feat: add internal reproducible git checksum builtin (#203)

Adds a new rego builtin `attest.internals.reproducible_git_checksum`.
This is needed for verifying DOI provenance, see
https://github.com/docker/doi-image-policy/blob/main/slsa.md#doi-build-reproducible-git-checksum.

We use https://github.com/go-git/go-git for as much of this as possible,
but it doesn't support the actual archive operation, so we shell out to
`git` for that.

There is some similar unexported code in bashbrew, and we should
probably be using the same code in the build process as we are here.
I'll create a follow-up ticket to sort that out.

go.mod

@@ -10,6 +10,7 @@ require (
 	github.com/containerd/platforms v0.2.1
 	github.com/distribution/reference v0.6.0
 	github.com/docker-library/bashbrew v0.1.12
+	github.com/go-git/go-git/v5 v5.5.1
 	github.com/go-openapi/runtime v0.28.0
 	github.com/go-openapi/strfmt v0.23.0
 	github.com/google/go-containerregistry v0.20.2
@@ -40,9 +41,11 @@ require (
 	cloud.google.com/go/iam v1.2.1 // indirect
 	cloud.google.com/go/kms v1.20.0 // indirect
 	cloud.google.com/go/longrunning v0.6.1 // indirect
+	github.com/Microsoft/go-winio v0.6.2 // indirect
 	github.com/Microsoft/hcsshim v0.12.6 // indirect
 	github.com/OneOfOne/xxhash v1.2.8 // indirect
 	github.com/ProtonMail/go-crypto v1.0.0 // indirect
+	github.com/acomagu/bufpipe v1.0.3 // indirect
 	github.com/agnivade/levenshtein v1.2.0 // indirect
 	github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 // indirect
 	github.com/aws/aws-sdk-go-v2 v1.32.2 // indirect
@@ -76,9 +79,12 @@ require (
 	github.com/docker/distribution v2.8.3+incompatible // indirect
 	github.com/docker/docker-credential-helpers v0.8.1 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/emirpasic/gods v1.18.1 // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/fsnotify/fsnotify v1.7.0 // indirect
 	github.com/go-chi/chi v4.1.2+incompatible // indirect
+	github.com/go-git/gcfg v1.5.0 // indirect
+	github.com/go-git/go-billy/v5 v5.3.1 // indirect
 	github.com/go-ini/ini v1.67.0 // indirect
 	github.com/go-jose/go-jose/v4 v4.0.4 // indirect
 	github.com/go-logr/logr v1.4.2 // indirect
@@ -103,11 +109,14 @@ require (
 	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
 	github.com/hashicorp/go-retryablehttp v0.7.7 // indirect
 	github.com/hashicorp/hcl v1.0.1-vault-5 // indirect
+	github.com/imdario/mergo v0.3.16 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 // indirect
 	github.com/jedisct1/go-minisign v0.0.0-20230811132847-661be99b8267 // indirect
 	github.com/jellydator/ttlcache/v3 v3.3.0 // indirect
 	github.com/jmespath/go-jmespath v0.4.0 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
+	github.com/kevinburke/ssh_config v1.2.0 // indirect
 	github.com/klauspost/compress v1.17.10 // indirect
 	github.com/letsencrypt/boulder v0.0.0-20240620165639-de9c06129bec // indirect
 	github.com/magiconair/properties v1.8.7 // indirect
@@ -120,6 +129,7 @@ require (
 	github.com/opencontainers/go-digest v1.0.0 // indirect
 	github.com/opentracing/opentracing-go v1.2.0 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.3 // indirect
+	github.com/pjbgf/sha1cd v0.2.3 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/prometheus/client_golang v1.20.4 // indirect
@@ -130,10 +140,12 @@ require (
 	github.com/sagikazarmark/locafero v0.4.0 // indirect
 	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
 	github.com/sassoftware/relic v7.2.1+incompatible // indirect
+	github.com/sergi/go-diff v1.3.1 // indirect
 	github.com/shibumi/go-pathspec v1.3.0 // indirect
 	github.com/sigstore/protobuf-specs v0.3.2 // indirect
 	github.com/sigstore/timestamp-authority v1.2.2 // indirect
 	github.com/sirupsen/logrus v1.9.3 // indirect
+	github.com/skeema/knownhosts v1.1.0 // indirect
 	github.com/sourcegraph/conc v0.3.0 // indirect
 	github.com/spf13/afero v1.11.0 // indirect
 	github.com/spf13/cast v1.6.0 // indirect
@@ -147,6 +159,7 @@ require (
 	github.com/titanous/rocacheck v0.0.0-20171023193734-afe73141d399 // indirect
 	github.com/transparency-dev/merkle v0.0.2 // indirect
 	github.com/vbatts/tar-split v0.11.5 // indirect
+	github.com/xanzy/ssh-agent v0.3.3 // indirect
 	github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb // indirect
 	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
 	github.com/yashtewari/glob-intersection v0.2.0 // indirect
@@ -176,6 +189,7 @@ require (
 	google.golang.org/grpc v1.67.1 // indirect
 	google.golang.org/protobuf v1.35.1 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
+	gopkg.in/warnings.v0 v0.1.2 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	gotest.tools/v3 v3.5.1 // indirect

