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/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/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 # hooks.emailmaxlines
  59 #   The maximum number of lines that should be included in the generated
  60 #   email body. If not specified, there is no limit.
  61 #   Lines beyond the limit are suppressed and counted, and a final
  62 #   line is added indicating the number of suppressed lines.
  63 # hooks.diffopts
  64 #   Alternate options for the git diff-tree invocation that shows changes.
  65 #   Default is "--stat --summary --find-copies-harder". Add -p to those
  66 #   options to include a unified diff of changes in addition to the usual
  67 #   summary output.
  68 #
  69 # Notes
  70 # -----
  71 # All emails include the headers "X-Git-Refname", "X-Git-Oldrev",
  72 # "X-Git-Newrev", and "X-Git-Reftype" to enable fine tuned filtering and
  73 # give information for debugging.
  74 #
  75
  76 # ---------------------------- Functions
  77
  78 #
  79 # Function to prepare for email generation. This decides what type
  80 # of update this is and whether an email should even be generated.
  81 #
  82 prep_for_email()
  83 {
  84         # --- Arguments
  85         oldrev=$(git rev-parse $1)
  86         newrev=$(git rev-parse $2)
  87         refname="$3"
  88         maxlines=$4
  89
  90         # --- Interpret
  91         # 0000->1234 (create)
  92         # 1234->2345 (update)
  93         # 2345->0000 (delete)
  94         if expr "$oldrev" : '0*$' >/dev/null
  95         then
  96                 change_type="create"
  97         else
  98                 if expr "$newrev" : '0*$' >/dev/null
  99                 then
 100                         change_type="delete"
 101                 else
 102                         change_type="update"
 103                 fi
 104         fi
 105
 106         # --- Get the revision types
 107         newrev_type=$(git cat-file -t $newrev 2> /dev/null)
 108         oldrev_type=$(git cat-file -t "$oldrev" 2> /dev/null)
 109         case "$change_type" in
 110         create|update)
 111                 rev="$newrev"
 112                 rev_type="$newrev_type"
 113                 ;;
 114         delete)
 115                 rev="$oldrev"
 116                 rev_type="$oldrev_type"
 117                 ;;
 118         esac
 119
 120         # The revision type tells us what type the commit is, combined with
 121         # the location of the ref we can decide between
 122         #  - working branch
 123         #  - tracking branch
 124         #  - unannoted tag
 125         #  - annotated tag
 126         case "$refname","$rev_type" in
 127                 refs/tags/*,commit)
 128                         # un-annotated tag
 129                         refname_type="tag"
 130                         short_refname=${refname##refs/tags/}
 131                         ;;
 132                 refs/tags/*,tag)
 133                         # annotated tag
 134                         refname_type="annotated tag"
 135                         short_refname=${refname##refs/tags/}
 136                         # change recipients
 137                         if [ -n "$announcerecipients" ]; then
 138                                 recipients="$announcerecipients"
 139                         fi
 140                         ;;
 141                 refs/heads/*,commit)
 142                         # branch
 143                         refname_type="branch"
 144                         short_refname=${refname##refs/heads/}
 145                         ;;
 146                 refs/remotes/*,commit)
 147                         # tracking branch
 148                         refname_type="tracking branch"
 149                         short_refname=${refname##refs/remotes/}
 150                         echo >&2 "*** Push-update of tracking branch, $refname"
 151                         echo >&2 "***  - no email generated."
 152                         return 1
 153                         ;;
 154                 *)
 155                         # Anything else (is there anything else?)
 156                         echo >&2 "*** Unknown type of update to $refname ($rev_type)"
 157                         echo >&2 "***  - no email generated"
 158                         return 1
 159                         ;;
 160         esac
 161
 162         # Check if we've got anyone to send to
 163         if [ -z "$recipients" ]; then
 164                 case "$refname_type" in
 165                         "annotated tag")
 166                                 config_name="hooks.announcelist"
 167                                 ;;
 168                         *)
 169                                 config_name="hooks.mailinglist"
 170                                 ;;
 171                 esac
 172                 echo >&2 "*** $config_name is not set so no email will be sent"
 173                 echo >&2 "*** for $refname update $oldrev->$newrev"
 174                 return 1
 175         fi
 176
 177         return 0
 178 }
 179
 180 #
 181 # Top level email generation function.  This calls the appropriate
 182 # body-generation routine after outputting the common header.
