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.
   6 #
   7 # NOTE: This script is no longer under active development.  There
   8 # is another script, git-multimail, which is more capable and
   9 # configurable and is largely backwards-compatible with this script;
  10 # please see "contrib/hooks/multimail/".  For instructions on how to
  11 # migrate from post-receive-email to git-multimail, please see
  12 # "README.migrate-from-post-receive-email" in that directory.
  13 #
  14 # This hook sends emails listing new revisions to the repository
  15 # introduced by the change being reported.  The rule is that (for
  16 # branch updates) each commit will appear on one email and one email
  17 # only.
  18 #
  19 # This hook is stored in the contrib/hooks directory.  Your distribution
  20 # will have put this somewhere standard.  You should make this script
  21 # executable then link to it in the repository you would like to use it in.
  22 # For example, on debian the hook is stored in
  23 # /usr/share/git-core/contrib/hooks/post-receive-email:
  24 #
  25 #  cd /path/to/your/repository.git
  26 #  ln -sf /usr/share/git-core/contrib/hooks/post-receive-email hooks/post-receive
  27 #
  28 # This hook script assumes it is enabled on the central repository of a
  29 # project, with all users pushing only to it and not between each other.  It
  30 # will still work if you don't operate in that style, but it would become
  31 # possible for the email to be from someone other than the person doing the
  32 # push.
  33 #
  34 # To help with debugging and use on pre-v1.5.1 git servers, this script will
  35 # also obey the interface of hooks/update, taking its arguments on the
  36 # command line.  Unfortunately, hooks/update is called once for each ref.
  37 # To avoid firing one email per ref, this script just prints its output to
  38 # the screen when used in this mode.  The output can then be redirected if
  39 # wanted.
  40 #
  41 # Config
  42 # ------
  43 # hooks.mailinglist
  44 #   This is the list that all pushes will go to; leave it blank to not send
  45 #   emails for every ref update.
  46 # hooks.announcelist
  47 #   This is the list that all pushes of annotated tags will go to.  Leave it
  48 #   blank to default to the mailinglist field.  The announce emails lists
  49 #   the short log summary of the changes since the last annotated tag.
  50 # hooks.envelopesender
  51 #   If set then the -f option is passed to sendmail to allow the envelope
  52 #   sender address to be set
  53 # hooks.emailprefix
  54 #   All emails have their subjects prefixed with this prefix, or "[SCM]"
  55 #   if emailprefix is unset, to aid filtering
  56 # hooks.showrev
  57 #   The shell command used to format each revision in the email, with
  58 #   "%s" replaced with the commit id.  Defaults to "git rev-list -1
  59 #   --pretty %s", displaying the commit id, author, date and log
  60 #   message.  To list full patches separated by a blank line, you
  61 #   could set this to "git show -C %s; echo".
  62 #   To list a gitweb/cgit URL *and* a full patch for each change set, use this:
  63 #     "t=%s; printf 'http://.../?id=%%s' \$t; echo;echo; git show -C \$t; echo"
  64 #   Be careful if "..." contains things that will be expanded by shell "eval"
  65 #   or printf.
  66 # hooks.emailmaxlines
  67 #   The maximum number of lines that should be included in the generated
  68 #   email body. If not specified, there is no limit.
  69 #   Lines beyond the limit are suppressed and counted, and a final
  70 #   line is added indicating the number of suppressed lines.
  71 # hooks.diffopts
  72 #   Alternate options for the git diff-tree invocation that shows changes.
  73 #   Default is "--stat --summary --find-copies-harder". Add -p to those
  74 #   options to include a unified diff of changes in addition to the usual
  75 #   summary output.
  76 #
  77 # Notes
  78 # -----
  79 # All emails include the headers "X-Git-Refname", "X-Git-Oldrev",
  80 # "X-Git-Newrev", and "X-Git-Reftype" to enable fine tuned filtering and
  81 # give information for debugging.
