81e7067 · 8,815 commits · 4,899 files
Issued 2026-10-23
Reads strong: 4 of 5 rated dimensions are strong, 1 is adequate and none is significant.
104 checks ran across 6 assessable dimensions. Security & Reliability Posture is adequate. 6 findings, each with evidence. One dimension cannot be assessed without an acquirer.
This repository reads strong. Show it in your README: the badge links to a page where anyone can check the reading. If you embed it: link it to the report, remove it if the report is delisted, and do not present it as a certification or an endorsement.
[](https://borehole.dev/verify/7GKTY1MK87R2?via=badge)- 04.62 Releases are cut from another branch than the one surveyed
- states a policy on AI-generated contributions agents.md:1
- 2 findings from checks Borehole's calibration found wrong more often than right are no longer published.
- The file and line of 5 credential-shaped matches are withheld. File and line are shown to whoever GitHub says controls this repository, signed in, and to a buyer of this report.
| Dimension | Rating | ||
|---|---|---|---|
| 01 | Architecture & Codebase — including AI provenance | strong | |
| 02 | Engineering Process & SDLC Maturity | strong | |
| 03 | Organization & Key-Person Risk | strong | |
| 04 | Product & Engineering Maturity | strong | |
| 05 | Security & Reliability Posture | adequate | |
| 06 | Observability & Operations | not assessable | |
| 07 | Fit with the Acquirer | not assessable |
- 5% of non-merge commits carry any trailer at all
- low trailer coverage: the convention may not be in consistent use
- no widespread author/committer date divergence
Architecture & Codebase — including AI provenance
01 · strong · ratings ↑Firestore/Protos/cpp/google/firestore/v1/firestore.pb.h is 15,253 lines, 198× this codebase's median file
adequateThe median source file here is 77 lines. 43 files exceed 1,000 lines, the largest being 15,253. Size is not a defect on its own — some problems genuinely live in one place — but these are where merge conflicts, review fatigue and single-owner knowledge concentrate, and they are the first thing that slows an inheriting engineer down. Measured against its own codebase's median, it is larger than 91% of 382 surveyed projects' largest files.
A note that does not affect this rating: notes like it are common in well-run projects.
| line-count | Firestore/Protos/cpp/google/firestore/v1/firestore.pb.h:1 — 15,253 lines (198× median) |
| line-count | Firestore/Protos/cpp/google/firestore/v1/firestore.pb.cc:1 — 11,636 lines (151× median) |
| line-count | Firestore/Protos/cpp/google/firestore/v1/query.pb.h:1 — 5,948 lines (77× median) |
| line-count | Firestore/Protos/cpp/google/firestore/v1/query.pb.cc:1 — 4,683 lines (60× median) |
| line-count | Firestore/Protos/cpp/google/firestore/v1/write.pb.h:1 — 4,085 lines (53× median) |
Respond to this finding
Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.
An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.
A move from Objective-C to Swift began 114 months ago and is 58% done
adequate633 product files are in the new language and 467 are still in the old one, 114 months after the first new file appeared. The new language's share of the lines rose from 2% to 46%, and moved 6 percentage points in the last year. Two languages for one job doubles what an engineer has to know, and the unmoved half is usually what nobody wants to touch. Ask whether finishing it is planned, and what it costs.
A note that does not affect this rating: in Borehole's calibration, this check's notes were usually true but overstated.
| file counts | 467 old, 633 new |
Respond to this finding
Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.
An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.
Engineering Process & SDLC Maturity
02 · strong · ratings ↑No finding. 16 checks ran and none fired; the rejection log below says why each did not.
Organization & Key-Person Risk
03 · strong · ratings ↑No finding. 10 checks ran and none fired; the rejection log below says why each did not.
Product & Engineering Maturity
04 · strong · ratings ↑Effort is shifting from building to rewriting
adequateDeleted lines per line added rose from 0.46 to 0.76 between the first and second halves of this history. Rework is normal and often healthy, but a rising ratio means an increasing share of the team's time is spent replacing code that already exists rather than building what does not. Whether that is deliberate repayment or churn is a question for the team.
A note that does not affect this rating: in Borehole's calibration, this check's notes were usually true but overstated.
| deletions-per-insertion | first half 0.46, second half 0.76 (split 2022-01-21) |
Respond to this finding
Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.
An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.