 183 #
 184 # Note this function doesn't actually generate any email output, that is
 185 # taken care of by the functions it calls:
 186 #  - generate_email_header
 187 #  - generate_create_XXXX_email
 188 #  - generate_update_XXXX_email
 189 #  - generate_delete_XXXX_email
 190 #  - generate_email_footer
 191 #
 192 # Note also that this function cannot 'exit' from the script; when this
 193 # function is running (in hook script mode), the send_mail() function
 194 # is already executing in another process, connected via a pipe, and
 195 # if this function exits without, whatever has been generated to that
 196 # point will be sent as an email... even if nothing has been generated.
 197 #
 198 generate_email()
 199 {
 200         # Email parameters
 201         # The email subject will contain the best description of the ref
 202         # that we can build from the parameters
 203         describe=$(git describe $rev 2>/dev/null)
 204         if [ -z "$describe" ]; then
 205                 describe=$rev
 206         fi
 207
 208         generate_email_header
 209
 210         # Call the correct body generation function
 211         fn_name=general
 212         case "$refname_type" in
 213         "tracking branch"|branch)
 214                 fn_name=branch
 215                 ;;
 216         "annotated tag")
 217                 fn_name=atag
 218                 ;;
 219         esac
 220
 221         if [ -z "$maxlines" ]; then
 222                 generate_${change_type}_${fn_name}_email
 223         else
 224                 generate_${change_type}_${fn_name}_email | limit_lines $maxlines
 225         fi
 226
 227         generate_email_footer
 228 }
 229
 230 generate_email_header()
 231 {
 232         # --- Email (all stdout will be the email)
 233         # Generate header
 234         cat <<-EOF
 235         To: $recipients
 236         Subject: ${emailprefix}$projectdesc $refname_type $short_refname ${change_type}d. $describe
 237         X-Git-Refname: $refname
 238         X-Git-Reftype: $refname_type
 239         X-Git-Oldrev: $oldrev
 240         X-Git-Newrev: $newrev
 241
 242         This is an automated email from the git hooks/post-receive script. It was
 243         generated because a ref change was pushed to the repository containing
 244         the project "$projectdesc".
 245
 246         The $refname_type, $short_refname has been ${change_type}d
 247         EOF
 248 }
 249
 250 generate_email_footer()
 251 {
 252         SPACE=" "
 253         cat <<-EOF
 254
 255
 256         hooks/post-receive
 257         --${SPACE}
 258         $projectdesc
 259         EOF
 260 }
 261
 262 # --------------- Branches
 263
 264 #
 265 # Called for the creation of a branch
 266 #
 267 generate_create_branch_email()
 268 {
 269         # This is a new branch and so oldrev is not valid
 270         echo "        at  $newrev ($newrev_type)"
 271         echo ""
 272
 273         echo $LOGBEGIN
 274         show_new_revisions
 275         echo $LOGEND
 276 }
 277
 278 #
 279 # Called for the change of a pre-existing branch
 280 #
 281 generate_update_branch_email()
 282 {
 283         # Consider this:
 284         #   1 --- 2 --- O --- X --- 3 --- 4 --- N
 285         #
 286         # O is $oldrev for $refname
 287         # N is $newrev for $refname
 288         # X is a revision pointed to by some other ref, for which we may
 289         #   assume that an email has already been generated.
 290         # In this case we want to issue an email containing only revisions
 291         # 3, 4, and N.  Given (almost) by
 292         #
 293         #  git rev-list N ^O --not --all
 294         #
 295         # The reason for the "almost", is that the "--not --all" will take
 296         # precedence over the "N", and effectively will translate to
 297         #
 298         #  git rev-list N ^O ^X ^N
 299         #
 300         # So, we need to build up the list more carefully.  git rev-parse
 301         # will generate a list of revs that may be fed into git rev-list.