  82 #
  83
  84 # ---------------------------- Functions
  85
  86 #
  87 # Function to prepare for email generation. This decides what type
  88 # of update this is and whether an email should even be generated.
  89 #
  90 prep_for_email()
  91 {
  92         # --- Arguments
  93         oldrev=$(git rev-parse $1)
  94         newrev=$(git rev-parse $2)
  95         refname="$3"
  96
  97         # --- Interpret
  98         # 0000->1234 (create)
  99         # 1234->2345 (update)
 100         # 2345->0000 (delete)
 101         if expr "$oldrev" : '0*$' >/dev/null
 102         then
 103                 change_type="create"
 104         else
 105                 if expr "$newrev" : '0*$' >/dev/null
 106                 then
 107                         change_type="delete"
 108                 else
 109                         change_type="update"
 110                 fi
 111         fi
 112
 113         # --- Get the revision types
 114         newrev_type=$(git cat-file -t $newrev 2> /dev/null)
 115         oldrev_type=$(git cat-file -t "$oldrev" 2> /dev/null)
 116         case "$change_type" in
 117         create|update)
 118                 rev="$newrev"
 119                 rev_type="$newrev_type"
 120                 ;;
 121         delete)
 122                 rev="$oldrev"
 123                 rev_type="$oldrev_type"
 124                 ;;
 125         esac
 126
 127         # The revision type tells us what type the commit is, combined with
 128         # the location of the ref we can decide between
 129         #  - working branch
 130         #  - tracking branch
 131         #  - unannoted tag
 132         #  - annotated tag
 133         case "$refname","$rev_type" in
 134                 refs/tags/*,commit)
 135                         # un-annotated tag
 136                         refname_type="tag"
 137                         short_refname=${refname##refs/tags/}
 138                         ;;
 139                 refs/tags/*,tag)
 140                         # annotated tag
 141                         refname_type="annotated tag"
 142                         short_refname=${refname##refs/tags/}
 143                         # change recipients
 144                         if [ -n "$announcerecipients" ]; then
 145                                 recipients="$announcerecipients"
 146                         fi
 147                         ;;
 148                 refs/heads/*,commit)
 149                         # branch
 150                         refname_type="branch"
 151                         short_refname=${refname##refs/heads/}
 152                         ;;
 153                 refs/remotes/*,commit)
 154                         # tracking branch
 155                         refname_type="tracking branch"
 156                         short_refname=${refname##refs/remotes/}
 157                         echo >&2 "*** Push-update of tracking branch, $refname"
 158                         echo >&2 "***  - no email generated."
 159                         return 1
 160                         ;;
 161                 *)
 162                         # Anything else (is there anything else?)
 163                         echo >&2 "*** Unknown type of update to $refname ($rev_type)"
 164                         echo >&2 "***  - no email generated"
 165                         return 1
 166                         ;;
 167         esac
 168
 169         # Check if we've got anyone to send to
 170         if [ -z "$recipients" ]; then
 171                 case "$refname_type" in
 172                         "annotated tag")
 173                                 config_name="hooks.announcelist"
 174                                 ;;
 175                         *)
 176                                 config_name="hooks.mailinglist"
 177                                 ;;
 178                 esac
 179                 echo >&2 "*** $config_name is not set so no email will be sent"
 180                 echo >&2 "*** for $refname update $oldrev->$newrev"
 181                 return 1
 182         fi
 183
 184         return 0
 185 }
 186
 187 #
 188 # Top level email generation function.  This calls the appropriate
 189 # body-generation routine after outputting the common header.
 190 #
 191 # Note this function doesn't actually generate any email output, that is
 192 # taken care of by the functions it calls:
 193 #  - generate_email_header
 194 #  - generate_create_XXXX_email
 195 #  - generate_update_XXXX_email
 196 #  - generate_delete_XXXX_email
 197 #  - generate_email_footer
 198 #
 199 # Note also that this function cannot 'exit' from the script; when this
 200 # function is running (in hook script mode), the send_mail() function
 201 # is already executing in another process, connected via a pipe, and
 202 # if this function exits without, whatever has been generated to that
 203 # point will be sent as an email... even if nothing has been generated.
