
 192                 fn_name=atag
 193                 ;;
 194         esac
 195         generate_${change_type}_${fn_name}_email
 196
 197         generate_email_footer
 198 }
 199
 200 generate_email_header()
 201 {
 202         # --- Email (all stdout will be the email)
 203         # Generate header
 204         cat <<-EOF
 205         To: $recipients
 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: $newrev
 211
 212         This is an automated email from the git hooks/post-receive script. It was
 213         generated because a ref change was pushed to the repository containing
 214         the project "$projectdesc".
 215
 216         The $refname_type, $short_refname has been ${change_type}d
 217         EOF
 218 }
 219
 220 generate_email_footer()
 221 {
 222         SPACE=" "
 223         cat <<-EOF
 224
 225
 226         hooks/post-receive
 227         --${SPACE}
 228         $projectdesc
 229         EOF
 230 }
 231
 232 # --------------- Branches
 233
 234 #
 235 # Called for the creation of a branch
 236 #
 237 generate_create_branch_email()
 238 {
 239         # This is a new branch and so oldrev is not valid
 240         echo "        at  $newrev ($newrev_type)"
 241         echo ""
 242
 243         echo $LOGBEGIN
 244         show_new_revisions
 245         echo $LOGEND
 246 }
 247
 248 #
 249 # Called for the change of a pre-existing branch
 250 #
 251 generate_update_branch_email()
 252 {
 253         # Consider this:
 254         #   1 --- 2 --- O --- X --- 3 --- 4 --- N
 255         #
 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
 262         #
 263         #  git rev-list N ^O --not --all
 264         #
 265         # The reason for the "almost", is that the "--not --all" will take
 266         # precedence over the "N", and effectively will translate to
 267         #
 268         #  git rev-list N ^O ^X ^N
 269         #
 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
 273         # the "^N" with:
 274         #
 275         #  git rev-parse --not --all | grep -v N
 276         #
 277         # Then, using the --stdin switch to git rev-list we have effectively
 278         # manufactured
 279         #
 280         #  git rev-list N ^O ^X
 281         #
 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:
 288         #
 289         #  git rev-parse --not --all | grep -v $(git rev-parse $refname)
 290         #
 291         # Get's us to something pretty safe (apart from the small time
 292         # between refname being read, and git rev-parse running - for that,
 293         # I give up)
 294         #
 295         #
 296         # Next problem, consider this:
 297         #   * --- B --- * --- O ($oldrev)
 298         #          \
 299         #           * --- X --- * --- N ($newrev)
 300         #
 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
 305         # there.
 306         #
 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.
 311         #
 312         # Finally, tags: 1 --- 2 --- O --- T --- 3 --- 4 --- N
 313         #
 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.
 319         #
 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.
 323
 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
 327         # revisions
 328         fast_forward=""
 329         rev=""
 330         for rev in $(git rev-list $newrev..$oldrev)
 331         do
 332                 revtype=$(git cat-file -t "$rev")
 333                 echo "  discards  $rev ($revtype)"
 334         done
 335         if [ -z "$rev" ]; then
 336                 fast_forward=1
 337         fi
 338
 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)
 345         do
 346                 revtype=$(git cat-file -t "$rev")
 347                 echo "       via  $rev ($revtype)"
 348         done
 349
 350         if [ "$fast_forward" ]; then
 351                 echo "      from  $oldrev ($oldrev_type)"
 352         else
 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.
 358
 359                 # (1) certainly happened, (2) possibly.  When (2) hasn't
 360                 # happened, we set a flag to indicate that no log printout
 361                 # is required.
 362
 363                 echo ""
 364
 365                 # Find the common ancestor of the old and new revisions and
 366                 # compare it with newrev
 367                 baserev=$(git merge-base $oldrev $newrev)
 368                 rewind_only=""
 369                 if [ "$baserev" = "$newrev" ]; then
 370                         echo "This update discarded existing revisions and left the branch pointing at"
 371                         echo "a previous point in the repository history."
 372                         echo ""
 373                         echo " * -- * -- N ($newrev)"
 374                         echo "            \\"
 375                         echo "             O -- O -- O ($oldrev)"
 376                         echo ""
 377                         echo "The removed revisions are not necessarilly gone - if another reference"
 378                         echo "still refers to them they will stay in the repository."