Releases are cut from another branch than the one surveyed
adequateThe newest release, 13.1.1, is not on the branch this survey read; the newest release on it is 13.1.0. The shipped product may differ from what this report describes. Survey the release branch too.
A note that does not affect this rating: notes like it are common in well-run projects.
| dc6dfd442 | tag 13.1.1 |
Respond to this finding
Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.
An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.
Security & Reliability Posture
05 · adequate · ratings ↑7 credential-shaped strings in the tree sit in tests, examples, documentation or local development settings
adequateStrings shaped like credentials appear only where fakes are usual: test fixtures, examples, documentation, placeholders and local stacks. They are almost always fakes. Ask someone to confirm that none of them works anywhere, because a real key in a development file is still a real key.
| Google API key | 5 cited: Google API key, where fakes are usual |
| File and line are shown to whoever GitHub says controls this repository, signed in, and to a buyer of this report. |
Respond to this finding
Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.
An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.
4 vendored components with no licence
adequateThird-party code is committed into this repository without any statement of the terms it arrived under. Unknown terms are harder to deal with than inconvenient ones: an awkward licence can be complied with, an absent one cannot. Each of these needs its origin established before the code changes hands.
A note that does not affect this rating: in Borehole's calibration, this check's notes were usually true but overstated.
| cmake/external/abseil-cpp.patch.txt | cmake/external/abseil-cpp.patch.txt — 1 tracked files, no licence file |
| cmake/external/leveldb-1.22_windows_paths.patch | cmake/external/leveldb-1.22_windows_paths.patch — 1 tracked files, no licence file |
| cmake/external/leveldb-1.23_windows_paths.patch | cmake/external/leveldb-1.23_windows_paths.patch — 1 tracked files, no licence file |
| cmake/external/snappy.patch | cmake/external/snappy.patch — 1 tracked files, no licence file |
Respond to this finding
Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.
An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.
Observability & Operations
06 · not assessable · ratings ↑Not rated: only 4 of 16 checks could reach a conclusion here; the rest do not apply to this repository or could not read it. What a person adds here.
Fit with the Acquirer
07 · not assessable · ratings ↑Not rated: structurally not assessable from a repository. What a person adds here.
Check it on the running system
2 checks against the running system follow from the findings above: what a buyer's engineer will try, how to run it first, and what to have ready. A paid survey of this repository includes them.
A paid survey of a public repository is also reviewed: a language model reads each finding against the code and withdraws only findings it judges the code contradicts, each listed with its reason. The review is a language model's reading of the findings against the code, and it can be wrong. It never adds a finding, never raises a band, and never removes a finding from a proven check or an advisory that affects the surveyed version.
What a person adds
The survey reads what the repository can show. The code cannot settle these questions, and on them this report states nothing. Each says where its answer lives: your own engineer, the company, or an assessor you choose can settle it. Questions marked measured open with something this repository shows.
Architecture & Codebase — including AI provenance
01 · full coverage- measured No architecture or design document is in the tree, across 2,767 product files. Where does the design live, and who holds it?
- Is the architecture right for the next three years of the product?
- Were the home-grown components reasonable choices when they were made, and are they now?
Engineering Process & SDLC Maturity
02 · high coverage- Is review real or a rubber stamp? Comment depth and time to approve need the pull request history.
- Is delivery planned and measured, or heroic?
- How are incidents run, reviewed and learned from?
Organization & Key-Person Risk
03 · partial coverage- measured 291 people have committed here. Which of them are you acquiring, and which are you replacing?
- Who mentors whom, and would that survive a departure?
- Can the team grow, and who stands behind the top three contributors?
- Is the seniority mix sound, and will pay survive your salary bands?
- Is the pace sustainable? Commit times cannot say: git keeps no reliable local time.
- Does the team want to stay after close?
- How are decisions made and disagreements resolved?
Product & Engineering Maturity
04 · minimal coverage- measured A roadmap file is in the tree (ROADMAP.md, last changed February 2024). A file is not a plan. Does it match the roadmap in the data room, and has the team delivered the last one it wrote?
- Does leadership know about the debt, and is time budgeted to repay it?
- Is the engineering shape consistent with the commercial story?
Security & Reliability Posture
05 · partial coverage- measured Infrastructure code (Firestore/firestore_collection_group_index_config.tf and 2 more) last changed 31 months before the newest commit, while 2,053 commits landed. Is the infrastructure now changed by hand? Compare the live account with the code.