 204 #
 205 generate_email()
 206 {
 207         # Email parameters
 208         # The email subject will contain the best description of the ref
 209         # that we can build from the parameters
 210         describe=$(git describe $rev 2>/dev/null)
 211         if [ -z "$describe" ]; then
 212                 describe=$rev
 213         fi
 214
 215         generate_email_header
 216
 217         # Call the correct body generation function
 218         fn_name=general
 219         case "$refname_type" in
 220         "tracking branch"|branch)
 221                 fn_name=branch
 222                 ;;
 223         "annotated tag")
 224                 fn_name=atag
 225                 ;;
 226         esac
 227
 228         if [ -z "$maxlines" ]; then
 229                 generate_${change_type}_${fn_name}_email
 230         else
 231                 generate_${change_type}_${fn_name}_email | limit_lines $maxlines
 232         fi
 233
 234         generate_email_footer
 235 }
 236
 237 generate_email_header()
 238 {
 239         # --- Email (all stdout will be the email)
 240         # Generate header
 241         cat <<-EOF
 242         To: $recipients
 243         Subject: ${emailprefix}$projectdesc $refname_type $short_refname ${change_type}d. $describe
 244         MIME-Version: 1.0
 245         Content-Type: text/plain; charset=utf-8
 246         Content-Transfer-Encoding: 8bit
 247         X-Git-Refname: $refname
 248         X-Git-Reftype: $refname_type
 249         X-Git-Oldrev: $oldrev
 250         X-Git-Newrev: $newrev
 251         Auto-Submitted: auto-generated
 252
 253         This is an automated email from the git hooks/post-receive script. It was
 254         generated because a ref change was pushed to the repository containing
 255         the project "$projectdesc".
 256
 257         The $refname_type, $short_refname has been ${change_type}d
 258         EOF
 259 }
 260
 261 generate_email_footer()
 262 {
 263         SPACE=" "
 264         cat <<-EOF
 265
 266
 267         hooks/post-receive
 268         --${SPACE}
 269         $projectdesc
 270         EOF
 271 }
 272
 273 # --------------- Branches
 274
 275 #
 276 # Called for the creation of a branch
 277 #
 278 generate_create_branch_email()
 279 {
 280         # This is a new branch and so oldrev is not valid
 281         echo "        at  $newrev ($newrev_type)"
 282         echo ""
 283
 284         echo $LOGBEGIN
 285         show_new_revisions
 286         echo $LOGEND
 287 }
 288
 289 #
 290 # Called for the change of a pre-existing branch
 291 #
 292 generate_update_branch_email()
 293 {
 294         # Consider this:
 295         #   1 --- 2 --- O --- X --- 3 --- 4 --- N
 296         #
 297         # O is $oldrev for $refname
 298         # N is $newrev for $refname
 299         # X is a revision pointed to by some other ref, for which we may
 300         #   assume that an email has already been generated.
 301         # In this case we want to issue an email containing only revisions
 302         # 3, 4, and N.  Given (almost) by
 303         #
 304         #  git rev-list N ^O --not --all
 305         #
 306         # The reason for the "almost", is that the "--not --all" will take
 307         # precedence over the "N", and effectively will translate to
 308         #
 309         #  git rev-list N ^O ^X ^N
 310         #
 311         # So, we need to build up the list more carefully.  git rev-parse
 312         # will generate a list of revs that may be fed into git rev-list.