 302         # We can get it to make the "--not --all" part and then filter out
 303         # the "^N" with:
 304         #
 305         #  git rev-parse --not --all | grep -v N
 306         #
 307         # Then, using the --stdin switch to git rev-list we have effectively
 308         # manufactured
 309         #
 310         #  git rev-list N ^O ^X
 311         #
 312         # This leaves a problem when someone else updates the repository
 313         # while this script is running.  Their new value of the ref we're
 314         # working on would be included in the "--not --all" output; and as
 315         # our $newrev would be an ancestor of that commit, it would exclude
 316         # all of our commits.  What we really want is to exclude the current
 317         # value of $refname from the --not list, rather than N itself.  So:
 318         #
 319         #  git rev-parse --not --all | grep -v $(git rev-parse $refname)
 320         #
 321         # Get's us to something pretty safe (apart from the small time
 322         # between refname being read, and git rev-parse running - for that,
 323         # I give up)
 324         #
 325         #
 326         # Next problem, consider this:
 327         #   * --- B --- * --- O ($oldrev)
 328         #          \
 329         #           * --- X --- * --- N ($newrev)
 330         #
 331         # That is to say, there is no guarantee that oldrev is a strict
 332         # subset of newrev (it would have required a --force, but that's
 333         # allowed).  So, we can't simply say rev-list $oldrev..$newrev.
 334         # Instead we find the common base of the two revs and list from
 335         # there.
 336         #
 337         # As above, we need to take into account the presence of X; if
 338         # another branch is already in the repository and points at some of
 339         # the revisions that we are about to output - we don't want them.
 340         # The solution is as before: git rev-parse output filtered.
 341         #
 342         # Finally, tags: 1 --- 2 --- O --- T --- 3 --- 4 --- N
 343         #
 344         # Tags pushed into the repository generate nice shortlog emails that
 345         # summarise the commits between them and the previous tag.  However,
 346         # those emails don't include the full commit messages that we output
 347         # for a branch update.  Therefore we still want to output revisions
 348         # that have been output on a tag email.
 349         #
 350         # Luckily, git rev-parse includes just the tool.  Instead of using
 351         # "--all" we use "--branches"; this has the added benefit that
 352         # "remotes/" will be ignored as well.
 353
 354         # List all of the revisions that were removed by this update, in a
 355         # fast-forward update, this list will be empty, because rev-list O
 356         # ^N is empty.  For a non-fast-forward, O ^N is the list of removed
 357         # revisions
 358         fast_forward=""
 359         rev=""
 360         for rev in $(git rev-list $newrev..$oldrev)
 361         do
 362                 revtype=$(git cat-file -t "$rev")
 363                 echo "  discards  $rev ($revtype)"
 364         done
 365         if [ -z "$rev" ]; then
 366                 fast_forward=1
 367         fi
 368
 369         # List all the revisions from baserev to newrev in a kind of
 370         # "table-of-contents"; note this list can include revisions that
 371         # have already had notification emails and is present to show the
 372         # full detail of the change from rolling back the old revision to
 373         # the base revision and then forward to the new revision
 374         for rev in $(git rev-list $oldrev..$newrev)
 375         do
 376                 revtype=$(git cat-file -t "$rev")
 377                 echo "       via  $rev ($revtype)"
 378         done
 379
 380         if [ "$fast_forward" ]; then
 381                 echo "      from  $oldrev ($oldrev_type)"
 382         else
 383                 #  1. Existing revisions were removed.  In this case newrev
 384                 #     is a subset of oldrev - this is the reverse of a
 385                 #     fast-forward, a rewind
 386                 #  2. New revisions were added on top of an old revision,
 387                 #     this is a rewind and addition.
 388
 389                 # (1) certainly happened, (2) possibly.  When (2) hasn't
 390                 # happened, we set a flag to indicate that no log printout
 391                 # is required.
