try to autodetect and fix upstream rebase
authorRudolf Polzer <divverent@alientrap.org>
Wed, 4 Aug 2010 10:26:57 +0000 (12:26 +0200)
committerRudolf Polzer <divverent@alientrap.org>
Wed, 4 Aug 2010 10:31:23 +0000 (12:31 +0200)
all

diff --git a/all b/all
index cdfcd0b5891b41cdcc3ba4196570d41fe95d4734..14d2eeb602bf4c258ad9063ceb48bb4f024d61ba 100755 (executable)
--- a/all
+++ b/all
@@ -184,7 +184,57 @@ fi
 cmd=$1
 shift
 
 cmd=$1
 shift
 
+fix_upstream_rebase()
+{
+       if [ -z "$r_me" ] || [ -z "$r_other" ]; then
+               return
+       fi
+       r_base=`git merge-base "$r_me" "$r_other"`
+
+       # no merge-base? upstream did filter-branch
+       if [ -n "$r_base" ]; then
+               # otherwise, check if the two histories are "similar"
+               r_l_me=`git log --pretty="format:%s" "$r_other".."$r_me" | grep -v "^Merged" | sort -u`
+               r_l_other=`git log --pretty="format:%s" "$r_me".."$r_other" | grep -v "^Merged" | sort -u`
+
+               # heuristics: upstream rebase/filter-branch if more than 50% of the commits of one of the sides are in the other too
+               r_lc_me=`echo "$r_l_me" | wc -l`
+               r_lc_other=`echo "$r_l_other" | wc -l`
+               r_lc_together=`{ echo "$r_l_me"; echo "$r_l_other"; } | sort -u | wc -l`
+               r_lc_same=$(($r_lc_me + $r_lc_other - $r_lc_together))
+
+               if [ $(( $r_lc_same * 2 )) -le $(( $r_lc_me )) ] && [ $(( $r_lc_same * 2 )) -le $(( $r_lc_other )) ]; then
+                       if yesno "Probable upstream rebase detected, automatically fix?" 'git log --oneline --graph --left-right "$r_l_other".."$r_l_me"'; then
+                               git reset --hard "$r_me"
+                               git pull --rebase
+                               return 1
+                       fi
+               fi
+       fi
+
+       return 0
+}
+
+fix_upstream_rebase_mergeok()
+{
+       r_me=`git rev-parse --revs-only HEAD^1 2>/dev/null || true`
+       r_other=`git rev-parse --revs-only HEAD^2 2>/dev/null || true`
+       fix_upstream_rebase
+}
+
+fix_upstream_rebase_mergefail()
+{
+       r_me=`git rev-parse --revs-only HEAD 2>/dev/null || true`
+       r_other=`git rev-parse --revs-only MERGE_HEAD 2>/dev/null || true`
+       fix_upstream_rebase
+}
+
 case "$cmd" in
 case "$cmd" in
+       fix_upstream_rebase)
+               for d in $repos; do
+                       fix_upstream_rebase_mergefail && fix_upstream_rebase_mergeok
+               done
+               ;;
        update|pull)
                allow_pull=true
                if [ x"$1" = x"-N" ]; then
        update|pull)
                allow_pull=true
                if [ x"$1" = x"-N" ]; then
@@ -205,9 +255,12 @@ case "$cmd" in
                                        r=${r#refs/heads/}
                                        if git config branch.$r.remote >/dev/null 2>&1; then
                                                if ! verbose git pull; then
                                        r=${r#refs/heads/}
                                        if git config branch.$r.remote >/dev/null 2>&1; then
                                                if ! verbose git pull; then
+                                                       fix_upstream_rebase_mergefailed || true
                                                        check_mergeconflict "$d"
                                                        echo "Pulling failed. Press ENTER to continue, or Ctrl-C to abort."
                                                        read -r DUMMY
                                                        check_mergeconflict "$d"
                                                        echo "Pulling failed. Press ENTER to continue, or Ctrl-C to abort."
                                                        read -r DUMMY
+                                               else
+                                                       fix_upstream_rebase_mergeok || true
                                                fi
                                        fi
 
                                                fi
                                        fi