go.sum

@@ -57,16 +57,20 @@ github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03
 github.com/DataDog/zstd v1.4.8/go.mod h1:g4AWEaM3yOg3HYfnJ3YIawPnVdXJh9QME85blwSAmyw=
 github.com/Masterminds/semver/v3 v3.3.0 h1:B8LGeaivUe71a5qox1ICM/JLl0NqZSW5CHyL+hmvYS0=
 github.com/Masterminds/semver/v3 v3.3.0/go.mod h1:4V+yj/TJE1HU9XfppCwVMZq3I84lprf4nC11bSS5beM=
+github.com/Microsoft/go-winio v0.5.2/go.mod h1:WpS1mjBmmwHBEWmogvA2mj8546UReBk4v8QkMxJ6pZY=
 github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
 github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
 github.com/Microsoft/hcsshim v0.12.6 h1:qEnZjoHXv+4/s0LmKZWE0/AiZmMWEIkFfWBSf1a0wlU=
 github.com/Microsoft/hcsshim v0.12.6/go.mod h1:ZABCLVcvLMjIkzr9rUGcQ1QA0p0P3Ps+d3N1g2DsFfk=
 github.com/OneOfOne/xxhash v1.2.8 h1:31czK/TI9sNkxIKfaUfGlU47BAxQ0ztGgd9vPyqimf8=
 github.com/OneOfOne/xxhash v1.2.8/go.mod h1:eZbhyaAYD41SGSSsnmcpxVoRiQ/MPUTjUdIIOT9Um7Q=
+github.com/ProtonMail/go-crypto v0.0.0-20221026131551-cf6655e29de4/go.mod h1:UBYPn8k0D56RtnR8RFQMjmh4KrZzWJ5o7Z9SYjossQ8=
 github.com/ProtonMail/go-crypto v1.0.0 h1:LRuvITjQWX+WIfr930YHG2HNfjR1uOfyf5vE0kC2U78=
 github.com/ProtonMail/go-crypto v1.0.0/go.mod h1:EjAoLdwvbIOoOQr3ihjnSoLZRtE8azugULFRteWMNc0=
 github.com/ThalesIgnite/crypto11 v1.2.5 h1:1IiIIEqYmBvUYFeMnHqRft4bwf/O36jryEUpY+9ef8E=
 github.com/ThalesIgnite/crypto11 v1.2.5/go.mod h1:ILDKtnCKiQ7zRoNxcp36Y1ZR8LBPmR2E23+wTQe/MlE=
+github.com/acomagu/bufpipe v1.0.3 h1:fxAGrHZTgQ9w5QqVItgzwj235/uYZYgbXitB+dLupOk=
+github.com/acomagu/bufpipe v1.0.3/go.mod h1:mxdxdup/WdsKVreO5GpW4+M/1CE2sMG4jeGJ2sYmHc4=
 github.com/agnivade/levenshtein v1.2.0 h1:U9L4IOT0Y3i0TIlUIDJ7rVUziKi/zPbrJGaFrtYH3SY=
 github.com/agnivade/levenshtein v1.2.0/go.mod h1:QVVI16kDrtSuwcpd0p1+xMC6Z/VfhtCyDIjcwga4/DU=
 github.com/alessio/shellescape v1.4.1 h1:V7yhSDDn8LP4lc4jS8pFkt0zCnzVJlG5JXy9BVKJUX0=
@@ -93,8 +97,12 @@ github.com/alibabacloud-go/tea-xml v1.1.3 h1:7LYnm+JbOq2B+T/B0fHC4Ies4/FofC4zHzY
 github.com/alibabacloud-go/tea-xml v1.1.3/go.mod h1:Rq08vgCcCAjHyRi/M7xlHKUykZCEtyBy9+DPF6GgEu8=
 github.com/aliyun/credentials-go v1.3.2 h1:L4WppI9rctC8PdlMgyTkF8bBsy9pyKQEzBD1bHMRl+g=
 github.com/aliyun/credentials-go v1.3.2/go.mod h1:tlpz4uys4Rn7Ik4/piGRrTbXy2uLKvePgQJJduE+Y5c=
+github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be h1:9AeTilPcZAjCFIImctFaOjnTIavg87rW78vTPkQqLI8=
+github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be/go.mod h1:ySMOLuWl6zY27l47sB3qLNK6tF2fkHG55UZxx8oIVo4=
 github.com/arbovm/levenshtein v0.0.0-20160628152529-48b4e1c0c4d0 h1:jfIu9sQUG6Ig+0+Ap1h4unLjW6YQJpKZVmUzxsD4E/Q=
 github.com/arbovm/levenshtein v0.0.0-20160628152529-48b4e1c0c4d0/go.mod h1:t2tdKJDJF9BV14lnkjHmOQgcvEKgtqs5a1N3LNdJhGE=
+github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPdPJAN/hZIm0C4OItdklCFmMRWYpio=
+github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs=
 github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 h1:DklsrG3dyBCFEj5IhUbnKptjxatkF07cF2ak3yi77so=
 github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2/go.mod h1:WaHUgvxTVq04UNunO+XhnAqY/wQc+bxr74GqbsZ/Jqw=
 github.com/aws/aws-sdk-go v1.55.5 h1:KKUZBfBoyqy5d3swXyiC7Q76ic40rYcbqH7qjh59kzU=
@@ -145,6 +153,7 @@ github.com/buildkite/interpolate v0.1.3 h1:OFEhqji1rNTRg0u9DsSodg63sjJQEb1uWbENq
 github.com/buildkite/interpolate v0.1.3/go.mod h1:UNVe6A+UfiBNKbhAySrBbZFZFxQ+DXr9nWen6WVt/A8=
 github.com/buildkite/roko v1.2.0 h1:hbNURz//dQqNl6Eo9awjQOVOZwSDJ8VEbBDxSfT9rGQ=
 github.com/buildkite/roko v1.2.0/go.mod h1:23R9e6nHxgedznkwwfmqZ6+0VJZJZ2Sg/uVcp2cP46I=
+github.com/bwesterb/go-ristretto v1.2.0/go.mod h1:fUIoIZaG73pV5biE2Blr2xEzDoMj7NFEuV9ekS419A0=
 github.com/bwesterb/go-ristretto v1.2.3/go.mod h1:fUIoIZaG73pV5biE2Blr2xEzDoMj7NFEuV9ekS419A0=
 github.com/bytecodealliance/wasmtime-go/v3 v3.0.2 h1:3uZCA/BLTIu+DqCfguByNMJa2HVHpXvjfy0Dy7g6fuA=
 github.com/bytecodealliance/wasmtime-go/v3 v3.0.2/go.mod h1:RnUjnIXxEJcL6BgCvNyzCCRzZcxCgsZCi+RNlvYor5Q=
