core: update mount type for krunkit VM to virtiofs when 9p is specified

[Kit09K]

Description

Currently, starting Colima with --vm-type krunkit fails immediately if --mount-type is not explicitly set, because the configuration defaults to 9p. The krunkit driver only supports virtiofs or reverse-sshfs, resulting in the following fatal error:

rpc error: code = Unknown desc = field mountType must be virtiofs or reverse-sshfs for krunkit driver, got 9p

Changes

This PR adds the missing fallback logic in cmd/start.go (inside setFlagDefaults). It automatically updates the mountType to virtiofs when krunkit is used and 9p is currently specified.

This mirrors the existing behavior that is already implemented for the vz vmType, allowing users to start a krunkit VM smoothly without manually overriding the mount type.

[abiosoft]

Can you kindly sign your commits? You can check here for details.

[abiosoft]

DCO signing required

[Kit09K]

Hi @abiosoft, Thank you for reviewing my PR. I have already amended my commit to include the Signed-off-by line and force-pushed it, but I noticed the DCO requirement is still flagged. Could you kindly clarify if the DCO strict policy requires me to use my real full name (First Name + Last Name) instead of my GitHub username ( Kit09K)? If so, I am more than happy to update my git config with my real name, amend the commit, and push it again. Thank you for your guidance! ในวันที่ ศุกร์ 24 ก.ค. 2026 เวลา 20:36 Abiola Ibrahim < ***@***.***> เขียนว่า:

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***@***.**** requested changes on this pull request. DCO signing required — Reply to this email directly, view it on GitHub <#1609?email_source=notifications&email_token=A6PRHL35TIJNPTERGLCREOT5GNQ5TA5CNFSNUABKM5UWIORPF5TWS5BNNB2WEL2QOVWGYUTFOF2WK43UKJSXM2LFO4XTINZXGM3DKNBVG44KM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KYZTPN52GK4S7MNWGSY3L#pullrequestreview-4773654578>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/A6PRHL5QERHO3HKR2PARD435GNQ5TAVCNFSNUABFKJSXA33TNF2G64TZHM2DAMZQGIYDKMZRHNEXG43VMU5TIOJWGYYDQNZVGIZ2C5QC> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[abiosoft]

The DCO is fine now :)

[Kit09K]

Thank you so much for your help and for approving this PR! :) Since I am currently an intern and still learning, I just wanted to ask for a little bit of feedback. Does the code work as expected on your end, and is the implementation approach correct? Any feedback or advice you could give me would be highly appreciated to help me improve my coding skills. Thank you again for your time! ในวันที่ ศุกร์ 24 ก.ค. 2026 เวลา 20:47 Abiola Ibrahim < ***@***.***> เขียนว่า:

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*abiosoft* left a comment (abiosoft/colima#1609) <#1609 (comment)> The DCO is fine now :) — Reply to this email directly, view it on GitHub <#1609?email_source=notifications&email_token=A6PRHL2WX22UJPDEHH53LQT5GNSFPA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKMBXGA2TKMBQGA32M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KYZTPN52GK4S7MNWGSY3L#issuecomment-5070550007>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/A6PRHL4PSLPMLWYZOF7F6FT5GNSFPAVCNFSNUABFKJSXA33TNF2G64TZHM2DAMZQGIYDKMZRHNEXG43VMU5TIOJWGYYDQNZVGIZ2C5QC> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[abiosoft]

The code looks straightforward and correct :)

Thanks.