diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..2abab84
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,38 @@
+module github.com/hlandau/acmetool
+
+go 1.13
+
+require (
+	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect
+	github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d // indirect
+	github.com/coreos/go-systemd v0.0.0-00010101000000-000000000000
+	github.com/hlandau/buildinfo v0.0.0-20161112115716-337a29b54997 // indirect
+	github.com/hlandau/dexlogconfig v0.0.0-20161112114350-244f29bd2608
+	github.com/hlandau/goutils v0.0.0-20160722130800-0cdb66aea5b8
+	github.com/hlandau/xlog v1.0.0
+	github.com/jmhodges/clock v0.0.0-20160418191101-880ee4c33548
+	github.com/mattn/go-isatty v0.0.10 // indirect
+	github.com/mattn/go-runewidth v0.0.6 // indirect
+	github.com/mitchellh/go-wordwrap v1.0.0
+	github.com/ogier/pflag v0.0.1 // indirect
+	github.com/peterhellberg/link v1.1.0 // indirect
+	github.com/satori/go.uuid v1.2.0
+	github.com/shiena/ansicolor v0.0.0-20151119151921-a422bbe96644 // indirect
+	golang.org/x/net v0.0.0-20191126235420-ef20fe5d7933
+	gopkg.in/alecthomas/kingpin.v2 v2.2.6
+	gopkg.in/cheggaaa/pb.v1 v1.0.28
+	gopkg.in/hlandau/acmeapi.v2 v2.0.1
+	gopkg.in/hlandau/configurable.v1 v1.0.1 // indirect
+	gopkg.in/hlandau/easyconfig.v1 v1.0.17
+	gopkg.in/hlandau/service.v2 v2.0.16
+	gopkg.in/hlandau/svcutils.v1 v1.0.10
+	gopkg.in/square/go-jose.v1 v1.1.2
+	gopkg.in/square/go-jose.v2 v2.4.0 // indirect
+	gopkg.in/tylerb/graceful.v1 v1.2.15
+	gopkg.in/yaml.v2 v2.2.7
+)
+
+replace (
+	github.com/coreos/go-systemd => github.com/coreos/go-systemd/v22 v22.0.0
+	github.com/satori/go.uuid v1.2.0 => github.com/satori/go.uuid v1.2.1-0.20181028125025-b2ce2384e17b
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..43e3e34
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,72 @@
+github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 h1:JYp7IbQjafoB+tBA3gMyHYHrpOtNuDiK/uB5uXxq5wM=
+github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d h1:UQZhZ2O0vMHr2cI+DC1Mbh0TJxzA3RcLoMsFw+aXw7E=
+github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
+github.com/coreos/go-systemd/v22 v22.0.0 h1:XJIw/+VlJ+87J+doOxznsAWIdmWuViOVhkQamW5YV28=
+github.com/coreos/go-systemd/v22 v22.0.0/go.mod h1:xO0FLkIi5MaZafQlIrOotqXZ90ih+1atmu1JpKERPPk=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/godbus/dbus/v5 v5.0.3 h1:ZqHaoEF7TBzh4jzPmqVhE/5A1z9of6orkAe5uHoAeME=
+github.com/godbus/dbus/v5 v5.0.3/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