@@ -165,6 +174,7 @@ github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMn
 github.com/clbanning/mxj/v2 v2.7.0 h1:WA/La7UGCanFe5NpHF0Q3DNtnCsVoxbPKuyBNHWRyME=
 github.com/clbanning/mxj/v2 v2.7.0/go.mod h1:hNiWqW14h+kc+MdF9C6/YoRfjEJoR3ou6tn/Qo+ve2s=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cloudflare/circl v1.1.0/go.mod h1:prBCrKB9DV4poKZY1l9zBXg2QJY7mvgRvtMxxK7fi4I=
 github.com/cloudflare/circl v1.3.3/go.mod h1:5XYMA4rFBvNIrhs50XuiBJ15vF2pZn4nnUKZrLbUZFA=
 github.com/cloudflare/circl v1.3.8 h1:j+V8jJt09PoeMFIu2uh5JUyEaIHTXVOHslFoLNAKqwI=
 github.com/cloudflare/circl v1.3.8/go.mod h1:PDRU+oXvdD7KCtgKxW95M5Z8BpSCJXQORiZFnBQS5QU=
@@ -190,6 +200,7 @@ github.com/containerd/stargz-snapshotter/estargz v0.15.1/go.mod h1:gr2RNwukQ/S9N
 github.com/coreos/go-oidc/v3 v3.11.0 h1:Ia3MxdwpSw702YW0xgfmP1GVCMA9aEFWu12XUZ3/OtI=
 github.com/coreos/go-oidc/v3 v3.11.0/go.mod h1:gE3LgjOgFoHi9a4ce4/tJczr0Ai2/BoDhf0r5lltWI0=
 github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/cyberphone/json-canonicalization v0.0.0-20231217050601-ba74d44ecf5f h1:eHnXnuK47UlSTOQexbzxAZfekVz6i+LKRdj1CU5DPaM=
 github.com/cyberphone/json-canonicalization v0.0.0-20231217050601-ba74d44ecf5f/go.mod h1:uzvlm1mxhHkdfqitSA92i7Se+S9ksOn3a3qmv/kyOCw=
 github.com/danieljoos/wincred v1.2.1 h1:dl9cBrupW8+r5250DYkYxocLeZ1Y4vB1kxgtjxw8GQs=
@@ -229,6 +240,8 @@ github.com/emicklei/go-restful/v3 v3.11.0 h1:rAQeMHw1c7zTmncogyy8VvRZwtkmkZ4FxER
 github.com/emicklei/go-restful/v3 v3.11.0/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc=
 github.com/emicklei/proto v1.12.1 h1:6n/Z2pZAnBwuhU66Gs8160B8rrrYKo7h2F2sCOnNceE=
 github.com/emicklei/proto v1.12.1/go.mod h1:rn1FgRS/FANiZdD2djyH7TMA9jdRDcYQ9IEN9yvjX0A=
+github.com/emirpasic/gods v1.18.1 h1:FXtiHYKDGKCW2KzwZKx0iC0PQmdlorYgdFG9jPXJ1Bc=
+github.com/emirpasic/gods v1.18.1/go.mod h1:8tpGGwCnJ5H4r6BWwaV6OrWmMoPhUl5jm/FMNAnJvWQ=
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
@@ -250,8 +263,18 @@ github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nos
 github.com/fsnotify/fsnotify v1.7.0/go.mod h1:40Bi/Hjc2AVfZrqy+aj+yEI+/bRxZnMJyTJwOpGvigM=
 github.com/fxamacker/cbor/v2 v2.7.0 h1:iM5WgngdRBanHcxugY4JySA0nk1wZorNOpTgCMedv5E=
 github.com/fxamacker/cbor/v2 v2.7.0/go.mod h1:pxXPTn3joSm21Gbwsv0w9OSA2y1HFR9qXEeXQVeNoDQ=
+github.com/gliderlabs/ssh v0.3.5 h1:OcaySEmAQJgyYcArR+gGGTHCyE7nvhEMTlYY+Dp8CpY=
+github.com/gliderlabs/ssh v0.3.5/go.mod h1:8XB4KraRrX39qHhT6yxPsHedjA08I/uBVwj4xC+/+z4=
 github.com/go-chi/chi v4.1.2+incompatible h1:fGFk2Gmi/YKXk0OmGfBh0WgmN3XB8lVnEyNz34tQRec=
 github.com/go-chi/chi v4.1.2+incompatible/go.mod h1:eB3wogJHnLi3x/kFX2A+IbTBlXxmMeXJVKy9tTv1XzQ=
+github.com/go-git/gcfg v1.5.0 h1:Q5ViNfGF8zFgyJWPqYwA7qGFoMTEiBmdlkcfRmpIMa4=
+github.com/go-git/gcfg v1.5.0/go.mod h1:5m20vg6GwYabIxaOonVkTdrILxQMpEShl1xiMF4ua+E=
+github.com/go-git/go-billy/v5 v5.3.1 h1:CPiOUAzKtMRvolEKw+bG1PLRpT7D3LIs3/3ey4Aiu34=
+github.com/go-git/go-billy/v5 v5.3.1/go.mod h1:pmpqyWchKfYfrkb/UVH4otLvyi/5gJlGI4Hb3ZqZ3W0=
+github.com/go-git/go-git-fixtures/v4 v4.3.1 h1:y5z6dd3qi8Hl+stezc8p3JxDkoTRqMAlKnXHuzrfjTQ=
+github.com/go-git/go-git-fixtures/v4 v4.3.1/go.mod h1:8LHG1a3SRW71ettAD/jW13h8c6AqjVSeL11RAdgaqpo=
+github.com/go-git/go-git/v5 v5.5.1 h1:5vtv2TB5PM/gPM+EvsHJ16hJh4uAkdGcKilcwY7FYwo=
+github.com/go-git/go-git/v5 v5.5.1/go.mod h1:uz5PQ3d0gz7mSgzZhSJToM6ALPaKCdSnl58/Xb5hzr8=
 github.com/go-ini/ini v1.67.0 h1:z6ZrTEZqSWOTyH2FlglNbNgARyHG8oLW9gMELqKr06A=
 github.com/go-ini/ini v1.67.0/go.mod h1:ByCAeIL28uOIIG0E3PJtZPDL8WnHpFKFOtgjp+3Ies8=
 github.com/go-jose/go-jose/v3 v3.0.3 h1:fFKWeig/irsp7XD2zBxvnmA/XaRWp5V3CBsZXJF7G7k=
@@ -388,6 +411,7 @@ github.com/howeyc/gopass v0.0.0-20210920133722-c8aef6fb66ef h1:A9HsByNhogrvm9cWb
 github.com/howeyc/gopass v0.0.0-20210920133722-c8aef6fb66ef/go.mod h1:lADxMC39cJJqL93Duh1xhAs4I2Zs8mKS89XWXFGp9cs=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/ianlancetaylor/demangle v0.0.0-20200824232613-28f6c0f3b639/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
