dotenv sops config variables do not maintain a specific order after editing

[Jdban]

After modifying a dotenv file, the order of the sops config variables changes almost every time.

To replicate:
Encrypt a file:

$ sops test.env
# Write anything to this file and then save

File contents:

test=ENC[AES256_GCM,data:f8ibOw==,iv:/g2z6X6XcEwdxlZ5+HtgoP+wOaU9LTgoh9CM0avgk2c=,tag:ml0DeSfTOj51KSLJlumf3w==,type:str]
sops_gcp_kms__list_0__map_enc=CiQABebv2SYGzUmZgUmntqdHK6Fj5izjHlOxtQoJTM5GIqT4CdMSSAD88dFLDQcNkP5HkVpDlIdoTdpqV+A8MV2T3sGYEODtzKVONicytUo3MGoiUCe0kcbBrb2xnhM7Igr53dNQ+fyuxj8kEQEsbA==
sops_gcp_kms__list_0__map_resource_id=projects/asdassad/locations/global/keyRings/test/cryptoKeys/test
sops_mac=ENC[AES256_GCM,data:oo0NvabZUttruSC3HpVS3LJGmQoc9wQbK7EKZ2AhDgqT4jZbOBthHN9JAElEBndlu6Wo2V7kXPjMkFEa30sI5T1LRHhNV8rYAvtYzd7MeaVJCgdePRu/FD2z1J6JkX9/3xWMDCclHTWBjYuzPU6zf5edInLl8WVFKoJxIoBzJAs=,iv:Qdy4EofXViYGw6fIeM4GKAtaSWSvKi2xAQqOofGF9ck=,tag:3iG8CqYYf0yNtQqKBa0+Pg==,type:str]
sops_gcp_kms__list_0__map_created_at=2019-11-05T23:49:57Z
sops_unencrypted_suffix=_unencrypted
sops_version=3.4.0
sops_lastmodified=2019-11-05T23:50:09Z

Modify the file to something else and save.
File contents:

test=ENC[AES256_GCM,data:0m7DUFs=,iv:yQUpGKEReCirChGR0U2GY/RQMqoIECBRHEHH0Wr1q5c=,tag:tivZbpEQhO7OHlAHHFJryw==,type:str]
sops_mac=ENC[AES256_GCM,data:ztm2S6ZFWSxpyxRZ1bg9W7X1xArG+VkxRKrJ5cIgwT370sRpnYPX2xYh3RaoC74T49pd2VLgNs7EvlawObfRa7MtnH6nozHLp5hGxy1tOkphVRV4u3nRZudFt8c0ul7EU+N9irsZlEjFWw0qpqOBay20nhYi9Nj5c1zzkX1LpfE=,iv:Xm+N2fEaWdxV2ejc3b1OfK/eYab+NlQ+hTgjKp0qg70=,tag:x6d7Pfvkq/GUCvdVOr1hDQ==,type:str]
sops_gcp_kms__list_0__map_created_at=2019-11-05T23:49:57Z
sops_lastmodified=2019-11-05T23:51:31Z
sops_gcp_kms__list_0__map_enc=CiQABebv2SYGzUmZgUmntqdHK6Fj5izjHlOxtQoJTM5GIqT4CdMSSAD88dFLDQcNkP5HkVpDlIdoTdpqV+A8MV2T3sGYEODtzKVONicytUo3MGoiUCe0kcbBrb2xnhM7Igr53dNQ+fyuxj8kEQEsbA==
sops_gcp_kms__list_0__map_resource_id=projects/asdassad/locations/global/keyRings/test/cryptoKeys/test
sops_unencrypted_suffix=_unencrypted
sops_version=3.4.0

Notice that the sops config is not in the same order after modifying. They should be in the same order no matter how many times you modify and save the file.

Screenshot of diff:

I get that order doesn't matter in a dotenv file, but this is extremely annoying for diffs and defeats some of the purpose of sops.

[autrilla]

I get that order doesn't matter in a dotenv file, but this is extremely annoying for diffs and defeats some of the purpose of sops.

I agree!

The cause is somewhat obvious:

https://github.com/mozilla/sops/blob/14a22d7a7060a0fba06c5dd716898d47728f0fce/stores/dotenv/store.go#L97

Maps are unsorted in Go. They could just be sorted alphabetically before and this issue should disappear.