${ghprbActualCommit} does not pick up current commit from hook if an additional branch is specified.

[NathanZookCH]

Jenkins and plugins versions report

Environment

Jenkins: 2.332.2
OS: Linux - 5.11.0-1022-aws
---
ace-editor:1.1
antisamy-markup-formatter:2.7
apache-httpcomponents-client-4-api:4.5.13-1.0
bootstrap4-api:4.6.0-3
bootstrap5-api:5.1.3-6
bouncycastle-api:2.25
branch-api:2.1044.v2c007e51b_87f
caffeine-api:2.9.2-29.v717aac953ff3
checks-api:1.7.2
cloudbees-folder:6.714.v79e858ef76a_2
command-launcher:1.6
credentials:1087.1089.v2f1b_9a_b_040e4
credentials-binding:1.27.1
display-url-api:2.3.6
durable-task:495.v29cd95ec10f2
echarts-api:5.3.0-2
email-ext:2.87
external-monitor-job:191.v363d0d1efdf8
font-awesome-api:6.0.0-1
ghprb:1.42.2
git:4.11.0
git-client:3.11.0
git-server:1.10
github:1.34.3
github-api:1.301-378.v9807bd746da5
handlebars:3.0.8
jackson2-api:2.13.2-260.v43d711474c77
javax-activation-api:1.2.0-2
javax-mail-api:1.6.2-5
jaxb:2.3.0.1
jdk-tool:1.5
jnr-posix-api:3.1.7-3
jquery-detached:1.2.1
jquery3-api:3.6.0-2
jsch:0.1.55.2
junit:1.58
ldap:2.8
mailer:408.vd726a_1130320
matrix-auth:3.1
matrix-project:758.v7a_ea_491852f3
momentjs:1.1.1
okhttp-api:4.9.3-105.vb96869f8ac3a
pam-auth:1.7
pipeline-graph-analysis:188.v3a01e7973f2c
pipeline-input-step:447.v95e5a_6e3502a_
pipeline-stage-step:291.vf0a8a7aeeb50
plain-credentials:1.8
plugin-util-api:2.16.0
popper-api:1.16.1-2
popper2-api:2.11.5-1
rake:1.8.0
resource-disposer:0.18
scm-api:595.vd5a_df5eb_0e39
script-security:1145.vb_cf6cf6ed960
snakeyaml-api:1.29.1
ssh-agent:1.24.1
ssh-credentials:1.19
ssh-slaves:1.806.v2253cedd3295
sshd:3.228.v4c9f9e652c86
structs:308.v852b473a2b8c
timestamper:1.17
token-macro:285.vff7645a_56ff0
trilead-api:1.57.v6e90e07157e1
windows-slaves:1.8
workflow-api:1143.v2d42f1e9dea_5
workflow-cps:2686.v7c37e0578401
workflow-durable-task-step:1128.v8c259d125340
workflow-job:1174.vdcb_d054cf74a_
workflow-scm-step:2.13
workflow-step-api:622.vb_8e7c15b_c95a_
workflow-support:817.v58126df57338
ws-cleanup:0.41

What Operating System are you using (both controller, and any agents involved in the problem)?

Ubuntu 20.04 on AWS

Java 11 on controller and worker nodes.

Reproduction steps

1. Set up job with two branches specified, one using ${ghprbActualCommit}, the other specifying refs/heads/master.
2. Create pull request.
3. Observe that the code actually checked out & used for the test is not from the pull request.

Expected Results

The code checked out & used for the test should be from the pull request.

Actual Results

The code checked out & used for the test is from a different commit (presumably master).

Anything else?

No response

[Sti2nd]

I think I am also experiencing this. Although I have only one "Branch specifier" in Jenkins I have refspec of origin and PRs. Using ${ghprbActualCommit} does not work, Jenkins check out an old commit. Using {sha1} works, but then we are building the merge commit.

Something interesting: After one have built with {sha1} and then try to change back to ${ghprbActualCommit} the old commit it chooses are the commit that were used for the merge in {sha1}.

I think it is related or the same bug as this #683

[Sti2nd]

Update: I began using the Pipeline: Multibranch plugin instead