+github.com/imdario/mergo v0.3.13/go.mod h1:4lJ1jqUDcsbIECGy0RUJAXNIhg+6ocWgb1ALK2O4oXg=
 github.com/imdario/mergo v0.3.16 h1:wwQJbIsHYGMUyLSPrEq1CT16AhnhNJQ51+4fdHUnCl4=
 github.com/imdario/mergo v0.3.16/go.mod h1:WBLT9ZmE3lPoWsEzCh9LPo3TiwVN+ZKEjmz+hD27ysY=
 github.com/in-toto/attestation v1.1.0 h1:oRWzfmZPDSctChD0VaQV7MJrywKOzyNrtpENQFq//2Q=
@@ -396,10 +420,13 @@ github.com/in-toto/in-toto-golang v0.9.0 h1:tHny7ac4KgtsfrG6ybU8gVOZux2H8jN05AXJ
 github.com/in-toto/in-toto-golang v0.9.0/go.mod h1:xsBVrVsHNsB61++S6Dy2vWosKhuA3lUTQd+eF9HdeMo=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
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@@ -410,11 +437,17 @@ github.com/josharian/intern v1.0.0 h1:vlS4z54oSdjm0bgjRigI+G1HpF+tI+9rE5LLzOg8Hm
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@@ -425,6 +458,8 @@ github.com/magiconair/properties v1.8.7 h1:IeQXZAiQcpL9mgcAe1Nu6cX9LLw6ExEHKjN0V
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@@ -447,6 +482,7 @@ github.com/mozillazg/docker-credential-acr-helper v0.4.0 h1:Uoh3Z9CcpEDnLiozDx+D
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@@ -482,6 +518,8 @@ github.com/pborman/uuid v1.2.1 h1:+ZZIw58t/ozdjRaXh/3awHfmWRbzYxJoAdNJxe/3pvw=
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@@ -519,6 +557,9 @@ github.com/secure-systems-lab/go-securesystemslib v0.8.0 h1:mr5An6X45Kb2nddcFlbm
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@@ -543,8 +584,11 @@ github.com/sigstore/sigstore/pkg/signature/kms/hashivault v1.8.8 h1:Zte3Oogkd8m+
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@@ -564,7 +608,9 @@ github.com/spiffe/go-spiffe/v2 v2.3.0/go.mod h1:Oxsaio7DBgSNqhAO9i/9tLClaVlfRok7
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@@ -597,6 +643,8 @@ github.com/x448/float16 v0.8.4 h1:qLwI1I70+NjRFUR3zs1JPUCgaCXSh3SW62uAKT1mSBM=
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@@ -645,6 +693,10 @@ golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8U
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@@ -672,9 +724,11 @@ golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwY
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@@ -697,19 +751,26 @@ golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5h
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 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210112080510-489259a85091/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210320140829-1e4c9ba3b0c4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20211007075335-d3039528d8ac/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220412211240-33da011f77ad/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220825204002-c680a09ffe64/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.3.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
@@ -718,6 +779,7 @@ golang.org/x/sys v0.26.0 h1:KHjCJyddX0LoSTb3J+vWpupP9p0oznkqVk/IfjymZbo=
 golang.org/x/sys v0.26.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
+golang.org/x/term v0.0.0-20220722155259-a9ba230a4035/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/term v0.2.0/go.mod h1:TVmDHMZPmdnySmBfhjOoOdhjzdE1h4u1VwSiw2l1Nuc=
 golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
 golang.org/x/term v0.6.0/go.mod h1:m6U89DPEgQRMq3DNkDClhWw02AUbt2daBVO4cn4Hv9U=
@@ -784,6 +846,8 @@ google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQ
 google.golang.org/protobuf v1.35.1 h1:m3LfL6/Ca+fqnjnlqQXNpFPABW1UD7mjh8KO2mKFytA=
 google.golang.org/protobuf v1.35.1/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
@@ -793,6 +857,8 @@ gopkg.in/ini.v1 v1.67.0 h1:Dgnx+6+nfE+IfzjUEISNeydPJh9AXNNsWbGP9KzCsOA=
 gopkg.in/ini.v1 v1.67.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/warnings.v0 v0.1.2 h1:wFXVbFY8DY5/xOe1ECiWdKCzZlxgshcYVNkBHstARME=
+gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
@@ -800,6 +866,7 @@ gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gotest.tools/v3 v3.5.1 h1:EENdUnS3pdur5nybKYIh2Vfgc8IUNBjxDPSjtiJcOzU=

