using source-branch and source-tag not possible but no explanation in help why this is the case

Bug #1851240 reported by Oliver Grawert
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Snapcraft
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Undecided
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Bug Description

trying to build a kernel snap from a certain tag and branch results in the following error:

Sorry, an error occurred in Snapcraft:
Failed to pull source: cannot specify both 'source-branch' and 'source-tag' for a git source.
See `snapcraft help sources` for more information.

looking at "snapcraft help sources" does not explain that these two are mutually exlusive in any way:
...
  - source-branch: <branch-name>

    Snapcraft will checkout a specific branch from the source tree. This
    only works on multi-branch repositories from git and hg (mercurial).

...
  - source-tag: <tag>

    Snapcraft will checkout the specific tag from the source tree revision
    control system.
...

they should either not be mutually exclusive (why are they at all) or there should be a proper hint in the help that one disables support for the other

Revision history for this message
Ian Johnson (anonymouse67) wrote :

IMHO I think this is not a snapcraft bug, just a misunderstanding of how git + commits work. For a given repo at a given point in time, a branch points at a single, specific commit. So if you specify a commit and a branch, that only resolves unambiguously if you specify the same commit as what the branch is currently pointing to. I think they are mutually exclusive for snapcraft since if you specify both a branch and a commit, it's either redundant or ambiguous.

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