 379                         rewind_only=1
 380                 else
 381                         echo "This update added new revisions after undoing existing revisions.  That is"
 382                         echo "to say, the old revision is not a strict subset of the new revision.  This"
 383                         echo "situation occurs when you --force push a change and generate a repository"
 384                         echo "containing something like this:"
 385                         echo ""
 386                         echo " * -- * -- B -- O -- O -- O ($oldrev)"
 387                         echo "            \\"
 388                         echo "             N -- N -- N ($newrev)"
 389                         echo ""
 390                         echo "When this happens we assume that you've already had alert emails for all"
 391                         echo "of the O revisions, and so we here report only the revisions in the N"
 392                         echo "branch from the common base, B."
 393                 fi
 394         fi
 395
 396         echo ""
 397         if [ -z "$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."
 401
 402                 echo ""
 403                 echo $LOGBEGIN
 404                 show_new_revisions
 405
 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
 409
 410                 echo $LOGEND
 411         else
 412                 echo "No new revisions were added by this update."
 413         fi
 414
 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.
 422         echo ""
 423         echo "Summary of changes:"
 424         git diff-tree --stat --summary --find-copies-harder $oldrev..$newrev
 425 }
 426
 427 #
 428 # Called for the deletion of a branch
 429 #
 430 generate_delete_branch_email()
 431 {
 432         echo "       was  $oldrev"
 433         echo ""
 434         echo $LOGEND
 435         git show -s --pretty=oneline $oldrev
 436         echo $LOGEND
 437 }
 438
 439 # --------------- Annotated tags
 440
 441 #
 442 # Called for the creation of an annotated tag
 443 #
 444 generate_create_atag_email()
 445 {
 446         echo "        at  $newrev ($newrev_type)"
 447
 448         generate_atag_email
 449 }
 450
 451 #
 452 # Called for the update of an annotated tag (this is probably a rare event
 453 # and may not even be allowed)
 454 #
 455 generate_update_atag_email()
 456 {
 457         echo "        to  $newrev ($newrev_type)"
 458         echo "      from  $oldrev (which is now obsolete)"
 459
 460         generate_atag_email
 461 }
 462
 463 #
 464 # Called when an annotated tag is created or changed
 465 #
 466 generate_atag_email()
 467 {
 468         # Use git for-each-ref to pull out the individual fields from the
 469         # tag
 470         eval $(git for-each-ref --shell --format='
 471         tagobject=%(*objectname)
 472         tagtype=%(*objecttype)
 473         tagger=%(taggername)
 474         tagged=%(taggerdate)' $refname
 475         )
 476
 477         echo "   tagging  $tagobject ($tagtype)"
 478         case "$tagtype" in
 479         commit)
 480
 481                 # If the tagged object is a commit, then we assume this is a
 482                 # release, and so we calculate which tag this tag is
 483                 # replacing
 484                 prevtag=$(git describe --abbrev=0 $newrev^ 2>/dev/null)
 485
 486                 if [ -n "$prevtag" ]; then
 487                         echo "  replaces  $prevtag"
 488                 fi
 489                 ;;
 490         *)
 491                 echo "    length  $(git cat-file -s $tagobject) bytes"
 492                 ;;
 493         esac
 494         echo " tagged by  $tagger"
 495         echo "        on  $tagged"
 496
 497         echo ""
 498         echo $LOGBEGIN
 499
 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'
 503
 504         echo ""
 505         case "$tagtype" in
 506         commit)
 507                 # Only commit tags make sense to have rev-list operations
 508                 # performed on them
 509                 if [ -n "$prevtag" ]; then
 510                         # Show changes since the previous release
 511                         git rev-list --pretty=short "$prevtag..$newrev" | git shortlog
 512                 else
 513                         # No previous tag, show all the changes since time
 514                         # began
 515                         git rev-list --pretty=short $newrev | git shortlog
 516                 fi
 517                 ;;
 518         *)
 519                 # XXX: Is there anything useful we can do for non-commit
 520                 # objects?
