Summary of Changes

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This pull request addresses a critical issue in the standalone installer where version comparisons were consistently failing due to a mismatch in how version strings were formatted. By normalizing the MISE_CURRENT_VERSION to remove its 'v' prefix, the installer can now correctly identify the current version, enabling proper utilization of embedded checksums and the current-release CDN tarball path. This ensures the installer behaves as expected for the current release without unintended fallbacks.

Highlights

• Version Normalization: Normalized the MISE_CURRENT_VERSION variable by stripping its leading 'v' prefix before performing comparisons within the standalone installer script.
• Installer Logic Fix: Corrected the logic in get_checksum() and install_mise() functions to ensure accurate version comparisons, preventing the installer from always falling back to non-current-version paths.
• Preserved Format: Maintained the existing format of the rendered install.sh script, ensuring only the internal comparison logic was adjusted without altering public-facing version literals.

Greptile Summary

This PR fixes a long-standing bug in the standalone installer where the current-version fast-path (embedded checksums and CDN tarball URL) was never reached because MISE_CURRENT_VERSION carries a v prefix (e.g. v2.10.1) while the installer strips that prefix from the working version variable, making the string comparison always fail.

Key changes:

• In get_checksum(): adds a local current_version variable that strips the leading v from MISE_CURRENT_VERSION before comparing against the already-stripped version parameter.
• In install_mise(): same normalisation — current_version is derived by stripping the v prefix from MISE_CURRENT_VERSION, so the version != current_version guard correctly identifies the current-release install path.
• The public install.sh literal format is intentionally preserved; only the internal comparison variables change.

The fix is minimal, correct, and well-scoped — the ${var#v} parameter expansion is a no-op when the prefix is already absent, so the change is safe regardless of whether MISE_CURRENT_VERSION is emitted with or without the prefix in the future.

Confidence Score: 5/5

• This PR is safe to merge — it is a targeted, low-risk bug fix with no functional regressions.
• The change is confined to two small, symmetric patches in a single shell script template. Both patches follow the same well-established POSIX parameter-expansion idiom (${var#v}) already used elsewhere in the script. The logic is easy to verify: the installer already strips the v from version, so stripping it from MISE_CURRENT_VERSION into current_version before comparison is the correct and minimal fix. No new edge cases are introduced.
• No files require special attention.

Important Files Changed

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["install_mise() called"] --> B["version = MISE_VERSION or MISE_CURRENT_VERSION\nstrip leading v"]
    A --> C["current_version = MISE_CURRENT_VERSION\nstrip leading v  ← NEW"]

    B --> D{"version == current_version\n(both v-stripped)?"}
    C --> D

    D -- "No (different version) OR\nMISE_INSTALL_FROM_GITHUB=1" --> E["tarball_url = GitHub releases URL\nhttps://github.com/.../mise-v{version}-..."]
    D -- "Yes (current version) AND\nMISE_TARBALL_URL set" --> F["tarball_url = MISE_TARBALL_URL"]
    D -- "Yes (current version) AND\nno override" --> G["tarball_url = CDN URL\nhttps://mise.jdx.dev/v{version}/..."]

    E --> H["download_file(tarball_url)"]
    F --> H
    G --> H

    H --> I["get_checksum(version, os, arch, ext)"]
    I --> J["current_version = MISE_CURRENT_VERSION\nstrip leading v  ← NEW"]
    J --> K{"version == current_version?"}
    K -- "Yes" --> L["Use embedded static checksums\n(MISE_CHECKSUM_* vars)"]
    K -- "No" --> M["Fetch SHASUMS256.txt from GitHub releases"]

    L --> N["Validate checksum → extract tarball"]
    M --> N

_{Last reviewed commit: "fix(installer): norm..."}

coverage-7 failure is unrelated to this PR — caused by Java EA version bump (26 → 27). Fix is tracked in #8634