 313         # We can get it to make the "--not --all" part and then filter out
 314         # the "^N" with:
 315         #
 316         #  git rev-parse --not --all | grep -v N
 317         #
 318         # Then, using the --stdin switch to git rev-list we have effectively
 319         # manufactured
 320         #
 321         #  git rev-list N ^O ^X
 322         #
 323         # This leaves a problem when someone else updates the repository
 324         # while this script is running.  Their new value of the ref we're
 325         # working on would be included in the "--not --all" output; and as
 326         # our $newrev would be an ancestor of that commit, it would exclude
 327         # all of our commits.  What we really want is to exclude the current
 328         # value of $refname from the --not list, rather than N itself.  So:
 329         #
 330         #  git rev-parse --not --all | grep -v $(git rev-parse $refname)
 331         #
 332         # Get's us to something pretty safe (apart from the small time
 333         # between refname being read, and git rev-parse running - for that,
 334         # I give up)
 335         #
 336         #
 337         # Next problem, consider this:
 338         #   * --- B --- * --- O ($oldrev)
 339         #          \
 340         #           * --- X --- * --- N ($newrev)
 341         #
 342         # That is to say, there is no guarantee that oldrev is a strict
 343         # subset of newrev (it would have required a --force, but that's
 344         # allowed).  So, we can't simply say rev-list $oldrev..$newrev.
 345         # Instead we find the common base of the two revs and list from
 346         # there.
 347         #
 348         # As above, we need to take into account the presence of X; if
 349         # another branch is already in the repository and points at some of
 350         # the revisions that we are about to output - we don't want them.
 351         # The solution is as before: git rev-parse output filtered.
 352         #
 353         # Finally, tags: 1 --- 2 --- O --- T --- 3 --- 4 --- N
 354         #
 355         # Tags pushed into the repository generate nice shortlog emails that
 356         # summarise the commits between them and the previous tag.  However,
 357         # those emails don't include the full commit messages that we output
 358         # for a branch update.  Therefore we still want to output revisions
 359         # that have been output on a tag email.
 360         #
 361         # Luckily, git rev-parse includes just the tool.  Instead of using
 362         # "--all" we use "--branches"; this has the added benefit that
 363         # "remotes/" will be ignored as well.
 364
 365         # List all of the revisions that were removed by this update, in a
 366         # fast-forward update, this list will be empty, because rev-list O
 367         # ^N is empty.  For a non-fast-forward, O ^N is the list of removed
 368         # revisions
 369         fast_forward=""
 370         rev=""
 371         for rev in $(git rev-list $newrev..$oldrev)
 372         do
 373                 revtype=$(git cat-file -t "$rev")
 374                 echo "  discards  $rev ($revtype)"
 375         done
 376         if [ -z "$rev" ]; then
 377                 fast_forward=1
 378         fi
 379
 380         # List all the revisions from baserev to newrev in a kind of
 381         # "table-of-contents"; note this list can include revisions that
 382         # have already had notification emails and is present to show the
 383         # full detail of the change from rolling back the old revision to
 384         # the base revision and then forward to the new revision
 385         for rev in $(git rev-list $oldrev..$newrev)
 386         do
 387                 revtype=$(git cat-file -t "$rev")
 388                 echo "       via  $rev ($revtype)"
 389         done
 390
 391         if [ "$fast_forward" ]; then
 392                 echo "      from  $oldrev ($oldrev_type)"
 393         else
 394                 #  1. Existing revisions were removed.  In this case newrev
 395                 #     is a subset of oldrev - this is the reverse of a
 396                 #     fast-forward, a rewind
 397                 #  2. New revisions were added on top of an old revision,
 398                 #     this is a rewind and addition.
 399
 400                 # (1) certainly happened, (2) possibly.  When (2) hasn't
 401                 # happened, we set a flag to indicate that no log printout
 402                 # is required.
 403
 404                 echo ""
 405
 406                 # Find the common ancestor of the old and new revisions and
 407                 # compare it with newrev
 408                 baserev=$(git merge-base $oldrev $newrev)
 409                 rewind_only=""
 410                 if [ "$baserev" = "$newrev" ]; then
 411                         echo "This update discarded existing revisions and left the branch pointing at"
 412                         echo "a previous point in the repository history."