- What has actually broken, how often, and how badly?
- What did external testing find, and was it fixed?
- What is the SOC 2, ISO 27001 or GDPR status, and where is the evidence?
Observability & Operations
06 · partial coverageNot rated: only 4 of 16 checks could reach a conclusion here; the rest do not apply to this repository or could not read it.
- Are the dashboards opened, the alerts acknowledged and the pages answered?
- Are the service-level objectives actually met?
- Who carries the pager, and how often does it go off?
- What does it cost to run, and how much headroom is there?
Fit with the Acquirer
07 · none coverageNot rated: structurally not assessable from a repository.
- This is primarily a C codebase, with Swift alongside (27% of source files). Does your engineering organisation already run C in production, or would this be the first?
- The bulk of this system sits in Firestore/, FirebaseDatabase/, FirebasePerformance/. Which of your existing systems would each of those have to absorb or replace?
- Nothing in the repository says how this is deployed. Is it shipped as a library, a binary or a service, and if it runs somewhere, who owns that environment?
- What is your tolerance for the findings above remaining unaddressed for the first two quarters after close, given everything else that will compete for this team's time?
- Which of these systems duplicate yours, and which get retired?
- What will integration cost, and in what order?
- Where does the team land in your organisation, and who reports to whom?
- Are there earn-outs, retention packages or contractor IP to assign?
- Do customer contracts limit hosting, regions or vendors?
A human assessment is Borehole's own paid service, €12,000+ (total price is determined per engagement; travel billed at cost). It is not independent of this report: the same business produced both. It is a separate contract, with its own scope, terms and reliance.
Embed the badge
Tied to this commit and this date, and it fades after 90 days — an honest badge is one that expires. A repository with significant findings gets a neutral "read" badge rather than a red one: the library is where the range is visible, not someone else's README.
[](/r/firebase/firebase-ios-sdk/81e7067)If you embed it: link it to the report, remove it if the report is delisted, and do not present it as a certification or an endorsement.
Rejection log — 98 signals that ran and did not fire
Appendix: rejection log — 98 signals that ran and did not fire
Published on purpose. A signal that looked and decided not to fire has told you something, and this is the calibration data behind every threshold above.
Looked, and found nothing — 68
| Signal | What it found |
|---|---|
| 04.hotspot_concentration | change is spread across the codebase rather than pooling in a few filesfiles 16,484 · top5 share 0.026 |
| 04.debt_markers | debt markers are sparsemarkers 597 · per kloc 0.74 · lines read 812,131 |
| 04.dependency_sprawl | direct dependency counts are unremarkable |
| 04.test_growth | test effort kept pace with code writtenlate test per code 0.417 · early test per code 0.448 |
| 04.eol_runtime | every pinned runtime is still supportedeol as of 2026-09-24 |
| 04.fixes_with_tests | fixes usually come with a testfixes 346 · share 0.405 · with tests 140 |
| 04.fix_share_trend | fixing is not crowding out building |
| 04.compat_layers | little code is kept for the old wayshare 0.0 · code files 2,450 · compat files 0 |
| 06.telemetry_presence | this repository does not deploy a running service, so instrumentation is not expected of itbasis nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere · files read 4,283 |
| 06.healthcheck_presence | not a running service, so a health endpoint is not expectedbasis nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere |
| 06.usage_reporting_default | the product's code names no reporting hostsettings on 0 · settings off 0 |
| 06.migrate_on_start | migrations do not run at container start |
| 03.contributor_concentration | no single contributor dominates the last 24 monthsyears 9.5 · window last 24 months · authors 291 |
| 03.active_contributors | more than one contributor active in the trailing yearall time 291 · active 12mo 51 |
| 03.drive_by_contributors | an open contributor base, where one-commit contributors are normalauthors 291 · one off share 0.512 |
| 03.contributor_attrition | no contributor dominates enough for their absence to matterauthors 291 · top share less than a quarter · top contributor last committed within the last three months |
| 03.critical_path_ownership | more than one person changes the critical pathsauthors 74 |
| 03.second_contributor_attrition | the second and third contributors are still active |
| 03.bus_factor_trend | the team has not narrowed to one person |
| 03.joiners_and_leavers | the team is not shrinkingleft 3 · joined 12 · regular last year 27 |
| 02.merge_discipline | a meaningful share of recent change carries evidence of reviewmerges 1 · window last 24 months · with tracked 2 |