 392
 393                 echo ""
 394
 395                 # Find the common ancestor of the old and new revisions and
 396                 # compare it with newrev
 397                 baserev=$(git merge-base $oldrev $newrev)
 398                 rewind_only=""
 399                 if [ "$baserev" = "$newrev" ]; then
 400                         echo "This update discarded existing revisions and left the branch pointing at"
 401                         echo "a previous point in the repository history."
 402                         echo ""
 403                         echo " * -- * -- N ($newrev)"
 404                         echo "            \\"
 405                         echo "             O -- O -- O ($oldrev)"
 406                         echo ""
 407                         echo "The removed revisions are not necessarilly gone - if another reference"
 408                         echo "still refers to them they will stay in the repository."
 409                         rewind_only=1
 410                 else
 411                         echo "This update added new revisions after undoing existing revisions.  That is"
 412                         echo "to say, the old revision is not a strict subset of the new revision.  This"
 413                         echo "situation occurs when you --force push a change and generate a repository"
 414                         echo "containing something like this:"
 415                         echo ""
 416                         echo " * -- * -- B -- O -- O -- O ($oldrev)"
 417                         echo "            \\"
 418                         echo "             N -- N -- N ($newrev)"
 419                         echo ""
 420                         echo "When this happens we assume that you've already had alert emails for all"
 421                         echo "of the O revisions, and so we here report only the revisions in the N"
 422                         echo "branch from the common base, B."
 423                 fi
 424         fi
 425
 426         echo ""
 427         if [ -z "$rewind_only" ]; then
 428                 echo "Those revisions listed above that are new to this repository have"
 429                 echo "not appeared on any other notification email; so we list those"
 430                 echo "revisions in full, below."
 431
 432                 echo ""
 433                 echo $LOGBEGIN
 434                 show_new_revisions
 435
 436                 # XXX: Need a way of detecting whether git rev-list actually
 437                 # outputted anything, so that we can issue a "no new
 438                 # revisions added by this update" message
 439
 440                 echo $LOGEND
 441         else
 442                 echo "No new revisions were added by this update."
 443         fi
 444
 445         # The diffstat is shown from the old revision to the new revision.
 446         # This is to show the truth of what happened in this change.
 447         # There's no point showing the stat from the base to the new
 448         # revision because the base is effectively a random revision at this
 449         # point - the user will be interested in what this revision changed
 450         # - including the undoing of previous revisions in the case of
 451         # non-fast-forward updates.
 452         echo ""
 453         echo "Summary of changes:"
 454         git diff-tree $diffopts $oldrev..$newrev
 455 }
 456
 457 #
 458 # Called for the deletion of a branch
 459 #
 460 generate_delete_branch_email()
 461 {
 462         echo "       was  $oldrev"
 463         echo ""
 464         echo $LOGEND
 465         git show -s --pretty=oneline $oldrev
 466         echo $LOGEND
 467 }
 468
 469 # --------------- Annotated tags
 470
 471 #
 472 # Called for the creation of an annotated tag
 473 #
 474 generate_create_atag_email()
 475 {
 476         echo "        at  $newrev ($newrev_type)"
 477
 478         generate_atag_email
 479 }
 480
 481 #
 482 # Called for the update of an annotated tag (this is probably a rare event
 483 # and may not even be allowed)
 484 #
 485 generate_update_atag_email()
 486 {
 487         echo "        to  $newrev ($newrev_type)"
 488         echo "      from  $oldrev (which is now obsolete)"
 489
 490         generate_atag_email
 491 }
 492
 493 #
 494 # Called when an annotated tag is created or changed
 495 #
 496 generate_atag_email()
 497 {
 498         # Use git for-each-ref to pull out the individual fields from the
 499         # tag
 500         eval $(git for-each-ref --shell --format='
 501         tagobject=%(*objectname)
 502         tagtype=%(*objecttype)
 503         tagger=%(taggername)
 504         tagged=%(taggerdate)' $refname
 505         )
 506
 507         echo "   tagging  $tagobject ($tagtype)"
 508         case "$tagtype" in
 509         commit)
 510
 511                 # If the tagged object is a commit, then we assume this is a
 512                 # release, and so we calculate which tag this tag is
 513                 # replacing
 514                 prevtag=$(git describe --abbrev=0 $newrev^ 2>/dev/null)
 515
 516                 if [ -n "$prevtag" ]; then
 517                         echo "  replaces  $prevtag"
 518                 fi
 519                 ;;
 520         *)
 521                 echo "    length  $(git cat-file -s $tagobject) bytes"
 522                 ;;
 523         esac
 524         echo " tagged by  $tagger"
 525         echo "        on  $tagged"
 526
 527         echo ""
 528         echo $LOGBEGIN
 529
 530         # Show the content of the tag message; this might contain a change
 531         # log or release notes so is worth displaying.
