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Killing a migration from WORM to SHA256 with ^C breaks things; future attempts to do the migration fail:
#!/bin/bash
BASE=/tmp/migrate-bug
set -x
chmod -R +w $BASE
rm -rf $BASE
mkdir -p $BASE
cd $BASE
# create annex
git init .
git annex init
# make a big (sparse) file and add it
dd if=/dev/zero of=bigfile bs=1 count=0 seek=1G
git annex add --backend WORM bigfile
git commit -m 'added bigfile'
# look at status
git annex status
# now migrate it, but kill migration during checksum
# Simulate ^C by making a new process group and sending SIGINT
setsid git annex migrate --backend SHA256 bigfile &
PID=$!
sleep 1
kill -INT -$PID
wait
# look at status
git annex status
# this migration fails
git annex migrate --backend SHA256 bigfile
# but fsck says everything's OK
git annex fsck
The error:
migrate bigfile
git-annex: /tmp/migrate-bug/.git/annex/objects/K9/V1/WORM-s1073741824-m1321566308--bigfile/WORM-s1073741824-m1321566308--bigfile: createLink: already exists (File exists)
failed
git-annex: migrate: 1 failed
> Fixed it to delete the stale temp file. [[done]]
>
> Thanks for making such clear test cases, Jim! --[[Joey]]
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