| 02.ci_presence | CI configuration is present in the working treecount 56 |
| 02.test_presence | tests are present in a normal proportion to sourcetests 1,191 · source 3,594 · test ratio 0.331 |
| 02.release_cadence | tags are presenttags 1,150 |
| 02.conventional_commits | commit subjects generally carry contentsampled 8,580 · low content share 0.003 |
| 02.branch_protection_hints | process scaffolding is present in the repository |
| 02.ci_runs_tests | CI invokes a test runnerconfigs 55 · with tests 13 |
| 02.skipped_tests | few tests are switched offfocused 0 · skipped 0 · test files 1,577 |
| 02.ci_test_gating | no test run in CI is written so that it cannot failconfigs 56 |
| 02.revert_share | change is rarely undoneshare 0.004 · reverts 5 · recent commits 1,381 |
| 02.dependency_update_cadence | dependencies move with the codelockfiles 3 · commits since 172 · days since lockfile changed 65 |
| 02.flaky_test_markers | tests are not retried until they passtest retries 0 · suite retries 0 |
| 02.lint_in_build | a linter or formatter runs in the buildwired 3 · ci configs 56 · product files 2,450 |
| 02.commit_size | changes arrive in reviewable sizesshare 0.018 · commits 1,181 · over 2000 lines 21 |
| 01.burst_import | no commit run met both the rate and the net-addition thresholdgap seconds 180 · min add ratio 3.0 · min net added 2,000 |
| 01.initial_dump | first commit is not a disproportionate share of the codebaseinsertions 1 · share of insertions 0.0 |
| 01.message_uniformity | commit subjects vary in wording and lengthlength stdev 17.7 · repeat share 0.006 |
| 01.revision_depth | most files were revisited after they were first writtenfiles seen 2,480 · write once share 0.275 |
| 01.duplicated_blocks | little shipping code is repeated verbatim across filesshare 0.0079 · product files 2,402 · distinct blocks 199,996 |
| 01.swallowed_errors | errors are rarely thrown awayloc 816,312 · files 0 · per kloc 0.0 |
| 01.weights_in_git | no model weights are committedfiles 0 |
| 05.security_guardrails | at least one standard guard rail is configured |
| 05.dependency_pinning | a lockfile is committed, so builds are reproduciblelockfile True |
| 05.license_present | a licence file is presentfound True |
| 05.secrets_management_pattern | no environment file is committed outside tests and examplesenv files 0 |
| 05.supply_chain_pinning | third-party build steps are pinned, or fewaction refs 182 · pipe to shell 0 · unpinned third party 0 |
| 05.shell_from_strings | product code does not build shell commands from stringssites 0 |
| 05.unsafe_deserialization | no code-executing deserialiser in product codesites 0 |
| 05.known_vulnerabilities | no locked dependency has a published advisory; not assessed for CocoaPods, Swift Package Manageradvisories 0 · dependencies 65 · high or critical 0 |
| 05.privileged_workloads | no workload runs privileged or in the host's namespacessites 0 · behind a setting or built here 0 |
| 05.credentials_in_deploy_config | deployment configuration references secrets, never holds themfiles 0 · sites 0 |
| 05.signing_material | no signing keystore or profile is committedfiles 0 |
| 05.cleartext_traffic | plain HTTP is not allowed app-widesites 0 |
| 05.license_copyleft_inherited | every licence found in vendored code is permissive or weak-copyleftvendored paths 82 |
| 05.license_grant_unclear | the licence is recognisable as Apache-2.0class permissive · license Apache-2.0 |
| 05.committed_native_libraries | no widely used compiled library is committed to the productlibraries 0 |
| 04.deprecations_lingering | few deprecations have outlived two yearsolder than two years 0 · files with deprecations 6 |
| 04.dependency_churn | few dependencies were added and dropped within 60 daysdependencies seen 22 · added in two years 10 · removed within 60 days 0 |
| 04.ci_platforms_dropped | no platform was dropped from CI in the last two years |
| 04.repository_status | the README's first screen states no end, move or freezestatements 0 |
| 02.development_elsewhere | nothing says development happens elsewhereno pr statements 0 · mirror statements 0 · replayed commit share 0.0 |
| 05.licence_changes | the root licence has not changed in the history readlicence versions 1 · unreleased changes 0 |
| 05.paid_edition | no directory carries a separate paid-edition licencedirectories 0 |
| 04.releases_stopped | releases keep pace with developmentmedian gap days 0.0 · days since last tag 0 · commits last 90 days 213 |
| 03.single_maintainer | no file says one person maintains itstatements 0 |
| 05.project_advisories | no published advisory affects the surveyed versionaffecting 0 · exploited 0 · advisories 0 |
| 05.advisory_record | no advisory against the project in the last 24 monthscritical 0 · affecting 0 · could not tell 0 |
| 05.project_exploited | no affecting advisory is on CISA's Known Exploited listexploited 0 |
Could not conclude, or did not apply — 30
Not a clean result. Each says why it could not answer here.
