diff --git a/go.mod b/go.mod
index 169aab2..f8183a0 100644
--- a/go.mod
+++ b/go.mod
@@ -3,48 +3,46 @@
 go 1.17
 
 require (
+	cloud.google.com/go v0.97.0 // indirect
 	cloud.google.com/go/firestore v1.6.1
 	github.com/Microsoft/go-winio v0.4.16 // indirect
 	github.com/ProtonMail/go-crypto v0.0.0-20210428141323-04723f9f07d7 // indirect
 	github.com/acomagu/bufpipe v1.0.3 // indirect
+	github.com/census-instrumentation/opencensus-proto v0.2.1 // indirect
+	github.com/cespare/xxhash v1.1.0 // indirect
+	github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403 // indirect
+	github.com/cncf/xds/go v0.0.0-20210312221358-fbca930ec8ed // indirect
 	github.com/emirpasic/gods v1.12.0 // indirect
+	github.com/envoyproxy/go-control-plane v0.9.9-0.20210512163311-63b5d3c536b0 // indirect
+	github.com/envoyproxy/protoc-gen-validate v0.1.0 // indirect
 	github.com/go-git/gcfg v1.5.0 // indirect
 	github.com/go-git/go-billy/v5 v5.3.1
 	github.com/go-git/go-git/v5 v5.4.2
+	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
 	github.com/google/go-cmp v0.5.6
+	github.com/googleapis/gax-go/v2 v2.1.1 // indirect
 	github.com/imdario/mergo v0.3.12 // indirect
 	github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 // indirect
 	github.com/kevinburke/ssh_config v0.0.0-20201106050909-4977a11b4351 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/sergi/go-diff v1.1.0 // indirect
 	github.com/xanzy/ssh-agent v0.3.0 // indirect
-	golang.org/x/crypto v0.0.0-20210817164053-32db794688a5 // indirect
-	golang.org/x/mod v0.4.2
-	golang.org/x/net v0.0.0-20210503060351-7fd8e65b6420 // indirect
+	go.opencensus.io v0.23.0 // indirect
+	golang.org/x/crypto v0.0.0-20210921155107-089bfa567519 // indirect
+	golang.org/x/exp v0.0.0-20211123021643-48cbe7f80d7c
+	golang.org/x/mod v0.6.0-dev.0.20211013180041-c96bc1413d57
+	golang.org/x/net v0.0.0-20211015210444-4f30a5c0130f // indirect
+	golang.org/x/oauth2 v0.0.0-20211005180243-6b3c2da341f1 // indirect
 	golang.org/x/sys v0.0.0-20211025201205-69cdffdb9359 // indirect
-	golang.org/x/tools v0.1.5
+	golang.org/x/text v0.3.7 // indirect
+	golang.org/x/tools v0.1.8-0.20211029000441-d6a9af8af023
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 	google.golang.org/api v0.60.0
-	gopkg.in/warnings.v0 v0.1.2 // indirect
-	gopkg.in/yaml.v2 v2.4.0
-)
-
-require (
-	cloud.google.com/go v0.97.0 // indirect
-	github.com/census-instrumentation/opencensus-proto v0.2.1 // indirect
-	github.com/cespare/xxhash v1.1.0 // indirect
-	github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403 // indirect
-	github.com/cncf/xds/go v0.0.0-20210312221358-fbca930ec8ed // indirect
-	github.com/envoyproxy/go-control-plane v0.9.9-0.20210512163311-63b5d3c536b0 // indirect
-	github.com/envoyproxy/protoc-gen-validate v0.1.0 // indirect
-	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect
-	github.com/golang/protobuf v1.5.2 // indirect
-	github.com/googleapis/gax-go/v2 v2.1.1 // indirect
-	go.opencensus.io v0.23.0 // indirect
-	golang.org/x/oauth2 v0.0.0-20211005180243-6b3c2da341f1 // indirect
-	golang.org/x/text v0.3.6 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
 	google.golang.org/genproto v0.0.0-20211028162531-8db9c33dc351 // indirect
 	google.golang.org/grpc v1.40.0 // indirect
 	google.golang.org/protobuf v1.27.1 // indirect
+	gopkg.in/warnings.v0 v0.1.2 // indirect
+	gopkg.in/yaml.v2 v2.4.0
 )
diff --git a/go.sum b/go.sum
index 76e2445..c0f21e2 100644
--- a/go.sum
+++ b/go.sum
@@ -46,8 +46,10 @@
 cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
 cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20201218220906-28db891af037/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
+github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
 github.com/Microsoft/go-winio v0.4.14/go.mod h1:qXqCSQ3Xa7+6tgxaGTIe4Kpcdsi+P8jBhyzoq1bpyYA=
 github.com/Microsoft/go-winio v0.4.16 h1:FtSW/jqD+l4ba5iPBj9CODVtgfYAD8w2wS923g/cFDk=
 github.com/Microsoft/go-winio v0.4.16/go.mod h1:XB6nPKklQyQ7GC9LdcBEcBl8PF76WugXOPRXwdLnMv0=
@@ -55,20 +57,45 @@
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/ProtonMail/go-crypto v0.0.0-20210428141323-04723f9f07d7 h1:YoJbenK9C67SkzkDfmQuVln04ygHj3vjZfd9FL+GmQQ=
 github.com/ProtonMail/go-crypto v0.0.0-20210428141323-04723f9f07d7/go.mod h1:z4/9nQmJSSwwds7ejkxaJwO37dru3geImFUdJlaLzQo=
+github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
+github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