internal/git/git.go

@@ -0,0 +1,176 @@
+/*
+   Copyright Docker attest authors
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package git
+
+import (
+	"archive/tar"
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"os/exec"
+
+	"github.com/go-git/go-git/v5"
+	"github.com/go-git/go-git/v5/config"
+	"github.com/go-git/go-git/v5/plumbing"
+)
+
+// GitCommand is the path to the git binary, overridden in tests to check behavior when git is not installed.
+var GitCommand = "git"
+
+func Clone(ctx context.Context, gitRepo string, gitCommit string, targetDir string) error {
+	const localBranch = "FETCH_HEAD"
+
+	repo, err := git.PlainInit(targetDir, false)
+	if err != nil {
+		return fmt.Errorf("failed to init: %w", err)
+	}
+
+	remote, err := repo.CreateRemote(&config.RemoteConfig{
+		Name: "origin",
+		URLs: []string{gitRepo},
+		Fetch: []config.RefSpec{
+			config.RefSpec(fmt.Sprintf("%s:%s", gitCommit, localBranch)),
+		},
+	})
+	if err != nil {
+		return fmt.Errorf("failed to add remote: %w", err)
+	}
+
+	err = remote.FetchContext(ctx, &git.FetchOptions{
+		Depth: 1,
+	})
+	if err != nil {
+		return fmt.Errorf("failed to fetch: %w", err)
+	}
+
+	wt, err := repo.Worktree()
+	if err != nil {
+		return fmt.Errorf("failed to get worktree: %w", err)
+	}
+	err = wt.Checkout(&git.CheckoutOptions{
+		Branch: plumbing.ReferenceName(localBranch),
+	})
+	if err != nil {
+		return fmt.Errorf("failed to checkout: %w", err)
+	}
+
+	return nil
+}
+
+type execError struct {
+	*exec.ExitError
+	stderr []byte
+}
+
+func (e *execError) Error() string {
+	trimmed := bytes.TrimSpace(e.stderr)
+	if len(trimmed) == 0 {
+		return e.ExitError.Error()
+	}
+	return fmt.Sprintf("%s, %q", e.ExitError.Error(), string(bytes.TrimSpace(e.stderr)))
+}
+
+func (e *execError) Unwrap() error {
+	return e.ExitError
+}
+
+// Archive creates a tar archive of the files in the subdirectory given by subdir of the git repository at gitRepoDir.
+// This is accomplished by running `git archive --format=tar HEAD:subdir` in the git repository directory.
+//
+// The archive is written to the returned io.Reader. It is not necessary to close the returned reader.
+// Any error encountered while starting the command will be returned immediately.
+// Any error encountered after the command is running will be returned on the next read from the returned io.Reader.
+func Archive(ctx context.Context, gitRepoDir string, subdir string) (io.Reader, error) {
+	readPipe, writePipe := io.Pipe()
+
+	treeish := fmt.Sprintf("HEAD:%s", subdir)
+	cmd := exec.CommandContext(ctx, GitCommand, "archive", "--format=tar", treeish)
+	// run the command inside the git repo directory
+	cmd.Dir = gitRepoDir
+
+	// set the standard output to the write end of the pipe
+	cmd.Stdout = writePipe
+
+	// capture standard error so we can include it in the error message if the command fails
+	stderr := new(bytes.Buffer)
+	cmd.Stderr = stderr
+
+	err := cmd.Start()
+	if err != nil {
+		return nil, fmt.Errorf("failed to start command: %w", err)
+	}
+
+	// spawn a goroutine to wait for the command to finish and close the write pipe
+	go func() {
+		var err error // variable to hold any error
+
+		defer func() {
+			if p := recover(); p != nil {
+				// if we panic, set err to a new error wrapping the panic value
+				err = fmt.Errorf("panic: %v", p)
+			}
+
+			// send any error from the command (or the panic above) to the write pipe
+			// or nil if there was no error
+			// this will cause the error to be returned on the next read from the read pipe
+			writePipe.CloseWithError(err)
+		}()
+
+		// wait for the command to finish and capture any error
+		err = cmd.Wait()
+		if err != nil {
+			if ee, ok := err.(*exec.ExitError); ok {
+				err = &execError{ExitError: ee, stderr: stderr.Bytes()}
+			}
+		}
+	}()
+
+	return readPipe, nil
+}
+
+func TarScrub(in io.Reader, out io.Writer) error {
+	tr := tar.NewReader(in)
+	tw := tar.NewWriter(out)
+	defer tw.Flush() // note: flush instead of close to avoid the empty block at EOF
+
+	for {
+		hdr, err := tr.Next()
+		if err == io.EOF {
+			return nil
+		}
+		if err != nil {
+			return err
+		}
+		newHdr := &tar.Header{
+			Typeflag: hdr.Typeflag,
+			Name:     hdr.Name,
+			Linkname: hdr.Linkname,
+			Size:     hdr.Size,
+			Mode:     hdr.Mode,
+			Devmajor: hdr.Devmajor,
+			Devminor: hdr.Devminor,
+		}
+		if err := tw.WriteHeader(newHdr); err != nil {
+			return err
+		}
+		_, err = io.CopyN(tw, tr, hdr.Size)
+		if err != nil {
+			return err
+		}
+	}
+}

