Mercurial > hg
view hgmerge @ 917:7f3f55903496
Fix hg clone race with writer
Most read operations in hg don't need locks because we order reads and
writes for consistency. Clone is an exception to this as we're copying
entire file histories and could end up with more file history copied
than we have commits.
For now, make clone take a lock on the source repo. Non-hardlinked
clone should eventually be changed to use lockless pull.
author | mpm@selenic.com |
---|---|
date | Tue, 16 Aug 2005 14:53:47 -0800 |
parents | 9c918287d10b |
children | 696851b1bba9 |
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#!/bin/sh # # hgmerge - default merge helper for Mercurial # # This tries to find a way to do three-way merge on the current system. # The result ought to end up in $1. set -e # bail out quickly on failure LOCAL="$1" BASE="$2" OTHER="$3" if [ -z "$EDITOR" ]; then EDITOR="vi" fi # Back up our file cp "$LOCAL" "$LOCAL.orig" # Attempt to do a non-interactive merge if type merge > /dev/null 2>&1; then merge "$LOCAL" "$BASE" "$OTHER" 2> /dev/null && exit 0 cp "$LOCAL.orig" "$LOCAL" elif type diff3 > /dev/null 2>&1; then diff3 -m "$LOCAL.orig" "$BASE" "$OTHER" > "$LOCAL" && exit 0 cp "$LOCAL.orig" "$LOCAL" fi if [ -n "$DISPLAY" ]; then # try using kdiff3, which is fairly nice if type kdiff3 > /dev/null 2>&1; then kdiff3 --auto "$BASE" "$LOCAL" "$OTHER" -o "$LOCAL" || exit 1 exit 0 fi # try using tkdiff, which is a bit less sophisticated if type tkdiff > /dev/null 2>&1; then tkdiff "$LOCAL" "$OTHER" -a "$BASE" -o "$LOCAL" || exit 1 exit 0 fi fi # Attempt to do a merge with $EDITOR if type merge > /dev/null 2>&1; then echo "conflicts detected in $LOCAL" merge "$LOCAL" "$BASE" "$OTHER" 2>/dev/null || $EDITOR "$LOCAL" exit 0 fi if type diff3 > /dev/null 2>&1; then echo "conflicts detected in $LOCAL" diff3 -m "$LOCAL.orig" "$BASE" "$OTHER" > "$LOCAL" || $EDITOR "$LOCAL" exit 0 fi HGTMP="" cleanup_exit() { rm -rf "$HGTMP" } # attempt to manually merge with diff and patch if type diff > /dev/null 2>&1 && type patch > /dev/null 2>&1; then # Remove temporary files even if we get interrupted trap "cleanup_exit" 0 # normal exit trap "exit 1" 1 2 3 6 15 # HUP INT QUIT ABRT TERM HGTMP="${TMPDIR-/tmp}/hgmerge.$RANDOM.$RANDOM.$RANDOM.$$" (umask 077 && mkdir "$HGTMP") || { echo "Could not create temporary directory! Exiting." 1>&2 exit 1 } diff -u "$BASE" "$OTHER" > "$HGTMP/diff" if patch "$LOCAL" < "$HGTMP/diff"; then exit 0 else # If rejects are empty after using the editor, merge was ok $EDITOR "$LOCAL" "$LOCAL.rej" && test -s "$LOCAL.rej" || exit 0 fi exit 1 fi echo "hgmerge: unable to find merge, tkdiff, kdiff3, or diff+patch!" exit 1