+github.com/VividCortex/gohistogram v1.0.0/go.mod h1:Pf5mBqqDxYaXu3hDrrU+w6nw50o/4+TcAqDqk/vUH7g=
 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/afex/hystrix-go v0.0.0-20180502004556-fa1af6a1f4f5/go.mod h1:SkGFH1ia65gfNATL8TAiHDNxPzPdmEL5uirI2Uyuz6c=
+github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239 h1:kFOfPq6dUM1hTo4JG6LR5AXSUEsOjtdm0kw0FtQtMJA=
 github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239/go.mod h1:2FmKhYUyUczH0OGQWaF5ceTx0UBShxjsH6f8oGKYe2c=
 github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
+github.com/apache/thrift v0.12.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
+github.com/apache/thrift v0.13.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
+github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
+github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
+github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
 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/aryann/difflib v0.0.0-20170710044230-e206f873d14a/go.mod h1:DAHtR1m6lCRdSC2Tm3DSWRPvIPr6xNKyeHdqDQSQT+A=
+github.com/aws/aws-lambda-go v1.13.3/go.mod h1:4UKl9IzQMoD+QF79YdCuzCwp8VbmG4VAQwij/eHl5CU=
+github.com/aws/aws-sdk-go v1.27.0/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
+github.com/aws/aws-sdk-go-v2 v0.18.0/go.mod h1:JWVYvqSMppoMJC0x5wdwiImzgXTI9FuZwxzkQq9wy+g=
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
+github.com/casbin/casbin/v2 v2.1.2/go.mod h1:YcPU1XXisHhLzuxH9coDNf2FbKpjGlbCg3n9yuLkIJQ=
+github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=
 github.com/census-instrumentation/opencensus-proto v0.2.1 h1:glEXhBS5PSLLv4IXzLA5yPRVX4bilULVyxxbrfOtDAk=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
+github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
 github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
+github.com/clbanning/x2j v0.0.0-20191024224557-825249438eec/go.mod h1:jMjuTZXRI4dUb/I5gc9Hdhagfvm9+RyrPryS/auMzxE=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
 github.com/cncf/udpa/go v0.0.0-20200629203442-efcf912fb354/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
@@ -76,12 +103,27 @@
 github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
 github.com/cncf/xds/go v0.0.0-20210312221358-fbca930ec8ed h1:OZmjad4L3H8ncOIR8rnb5MREYqG8ixi5+WbeUsquF0c=
 github.com/cncf/xds/go v0.0.0-20210312221358-fbca930ec8ed/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
+github.com/cockroachdb/datadriven v0.0.0-20190809214429-80d97fb3cbaa/go.mod h1:zn76sxSg3SzpJ0PPJaLDCu+Bu0Lg3sKTORVIj19EIF8=
+github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd/go.mod h1:sE/e/2PUdi/liOCUjSTXgM1o87ZssimdTWN964YiIeI=
+github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
+github.com/coreos/go-systemd v0.0.0-20180511133405-39ca1b05acc7/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/coreos/pkg v0.0.0-20160727233714-3ac0863d7acf/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
+github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
+github.com/dustin/go-humanize v0.0.0-20171111073723-bb3d318650d4/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
+github.com/eapache/go-resiliency v1.1.0/go.mod h1:kFI+JgMyC7bLPUVY133qvEBtVayf5mFgVsvEsIPBvNs=
+github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21/go.mod h1:+020luEh2TKB4/GOp8oxxtq0Daoen/Cii55CzbTV6DU=
+github.com/eapache/queue v1.1.0/go.mod h1:6eCeP0CKFpHLu8blIFXhExK/dRa7WDZfr6jVFPTqq+I=
+github.com/edsrzf/mmap-go v1.0.0/go.mod h1:YO35OhQPt3KJa3ryjFM5Bs14WD66h8eGKpfaBNrHW5M=
 github.com/emirpasic/gods v1.12.0 h1:QAUIPSaCu4G+POclxeqb3F+WPpdKqFGlw36+yOzGlrg=
 github.com/emirpasic/gods v1.12.0/go.mod h1:YfzfFFoVP/catgzJb4IKIqXjX78Ha8FMSDh3ymbK86o=
+github.com/envoyproxy/go-control-plane v0.6.9/go.mod h1:SBwIajubJHhxtWwsL9s8ss4safvEdbitLhGGK48rN6g=
 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=
@@ -92,7 +134,11 @@
 github.com/envoyproxy/go-control-plane v0.9.9-0.20210512163311-63b5d3c536b0/go.mod h1:hliV/p42l8fGbc6Y9bQ70uLwIvmJyVE5k4iMKlh8wCQ=
 github.com/envoyproxy/protoc-gen-validate v0.1.0 h1:EQciDnbrYxy13PgWoY8AqoxGiPrpgBZ1R8UNe3ddc+A=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
+github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
 github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:xEzjJPgXI435gkrCt3MPfRiAkVrwSbHsst4LCFVfpJc=
+github.com/franela/goblin v0.0.0-20200105215937-c9ffbefa60db/go.mod h1:7dvUGVsVBjqR7JHJk0brhHOZYGmfBYOrK0ZhYMEtBr4=
+github.com/franela/goreq v0.0.0-20171204163338-bcd34c9993f8/go.mod h1:ZhphrRTfi2rbfLwlschooIH4+wKKDR4Pdxhh+TRoA20=
