feat(internal/tool/gem): verify input directories and tools before installation - #6778
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This pull request introduces validation for the installation and binary directories in the gem tool package, ensuring they are absolute paths. It extracts validation logic into a new verify helper function and adds comprehensive unit tests to cover the new validation behavior. I have no feedback to provide as there are no review comments.
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🤖 I have created a release *beep* *boop* --- ## [0.26.0](v0.25.0...v0.26.0) (2026-07-13) ### Features * **internal/gem:** add gem package to install Ruby gem tools ([#6724](#6724)) ([40ba6df](40ba6df)) * **internal/librarian/java:** add ApplyMoveActionsToLibrary helper and unit tests ([#6731](#6731)) ([f25bd33](f25bd33)) * **internal/librarian/java:** add RestructureToLibrary helper and unit tests ([#6757](#6757)) ([b2ff68c](b2ff68c)), closes [#6516](#6516) * **internal/librarian/java:** add ToKeepSet helper and unit tests ([#6730](#6730)) ([df99304](df99304)), closes [#6516](#6516) * **internal/librarian/java:** integrate native Go postprocessor into Java generator ([#6768](#6768)) ([074059d](074059d)), closes [#6516](#6516) * **internal/librarian/java:** mark legacy postprocessing for deprecation ([#6716](#6716)) ([78a4ab6](78a4ab6)), closes [#6516](#6516) * **internal/librarian/nodejs:** use cache and bin directories for nodejs install ([#6680](#6680)) ([7f88869](7f88869)) * **internal/librarian/php:** add inital PHP client library generator ([#6703](#6703)) ([9a45ab1](9a45ab1)) * **internal/librarian/php:** add tool installation directory helpers ([#6717](#6717)) ([9cdf0b5](9cdf0b5)), closes [#6630](#6630) * **internal/librarian/ruby:** support installing Ruby gem dependencies ([#6751](#6751)) ([bbce2c4](bbce2c4)), closes [#6634](#6634) * **internal/librarian:** add ruby tools directory to env output ([#6781](#6781)) ([c220d71](c220d71)) * **internal/postprocessing:** add Apply pipeline runner and tests ([#6714](#6714)) ([5cb8f66](5cb8f66)), closes [#6516](#6516) * **internal/postprocessing:** add ApplyMethodOperations batch runner and tests ([#6698](#6698)) ([8377d53](8377d53)), closes [#6516](#6516) * **internal/postprocessing:** add applyToFiles and RemoveFiles ([#6673](#6673)) ([2f4b437](2f4b437)), closes [#6516](#6516) * **internal/postprocessing:** add CopyFiles batch runner and tests ([#6686](#6686)) ([20c3a1a](20c3a1a)) * **internal/postprocessing:** add ReplaceAll and ReplaceRegexAll batch runners and tests ([#6688](#6688)) ([bb18f06](bb18f06)) * **internal/protoc:** add protoc installation and use installed `protoc` in Java generation ([#6622](#6622)) ([00ee24d](00ee24d)) * **internal/protoc:** add Run function ([#6699](#6699)) ([cd8a1d4](cd8a1d4)), closes [#6558](#6558) * **internal/serviceconfig:** allowlist API paths for php ([#6789](#6789)) ([7907686](7907686)), closes [#6629](#6629) * **internal/tool/gem:** verify input directories and tools before installation ([#6778](#6778)) ([3086d63](3086d63)) * **java:** append versions.txt on add ([#6653](#6653)) ([9e9e645](9e9e645)) * **librarian/internal/config:** add php config ([#6701](#6701)) ([939ae6f](939ae6f)) * **migrate:** discover and list PHP libraries during migration ([#6728](#6728)) ([e552b89](e552b89)) * **sidekick/parser:** correct LRO poller service ([#6704](#6704)) ([1d4b2d1](1d4b2d1)) * **sidekick/rust:** remove unstable gate for LRO tracing ([#6459](#6459)) ([8266ce3](8266ce3)) * **sidekick/swift:** discovery LROs ([#6738](#6738)) ([c294d15](c294d15)) * **sidekick/swift:** generate deprecation attributes ([#6750](#6750)) ([145e8ae](145e8ae)) * **sidekick/swift:** traits with dependencies ([#6709](#6709)) ([e8389f2](e8389f2)) * **swift:** add protobuf generation support ([#6697](#6697)) ([3bebf26](3bebf26)) * **tool/cmd/migrate/php:** scaffold composer tools for php ([#6736](#6736)) ([f23b451](f23b451)) * **tool/cmd/migrate:** add support to php ([#6726](#6726)) ([586bac0](586bac0)), closes [#6723](#6723) * **tool/cmd/migrate:** support union versions in PHP OwlBot configs ([#6782](#6782)) ([7690206](7690206)), closes [#6779](#6779) ### Bug Fixes * **internal/librarian/java:** remove excluded_poms from repometadata ([#6676](#6676)) ([5e0f7f2](5e0f7f2)) * **internal/librarian/php:** enforce explicit API paths and add default output path ([#6740](#6740)) ([347bbd6](347bbd6)) * **internal/librarian:** preserve gem tools during tidy ([#6783](#6783)) ([0150007](0150007)) * **internal/librarian:** preserve maven and protoc configuration during tidy ([#6702](#6702)) ([b439528](b439528)), closes [#6558](#6558) * **internal/snippetmetadata:** disable HTML escaping in JSON output ([#6777](#6777)) ([4da5e28](4da5e28)), closes [#6776](#6776) * **librarian/rust:** detect inconsistent repos ([#6766](#6766)) ([82ce5a9](82ce5a9)) * **sidekick/swift:** missing enum value docs ([#6727](#6727)) ([e9020d2](e9020d2)) * **tool/cmd/migrate:** populate API paths from .OwlBot.yaml during migrate for php ([#6739](#6739)) ([6a15260](6a15260)) --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please). Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
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A verify function is added to internal/tool/gem to validate target installation paths and gem tool specifications before running the gem installation command.
Fixes #6762