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commit-msg

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    commit-msg 4.26 KiB
    #!/bin/sh
    # From Gerrit Code Review 2.11.3
    #
    # Part of Gerrit Code Review (http://code.google.com/p/gerrit/)
    #
    # Copyright (C) 2009 The Android Open Source Project
    #
    # Licensed under the Apache License, Version 2.0 (the "License");
    # you may not use this file except in compliance with the License.
    # You may obtain a copy of the License at
    #
    # http://www.apache.org/licenses/LICENSE-2.0
    #
    # Unless required by applicable law or agreed to in writing, software
    # distributed under the License is distributed on an "AS IS" BASIS,
    # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    # See the License for the specific language governing permissions and
    # limitations under the License.
    #
    
    unset GREP_OPTIONS
    
    CHANGE_ID_AFTER="Bug|Issue"
    MSG="$1"
    
    # Check for, and add if missing, a unique Change-Id
    #
    add_ChangeId() {
    	clean_message=`sed -e '
    		/^diff --git .*/{
    			s///
    			q
    		}
    		/^Signed-off-by:/d
    		/^#/d
    	' "$MSG" | git stripspace`
    	if test -z "$clean_message"
    	then
    		return
    	fi
    
    	if test "false" = "`git config --bool --get gerrit.createChangeId`"
    	then
    		return
    	fi
    
    	# Does Change-Id: already exist? if so, exit (no change).
    	if grep -i '^Change-Id:' "$MSG" >/dev/null
    	then
    		return
    	fi
    
    	id=`_gen_ChangeId`
    	T="$MSG.tmp.$$"
    	AWK=awk
    	if [ -x /usr/xpg4/bin/awk ]; then
    		# Solaris AWK is just too broken
    		AWK=/usr/xpg4/bin/awk
    	fi
    
    	# How this works:
    	# - parse the commit message as (textLine+ blankLine*)*
    	# - assume textLine+ to be a footer until proven otherwise
    	# - exception: the first block is not footer (as it is the title)
    	# - read textLine+ into a variable
    	# - then count blankLines
    	# - once the next textLine appears, print textLine+ blankLine* as these
    	#   aren't footer
    	# - in END, the last textLine+ block is available for footer parsing
    	$AWK '
    	BEGIN {
    		# while we start with the assumption that textLine+
    		# is a footer, the first block is not.
    		isFooter = 0
    		footerComment = 0
    		blankLines = 0
    	}
    
    	# Skip lines starting with "#" without any spaces before it.
    	/^#/ { next }
    
    	# Skip the line starting with the diff command and everything after it,
    	# up to the end of the file, assuming it is only patch data.
    	# If more than one line before the diff was empty, strip all but one.
    	/^diff --git / {
    		blankLines = 0
    		while (getline) { }
    		next
    	}
    
    	# Count blank lines outside footer comments
    	/^$/ && (footerComment == 0) {
    		blankLines++
    		next
    	}
    
    	# Catch footer comment
    	/^\[[a-zA-Z0-9-]+:/ && (isFooter == 1) {
    		footerComment = 1
    	}
    
    	/]$/ && (footerComment == 1) {
    		footerComment = 2
    	}
    
    	# We have a non-blank line after blank lines. Handle this.
    	(blankLines > 0) {
    		print lines
    		for (i = 0; i < blankLines; i++) {
    			print ""
    		}
    
    		lines = ""
    		blankLines = 0
    		isFooter = 1
    		footerComment = 0
    	}
    
    	# Detect that the current block is not the footer
    	(footerComment == 0) && (!/^\[?[a-zA-Z0-9-]+:/ || /^[a-zA-Z0-9-]+:\/\//) {
    		isFooter = 0
    	}
    
    	{
    		# We need this information about the current last comment line
    		if (footerComment == 2) {
    			footerComment = 0
    		}
    		if (lines != "") {
    			lines = lines "\n";
    		}
    		lines = lines $0
    	}
    
    	# Footer handling:
    	# If the last block is considered a footer, splice in the Change-Id at the
    	# right place.
    	# Look for the right place to inject Change-Id by considering
    	# CHANGE_ID_AFTER. Keys listed in it (case insensitive) come first,
    	# then Change-Id, then everything else (eg. Signed-off-by:).
    	#
    	# Otherwise just print the last block, a new line and the Change-Id as a
    	# block of its own.
    	END {
    		unprinted = 1
    		if (isFooter == 0) {
    			print lines "\n"
    			lines = ""
    		}
    		changeIdAfter = "^(" tolower("'"$CHANGE_ID_AFTER"'") "):"
    		numlines = split(lines, footer, "\n")
    		for (line = 1; line <= numlines; line++) {
    			if (unprinted && match(tolower(footer[line]), changeIdAfter) != 1) {
    				unprinted = 0
    				print "Change-Id: I'"$id"'"
    			}
    			print footer[line]
    		}
    		if (unprinted) {
    			print "Change-Id: I'"$id"'"
    		}
    	}' "$MSG" > "$T" && mv "$T" "$MSG" || rm -f "$T"
    }
    _gen_ChangeIdInput() {
    	echo "tree `git write-tree`"
    	if parent=`git rev-parse "HEAD^0" 2>/dev/null`
    	then
    		echo "parent $parent"
    	fi
    	echo "author `git var GIT_AUTHOR_IDENT`"
    	echo "committer `git var GIT_COMMITTER_IDENT`"
    	echo
    	printf '%s' "$clean_message"
    }
    _gen_ChangeId() {
    	_gen_ChangeIdInput |
    	git hash-object -t commit --stdin
    }
    
    
    add_ChangeId