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#!/bin/bash
. shellopts.sh
set -e
create()
{
echo "$1" >"$1"
git add "$1"
}
check()
{
echo
echo "check:" "$@"
if "$@"; then
echo ok
return 0
else
echo FAILED
exit 1
fi
}
check_equal()
{
echo
echo "check a:" "{$1}"
echo " b:" "{$2}"
if [ "$1" = "$2" ]; then
return 0
else
echo FAILED
exit 1
fi
}
fixnl()
{
t=""
while read x; do
t="$t$x "
done
echo $t
}
multiline()
{
while read x; do
set -- $x
for d in "$@"; do
echo "$d"
done
done
}
rm -rf mainline subproj
mkdir mainline subproj
cd subproj
git init
create sub1
git commit -m 'sub1'
git branch sub1
git branch -m master subproj
check true
create sub2
git commit -m 'sub2'
git branch sub2
create sub3
git commit -m 'sub3'
git branch sub3
cd ../mainline
git init
create main4
git commit -m 'main4'
git branch -m master mainline
git fetch ../subproj sub1
git branch sub1 FETCH_HEAD
git subtree add --prefix=subdir FETCH_HEAD
# this shouldn't actually do anything, since FETCH_HEAD is already a parent
git merge -m 'merge -s -ours' -s ours FETCH_HEAD
create subdir/main-sub5
git commit -m 'main-sub5'
create main6
git commit -m 'main6 boring'
create subdir/main-sub7
git commit -m 'main-sub7'
git fetch ../subproj sub2
git branch sub2 FETCH_HEAD
git subtree merge --prefix=subdir FETCH_HEAD
git branch pre-split
spl1=$(git subtree split --annotate='*' \
--prefix subdir --onto FETCH_HEAD --rejoin)
echo "spl1={$spl1}"
git branch spl1 "$spl1"
create subdir/main-sub8
git commit -m 'main-sub8'
cd ../subproj
git fetch ../mainline spl1
git branch spl1 FETCH_HEAD
git merge FETCH_HEAD
create sub9
git commit -m 'sub9'
cd ../mainline
split2=$(git subtree split --annotate='*' --prefix subdir --rejoin)
git branch split2 "$split2"
create subdir/main-sub10
git commit -m 'main-sub10'
spl3=$(git subtree split --annotate='*' --prefix subdir --rejoin)
git branch spl3 "$spl3"
cd ../subproj
git fetch ../mainline spl3
git branch spl3 FETCH_HEAD
git merge FETCH_HEAD
git branch subproj-merge-spl3
chkm="main4 main6"
chkms="main-sub10 main-sub5 main-sub7 main-sub8"
chkms_sub=$(echo $chkms | multiline | sed 's,^,subdir/,' | fixnl)
chks="sub1 sub2 sub3 sub9"
chks_sub=$(echo $chks | multiline | sed 's,^,subdir/,' | fixnl)
# make sure exactly the right set of files ends up in the subproj
subfiles=$(git ls-files | fixnl)
check_equal "$subfiles" "$chkms $chks"
# make sure the subproj history *only* contains commits that affect the subdir.
allchanges=$(git log --name-only --pretty=format:'' | sort | fixnl)
check_equal "$allchanges" "$chkms $chks"
cd ../mainline
git fetch ../subproj subproj-merge-spl3
git branch subproj-merge-spl3 FETCH_HEAD
git subtree pull --prefix=subdir ../subproj subproj-merge-spl3
# make sure exactly the right set of files ends up in the mainline
mainfiles=$(git ls-files | fixnl)
check_equal "$mainfiles" "$chkm $chkms_sub $chks_sub"
# make sure each filename changed exactly once in the entire history.
# 'main-sub??' and '/subdir/main-sub??' both change, because those are the
# changes that were split into their own history. And 'subdir/sub??' never
# change, since they were *only* changed in the subtree branch.
allchanges=$(git log --name-only --pretty=format:'' | sort | fixnl)
check_equal "$allchanges" "$chkm $chkms $chks $chkms_sub"
# make sure the --rejoin commits never make it into subproj
check_equal "$(git log --pretty=format:'%s' HEAD^2 | grep -i split)" ""
# make sure no 'git subtree' tagged commits make it into subproj. (They're
# meaningless to subproj since one side of the merge refers to the mainline)
check_equal "$(git log --pretty=format:'%s%n%b' HEAD^2 | grep 'git-subtree.*:')" ""
# make sure no patch changes more than one file. The original set of commits
# changed only one file each. A multi-file change would imply that we pruned
# commits too aggressively.
joincommits()
{
commit=
all=
while read x y; do
echo "{$x}" >&2
if [ -z "$x" ]; then
continue
elif [ "$x" = "commit:" ]; then
if [ -n "$commit" ]; then
echo "$commit $all"
all=
fi
commit="$y"
else
all="$all $y"
fi
done
echo "$commit $all"
}
x=
git log --pretty=format:'commit: %H' | joincommits |
( while read commit a b; do
echo "Verifying commit $commit"
check_equal "$b" ""
x=1
done
check_equal "$x" 1
) || exit 1
echo
echo 'ok'
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