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