internal/git/git_test.go

@@ -0,0 +1,42 @@
+/*
+   Copyright Docker attest authors
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package git
+
+import (
+	"context"
+	"os"
+	"os/exec"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestArchiveWithInvalidGitCommand(t *testing.T) {
+	originalGitCommand := GitCommand
+	GitCommand = "invalid-git-command"
+	defer func() { GitCommand = originalGitCommand }()
+
+	tempDir, err := os.MkdirTemp("", "gitrepo")
+	if err != nil {
+		t.Fatalf("failed to create temp dir: %v", err)
+	}
+	defer os.RemoveAll(tempDir)
+
+	ctx := context.Background()
+	_, err = Archive(ctx, tempDir, "")
+	require.ErrorIs(t, err, exec.ErrNotFound)
+}

policy/rego.go

@@ -19,13 +19,17 @@ package policy
 import (
 	"bytes"
 	"context"
+	"crypto/sha256"
+	"encoding/hex"
 	"encoding/json"
 	"fmt"
 	"os"
 	"path/filepath"
+	"time"
 
 	"github.com/docker-library/bashbrew/manifest"
 	"github.com/docker/attest/attestation"
+	"github.com/docker/attest/internal/git"
 	intoto "github.com/in-toto/in-toto-golang/in_toto"
 	"github.com/open-policy-agent/opa/ast"
 	"github.com/open-policy-agent/opa/rego"
@@ -153,24 +157,40 @@ func jsonGenerator[T any]() func(t *ast.Term, ec *rego.EvalContext) (any, error)
 	}
 }
 
-var dynamicObj = types.NewObject(nil, types.NewDynamicProperty(types.A, types.A))
+var (
+	dynamicObj    = types.NewObject(nil, types.NewDynamicProperty(types.A, types.A))
+	valueErrorObj = types.NewObject([]*types.StaticProperty{
+		types.NewStaticProperty("value", types.A),
+		types.NewStaticProperty("error", types.S),
+	}, nil)
+)
 
-var verifyDecl = &ast.Builtin{
+var verifyDecl = &rego.Function{
 	Name:             "attest.verify",
-	Decl:             types.NewFunction(types.Args(dynamicObj, dynamicObj), dynamicObj),
+	Decl:             types.NewFunction(types.Args(dynamicObj, dynamicObj), valueErrorObj),
 	Nondeterministic: true,
+	Memoize:          true,
 }
 
-var attestDecl = &ast.Builtin{
+var attestDecl = &rego.Function{
 	Name:             "attest.fetch",
-	Decl:             types.NewFunction(types.Args(types.S), dynamicObj),
+	Decl:             types.NewFunction(types.Args(types.S), valueErrorObj),
 	Nondeterministic: true,
+	Memoize:          true,
 }
 