 413                         echo ""
 414                         echo " * -- * -- N ($newrev)"
 415                         echo "            \\"
 416                         echo "             O -- O -- O ($oldrev)"
 417                         echo ""
 418                         echo "The removed revisions are not necessarily gone - if another reference"
 419                         echo "still refers to them they will stay in the repository."
 420                         rewind_only=1
 421                 else
 422                         echo "This update added new revisions after undoing existing revisions.  That is"
 423                         echo "to say, the old revision is not a strict subset of the new revision.  This"
 424                         echo "situation occurs when you --force push a change and generate a repository"
 425                         echo "containing something like this:"
 426                         echo ""
 427                         echo " * -- * -- B -- O -- O -- O ($oldrev)"
 428                         echo "            \\"
 429                         echo "             N -- N -- N ($newrev)"
 430                         echo ""
 431                         echo "When this happens we assume that you've already had alert emails for all"
 432                         echo "of the O revisions, and so we here report only the revisions in the N"
 433                         echo "branch from the common base, B."
 434                 fi
 435         fi
 436
 437         echo ""
 438         if [ -z "$rewind_only" ]; then
 439                 echo "Those revisions listed above that are new to this repository have"
 440                 echo "not appeared on any other notification email; so we list those"
 441                 echo "revisions in full, below."
 442
 443                 echo ""
 444                 echo $LOGBEGIN
 445                 show_new_revisions
 446
 447                 # XXX: Need a way of detecting whether git rev-list actually
 448                 # outputted anything, so that we can issue a "no new
 449                 # revisions added by this update" message
 450
 451                 echo $LOGEND
 452         else
 453                 echo "No new revisions were added by this update."
 454         fi
 455
 456         # The diffstat is shown from the old revision to the new revision.
 457         # This is to show the truth of what happened in this change.
 458         # There's no point showing the stat from the base to the new
 459         # revision because the base is effectively a random revision at this
 460         # point - the user will be interested in what this revision changed
 461         # - including the undoing of previous revisions in the case of
 462         # non-fast-forward updates.
 463         echo ""
 464         echo "Summary of changes:"
 465         git diff-tree $diffopts $oldrev..$newrev
 466 }
 467
 468 #
 469 # Called for the deletion of a branch
 470 #
 471 generate_delete_branch_email()
 472 {
 473         echo "       was  $oldrev"
 474         echo ""
 475         echo $LOGBEGIN
 476         git diff-tree -s --always --encoding=UTF-8 --pretty=oneline $oldrev
 477         echo $LOGEND
 478 }
 479
 480 # --------------- Annotated tags
 481
 482 #
 483 # Called for the creation of an annotated tag
 484 #
 485 generate_create_atag_email()
 486 {
 487         echo "        at  $newrev ($newrev_type)"
 488
 489         generate_atag_email
 490 }
 491
 492 #
 493 # Called for the update of an annotated tag (this is probably a rare event
 494 # and may not even be allowed)
 495 #
 496 generate_update_atag_email()
 497 {
 498         echo "        to  $newrev ($newrev_type)"
 499         echo "      from  $oldrev (which is now obsolete)"
 500
 501         generate_atag_email
 502 }
 503
 504 #
 505 # Called when an annotated tag is created or changed
 506 #
 507 generate_atag_email()
 508 {
 509         # Use git for-each-ref to pull out the individual fields from the
 510         # tag
 511         eval $(git for-each-ref --shell --format='
 512         tagobject=%(*objectname)
 513         tagtype=%(*objecttype)
 514         tagger=%(taggername)
 515         tagged=%(taggerdate)' $refname
 516         )
 517
 518         echo "   tagging  $tagobject ($tagtype)"
 519         case "$tagtype" in
 520         commit)
 521
 522                 # If the tagged object is a commit, then we assume this is a
 523                 # release, and so we calculate which tag this tag is
 524                 # replacing
 525                 prevtag=$(git describe --abbrev=0 $newrev^ 2>/dev/null)
 526
 527                 if [ -n "$prevtag" ]; then
 528                         echo "  replaces  $prevtag"
 529                 fi
 530                 ;;
 531         *)
 532                 echo "    length  $(git cat-file -s $tagobject) bytes"
 533                 ;;
 534         esac
 535         echo " tagged by  $tagger"
 536         echo "        on  $tagged"
 537
 538         echo ""
 539         echo $LOGBEGIN
 540
 541         # Show the content of the tag message; this might contain a change
 542         # log or release notes so is worth displaying.
