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git-filter-repo/t/t9390/degenerate

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filter-repo: add testcases dealing with topology changes Pruning of commits which become empty can result in a variety of topology changes: a merge may have lost all its ancestors corresponding to one of (or more) of its parents, a merge may end up merging a commit with itself, or a merge may end up merging a commit with its own ancestor. Merging a commit with itself makes no sense, so we'd rather prune down to one parent and hopefully prune the merge commit, but we do need to worry about whether the are changes in the commit and whether the original merge commit also merged something with itself. We have similar cases for dealing with a merge of some commit with its own ancestor: if the original topology did the same, or the merge commit has additional file changes, then we cannot remove the commit. But, otherwise, the commit can be pruned. Add testcases covering the variety of changes that can occur to make sure we get them right. Signed-off-by: Elijah Newren <newren@gmail.com>
2019-02-23 16:15:07 +00:00
feature done
# Simple repo with only three files, with a bunch of cases of dealing with
# topology changes possibly causing merge commits to need to be pruned.
#
# As with case1, the original-oid directives are very fake, but if an error
# is hit that shows one of these, it makes it really easy to know where it
# came from.
#
# Expressed with shorthand, log history in the format
# Commit Name(Parent(s)): files changed
# for this case looks like the following:
# W(V): moduleA/keepme
# V(U,U): moduleB/nukeme
# U(T): moduleA/sometimes
# T(S): moduleA/keepme
# S(R,R): moduleA/sometimes
# R(R): moduleB/nukeme
# Q(P): moduleA/keepme
# P(N,M): moduleA/sometimes
# O(M,N): moduleA/sometimes
# N(C): moduleB/nukeme
# M(L): moduleB/nukeme
# L(K): moduleA/keepme
# K(J): moduleB/nukeme
# J(D,H): moduleA/sometimes
# I(H,D): moduleA/sometimes # backwards-ish merge
# H(G): moduleB/nukeme
# G(F): moduleA/keepme
# F(D): moduleB/nukeme
# D(B,C): moduleA/sometimes
# C(A): moduleB/nukeme
# B(A): moduleB/nukeme
# A(): moduleA/keepme
#
# This involved case is intended to test the following:
# * Merge becoming non-merge due to both parents becoming same commit
# * Two sub-cases: it has changes of its own, or it doesn't
# * Merge becoming merge of commit with its own ancestor
# * Two cases: and it has changes, and it doesn't have changes
# * Two cases: first parent is the ancestor, second parent is the ancestor
# * Merge starting as merge of commit with its own ancestor
# * Two cases: has changes, doesn't have changes
# * Two cases: first parent, or second parent
blob
mark :1
original-oid 0000000000000000000000000000000000000001
data 10
keepme v1
blob
mark :2
original-oid 0000000000000000000000000000000000000002
data 10
nukeme v1
blob
mark :3
original-oid 0000000000000000000000000000000000000003
data 10
nukeme v2
blob
mark :4
original-oid 0000000000000000000000000000000000000004
data 13
sometimes v1
blob
mark :5
original-oid 0000000000000000000000000000000000000005
data 10
nukeme v3
blob
mark :6
original-oid 0000000000000000000000000000000000000006
data 10
keepme v2
blob
mark :7
original-oid 0000000000000000000000000000000000000007
data 10
nukem4 v4
blob
mark :8
original-oid 0000000000000000000000000000000000000008
data 13
sometimes v2
blob
mark :9
original-oid 0000000000000000000000000000000000000009
data 13
sometimes v3
blob
mark :10
original-oid 000000000000000000000000000000000000000A
data 10
nukeme v4
blob
mark :11
original-oid 000000000000000000000000000000000000000B
data 10
keepme v3
blob
mark :12
original-oid 000000000000000000000000000000000000000C
data 10
nukeme v5
blob
mark :13
original-oid 000000000000000000000000000000000000000D
data 10
nukeme v6
blob
mark :14
original-oid 000000000000000000000000000000000000000E
data 13
sometimes v4
blob
mark :15
original-oid 000000000000000000000000000000000000000F
data 13
sometimes v5
blob
mark :16
original-oid 0000000000000000000000000000000000000010
data 10
keepme v4
blob
mark :17
original-oid 0000000000000000000000000000000000000011
data 10
nukeme v7
blob
mark :18
original-oid 0000000000000000000000000000000000000012
data 13
sometimes v6
blob
mark :19
original-oid 0000000000000000000000000000000000000013
data 10
keepme v5
blob
mark :20
original-oid 0000000000000000000000000000000000000014
data 13
sometimes v7
blob
mark :21
original-oid 0000000000000000000000000000000000000015
data 10
nukeme v8
blob
mark :22
original-oid 0000000000000000000000000000000000000016
data 10
keepme v6
commit refs/heads/master
mark :26
original-oid 0000000000000000000000000000000000000020
author Full Name <user@organization.tld> 2000000000 +0100
committer Full Name <user@organization.tld> 2000000000 +0100
data 2
A
M 100644 :1 moduleA/keepme
commit refs/heads/master
mark :27
original-oid 0000000000000000000000000000000000000021
author Full Name <user@organization.tld> 2000010000 +0100
committer Full Name <user@organization.tld> 2000010000 +0100
data 2
B
from :26
M 100644 :2 moduleB/nukeme
commit refs/heads/master
mark :28
original-oid 0000000000000000000000000000000000000022
author Full Name <user@organization.tld> 2000020000 +0100
