localrepo._tag: add a seek before writing the new tag
Some systems require a seek (or flush) between read and write
operations on the same file object.
This should fix
issue838.
#!/bin/sh
mkdir t
cd t
hg init
echo "added file1" > file1
echo "another line of text" >> file1
echo "added file2" > file2
hg add file1 file2
hg commit -m "added file1 and file2" -d "1000000 0" -u user
echo "changed file1" >> file1
hg commit -m "changed file1" -d "1000000 0" -u user
hg -q log
hg id
hg update -C 0
hg id
echo "changed file1" >> file1
hg id
hg revert --no-backup --all
hg diff
hg status
hg id
hg update
hg diff
hg status
hg id
hg update -C 0
echo "changed file1 different" >> file1
hg update
hg diff --nodates
hg status
hg id
hg revert --no-backup --all
hg diff
hg status
hg id
hg revert -r tip --no-backup --all
hg diff
hg status
hg id
hg update -C
hg diff
hg status
hg id