-var internalParseLibraryDefinitionDecl = &ast.Builtin{
+var internalParseLibraryDefinitionDecl = &rego.Function{
 	Name:             "attest.internals.parse_library_definition",
-	Decl:             types.NewFunction(types.Args(types.S), dynamicObj),
+	Decl:             types.NewFunction(types.Args(types.S), valueErrorObj),
 	Nondeterministic: false,
+	Memoize:          true,
+}
+
+var internalReproducibleGitChecksumDecl = &rego.Function{
+	Name:             "attest.internals.reproducible_git_checksum",
+	Decl:             types.NewFunction(types.Args(types.S, types.S, types.S), valueErrorObj),
+	Nondeterministic: true,
+	Memoize:          true,
 }
 
 func wrapFunctionResult(value *ast.Term, err error) (*ast.Term, error) {
@@ -184,51 +204,60 @@ func wrapFunctionResult(value *ast.Term, err error) (*ast.Term, error) {
 	return ast.ObjectTerm(terms...), nil
 }
 
-func handleErrors1(f func(rCtx rego.BuiltinContext, a *ast.Term) (*ast.Term, error)) rego.Builtin1 {
+func handleErrors1(f rego.Builtin1) rego.Builtin1 {
 	return func(rCtx rego.BuiltinContext, a *ast.Term) (*ast.Term, error) {
 		return wrapFunctionResult(f(rCtx, a))
 	}
 }
 
-func handleErrors2(f func(rCtx rego.BuiltinContext, a, b *ast.Term) (*ast.Term, error)) rego.Builtin2 {
+func handleErrors2(f rego.Builtin2) rego.Builtin2 {
 	return func(rCtx rego.BuiltinContext, a, b *ast.Term) (*ast.Term, error) {
 		return wrapFunctionResult(f(rCtx, a, b))
 	}
 }
 
+func handleErrors3(f rego.Builtin3) rego.Builtin3 {
+	return func(rCtx rego.BuiltinContext, a, b, c *ast.Term) (*ast.Term, error) {
+		return wrapFunctionResult(f(rCtx, a, b, c))
+	}
+}
+
 func RegoFunctions(regoOpts *RegoFnOpts) []*tester.Builtin {
 	return []*tester.Builtin{
 		builtin2(verifyDecl, regoOpts.verifyInTotoEnvelope),
 		builtin1(attestDecl, regoOpts.fetchInTotoAttestations),
 		builtin1(internalParseLibraryDefinitionDecl, regoOpts.internalParseLibraryDefinition),
+		builtin3(internalReproducibleGitChecksumDecl, regoOpts.internalReproducibleGitChecksum),
 	}
 }
 
-func builtin1(decl *ast.Builtin, f rego.Builtin1) *tester.Builtin {
+func builtin1(decl *rego.Function, f rego.Builtin1) *tester.Builtin {
 	return &tester.Builtin{
-		Decl: decl,
-		Func: rego.Function1(
-			&rego.Function{
-				Name:             decl.Name,
-				Decl:             decl.Decl,
-				Memoize:          true,
-				Nondeterministic: decl.Nondeterministic,
-			},
-			handleErrors1(f)),
+		Decl: regoFuncToBuiltin(decl),
+		Func: rego.Function1(decl, handleErrors1(f)),
 	}
 }
 
-func builtin2(decl *ast.Builtin, f rego.Builtin2) *tester.Builtin {
+func builtin2(decl *rego.Function, f rego.Builtin2) *tester.Builtin {
 	return &tester.Builtin{
-		Decl: decl,
-		Func: rego.Function2(
-			&rego.Function{
-				Name:             decl.Name,
-				Decl:             decl.Decl,
-				Memoize:          true,
-				Nondeterministic: decl.Nondeterministic,
-			},
-			handleErrors2(f)),
+		Decl: regoFuncToBuiltin(decl),
+		Func: rego.Function2(decl, handleErrors2(f)),
+	}
+}
+
+func builtin3(decl *rego.Function, f rego.Builtin3) *tester.Builtin {
+	return &tester.Builtin{
+		Decl: regoFuncToBuiltin(decl),
+		Func: rego.Function3(decl, handleErrors3(f)),
+	}
+}
+
+func regoFuncToBuiltin(decl *rego.Function) *ast.Builtin {
+	return &ast.Builtin{
+		Name:             decl.Name,
+		Description:      decl.Description,
+		Decl:             decl.Decl,
+		Nondeterministic: decl.Nondeterministic,
 	}
 }
 
@@ -323,7 +352,7 @@ func (regoOpts *RegoFnOpts) verifyInTotoEnvelope(rCtx rego.BuiltinContext, envTe
 func (regoOpts *RegoFnOpts) internalParseLibraryDefinition(_ rego.BuiltinContext, definitionTerm *ast.Term) (*ast.Term, error) {
 	definitionStr, ok := definitionTerm.Value.(ast.String)
 	if !ok {
-		return nil, fmt.Errorf("predicateTypeTerm is not a string")
+		return nil, fmt.Errorf("definitionTerm is not a string")
 	}
 	definition := string(definitionStr)
 	defBuffer := bytes.NewBufferString(definition)
@@ -338,6 +367,66 @@ func (regoOpts *RegoFnOpts) internalParseLibraryDefinition(_ rego.BuiltinContext
 	return ast.NewTerm(value), nil
 }
 