committer Full Name <user@organization.tld> 2000020000 +0100
data 2
C
from :26
M 100644 :3 moduleB/nukeme
commit refs/heads/master
mark :29
original-oid 0000000000000000000000000000000000000023
author Full Name <user@organization.tld> 2000030000 +0100
committer Full Name <user@organization.tld> 2000030000 +0100
data 29
D: Merge commit 'C' into 'B'
from :27
merge :28
M 100644 :4 moduleA/sometimes
commit refs/heads/master
mark :30
original-oid 0000000000000000000000000000000000000024
author Full Name <user@organization.tld> 2000040000 +0100
committer Full Name <user@organization.tld> 2000040000 +0100
data 2
F
from :29
M 100644 :5 moduleB/nukeme
commit refs/heads/master
mark :31
original-oid 0000000000000000000000000000000000000025
author Full Name <user@organization.tld> 2000050000 +0100
committer Full Name <user@organization.tld> 2000050000 +0100
data 2
G
from :30
M 100644 :6 moduleA/keepme
commit refs/heads/master
mark :32
original-oid 0000000000000000000000000000000000000026
author Full Name <user@organization.tld> 2000060000 +0100
committer Full Name <user@organization.tld> 2000060000 +0100
data 2
H
from :31
M 100644 :7 moduleB/nukeme
commit refs/heads/branchI
mark :33
original-oid 0000000000000000000000000000000000000027
author Full Name <user@organization.tld> 2000070000 +0100
committer Full Name <user@organization.tld> 2000070000 +0100
data 29
I: Merge commit 'D' into 'H'
from :32
merge :29
M 100644 :8 moduleA/sometimes
commit refs/heads/master
mark :34
original-oid 0000000000000000000000000000000000000028
author Full Name <user@organization.tld> 2000080000 +0100
committer Full Name <user@organization.tld> 2000080000 +0100
data 29
J: Merge commit 'H' into 'D'
from :29
merge :32
M 100644 :9 moduleA/sometimes
commit refs/heads/master
mark :35
original-oid 0000000000000000000000000000000000000029
author Full Name <user@organization.tld> 2000090000 +0100
committer Full Name <user@organization.tld> 2000090000 +0100
data 2
K
from :34
M 100644 :10 moduleB/nukeme
commit refs/heads/master
mark :36
original-oid 000000000000000000000000000000000000002A
author Full Name <user@organization.tld> 2000092000 +0100
committer Full Name <user@organization.tld> 2000092000 +0100
data 2
L
from :35
M 100644 :11 moduleA/keepme
commit refs/heads/master
mark :37
original-oid 000000000000000000000000000000000000002B
author Full Name <user@organization.tld> 2000094000 +0100
committer Full Name <user@organization.tld> 2000094000 +0100
data 2
M
from :36
M 100644 :12 moduleB/nukeme
commit refs/heads/master
mark :38
original-oid 000000000000000000000000000000000000002C
author Full Name <user@organization.tld> 2000096000 +0100
committer Full Name <user@organization.tld> 2000096000 +0100
data 2
N
from :28
M 100644 :13 moduleB/nukeme
commit refs/heads/branchO
mark :39
original-oid 000000000000000000000000000000000000002D
author Full Name <user@organization.tld> 2000098000 +0100
committer Full Name <user@organization.tld> 2000098000 +0100
data 29
O: Merge commit 'N' into 'M'
from :37
merge :38
D moduleA/sometimes
commit refs/heads/master
mark :40
original-oid 000000000000000000000000000000000000002E
author Full Name <user@organization.tld> 2000099000 +0100
committer Full Name <user@organization.tld> 2000099000 +0100
data 29
P: Merge commit 'M' into 'N'
from :38
merge :37
M 100644 :15 moduleA/sometimes
commit refs/heads/master
mark :41
original-oid 0000000000000000000000000000000000000030
author Full Name <user@organization.tld> 3000000000 +0100
committer Full Name <user@organization.tld> 3000000000 +0100
data 2
Q
from :40
M 100644 :16 moduleA/keepme
commit refs/heads/master
mark :42
original-oid 0000000000000000000000000000000000000031
author Full Name <user@organization.tld> 3000010000 +0100
committer Full Name <user@organization.tld> 3000010000 +0100
data 2
R
from :41
M 100644 :17 moduleB/nukeme
commit refs/heads/master
mark :43
original-oid 0000000000000000000000000000000000000032
author Full Name <user@organization.tld> 3000020000 +0100
committer Full Name <user@organization.tld> 3000020000 +0100
data 29
S: Merge commit 'R' into 'R'
from :42
merge :42
M 100644 :18 moduleA/sometimes
commit refs/heads/master
mark :44
original-oid 0000000000000000000000000000000000000033
author Full Name <user@organization.tld> 3000030000 +0100
committer Full Name <user@organization.tld> 3000030000 +0100
data 2
T
from :43
M 100644 :19 moduleA/keepme
commit refs/heads/master
mark :45
original-oid 0000000000000000000000000000000000000034
author Full Name <user@organization.tld> 3000040000 +0100
committer Full Name <user@organization.tld> 3000040000 +0100
data 2
U
from :44
M 100644 :20 moduleA/sometimes
commit refs/heads/master
mark :46
original-oid 0000000000000000000000000000000000000035
author Full Name <user@organization.tld> 3000050000 +0100
committer Full Name <user@organization.tld> 3000050000 +0100
data 29
V: Merge commit 'U' into 'U'
from :45
merge :45
M 100644 :21 moduleB/nukeme
commit refs/heads/master
mark :47
original-oid 0000000000000000000000000000000000000036
author Full Name <user@organization.tld> 3000060000 +0100
committer Full Name <user@organization.tld> 3000060000 +0100
data 2
W
from :46
M 100644 :22 moduleA/keepme
done
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