ext/git-commit-msg

   1 #!/bin/sh
   2 # From Gerrit Code Review 2.13.5-2617-gba50ae91fd
   3 #
   4 # Part of Gerrit Code Review (https://www.gerritcodereview.com/)
   5 #
   6 # Copyright (C) 2009 The Android Open Source Project
   7 #
   8 # Licensed under the Apache License, Version 2.0 (the "License");
   9 # you may not use this file except in compliance with the License.
  10 # You may obtain a copy of the License at
  11 #
  12 # http://www.apache.org/licenses/LICENSE-2.0
  13 #
  14 # Unless required by applicable law or agreed to in writing, software
  15 # distributed under the License is distributed on an "AS IS" BASIS,
  16 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17 # See the License for the specific language governing permissions and
  18 # limitations under the License.
  19 #
  20
  21 unset GREP_OPTIONS
  22
  23 CHANGE_ID_AFTER="Bug|Depends-On|Issue|Test|Feature|Fixes|Fixed"
  24 MSG="$1"
  25
  26 # Check for, and add if missing, a unique Change-Id
  27 #
  28 add_ChangeId() {
  29         clean_message=`sed -e '
  30                 /^diff --git .*/{
  31                         s///
  32                         q
  33                 }
  34                 /^Signed-off-by:/d
  35                 /^#/d
  36         ' "$MSG" | git stripspace`
  37         if test -z "$clean_message"
  38         then
  39                 return
  40         fi
  41
  42         # Do not add Change-Id to temp commits
  43         if echo "$clean_message" | head -1 | grep -q '^\(fixup\|squash\)!'
  44         then
  45                 return
  46         fi
  47
  48         if test "false" = "`git config --bool --get gerrit.createChangeId`"
  49         then
  50                 return
  51         fi
  52
  53         # Does Change-Id: already exist? if so, exit (no change).
  54         if grep -i '^Change-Id:' "$MSG" >/dev/null
  55         then
  56                 return
  57         fi
  58
  59         id=`_gen_ChangeId`
  60         T="$MSG.tmp.$$"
  61         AWK=awk
  62         if [ -x /usr/xpg4/bin/awk ]; then
  63                 # Solaris AWK is just too broken
  64                 AWK=/usr/xpg4/bin/awk
  65         fi
  66
  67         # Get core.commentChar from git config or use default symbol
  68         commentChar=`git config --get core.commentChar`
  69         commentChar=${commentChar:-#}
  70
  71         # How this works:
  72         # - parse the commit message as (textLine+ blankLine*)*
  73         # - assume textLine+ to be a footer until proven otherwise
  74         # - exception: the first block is not footer (as it is the title)
  75         # - read textLine+ into a variable
  76         # - then count blankLines
  77         # - once the next textLine appears, print textLine+ blankLine* as these
  78         #   aren't footer
  79         # - in END, the last textLine+ block is available for footer parsing
  80         $AWK '
  81         BEGIN {
  82                 # while we start with the assumption that textLine+
  83                 # is a footer, the first block is not.
  84                 isFooter = 0
  85                 footerComment = 0
  86                 blankLines = 0
  87         }
  88
  89         # Skip lines starting with commentChar without any spaces before it.
  90         /^'"$commentChar"'/ { next }
  91
  92         # Skip the line starting with the diff command and everything after it,
  93         # up to the end of the file, assuming it is only patch data.
  94         # If more than one line before the diff was empty, strip all but one.
  95         /^diff --git / {
  96                 blankLines = 0
  97                 while (getline) { }
  98                 next
  99         }
 100
 101         # Count blank lines outside footer comments
 102         /^$/ && (footerComment == 0) {
 103                 blankLines++
 104                 next
 105         }
 106
 107         # Catch footer comment
 108         /^\[[a-zA-Z0-9-]+:/ && (isFooter == 1) {
 109                 footerComment = 1
 110         }
 111
 112         /]$/ && (footerComment == 1) {
 113                 footerComment = 2
 114         }
 115
 116         # We have a non-blank line after blank lines. Handle this.
 117         (blankLines > 0) {
 118                 print lines
 119                 for (i = 0; i < blankLines; i++) {
 120                         print ""
 121                 }
 122
 123                 lines = ""
 124                 blankLines = 0
 125                 isFooter = 1
 126                 footerComment = 0
 127         }
 128
 129         # Detect that the current block is not the footer
 130         (footerComment == 0) && (!/^\[?[a-zA-Z0-9-]+:/ || /^[a-zA-Z0-9-]+:\/\//) {
 131                 isFooter = 0
 132         }
 133
 134         {
 135                 # We need this information about the current last comment line
 136                 if (footerComment == 2) {
 137                         footerComment = 0
 138                 }
 139                 if (lines != "") {
 140                         lines = lines "\n";
 141                 }
 142                 lines = lines $0
 143         }
 144
 145         # Footer handling:
 146         # If the last block is considered a footer, splice in the Change-Id at the
 147         # right place.
 148         # Look for the right place to inject Change-Id by considering
 149         # CHANGE_ID_AFTER. Keys listed in it (case insensitive) come first,
 150         # then Change-Id, then everything else (eg. Signed-off-by:).
 151         #
 152         # Otherwise just print the last block, a new line and the Change-Id as a
 153         # block of its own.
 154         END {
 155                 unprinted = 1
 156                 if (isFooter == 0) {
 157                         print lines "\n"
 158                         lines = ""
 159                 }
 160                 changeIdAfter = "^(" tolower("'"$CHANGE_ID_AFTER"'") "):"
 161                 numlines = split(lines, footer, "\n")
 162                 for (line = 1; line <= numlines; line++) {
 163                         if (unprinted && match(tolower(footer[line]), changeIdAfter) != 1) {
 164                                 unprinted = 0
 165                                 print "Change-Id: I'"$id"'"
 166                         }
 167                         print footer[line]
 168                 }
 169                 if (unprinted) {
 170                         print "Change-Id: I'"$id"'"
 171                 }
 172         }' "$MSG" > "$T" && mv "$T" "$MSG" || rm -f "$T"
 173 }
 174 _gen_ChangeIdInput() {
 175         echo "tree `git write-tree`"
 176         if parent=`git rev-parse "HEAD^0" 2>/dev/null`
 177         then
 178                 echo "parent $parent"
 179         fi
 180         echo "author `git var GIT_AUTHOR_IDENT`"
 181         echo "committer `git var GIT_COMMITTER_IDENT`"
 182         echo
 183         printf '%s' "$clean_message"
 184 }
 185 _gen_ChangeId() {
 186         _gen_ChangeIdInput |
 187         git hash-object -t commit --stdin
 188 }
 189
 190
 191 add_ChangeId
 192
 193 # Perform gem5-specific commit message style check
 194 ./util/git-commit-msg.py $MSG