 532         git cat-file tag $newrev | sed -e '1,/^$/d'
 533
 534         echo ""
 535         case "$tagtype" in
 536         commit)
 537                 # Only commit tags make sense to have rev-list operations
 538                 # performed on them
 539                 if [ -n "$prevtag" ]; then
 540                         # Show changes since the previous release
 541                         git rev-list --pretty=short "$prevtag..$newrev" | git shortlog
 542                 else
 543                         # No previous tag, show all the changes since time
 544                         # began
 545                         git rev-list --pretty=short $newrev | git shortlog
 546                 fi
 547                 ;;
 548         *)
 549                 # XXX: Is there anything useful we can do for non-commit
 550                 # objects?
 551                 ;;
 552         esac
 553
 554         echo $LOGEND
 555 }
 556
 557 #
 558 # Called for the deletion of an annotated tag
 559 #
 560 generate_delete_atag_email()
 561 {
 562         echo "       was  $oldrev"
 563         echo ""
 564         echo $LOGEND
 565         git show -s --pretty=oneline $oldrev
 566         echo $LOGEND
 567 }
 568
 569 # --------------- General references
 570
 571 #
 572 # Called when any other type of reference is created (most likely a
 573 # non-annotated tag)
 574 #
 575 generate_create_general_email()
 576 {
 577         echo "        at  $newrev ($newrev_type)"
 578
 579         generate_general_email
 580 }
 581
 582 #
 583 # Called when any other type of reference is updated (most likely a
 584 # non-annotated tag)
 585 #
 586 generate_update_general_email()
 587 {
 588         echo "        to  $newrev ($newrev_type)"
 589         echo "      from  $oldrev"
 590
 591         generate_general_email
 592 }
 593
 594 #
 595 # Called for creation or update of any other type of reference
 596 #
 597 generate_general_email()
 598 {
 599         # Unannotated tags are more about marking a point than releasing a
 600         # version; therefore we don't do the shortlog summary that we do for
 601         # annotated tags above - we simply show that the point has been
 602         # marked, and print the log message for the marked point for
 603         # reference purposes
 604         #
 605         # Note this section also catches any other reference type (although
 606         # there aren't any) and deals with them in the same way.
 607
 608         echo ""
 609         if [ "$newrev_type" = "commit" ]; then
 610                 echo $LOGBEGIN
 611                 git show --no-color --root -s --pretty=medium $newrev
 612                 echo $LOGEND
 613         else
 614                 # What can we do here?  The tag marks an object that is not
 615                 # a commit, so there is no log for us to display.  It's
 616                 # probably not wise to output git cat-file as it could be a
 617                 # binary blob.  We'll just say how big it is
 618                 echo "$newrev is a $newrev_type, and is $(git cat-file -s $newrev) bytes long."
 619         fi
 620 }
 621
 622 #
 623 # Called for the deletion of any other type of reference
 624 #
 625 generate_delete_general_email()
 626 {
 627         echo "       was  $oldrev"
 628         echo ""
 629         echo $LOGEND
 630         git show -s --pretty=oneline $oldrev
 631         echo $LOGEND
 632 }
 633
 634
 635 # --------------- Miscellaneous utilities
 636
 637 #
 638 # Show new revisions as the user would like to see them in the email.