+// because we don't control the signature here (blame rego)
+// nolint:gocritic
+func (regoOpts *RegoFnOpts) internalReproducibleGitChecksum(rCtx rego.BuiltinContext, gitRepoTerm, gitCommitTerm, gitDirectoryTerm *ast.Term) (*ast.Term, error) {
+	gitRepoStr, ok := gitRepoTerm.Value.(ast.String)
+	if !ok {
+		return nil, fmt.Errorf("gitRepoTerm is not a string")
+	}
+	gitCommitStr, ok := gitCommitTerm.Value.(ast.String)
+	if !ok {
+		return nil, fmt.Errorf("gitCommitTerm is not a string")
+	}
+	gitDirectoryStr, ok := gitDirectoryTerm.Value.(ast.String)
+	if !ok {
+		return nil, fmt.Errorf("gitDirectoryTerm is not a string")
+	}
+	gitRepo := string(gitRepoStr)
+	gitCommit := string(gitCommitStr)
+	gitDirectory := string(gitDirectoryStr)
+	checksum, err := reproducibleGitChecksum(rCtx.Context, gitRepo, gitCommit, gitDirectory)
+	if err != nil {
+		return nil, err
+	}
+	value, err := ast.InterfaceToValue(checksum)
+	if err != nil {
+		return nil, err
+	}
+	return ast.NewTerm(value), nil
+}
+
+func reproducibleGitChecksum(ctx context.Context, gitRepo, gitCommit, gitDirectory string) (string, error) {
+	repoDir, err := os.MkdirTemp("", "git-clone-")
+	if err != nil {
+		return "", fmt.Errorf("failed to create temporary directory: %w", err)
+	}
+	defer os.RemoveAll(repoDir)
+
+	err = git.Clone(ctx, gitRepo, gitCommit, repoDir)
+	if err != nil {
+		return "", fmt.Errorf("failed to clone git repository: %w", err)
+	}
+
+	// set a timeout to avoid the archive command hanging indefinitely
+	ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
+	defer cancel()
+
+	r, err := git.Archive(ctx, repoDir, gitDirectory)
+	if err != nil {
+		return "", fmt.Errorf("failed to get git archive: %w", err)
+	}
+
+	h := sha256.New()
+	err = git.TarScrub(r, h)
+	if err != nil {
+		return "", fmt.Errorf("failed to calculate hash of git archive: %w", err)
+	}
+
+	digest := h.Sum(nil)
+	return hex.EncodeToString(digest), nil
+}
+
 func loadYAML(path string, bs []byte) (interface{}, error) {
 	var x interface{}
 	bs, err := yaml.YAMLToJSON(bs)

policy/rego_test.go

@@ -75,6 +75,30 @@ func TestPolicyDefParse(t *testing.T) {
 	assert.Truef(t, results[0].Pass(), "expected result 1 to pass, got %v", results[0].Location)
 }
 
+func TestReproGitChecksum(t *testing.T) {
+	paths := []string{"testdata/policies/test/git_checksum"}
+	modules, store, err := tester.Load(paths, nil)
+	require.NoError(t, err)
+	resolver := &NullAttestationResolver{}
+
+	opts := NewRegoFunctionOptions(resolver, nil)
+	ctx := context.Background()
+	ch, err := tester.NewRunner().
+		SetStore(store).
+		AddCustomBuiltins(RegoFunctions(opts)).
+		CapturePrintOutput(true).
+		RaiseBuiltinErrors(true).
+		EnableTracing(true).
+		SetModules(modules).
+		RunTests(ctx, nil)
+	require.NoError(t, err)
+	require.NoError(t, err)
+	results := buffer(ch)
+	t.Log(string(results[0].Output))
+	assert.Equalf(t, 1, len(results), "expected 1 results, got %d", len(results))
+	assert.Truef(t, results[0].Pass(), "expected result 1 to pass, got failure at %v", results[0].Location)
+}
+
 func buffer[T any](ch chan T) []T {
 	var out []T
 	for v := range ch {

policy/testdata/policies/test/git_checksum/git_checksum_test.rego

@@ -0,0 +1,26 @@
+package git_checksum_test
+
+import rego.v1
+
+test_reproducible_git_checksum if {
+	# test case from https://github.com/docker-library/meta/blob/5c3af85f2c735ea2b689271cb64ff38bcca28bec/builds.json
+	#  build id: e1dc43214da28419a105a665f994080e83093c6849fe2851344350b8c264afd1
+	# grab with `curl https://raw.githubusercontent.com/docker-library/meta/5c3af85f2c735ea2b689271cb64ff38bcca28bec/builds.json | jq '."e1dc43214da28419a105a665f994080e83093c6849fe2851344350b8c264afd1"'`
+
+	repo := "https://github.com/docker-library/busybox.git"
+	commit := "91f9975d4bb91d7c916ef74de77911d961ac9b75"
+	dir := "latest/glibc/amd64"
+	expected_checksum := "48d47b7ee1617a53291a76942cd240773fbb59daaa874007c6d16cb3125d63c2"
+
+	result := attest.internals.reproducible_git_checksum(repo, commit, dir)
+	actual_checksum := result.value
+	actual_checksum == expected_checksum
+
+	invalid_commit := "0000000000000000000000000000000000000000"
+	bad_commit_result := attest.internals.reproducible_git_checksum(repo, invalid_commit, dir)
+	contains(bad_commit_result.error, "failed to fetch")
+
+	invalid_dir := "not_a_real_dir"
+	bad_dir_result := attest.internals.reproducible_git_checksum(repo, commit, invalid_dir)
+	contains(bad_dir_result.error, "not a valid object name")
+}