Carryforward Flags are Best Used for Monorepos and Iterative Testing Setups
Carryforward Flags are designed for those projects that do not upload total coverage for every commit (e.g., monorepos with multiple applications/languages, iterative/partial/delta testing setups, etc).
To benefit from Carryforward Flags, make sure you are set up with Codecov's Flag feature, to tag different sessions/builds.
Basic Flags documentation, including:
- Set Flags in your YAML
-Fparameter in your upload
A straightforward example repository using carryforward flags can be seen here:
Before discussing how to use carryforward flags, it's important to discuss how they work. That is best demonstrated with the following diagram:
The following codecov.yml is also supplied for the above example:
flags: ui: paths: - ui_1.py - ui_2.py carryforward: true unit: paths: - unit_1.py - unit_2.py carryforward: true enterprise: paths: - ent_1.py - ent_2.py carryforward: false # If no Carryfoward flag specified in YAML, the # default configuration is false.
In this example, the coverage for
ui_2.py was taken directly from the coverage report uploaded for Commit 1. The
ui_cov.xml coverage report was uploaded using the following syntax:
bash <(curl https://codecov.io/bash) -f ui_cov.xml -F ui
This upload command specifies both the path to the coverage file for files under the ui flag and the appropriate flag name (ui in this case). Once uploaded, coverage was calculated to the ui_1.py and ui_2.py files in the same manner as any report upload.
Since no report is uploaded for the
unit flag, which has a setting of
carryforward: true , Codecov reaches back to Commit 0 to carry forward the coverage for all files covered by the
unit flag. As a result, those files have coverage information for Commit 1 that is equivalent to Commit 0.
Finally, since the
enterprise flag has a setting of
carryforward: false no coverage is carried forward for any file covered by the
enterprise flag. Since no coverage report was uploaded for the
enterprise flag for Commit 1, the
ent_2.py files have 0% coverage for Commit 1.
You Must Upload using -F
To properly leverage flags, and thus, carryforward flags, you must ensure you're uploading coverage reports with the appropriate flag name.
Once your team starts using carryforward flags they will appear in the UI just like normal flags, with the addition of distinctive iconography to set them apart from Codecov's standard flags. For example, carryforward flags can be toggled when viewing source:
Additionally, any coverage that is carried forward will be shown in the Build tab of a the commit that carried the coverage forward. The commit from which the coverage was carried forward is also referenced wherever carryforward flags are shown, like so:
Carryforward Flags do not show in the pull request comment by default
By default, any flags that are carried forward will not show up in the pull request / merge request in your code host (Github, Gitlab, or Bitbucket) in the status checks and/or the pull request comments.
Instead, only flags that have coverage uploaded on the most recent commit will show in the PR Comments.
By default flags that are carried forward will not appear in the Pull Request Comment.
If you would like Carryforward Flags to appear in PR comments, use the following YAML configuration under
The possible settings for:
false[default]: flags with carried forward coverage will not show up on the flags table
true: if any flag coverage was carried forward, the flags table will have an additional column labeled “Carriedforward” indicating which flags had coverage carried forward
comment: layout: "reach, diff, flags, files” behavior: default require_changes: false # if true: only post the comment if coverage changes require_base: no # [yes :: must have a base report to post] require_head: yes # [yes :: must have a head report to post] branches: # branch names that can post comment - "master" show_carryforward_flags: false
Updated about a month ago