+github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
 github.com/gliderlabs/ssh v0.2.2 h1:6zsha5zo/TWhRhwqCD3+EarCAgZ2yN28ipRnGPnwkI0=
 github.com/gliderlabs/ssh v0.2.2/go.mod h1:U7qILu1NlMHj9FlMhZLlkCdDnU1DBEAqr0aevW3Awn0=
@@ -108,7 +154,21 @@
 github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
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@@ -175,6 +237,7 @@
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@@ -246,20 +446,41 @@
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@@ -328,8 +563,9 @@
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@@ -409,6 +655,7 @@
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@@ -447,6 +701,8 @@
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@@ -475,13 +731,15 @@
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@@ -515,6 +773,7 @@
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@@ -527,6 +786,7 @@
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@@ -582,10 +842,15 @@
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@@ -623,15 +888,23 @@
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@@ -640,6 +913,7 @@
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 honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
@@ -647,6 +921,9 @@
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
 honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.1.3/go.mod h1:NgwopIslSNH47DimFoV78dnkksY2EFtX0ajyb3K/las=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=
diff --git a/internal/worker/log/log.go b/internal/worker/log/log.go
new file mode 100644
index 0000000..3b02053
--- /dev/null
+++ b/internal/worker/log/log.go
@@ -0,0 +1,90 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package log implements event handlers for logging.
+package log
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+	"sync"
+
+	"golang.org/x/exp/event"
+	"golang.org/x/exp/event/severity"
+)
+
+func WithLineLogger(ctx context.Context) context.Context {
+	return event.WithExporter(ctx, event.NewExporter(&lineHandler{w: os.Stderr}, nil))
+}
+
+// lineHandler writes log events one per line in an easy-to-read format:
+// time level message label1=value1 label2=value2 ...
+type lineHandler struct {
+	mu sync.Mutex // ensure a log line is not interrupted
+	w  io.Writer
+}
+
+// Event implements event.Handler.Event for log events.
+func (h *lineHandler) Event(ctx context.Context, ev *event.Event) context.Context {
+	if ev.Kind != event.LogKind {
+		return ctx
+	}
+	h.mu.Lock()
+	defer h.mu.Unlock()
+
+	var msg, level string
+	var others []string
+	for _, lab := range ev.Labels {
+		switch lab.Name {
+		case "msg":
+			msg = lab.String()
+		case "level":
+			level = strings.ToUpper(lab.String())
+		default:
+			others = append(others, fmt.Sprintf("%s=%s", lab.Name, lab.String()))
+		}
+	}
+	var s string
+	if len(others) > 0 {
+		s = " " + strings.Join(others, " ")
+	}
+	if level != "" {
+		level = " " + level
+	}
+	fmt.Fprintf(h.w, "%s%s %s%s\n", ev.At.Format("2006/01/02 15:04:05"), level, msg, s)
+	return ctx
+}
+
+// Info emits one log event at the Info severity.
+func Info(ctx context.Context, message string, labels ...event.Label) {
+	event.Log(ctx, message, append(labels, severity.Info.Label())...)
+}
+
+// Warning emits one log event at the Warning severity.
+func Warning(ctx context.Context, message string, labels ...event.Label) {
+	event.Log(ctx, message, append(labels, severity.Warning.Label())...)
+}
+
+// Error emits one log event at the Error severity.
+func Error(ctx context.Context, message string, labels ...event.Label) {
+	event.Log(ctx, message, append(labels, severity.Error.Label())...)
+}
+
+// Infof logs a formatted message with no labels at the Info severity.
+func Infof(ctx context.Context, format string, args ...interface{}) {
+	Info(ctx, fmt.Sprintf(format, args...))
+}
+
+// Warningf logs a formatted message with no labels at the Warning severity.
+func Warningf(ctx context.Context, format string, args ...interface{}) {
+	Warning(ctx, fmt.Sprintf(format, args...))
+}
+
+// Errorf logs a formatted message with no labels at the Error severity.
+func Errorf(ctx context.Context, format string, args ...interface{}) {
+	Error(ctx, fmt.Sprintf(format, args...))
+}
diff --git a/internal/worker/repo.go b/internal/worker/repo.go
index 5141b8b..13d5390 100644
--- a/internal/worker/repo.go
+++ b/internal/worker/repo.go
@@ -5,13 +5,14 @@
 package worker
 