 543         git cat-file tag $newrev | sed -e '1,/^$/d'
 544
 545         echo ""
 546         case "$tagtype" in
 547         commit)
 548                 # Only commit tags make sense to have rev-list operations
 549                 # performed on them
 550                 if [ -n "$prevtag" ]; then
 551                         # Show changes since the previous release
 552                         git shortlog "$prevtag..$newrev"
 553                 else
 554                         # No previous tag, show all the changes since time
 555                         # began
 556                         git shortlog $newrev
 557                 fi
 558                 ;;
 559         *)
 560                 # XXX: Is there anything useful we can do for non-commit
 561                 # objects?
 562                 ;;
 563         esac
 564
 565         echo $LOGEND
 566 }
 567
 568 #
 569 # Called for the deletion of an annotated tag
 570 #
 571 generate_delete_atag_email()
 572 {
 573         echo "       was  $oldrev"
 574         echo ""
 575         echo $LOGBEGIN
 576         git diff-tree -s --always --encoding=UTF-8 --pretty=oneline $oldrev
 577         echo $LOGEND
 578 }
 579
 580 # --------------- General references
 581
 582 #
 583 # Called when any other type of reference is created (most likely a
 584 # non-annotated tag)
 585 #
 586 generate_create_general_email()
 587 {
 588         echo "        at  $newrev ($newrev_type)"
 589
 590         generate_general_email
 591 }
 592
 593 #
 594 # Called when any other type of reference is updated (most likely a
 595 # non-annotated tag)
 596 #
 597 generate_update_general_email()
 598 {
 599         echo "        to  $newrev ($newrev_type)"
 600         echo "      from  $oldrev"
 601
 602         generate_general_email
 603 }
 604
 605 #
 606 # Called for creation or update of any other type of reference
 607 #
 608 generate_general_email()
 609 {
 610         # Unannotated tags are more about marking a point than releasing a
 611         # version; therefore we don't do the shortlog summary that we do for
 612         # annotated tags above - we simply show that the point has been
 613         # marked, and print the log message for the marked point for
 614         # reference purposes
 615         #
 616         # Note this section also catches any other reference type (although
 617         # there aren't any) and deals with them in the same way.
 618
 619         echo ""
 620         if [ "$newrev_type" = "commit" ]; then
 621                 echo $LOGBEGIN
 622                 git diff-tree -s --always --encoding=UTF-8 --pretty=medium $newrev
 623                 echo $LOGEND
 624         else
 625                 # What can we do here?  The tag marks an object that is not
 626                 # a commit, so there is no log for us to display.  It's
 627                 # probably not wise to output git cat-file as it could be a
 628                 # binary blob.  We'll just say how big it is
 629                 echo "$newrev is a $newrev_type, and is $(git cat-file -s $newrev) bytes long."
 630         fi
 631 }
 632
 633 #
 634 # Called for the deletion of any other type of reference
 635 #
 636 generate_delete_general_email()
 637 {
 638         echo "       was  $oldrev"
 639         echo ""
 640         echo $LOGBEGIN
 641         git diff-tree -s --always --encoding=UTF-8 --pretty=oneline $oldrev
 642         echo $LOGEND
 643 }
 644
 645
 646 # --------------- Miscellaneous utilities
 647
 648 #
 649 # Show new revisions as the user would like to see them in the email.
