[PATCH] cg-admin-rewritehist: Seed the commit map with the parents specified with -r.

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When the first commit is manufactured, its parents are looked up in the
commit map. However, without this patch the map is always empty at that time.
If the entire history is rewritten, this is no problem because the first
commit does not have any parents anyway. However, if -r is used to constrain
rewriting to only part of the history, this first commit is manufactured
incorrectly without parents because 'cat' fails.

Signed-off-by: Johannes Sixt <johannes.sixt@xxxxxxxxxx>

---

 cg-admin-rewritehist |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

ec09427d1fb4097c15fd6df4f07049a536bb7d2c
diff --git a/cg-admin-rewritehist b/cg-admin-rewritehist
index 9c49d80..b72c641 100755
--- a/cg-admin-rewritehist
+++ b/cg-admin-rewritehist
@@ -138,6 +138,7 @@ _git_requires_root=1
 
 tempdir=.git-rewrite
 startrev=
+startrevparents=
 filter_env=
 filter_tree=
 filter_index=
@@ -149,6 +150,7 @@ while optparse; do
 		tempdir="$OPTARG"
 	elif optparse -r=; then
 		startrev="^$OPTARG $OPTARG $startrev"
+		startrevparents="$OPTARG $startrevparents"
 	elif optparse --env-filter=; then
 		filter_env="$OPTARG"
 	elif optparse --tree-filter=; then
@@ -182,6 +184,11 @@ ret=0
 
 
 mkdir ../map # map old->new commit ids for rewriting parents
+
+# seed with identity mappings for the parents where we start off
+for commit in $startrevparents; do
+	echo $commit > ../map/$commit
+done
 
 git-rev-list --topo-order HEAD $startrev | tac >../revs
 commits=$(cat ../revs | wc -l)
-- 
1.3.0.rc2
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