 import (
-	"log"
+	"context"
 
 	"github.com/go-git/go-git/v5"
 	"github.com/go-git/go-git/v5/plumbing"
 	"github.com/go-git/go-git/v5/plumbing/object"
 	"github.com/go-git/go-git/v5/storage/memory"
 	"golang.org/x/vuln/internal/derrors"
+	"golang.org/x/vuln/internal/worker/log"
 )
 
 const cvelistRepoURL = "https://github.com/CVEProject/cvelist"
@@ -19,7 +20,7 @@
 // cloneRepo returns a repo by cloning the repo at repoURL.
 func cloneRepo(repoURL string) (repo *git.Repository, err error) {
 	defer derrors.Wrap(&err, "cloneRepo(%q)", repoURL)
-	log.Printf("Cloning %q...", repoURL)
+	log.Infof(context.Background(), "Cloning %q...", repoURL)
 	return git.Clone(memory.NewStorage(), nil, &git.CloneOptions{
 		URL:           repoURL,
 		ReferenceName: plumbing.HEAD,
@@ -32,7 +33,7 @@
 // openRepo returns a repo by opening the repo at the local path dirpath.
 func openRepo(dirpath string) (repo *git.Repository, err error) {
 	defer derrors.Wrap(&err, "openRepo(%q)", dirpath)
-	log.Printf("Opening %q...", dirpath)
+	log.Infof(context.Background(), "Opening %q...", dirpath)
 	repo, err = git.PlainOpen(dirpath)
 	if err != nil {
 		return nil, err
diff --git a/internal/worker/update.go b/internal/worker/update.go
index 2c4a767..61f82e8 100644
--- a/internal/worker/update.go
+++ b/internal/worker/update.go
@@ -9,7 +9,6 @@
 	"encoding/json"
 	"fmt"
 	"io"
-	"log"
 	"path"
 	"sort"
 	"strings"
@@ -19,8 +18,10 @@
 	"github.com/go-git/go-git/v5/plumbing"
 	"github.com/go-git/go-git/v5/plumbing/filemode"
 	"github.com/go-git/go-git/v5/plumbing/object"
+	"golang.org/x/exp/event"
 	"golang.org/x/vuln/internal/cveschema"
 	"golang.org/x/vuln/internal/derrors"
+	"golang.org/x/vuln/internal/worker/log"
 	"golang.org/x/vuln/internal/worker/store"
 )
 