 521                 ;;
 522         esac
 523
 524         echo $LOGEND
 525 }
 526
 527 #
 528 # Called for the deletion of an annotated tag
 529 #
 530 generate_delete_atag_email()
 531 {
 532         echo "       was  $oldrev"
 533         echo ""
 534         echo $LOGEND
 535         git show -s --pretty=oneline $oldrev
 536         echo $LOGEND
 537 }
 538
 539 # --------------- General references
 540
 541 #
 542 # Called when any other type of reference is created (most likely a
 543 # non-annotated tag)
 544 #
 545 generate_create_general_email()
 546 {
 547         echo "        at  $newrev ($newrev_type)"
 548
 549         generate_general_email
 550 }
 551
 552 #
 553 # Called when any other type of reference is updated (most likely a
 554 # non-annotated tag)
 555 #
 556 generate_update_general_email()
 557 {
 558         echo "        to  $newrev ($newrev_type)"
 559         echo "      from  $oldrev"
 560
 561         generate_general_email
 562 }
 563
 564 #
 565 # Called for creation or update of any other type of reference
 566 #
 567 generate_general_email()
 568 {
 569         # Unannotated tags are more about marking a point than releasing a
 570         # version; therefore we don't do the shortlog summary that we do for
 571         # annotated tags above - we simply show that the point has been
 572         # marked, and print the log message for the marked point for
 573         # reference purposes
 574         #
 575         # Note this section also catches any other reference type (although
 576         # there aren't any) and deals with them in the same way.
 577
 578         echo ""
 579         if [ "$newrev_type" = "commit" ]; then
 580                 echo $LOGBEGIN
 581                 git show --no-color --root -s --pretty=medium $newrev
 582                 echo $LOGEND
 583         else
 584                 # What can we do here?  The tag marks an object that is not
 585                 # a commit, so there is no log for us to display.  It's
 586                 # probably not wise to output git cat-file as it could be a
 587                 # binary blob.  We'll just say how big it is
 588                 echo "$newrev is a $newrev_type, and is $(git cat-file -s $newrev) bytes long."
 589         fi
 590 }
 591
 592 #
 593 # Called for the deletion of any other type of reference
 594 #
 595 generate_delete_general_email()
 596 {
 597         echo "       was  $oldrev"
 598         echo ""
 599         echo $LOGEND
 600         git show -s --pretty=oneline $oldrev
 601         echo $LOGEND
 602 }
 603
 604
 605 # --------------- Miscellaneous utilities
 606
 607 #
 608 # Show new revisions as the user would like to see them in the email.
 609 #
 610 show_new_revisions()
 611 {
 612         # This shows all log entries that are not already covered by
 613         # another ref - i.e. commits that are now accessible from this
 614         # ref that were previously not accessible
 615         # (see generate_update_branch_email for the explanation of this
 616         # command)
 617
 618         # Revision range passed to rev-list differs for new vs. updated
 619         # branches.
 620         if [ "$change_type" = create ]
 621         then
 622                 # Show all revisions exclusive to this (new) branch.
 623                 revspec=$newrev
 624         else
 625                 # Branch update; show revisions not part of $oldrev.
 626                 revspec=$oldrev..$newrev
 627         fi
 628
 629         other_branches=$(git for-each-ref --format='%(refname)' refs/heads/ |
 630             grep -F -v $refname)
 631         git rev-parse --not $other_branches |
 632         if [ -z "$custom_showrev" ]
 633         then
 634                 git rev-list --pretty --stdin $revspec
 635         else
 636                 git rev-list --stdin $revspec |
 637                 while read onerev
 638                 do
 639                         eval $(printf "$custom_showrev" $onerev)
 640                 done
 641         fi
 642 }
 643
 644
 645 send_mail()
 646 {
 647         if [ -n "$envelopesender" ]; then
 648                 /usr/sbin/sendmail -t -f "$envelopesender"
 649         else
 650                 /usr/sbin/sendmail -t
 651         fi
 652 }
 653
 654 # ---------------------------- main()
 655
 656 # --- Constants
 657 LOGBEGIN="- Log -----------------------------------------------------------------"
 658 LOGEND="-----------------------------------------------------------------------"
 659
 660 # --- Config
 661 # Set GIT_DIR either from the working directory, or from the environment
 662 # variable.
 663 GIT_DIR=$(git rev-parse --git-dir 2>/dev/null)
 664 if [ -z "$GIT_DIR" ]; then
 665         echo >&2 "fatal: post-receive: GIT_DIR not set"
 666         exit 1
 667 fi
 668
 669 projectdesc=$(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.*$" >/dev/null
 673 then
 674         projectdesc="UNNAMED PROJECT"
 675 fi
 676
 677 recipients=$(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)
 682
 683 # --- Main loop
 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
 689         # themselves
 690         PAGER= generate_email $2 $3 $1
 691 else
 692         while read oldrev newrev refname
 693         do
 694                 generate_email $oldrev $newrev $refname | send_mail
 695         done
 696 fi