util/gitconfig/commit-msg

   1 #!/bin/sh
   2 # Part of Gerrit Code Review (http://code.google.com/p/gerrit/)
   3 #
   4 # Licensed under the Apache License, Version 2.0 (the "License");
   5 # you may not use this file except in compliance with the License.
   6 # You may obtain a copy of the License at
   7 #
   8 # http://www.apache.org/licenses/LICENSE-2.0
   9 #
  10 # Unless required by applicable law or agreed to in writing, software
  11 # distributed under the License is distributed on an "AS IS" BASIS,
  12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 # See the License for the specific language governing permissions and
  14 # limitations under the License.
  15 #
  16
  17 CHANGE_ID_AFTER="Bug|Issue"
  18 MSG="$1"
  19
  20 # Check for, and add if missing, a unique Change-Id
  21 #
  22 add_ChangeId() {
  23         clean_message=`sed -e '
  24                 /^diff --git a\/.*/{
  25                         s///
  26                         q
  27                 }
  28                 /^Signed-off-by:/d
  29                 /^#/d
  30         ' "$MSG" | git stripspace`
  31         if test -z "$clean_message"
  32         then
  33                 return
  34         fi
  35
  36         # Does Change-Id: already exist? if so, exit (no change).
  37         if grep -i '^Change-Id: I[0-9a-f]\{40\}$' "$MSG" >/dev/null
  38         then
  39                 return
  40         fi
  41
  42         id=`_gen_ChangeId`
  43         T="$MSG.tmp.$$"
  44         AWK=awk
  45         if [ -x /usr/xpg4/bin/awk ]; then
  46                 # Solaris AWK is just too broken
  47                 AWK=/usr/xpg4/bin/awk
  48         fi
  49
  50         # How this works:
  51         # - parse the commit message as (textLine+ blankLine*)*
  52         # - assume textLine+ to be a footer until proven otherwise
  53         # - exception: the first block is not footer (as it is the title)
  54         # - read textLine+ into a variable
  55         # - then count blankLines
  56         # - once the next textLine appears, print textLine+ blankLine* as these
  57         #   aren't footer
  58         # - in END, the last textLine+ block is available for footer parsing
  59         $AWK '
  60         BEGIN {
  61                 # while we start with the assumption that textLine+
  62                 # is a footer, the first block is not.
  63                 isFooter = 0
  64                 footerComment = 0
  65                 blankLines = 0
  66         }
  67
  68         # Skip lines starting with "#" without any spaces before it.
  69         /^#/ { next }
  70
  71         # Skip the line starting with the diff command and everything after it,
  72         # up to the end of the file, assuming it is only patch data.
  73         # If more than one line before the diff was empty, strip all but one.
  74         /^diff --git a/ {
  75                 blankLines = 0
  76                 while (getline) { }
  77                 next
  78         }
  79
  80         # Count blank lines outside footer comments
  81         /^$/ && (footerComment == 0) {
  82                 blankLines++
  83                 next
  84         }
  85
  86         # Catch footer comment
  87         /^\[[a-zA-Z0-9-]+:/ && (isFooter == 1) {
  88                 footerComment = 1
  89         }
  90
  91         /]$/ && (footerComment == 1) {
  92                 footerComment = 2
  93         }
  94
  95         # We have a non-blank line after blank lines. Handle this.
  96         (blankLines > 0) {
  97                 print lines
  98                 for (i = 0; i < blankLines; i++) {
  99                         print ""
 100                 }
 101
 102                 lines = ""
 103                 blankLines = 0
 104                 isFooter = 1
 105                 footerComment = 0
 106         }
 107
 108         # Detect that the current block is not the footer
 109         (footerComment == 0) && (!/^\[?[a-zA-Z0-9-]+:/ || /^[a-zA-Z0-9-]+:\/\//) {
 110                 isFooter = 0
 111         }
 112
 113         {
 114                 # We need this information about the current last comment line
 115                 if (footerComment == 2) {
 116                         footerComment = 0
 117                 }
 118                 if (lines != "") {
 119                         lines = lines "\n";
 120                 }
 121                 lines = lines $0
 122         }
 123
 124         # Footer handling:
 125         # If the last block is considered a footer, splice in the Change-Id at the
 126         # right place.
 127         # Look for the right place to inject Change-Id by considering
 128         # CHANGE_ID_AFTER. Keys listed in it (case insensitive) come first,
 129         # then Change-Id, then everything else (eg. Signed-off-by:).
 130         #
 131         # Otherwise just print the last block, a new line and the Change-Id as a
 132         # block of its own.
 133         END {
 134                 unprinted = 1
 135                 if (isFooter == 0) {
 136                         print lines "\n"
 137                         lines = ""
 138                 }
 139                 changeIdAfter = "^(" tolower("'"$CHANGE_ID_AFTER"'") "):"
 140                 numlines = split(lines, footer, "\n")
 141                 for (line = 1; line <= numlines; line++) {
 142                         if (unprinted && match(tolower(footer[line]), changeIdAfter) != 1) {
 143                                 unprinted = 0
 144                                 print "Change-Id: I'"$id"'"
 145                         }
 146                         print footer[line]
 147                 }
 148                 if (unprinted) {
 149                         print "Change-Id: I'"$id"'"
 150                 }
 151         }' "$MSG" > $T && mv $T "$MSG" || rm -f $T
 152 }
 153 _gen_ChangeIdInput() {
 154         echo "tree `git write-tree`"
 155         if parent=`git rev-parse "HEAD^0" 2>/dev/null`
 156         then
 157                 echo "parent $parent"
 158         fi
 159         echo "author `git var GIT_AUTHOR_IDENT`"
 160         echo "committer `git var GIT_COMMITTER_IDENT`"
 161         echo
 162         printf '%s' "$clean_message"
 163 }
 164 _gen_ChangeId() {
 165         _gen_ChangeIdInput |
 166         git hash-object -t commit --stdin
 167 }
 168
 169 if ! grep -qi '^[[:space:]]*Signed-off-by:' "$MSG"; then
 170         printf "\nError: No Signed-off-by line in the commit message.\n"
 171         exit 1
 172 fi
 173 add_ChangeId