@@ -41,10 +42,14 @@
 	defer derrors.Wrap(&err, "doUpdate(%s)", commitHash)
 
 	defer func() {
-		log.Printf("doUpdate finished with error %v", err)
+		if err != nil {
+			log.Error(ctx, "update failed", event.Value("error", err))
+		} else {
+			log.Info(ctx, "update succeeded")
+		}
 	}()
 
-	log.Printf("starting update of %s", commitHash)
+	log.Info(ctx, "update starting", event.String("commit", commitHash.String()))
 
 	// Get all the CVE files.
 	// It is cheaper to read all the files from the repo and compare
@@ -141,7 +146,11 @@
 	if err != nil {
 		return 0, 0, err
 	}
-	log.Printf("%s - %s: applied %d additions, %d modifications", startID, endID, numAdds, numMods)
+	log.Info(ctx, "update transaction",
+		event.String("startID", startID),
+		event.String("endID", endID),
+		event.Int64("adds", int64(numAdds)),
+		event.Int64("mods", int64(numMods)))
 	return numAdds, numMods, nil
 }
 
diff --git a/internal/worker/update_test.go b/internal/worker/update_test.go
index 8ff35c6..514b9f2 100644
--- a/internal/worker/update_test.go
+++ b/internal/worker/update_test.go
@@ -15,6 +15,7 @@
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
 	"golang.org/x/vuln/internal/cveschema"
+	"golang.org/x/vuln/internal/worker/log"
 	"golang.org/x/vuln/internal/worker/store"
 )
 
@@ -44,7 +45,7 @@
 }
 
 func TestDoUpdate(t *testing.T) {
-	ctx := context.Background()
+	ctx := log.WithLineLogger(context.Background())
 	repo, err := readTxtarRepo("testdata/basic.txtar")
 	if err != nil {
 		t.Fatal(err)
diff --git a/internal/worker/worker.go b/internal/worker/worker.go
index d2d17ee..274a325 100644
--- a/internal/worker/worker.go
+++ b/internal/worker/worker.go
@@ -7,9 +7,9 @@
 package worker
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
-	"log"
 	"path"
 	"sort"
 	"strings"
@@ -19,6 +19,7 @@
 	"github.com/go-git/go-git/v5/plumbing/object"
 	"golang.org/x/vuln/internal/cveschema"
 	"golang.org/x/vuln/internal/derrors"
+	"golang.org/x/vuln/internal/worker/log"
 )
 
 // Run clones the CVEProject/cvelist repository and compares the files to the
@@ -39,7 +40,7 @@
 		return err
 	}
 	t := newTriager(triaged)
-	log.Printf("Finding new Go vulnerabilities from CVE list...")
+	log.Infof(context.Background(), "Finding new Go vulnerabilities from CVE list...")
 	if err := walkRepo(repo, root, "", t); err != nil {
 		return err
 	}
@@ -50,7 +51,7 @@
 		}
 	}
 	sort.Strings(newVulns)
-	log.Printf("Found %d new issues from %d CVEs", t.totalVulns(), t.totalCVEs())
+	log.Infof(context.Background(), "Found %d new issues from %d CVEs", t.totalVulns(), t.totalCVEs())
 	for _, v := range newVulns {
 		fmt.Println(v)
 	}