+github.com/hlandau/buildinfo v0.0.0-20161112115716-337a29b54997 h1:pSU4Sj7AD5qh+4V5FRlpiw3DpuNQ459c3j8h2F38q74=
+github.com/hlandau/buildinfo v0.0.0-20161112115716-337a29b54997/go.mod h1:Oara+TmqGrvsLVEj5YkFe+PP9cSkp0kFD2PFQ5gjHok=
+github.com/hlandau/dexlogconfig v0.0.0-20161112114350-244f29bd2608 h1:ouW4TuIFOsfgql1NgzTHGgW6esZ41RW5NZwHz3ALXn8=
+github.com/hlandau/dexlogconfig v0.0.0-20161112114350-244f29bd2608/go.mod h1:JpXGCMr2CULPTjnwD8PL9A7YipEitrd+xSHTIK8orHU=
+github.com/hlandau/goutils v0.0.0-20160722130800-0cdb66aea5b8 h1:9aNGW7btNlVqbcqAc2YVwjI0fhZFmoZHkC3+ZJyt1DM=
+github.com/hlandau/goutils v0.0.0-20160722130800-0cdb66aea5b8/go.mod h1:pYz0KEJgONY133I+1Pkmn6MLptkdKyz3SHgGmpDWyFI=
+github.com/hlandau/xlog v1.0.0 h1:tcFGp86iK+v6NwbyuG9wyLB77SBkvAJUjOkRJo3H8C0=
+github.com/hlandau/xlog v1.0.0/go.mod h1:aZl5hrokGCtnAFcvft2givQmKZYVfHRvQJbjoqI2lm8=
+github.com/jmhodges/clock v0.0.0-20160418191101-880ee4c33548 h1:dYTbLf4m0a5u0KLmPfB6mgxbcV7588bOCx79hxa5Sr4=
+github.com/jmhodges/clock v0.0.0-20160418191101-880ee4c33548/go.mod h1:hGT6jSUVzF6no3QaDSMLGLEHtHSBSefs+MgcDWnmhmo=
+github.com/mattn/go-isatty v0.0.10 h1:qxFzApOv4WsAL965uUPIsXzAKCZxN2p9UqdhFS4ZW10=
+github.com/mattn/go-isatty v0.0.10/go.mod h1:qgIWMr58cqv1PHHyhnkY9lrL7etaEgOFcMEpPG5Rm84=
+github.com/mattn/go-runewidth v0.0.6 h1:V2iyH+aX9C5fsYCpK60U8BYIvmhqxuOL3JZcqc1NB7k=
+github.com/mattn/go-runewidth v0.0.6/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
+github.com/mitchellh/go-wordwrap v1.0.0 h1:6GlHJ/LTGMrIJbwgdqdl2eEH8o+Exx/0m8ir9Gns0u4=
+github.com/mitchellh/go-wordwrap v1.0.0/go.mod h1:ZXFpozHsX6DPmq2I0TCekCxypsnAUbP2oI0UX1GXzOo=
+github.com/ogier/pflag v0.0.1 h1:RW6JSWSu/RkSatfcLtogGfFgpim5p7ARQ10ECk5O750=
+github.com/ogier/pflag v0.0.1/go.mod h1:zkFki7tvTa0tafRvTBIZTvzYyAu6kQhPZFnshFFPE+g=
+github.com/peterhellberg/link v1.1.0 h1:s2+RH8EGuI/mI4QwrWGSYQCRz7uNgip9BaM04HKu5kc=
+github.com/peterhellberg/link v1.1.0/go.mod h1:gtSlOT4jmkY8P47hbTc8PTgiDDWpdPbFYl75keYyBB8=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/satori/go.uuid v1.2.0 h1:0uYX9dsZ2yD7q2RtLRtPSdGDWzjeM3TbMJP9utgA0ww=
+github.com/satori/go.uuid v1.2.0/go.mod h1:dA0hQrYB0VpLJoorglMZABFdXlWrHn1NEOzdhQKdks0=
+github.com/satori/go.uuid v1.2.1-0.20181028125025-b2ce2384e17b h1:gQZ0qzfKHQIybLANtM3mBXNUtOfsCFXeTsnBqCsx1KM=
+github.com/satori/go.uuid v1.2.1-0.20181028125025-b2ce2384e17b/go.mod h1:dA0hQrYB0VpLJoorglMZABFdXlWrHn1NEOzdhQKdks0=
+github.com/shiena/ansicolor v0.0.0-20151119151921-a422bbe96644 h1:X+yvsM2yrEktyI+b2qND5gpH8YhURn0k8OCaeRnkINo=
