evolve: handle relocation during divergence resolution producing no changes
When resolving divergence and the two divergent commits have different
parents, we start by rebasing one of them to have the same parent as
the other. That step can result in no changes to commit. When it does,
we would crash with a TypeError before this patch.
This patch fixes it by instead creating an empty commit in that
scenario. The existing code then continues to attempt to merge it,
which produces no changes, and no commit is created on top. The other
side of the divergence is marked as successor as usual, so orphans
from the side that became empty will be evolved to the right place
(see test).
Testing obslog and other commands accessing obsolete revisions.
Global setup
============
$ . $TESTDIR/testlib/obshistory_setup.sh
Test output with amended + folded commit
========================================
Test setup
----------
$ hg init $TESTTMP/local-amend-fold
$ cd $TESTTMP/local-amend-fold
$ mkcommit ROOT
$ mkcommit A0
$ mkcommit B0
$ hg amend -m "B1"
$ hg log --hidden -G
@ changeset: 3:b7ea6d14e664
| tag: tip
| parent: 1:471f378eab4c
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: B1
|
| x changeset: 2:0dec01379d3b
|/ user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| obsolete: reworded using amend as 3:b7ea6d14e664
| summary: B0
|
o changeset: 1:471f378eab4c
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: A0
|
o changeset: 0:ea207398892e
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: ROOT
$ hg fold --exact -r 'desc(A0) + desc(B1)' --date "0 0" -m "C0"
2 changesets folded
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg log --hidden -G
@ changeset: 4:eb5a0daa2192
| tag: tip
| parent: 0:ea207398892e
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: C0
|
| x changeset: 3:b7ea6d14e664
| | parent: 1:471f378eab4c
| | user: test
| | date: Thu Jan 01 00:00:00 1970 +0000
| | obsolete: folded using fold as 4:eb5a0daa2192
| | summary: B1
| |
| | x changeset: 2:0dec01379d3b
| |/ user: test
| | date: Thu Jan 01 00:00:00 1970 +0000
| | obsolete: reworded using amend as 3:b7ea6d14e664
| | summary: B0
| |
| x changeset: 1:471f378eab4c
|/ user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| obsolete: folded using fold as 4:eb5a0daa2192
| summary: A0
|
o changeset: 0:ea207398892e
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: ROOT
Actual test
-----------
Check that obslog on head shows a coherent graph
$ hg obslog eb5a0daa2192 --patch
@ eb5a0daa2192 (4) C0
|\
x | 471f378eab4c (1) A0
/ folded(description, content) as eb5a0daa2192 using fold by test (Thu Jan 01 00:00:00 1970 +0000)
| diff -r 471f378eab4c -r eb5a0daa2192 changeset-description
| --- a/changeset-description
| +++ b/changeset-description
| @@ -1,1 +1,1 @@
| -A0
| +C0
|
| diff -r 471f378eab4c -r eb5a0daa2192 B0
| --- /dev/null Thu Jan 01 00:00:00 1970 +0000
| +++ b/B0 Thu Jan 01 00:00:00 1970 +0000
| @@ -0,0 +1,1 @@
| +B0
|
|
x b7ea6d14e664 (3) B1
| folded(description, parent, content) as eb5a0daa2192 using fold by test (Thu Jan 01 00:00:00 1970 +0000)
| (No patch available, changesets rebased)
|
x 0dec01379d3b (2) B0
reworded(description) as b7ea6d14e664 using amend by test (Thu Jan 01 00:00:00 1970 +0000)
diff -r 0dec01379d3b -r b7ea6d14e664 changeset-description
--- a/changeset-description
+++ b/changeset-description
@@ -1,1 +1,1 @@
-B0
+B1
Check that obslog on A0 with all option shows everything
$ hg obslog 1 --hidden --all --patch
@ eb5a0daa2192 (4) C0
|\
x | 471f378eab4c (1) A0
/ folded(description, content) as eb5a0daa2192 using fold by test (Thu Jan 01 00:00:00 1970 +0000)
| diff -r 471f378eab4c -r eb5a0daa2192 changeset-description
| --- a/changeset-description
| +++ b/changeset-description
| @@ -1,1 +1,1 @@
| -A0
| +C0
|
| diff -r 471f378eab4c -r eb5a0daa2192 B0
| --- /dev/null Thu Jan 01 00:00:00 1970 +0000
| +++ b/B0 Thu Jan 01 00:00:00 1970 +0000
| @@ -0,0 +1,1 @@
| +B0
|
|
x b7ea6d14e664 (3) B1
| folded(description, parent, content) as eb5a0daa2192 using fold by test (Thu Jan 01 00:00:00 1970 +0000)
| (No patch available, changesets rebased)
|
x 0dec01379d3b (2) B0
reworded(description) as b7ea6d14e664 using amend by test (Thu Jan 01 00:00:00 1970 +0000)
diff -r 0dec01379d3b -r b7ea6d14e664 changeset-description
--- a/changeset-description
+++ b/changeset-description
@@ -1,1 +1,1 @@
-B0
+B1
$ hg obslog eb5a0daa2192 --no-graph -Tjson | python -m json.tool
[
{
"markers": [],
"node": "eb5a0daa21923bbf8caeb2c42085b9e463861fd0",
"shortdescription": "C0"
},
{
"markers": [
{
"dates": [
[
*, (glob)
0
]
],
"effects": [
*, (glob)
*, (glob)
"content"
],
"operations": [
"fold"
],
"succnodes": [
"eb5a0daa21923bbf8caeb2c42085b9e463861fd0"
],
"users": [
"test"
],
"verb": "folded"
}
],
"node": "b7ea6d14e664bdc8922221f7992631b50da3fb07",
"shortdescription": "B1"
},
{
"markers": [
{
"dates": [
[
*, (glob)
0
]
],
"effects": [
"description"
],
"operations": [
"amend"
],
"succnodes": [
"b7ea6d14e664bdc8922221f7992631b50da3fb07"
],
"users": [
"test"
],
"verb": "reworded"
}
],
"node": "0dec01379d3be6318c470ead31b1fe7ae7cb53d5",
"shortdescription": "B0"
},
{
"markers": [
{
"dates": [
[
*, (glob)
0
]
],
"effects": [
"description",
"content"
],
"operations": [
"fold"
],
"succnodes": [
"eb5a0daa21923bbf8caeb2c42085b9e463861fd0"
],
"users": [
"test"
],
"verb": "folded"
}
],
"node": "471f378eab4c5e25f6c77f785b27c936efb22874",
"shortdescription": "A0"
}
]
$ hg update 471f378eab4c
abort: hidden revision '471f378eab4c' was rewritten as: eb5a0daa2192!
(use --hidden to access hidden revisions)
[255]
$ hg update --hidden 'desc(A0)'
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
updated to hidden changeset 471f378eab4c
(hidden revision '471f378eab4c' was rewritten as: eb5a0daa2192)
working directory parent is obsolete! (471f378eab4c)
(use 'hg evolve' to update to its successor: eb5a0daa2192)
$ hg update --hidden 0dec01379d3b
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
updated to hidden changeset 0dec01379d3b
(hidden revision '0dec01379d3b' was rewritten as: eb5a0daa2192)
working directory parent is obsolete! (0dec01379d3b)
(use 'hg evolve' to update to its successor: eb5a0daa2192)
$ hg update 0dec01379d3b
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg update --hidden 'desc(B0)'
0 files updated, 0 files merged, 0 files removed, 0 files unresolved