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