+github.com/shiena/ansicolor v0.0.0-20151119151921-a422bbe96644/go.mod h1:nkxAfR/5quYxwPZhyDxgasBMnRtBZd0FCEpawpjMUFg=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2 h1:VklqNMn3ovrHsnt90PveolxSbWFaJdECFbxSq0Mqo2M=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20191126235420-ef20fe5d7933 h1:e6HwijUxhDe+hPNjZQQn9bA5PW3vNmnN64U2ZW759Lk=
+golang.org/x/net v0.0.0-20191126235420-ef20fe5d7933/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a h1:1BGLXjeY4akVXGgbC9HugT3Jv3hCI0z56oJR5vAMgBU=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20191008105621-543471e840be h1:QAcqgptGM8IQBC9K/RC4o+O9YmqEm0diQn9QmZw/0mU=
+golang.org/x/sys v0.0.0-20191008105621-543471e840be/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6 h1:jMFz6MfLP0/4fUyZle81rXUoxOBFi19VUFKVDOQfozc=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/cheggaaa/pb.v1 v1.0.28 h1:n1tBJnnK2r7g9OW2btFH91V92STTUevLXYFb8gy9EMk=
+gopkg.in/cheggaaa/pb.v1 v1.0.28/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
+gopkg.in/hlandau/acmeapi.v2 v2.0.1 h1:YL92znyd1d2WKPB0EDcN+i/BekIrS9+J2kZfXHrZgBY=
+gopkg.in/hlandau/acmeapi.v2 v2.0.1/go.mod h1:aWwBqx5Cy/gAMFsLZOKe0T/ZUMvy2kmsIIAZFjBOtFc=
+gopkg.in/hlandau/configurable.v1 v1.0.1 h1:rH8g/WXZu2b/eyLagvsqUf9q5mO66hfGHW5L4rm8ktk=
+gopkg.in/hlandau/configurable.v1 v1.0.1/go.mod h1:rlyQpcii/QkMGudMSMoe3jjHAgqLZuqg0hQkiUcNfF8=
+gopkg.in/hlandau/easyconfig.v1 v1.0.17 h1:b35zzqFGh002seeNzseuuXWLJDS0AaL6Isvgx6bsTuE=
+gopkg.in/hlandau/easyconfig.v1 v1.0.17/go.mod h1:fljDHM+/VAXpyEN/45q6RFtcOFnUaF1Wgr6p4LLICoU=
+gopkg.in/hlandau/service.v2 v2.0.16 h1:mmaXq+/O4vXTWEGHdVy+Cy5S7h2djyu8Rodm6qE3oV4=
+gopkg.in/hlandau/service.v2 v2.0.16/go.mod h1:3f+96gui2lGv8llWOAUPi9+oI+TOBIyvlVHa1DUwliA=
+gopkg.in/hlandau/svcutils.v1 v1.0.10 h1:eIasSJy56y3H3rJ0US4EJURTAfHXItiehMxZRRs7TrU=
+gopkg.in/hlandau/svcutils.v1 v1.0.10/go.mod h1:aAoYFMVAq2ck6z8av+FBxzX/qX1ehmUIc5PgGBf+P3I=
+gopkg.in/square/go-jose.v1 v1.1.2 h1:/5jmADZB+RiKtZGr4HxsEFOEfbfsjTKsVnqpThUpE30=
+gopkg.in/square/go-jose.v1 v1.1.2/go.mod h1:QpYS+a4WhS+DTlyQIi6Ka7MS3SuR9a055rgXNEe6EiA=
+gopkg.in/square/go-jose.v2 v2.4.0 h1:0kXPskUMGAXXWJlP05ktEMOV0vmzFQUWw6d+aZJQU8A=
+gopkg.in/square/go-jose.v2 v2.4.0/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
+gopkg.in/tylerb/graceful.v1 v1.2.15 h1:1JmOyhKqAyX3BgTXMI84LwT6FOJ4tP2N9e2kwTCM0nQ=
+gopkg.in/tylerb/graceful.v1 v1.2.15/go.mod h1:yBhekWvR20ACXVObSSdD3u6S9DeSylanL2PAbAC/uJ8=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.7 h1:VUgggvou5XRW9mHwD/yXxIYSMtY0zoKQf/v226p2nyo=
+gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=