 650 #
 651 show_new_revisions()
 652 {
 653         # This shows all log entries that are not already covered by
 654         # another ref - i.e. commits that are now accessible from this
 655         # ref that were previously not accessible
 656         # (see generate_update_branch_email for the explanation of this
 657         # command)
 658
 659         # Revision range passed to rev-list differs for new vs. updated
 660         # branches.
 661         if [ "$change_type" = create ]
 662         then
 663                 # Show all revisions exclusive to this (new) branch.
 664                 revspec=$newrev
 665         else
 666                 # Branch update; show revisions not part of $oldrev.
 667                 revspec=$oldrev..$newrev
 668         fi
 669
 670         other_branches=$(git for-each-ref --format='%(refname)' refs/heads/ |
 671             grep -F -v $refname)
 672         git rev-parse --not $other_branches |
 673         if [ -z "$custom_showrev" ]
 674         then
 675                 git rev-list --pretty --stdin $revspec
 676         else
 677                 git rev-list --stdin $revspec |
 678                 while read onerev
 679                 do
 680                         eval $(printf "$custom_showrev" $onerev)
 681                 done
 682         fi
 683 }
 684
 685
 686 limit_lines()
 687 {
 688         lines=0
 689         skipped=0
 690         while IFS="" read -r line; do
 691                 lines=$((lines + 1))
 692                 if [ $lines -gt $1 ]; then
 693                         skipped=$((skipped + 1))
 694                 else
 695                         printf "%s\n" "$line"
 696                 fi
 697         done
 698         if [ $skipped -ne 0 ]; then
 699                 echo "... $skipped lines suppressed ..."
 700         fi
 701 }
 702
 703
 704 send_mail()
 705 {
 706         if [ -n "$envelopesender" ]; then
 707                 /usr/sbin/sendmail -t -f "$envelopesender"
 708         else
 709                 /usr/sbin/sendmail -t
 710         fi
 711 }
 712
 713 # ---------------------------- main()
 714
 715 # --- Constants
 716 LOGBEGIN="- Log -----------------------------------------------------------------"
 717 LOGEND="-----------------------------------------------------------------------"
 718
 719 # --- Config
 720 # Set GIT_DIR either from the working directory, or from the environment
 721 # variable.
 722 GIT_DIR=$(git rev-parse --git-dir 2>/dev/null)
 723 if [ -z "$GIT_DIR" ]; then
 724         echo >&2 "fatal: post-receive: GIT_DIR not set"
 725         exit 1
 726 fi
 727
 728 projectdesc=$(sed -ne '1p' "$GIT_DIR/description" 2>/dev/null)
 729 # Check if the description is unchanged from it's default, and shorten it to
 730 # a more manageable length if it is
 731 if expr "$projectdesc" : "Unnamed repository.*$" >/dev/null
 732 then
 733         projectdesc="UNNAMED PROJECT"
 734 fi
 735
 736 recipients=$(git config hooks.mailinglist)
 737 announcerecipients=$(git config hooks.announcelist)
 738 envelopesender=$(git config hooks.envelopesender)
 739 emailprefix=$(git config hooks.emailprefix || echo '[SCM] ')
 740 custom_showrev=$(git config hooks.showrev)
 741 maxlines=$(git config hooks.emailmaxlines)
 742 diffopts=$(git config hooks.diffopts)
 743 : ${diffopts:="--stat --summary --find-copies-harder"}
 744
 745 # --- Main loop
 746 # Allow dual mode: run from the command line just like the update hook, or
 747 # if no arguments are given then run as a hook script
 748 if [ -n "$1" -a -n "$2" -a -n "$3" ]; then
 749         # Output to the terminal in command line mode - if someone wanted to
 750         # resend an email; they could redirect the output to sendmail
 751         # themselves
 752         prep_for_email $2 $3 $1 && PAGER= generate_email
 753 else
 754         while read oldrev newrev refname
 755         do
 756                 prep_for_email $oldrev $newrev $refname || continue
 757                 generate_email $maxlines | send_mail
 758         done
 759 fi