 639 #
 640 show_new_revisions()
 641 {
 642         # This shows all log entries that are not already covered by
 643         # another ref - i.e. commits that are now accessible from this
 644         # ref that were previously not accessible
 645         # (see generate_update_branch_email for the explanation of this
 646         # command)
 647
 648         # Revision range passed to rev-list differs for new vs. updated
 649         # branches.
 650         if [ "$change_type" = create ]
 651         then
 652                 # Show all revisions exclusive to this (new) branch.
 653                 revspec=$newrev
 654         else
 655                 # Branch update; show revisions not part of $oldrev.
 656                 revspec=$oldrev..$newrev
 657         fi
 658
 659         other_branches=$(git for-each-ref --format='%(refname)' refs/heads/ |
 660             grep -F -v $refname)
 661         git rev-parse --not $other_branches |
 662         if [ -z "$custom_showrev" ]
 663         then
 664                 git rev-list --pretty --stdin $revspec
 665         else
 666                 git rev-list --stdin $revspec |
 667                 while read onerev
 668                 do
 669                         eval $(printf "$custom_showrev" $onerev)
 670                 done
 671         fi
 672 }
 673
 674
 675 limit_lines()
 676 {
 677         lines=0
 678         skipped=0
 679         while IFS="" read -r line; do
 680                 lines=$((lines + 1))
 681                 if [ $lines -gt $1 ]; then
 682                         skipped=$((skipped + 1))
 683                 else
 684                         printf "%s\n" "$line"
 685                 fi
 686         done
 687         if [ $skipped -ne 0 ]; then
 688                 echo "... $skipped lines suppressed ..."
 689         fi
 690 }
 691
 692
 693 send_mail()
 694 {
 695         if [ -n "$envelopesender" ]; then
 696                 /usr/sbin/sendmail -t -f "$envelopesender"
 697         else
 698                 /usr/sbin/sendmail -t
 699         fi
 700 }
 701
 702 # ---------------------------- main()
 703
 704 # --- Constants
 705 LOGBEGIN="- Log -----------------------------------------------------------------"
 706 LOGEND="-----------------------------------------------------------------------"
 707
 708 # --- Config
 709 # Set GIT_DIR either from the working directory, or from the environment
 710 # variable.
 711 GIT_DIR=$(git rev-parse --git-dir 2>/dev/null)
 712 if [ -z "$GIT_DIR" ]; then
 713         echo >&2 "fatal: post-receive: GIT_DIR not set"
 714         exit 1
 715 fi
 716
 717 projectdesc=$(sed -ne '1p' "$GIT_DIR/description" 2>/dev/null)
 718 # Check if the description is unchanged from it's default, and shorten it to
 719 # a more manageable length if it is
 720 if expr "$projectdesc" : "Unnamed repository.*$" >/dev/null
 721 then
 722         projectdesc="UNNAMED PROJECT"
 723 fi
 724
 725 recipients=$(git config hooks.mailinglist)
 726 announcerecipients=$(git config hooks.announcelist)
 727 envelopesender=$(git config hooks.envelopesender)
 728 emailprefix=$(git config hooks.emailprefix || echo '[SCM] ')
 729 custom_showrev=$(git config hooks.showrev)
 730 maxlines=$(git config hooks.emailmaxlines)
 731 diffopts=$(git config hooks.diffopts)
 732 : ${diffopts:="--stat --summary --find-copies-harder"}
 733
 734 # --- Main loop
 735 # Allow dual mode: run from the command line just like the update hook, or
 736 # if no arguments are given then run as a hook script
 737 if [ -n "$1" -a -n "$2" -a -n "$3" ]; then
 738         # Output to the terminal in command line mode - if someone wanted to
 739         # resend an email; they could redirect the output to sendmail
 740         # themselves
 741         prep_for_email $2 $3 $1 && PAGER= generate_email
 742 else
 743         while read oldrev newrev refname
 744         do
 745                 prep_for_email $oldrev $newrev $refname || continue
 746                 generate_email $maxlines | send_mail
 747         done
 748 fi