branchcache: skip entries that are topological heads in the on disk file
In the majority of cases, topological heads are also branch heads. We have
efficient way to get the topological heads and efficient way to retrieve
their branch information. So there is little value in putting them in the branch
cache file explicitly. On the contrary, writing them explicitly tend to create
very large cache file that are inefficient to read and update.
So the branch cache v3 format is no longer including them. This changeset focus
on the format aspect and have no focus on the performance aspect. We will cover
that later.
$ hg init repo
$ cd repo
$ cat << EOF > a
> Small Mathematical Series.
> One
> Two
> Three
> Four
> Five
> Hop we are done.
> EOF
$ hg add a
$ hg commit -m ancestor
$ cat << EOF > a
> Small Mathematical Series.
> 1
> 2
> 3
> 4
> 5
> Hop we are done.
> EOF
$ hg commit -m branch1
$ hg co 0
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cat << EOF > a
> Small Mathematical Series.
> 1
> 2
> 3
> 6
> 8
> Hop we are done.
> EOF
$ hg commit -m branch2
created new head
$ hg merge 1
merging a
warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
[1]
$ hg id
618808747361+c0c68e4fe667+ tip
$ echo "[commands]" >> $HGRCPATH
$ echo "status.verbose=true" >> $HGRCPATH
$ hg status
M a
? a.orig
# The repository is in an unfinished *merge* state.
# Unresolved merge conflicts:
#
# a
#
# To mark files as resolved: hg resolve --mark FILE
# To continue: hg commit
# To abort: hg merge --abort
$ hg status -Tjson
[
{
"itemtype": "file",
"path": "a",
"status": "M",
"unresolved": true
},
{
"itemtype": "file",
"path": "a.orig",
"status": "?"
},
{
"itemtype": "morestatus",
"unfinished": "merge",
"unfinishedmsg": "To continue: hg commit\nTo abort: hg merge --abort"
}
]
$ hg status -0
M a\x00? a.orig\x00 (no-eol) (esc)
$ cat a
Small Mathematical Series.
1
2
3
<<<<<<< working copy: 618808747361 - test: branch2
6
8
=======
4
5
>>>>>>> merge rev: c0c68e4fe667 - test: branch1
Hop we are done.
$ hg status --config commands.status.verbose=0
M a
? a.orig
Verify custom conflict markers
$ hg up -q --clean .
$ cat <<EOF >> .hg/hgrc
> [command-templates]
> mergemarker = '{author} {rev}'
> EOF
$ hg merge 1
merging a
warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
[1]
$ cat a
Small Mathematical Series.
1
2
3
<<<<<<< working copy: test 2
6
8
=======
4
5
>>>>>>> merge rev: test 1
Hop we are done.
Verify custom conflict markers with legacy config name
$ hg up -q --clean .
$ cat <<EOF >> .hg/hgrc
> [ui]
> mergemarkertemplate = '{author} {rev}'
> EOF
$ hg merge 1
merging a
warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
[1]
$ cat a
Small Mathematical Series.
1
2
3
<<<<<<< working copy: test 2
6
8
=======
4
5
>>>>>>> merge rev: test 1
Hop we are done.
Verify line splitting of custom conflict marker which causes multiple lines
$ hg up -q --clean .
$ cat >> .hg/hgrc <<EOF
> [command-templates]
> mergemarker={author} {rev}\nfoo\nbar\nbaz
> EOF
$ hg -q merge 1
warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
[1]
$ cat a
Small Mathematical Series.
1
2
3
<<<<<<< working copy: test 2
6
8
=======
4
5
>>>>>>> merge rev: test 1
Hop we are done.
Verify line trimming of custom conflict marker using multi-byte characters
$ hg up -q --clean .
$ "$PYTHON" <<EOF
> fp = open('logfile', 'wb')
> fp.write(b'12345678901234567890123456789012345678901234567890' +
> b'1234567890') # there are 5 more columns for 80 columns
>
> # 2 x 4 = 8 columns, but 3 x 4 = 12 bytes
> fp.write(u'\u3042\u3044\u3046\u3048'.encode('utf-8'))
>
> fp.close()
> EOF
$ hg add logfile
$ hg --encoding utf-8 commit --logfile logfile
$ cat >> .hg/hgrc <<EOF
> [command-templates]
> mergemarker={desc|firstline}
> EOF
$ hg -q --encoding utf-8 merge 1
warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
[1]
$ cat a
Small Mathematical Series.
1
2
3
<<<<<<< working copy: 1234567890123456789012345678901234567890123456789012345...
6
8
=======
4
5
>>>>>>> merge rev: branch1
Hop we are done.
Verify basic conflict markers
$ hg up -q --clean 2
$ printf "\n[ui]\nmergemarkers=basic\n" >> .hg/hgrc
$ hg merge 1
merging a
warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
[1]
$ cat a
Small Mathematical Series.
1
2
3
<<<<<<< working copy
6
8
=======
4
5
>>>>>>> merge rev
Hop we are done.
internal:merge3
$ hg up -q --clean .
$ hg merge 1 --tool internal:merge3
merging a
warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
[1]
$ cat a
Small Mathematical Series.
<<<<<<< working copy
1
2
3
6
8
||||||| common ancestor
One
Two
Three
Four
Five
=======
1
2
3
4
5
>>>>>>> merge rev
Hop we are done.
internal:mergediff
$ hg co -C 1
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cat << EOF > a
> Small Mathematical Series.
> 1
> 2
> 3
> 4
> 4.5
> 5
> Hop we are done.
> EOF
$ hg co -m 2 -t internal:mergediff
merging a
warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges
[1]
$ cat a
Small Mathematical Series.
1
2
3
<<<<<<<
------- working copy parent
+++++++ working copy
4
+4.5
5
======= destination
6
8
>>>>>>>
Hop we are done.
Test the same thing as above but modify a bit more so we instead get the working
copy in full and the diff from base to destination.
$ hg co -C 1
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cat << EOF > a
> Small Mathematical Series.
> 1
> 2
> 3.5
> 4.5
> 5.5
> Hop we are done.
> EOF
$ hg co -m 2 -t internal:mergediff
merging a
warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges
[1]
$ cat a
Small Mathematical Series.
1
2
<<<<<<<
======= working copy
3.5
4.5
5.5
------- working copy parent
+++++++ destination
3
-4
-5
+6
+8
>>>>>>>
Hop we are done.
Add some unconflicting changes on each head, to make sure we really
are merging, unlike :local and :other
$ hg up -C
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
updated to "e0693e20f496: 123456789012345678901234567890123456789012345678901234567890????"
1 other heads for branch "default"
$ printf "\n\nEnd of file\n" >> a
$ hg ci -m "Add some stuff at the end"
$ hg up -r 1
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ printf "Start of file\n\n\n" > tmp
$ cat a >> tmp
$ mv tmp a
$ hg ci -m "Add some stuff at the beginning"
Now test :merge-other and :merge-local
$ hg merge
merging a
warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
1 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
[1]
$ hg resolve --tool :merge-other a
merging a
(no more unresolved files)
$ cat a
Start of file
Small Mathematical Series.
1
2
3
6
8
Hop we are done.
End of file
$ hg up -C
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
updated to "18b51d585961: Add some stuff at the beginning"
1 other heads for branch "default"
$ hg merge --tool :merge-local
merging a
1 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ cat a
Start of file
Small Mathematical Series.
1
2
3
4
5
Hop we are done.
End of file