| Signal | Why |
|---|---|
| 04.schema_churn | no schema migrations to read |
| 04.dependency_redundancy | no JavaScript manifest to read |
| 06.structured_logging | not assessed for C or Swift, the languages the product is written in: this check's patterns read other languages only |
| 06.telemetry_depth | not expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere |
| 06.print_logging | not expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere |
| 06.correlation_ids | not expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere |
| 06.error_reporting | not expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere |
| 06.alert_rules | not expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere |
| 06.deployed_image_floats | not expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere |
| 06.probes_identical | no Kubernetes probes |
| 06.single_replica | no Kubernetes deployments |
| 06.environment_branching | not expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere |
| 06.release_markers | not expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere |
| 06.feature_flags | no feature-flag service; flags may live elsewhere |
| 02.long_lived_branches | too few merges to judge (squash and rebase leave none) |
| 01.build_reproducibility | no product Dockerfile to read |
| 01.notebook_outputs | not a data or machine-learning repository |
| 05.container_runs_as_root | no Dockerfile outside development, test and example paths |
| 05.outbound_timeouts | not a running service |
| 05.migration_reversibility | too few migrations to judge |
| 05.sql_from_strings | not a running service; a library that builds SQL is doing its job |
| 05.tls_verification_off | not assessed for C or Swift, the languages the product is written in: this check's patterns read other languages only |
| 05.resource_limits | no Kubernetes workload manifests |
| 05.public_env_secret | not a frontend |
| 05.unsafe_html | not a frontend |
| 05.source_maps_shipped | not a frontend |
| 05.dataset_provenance | not a data or machine-learning repository |
| 05.license_manifest_conflict | no packaging manifest states a licence |
| 04.flags_accumulating | few or no feature flags in the history |
| 04.api_versions_coexisting | not a running service |
Anyone can check this report against the authoritative record — click the stamp, or enter 7GKT-Y1MK-87R2 at borehole.dev/verify.
The code commits to the 106 checks this run performed, the bands they produced, and the commit they were read at. It does not cover checks written since.
Put the mark in your README
The image is wrapped in a link to the verification page, so a reader can check it rather than take it on trust. If you embed it: link it to the report, remove it if the report is delisted, and do not present it as a certification or an endorsement.
[](https://borehole.dev/verify/7GKTY1MK87R2?via=badge)
Where this scan ran
This scan ran on ordinary cloud infrastructure (cloud-run), not in a hardware-isolated confidential VM. Nothing about it is attested by Google.
What an attested survey proves, and what it does not.
What this scan did with the repository — 7 steps
Written by the steps themselves as they ran, not described afterwards. A hand-written account of a data flow drifts the first time somebody changes the flow and not the account.
| At | Step | Detail |
|---|---|---|
| 0.0s | read repository metadata from the GitHub API | size mb: 83.4authenticated: False |
| 14.0s | cloned the repository to a temporary directory | depth: full |
| 28.9s | read the git history | commits: 8815tracked files: 4899 |
| 124.0s | ran the deterministic checks | blame pass: Falseread working tree: False |
| 124.0s | recorded where this scan ran | attested: Falseenvironment: cloud-run |
| 210.7s | kept the facts, never the source, for re-reading under new checks | |
| 210.7s | deleting the working copy |
Total 210.7s ·source content sent off this machine: none · calls to a language model: 0 · the clone was deleted when the survey ended
An automated reading of a repository's code and its history up to one commit, with public advisory records. It may be wrong, it is not legal, financial, investment or security advice, and it does not replace diligence by a qualified person. It is provided for information: nobody may rely on it (Borehole's terms, section 3).