hgmerge
author Radoslaw Szkodzinski <astralstorm@gorzow.mm.pl>
Mon, 06 Feb 2006 17:32:10 -0600
changeset 1701 4ba8fe499df2
parent 1700 e2f91e0acbb8
child 1770 4eea6a747c27
permissions -rwxr-xr-x
hgmerge: various cleanups Details: - put temporary file names into variables - make all temporary file names end with random part - cleanup FileMerge handling - do not use hardlinks in FileMerge change test (breaks on FAT) - try harder to keep file mtime unchanged in case of failed merge
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#!/bin/sh
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#
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# hgmerge - default merge helper for Mercurial
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#
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# This tries to find a way to do three-way merge on the current system.
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# The result ought to end up in $1.
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set -e # bail out quickly on failure
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LOCAL="$1"
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BASE="$2"
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OTHER="$3"
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if [ -z "$EDITOR" ]; then
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    EDITOR="vi"
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fi
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# find decent versions of our utilities, insisting on the GNU versions where we
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# need to
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MERGE=merge
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DIFF3=gdiff3
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DIFF=gdiff
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PATCH=gpatch
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type $MERGE >/dev/null 2>&1 || MERGE=
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type $DIFF3 >/dev/null 2>&1 || DIFF3=diff3
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type $DIFF  >/dev/null 2>&1 || DIFF=diff
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type $PATCH >/dev/null 2>&1 || PATCH=patch
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$DIFF3 --version >/dev/null 2>&1 || DIFF3=
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# find optional visual utilities
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FILEMERGE='/Developer/Applications/Utilities/FileMerge.app/Contents/MacOS/FileMerge'
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KDIFF3=kdiff3
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TKDIFF=tkdiff
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type $FILEMERGE >/dev/null 2>&1 || FILEMERGE=
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type $KDIFF3    >/dev/null 2>&1 || KDIFF3=
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type $TKDIFF    >/dev/null 2>&1 || TKDIFF=
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# random part of names
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RAND="$RANDOM.$RANDOM.$RANDOM.$$"
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# temporary directory for diff+patch merge
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HGTMP="${TMPDIR-/tmp}/hgmerge.$RAND"
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# backup file
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BACKUP="$LOCAL.orig.$RAND"
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# file used to test for file change
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CHGTEST="$LOCAL.chg.$RAND"
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# put all your required cleanup here
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cleanup() {
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    rm -f "$BACKUP" "$CHGTEST"
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    rm -rf "$HGTMP"
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}
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# functions concerning program exit
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success() {
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    cleanup
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    exit 0
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}
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failure() {
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    echo "merge failed" 1>&2
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    mv "$BACKUP" "$LOCAL"
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    cleanup
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    exit 1
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}
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# Clean up when interrupted
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trap "failure" 1 2 3 6 15 # HUP INT QUIT ABRT TERM
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# Back up our file (and try hard to keep the mtime unchanged)
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mv "$LOCAL" "$BACKUP"
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cp "$BACKUP" "$LOCAL"
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# Attempt to do a non-interactive merge
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if [ -n "$MERGE" ]; then
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    $MERGE "$LOCAL" "$BASE" "$OTHER" 2> /dev/null && success
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    cp "$BACKUP" "$LOCAL"
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elif [ -n "$DIFF3" ]; then
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    echo $DIFF3 -m "$BACKUP" "$BASE" "$OTHER"
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    $DIFF3 -m "$BACKUP" "$BASE" "$OTHER" > "$LOCAL" && success
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    if [ $? -eq 2 ]; then
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        echo "$DIFF3 failed! Exiting." 1>&2
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        cp "$BACKUP" "$LOCAL"
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        failure
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    fi
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    cp "$BACKUP" "$LOCAL"
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fi
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# on MacOS X try FileMerge.app, shipped with Apple's developer tools
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if [ -n "$FILEMERGE" ]; then
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    cp "$BACKUP" "$LOCAL"
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    cp "$BACKUP" "$CHGTEST"
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    # filemerge prefers the right by default
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    $FILEMERGE -left "$OTHER" -right "$LOCAL" -ancestor "$BASE" -merge "$LOCAL"
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    [ $? -ne 0 ] && echo "FileMerge failed to launch" && failure
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    if test "$LOCAL" -nt "$CHGTEST"
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    then
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        success
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    else
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        echo "$LOCAL seems unchanged. Was the merge successful?"
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        select answer in yes no
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        do
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            test "$answer" == "yes" && success || failure
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        done
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    fi
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    failure
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fi
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if [ -n "$DISPLAY" ]; then
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    # try using kdiff3, which is fairly nice
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    if [ -n "$KDIFF3" ]; then
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	$KDIFF3 --auto "$BASE" "$LOCAL" "$OTHER" -o "$LOCAL" || failure
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	success
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    fi
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    # try using tkdiff, which is a bit less sophisticated
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    if [ -n "$TKDIFF" ]; then
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	$TKDIFF "$LOCAL" "$OTHER" -a "$BASE" -o "$LOCAL" || failure
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	success
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    fi
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fi
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# Attempt to do a merge with $EDITOR
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if [ -n "$MERGE" ]; then
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    echo "conflicts detected in $LOCAL"
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    $MERGE "$LOCAL" "$BASE" "$OTHER" 2>/dev/null || $EDITOR "$LOCAL"
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    success
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fi
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if [ -n "$DIFF3" ]; then
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    echo "conflicts detected in $LOCAL"
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    $DIFF3 -m "$BACKUP" "$BASE" "$OTHER" > "$LOCAL" || {
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        case $? in
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            1)
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                $EDITOR "$LOCAL" ;;
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            2)  echo "$DIFF3 failed! Exiting." 1>&2
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                cp "$BACKUP" "$LOCAL"
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                failure ;;
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        esac
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        success
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    }
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fi
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# attempt to manually merge with diff and patch
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if [ -n "$DIFF" -a -n "$PATCH" ]; then
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    (umask 077 && mkdir "$HGTMP") || {
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	echo "Could not create temporary directory $HGTMP" 1>&2
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	failure
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    }
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    $DIFF -u "$BASE" "$OTHER" > "$HGTMP/diff" || :
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    if $PATCH "$LOCAL" < "$HGTMP/diff"; then
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	success
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    else
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	# If rejects are empty after using the editor, merge was ok
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	$EDITOR "$LOCAL" "$LOCAL.rej" && test -s "$LOCAL.rej" || success
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    fi
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    failure
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fi
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echo "hgmerge: unable to find merge, tkdiff, kdiff3, or diff+patch!"
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failure