Thread (14 messages) 14 messages, 6 authors, 2020-12-18

Re: [PATCH 1/1] mailmap: support hashed entries in mailmaps

From: Johannes Sixt <hidden>
Date: 2020-12-13 09:35:14

Am 13.12.20 um 02:05 schrieb brian m. carlson:
Many people, through the course of their lives, will change either a
name or an email address.  For this reason, we have the mailmap, to map
from a user's former name or email address to their current, canonical
forms.  Normally, this works well as it is.

However, sometimes people change a name or an email address and wish to
wholly disassociate themselves from that former name or email address.
For example, a person may have left a company which engaged in a deeply
unethical act with which the person does not want to be associated, or
they may have changed their name to disassociate themselves from an
abusive family or partner.  In such a case, using the former name or
address in any way may be undesirable and the person may wish to replace
it as completely as possible.

For projects which wish to support this, introduce hashed forms into the
mailmap.  These forms, which start with "@sha256:" followed by a SHA-256
hash of the entry, can be used in place of the form used in the commit
field.  This form is intentionally designed to be unlikely to conflict
with legitimate use cases.  For example, this is not a valid email
address according to RFC 5322.  In the unlikely event that a user has
put such a form into the actual commit as their name, we will accept it.

While the form of the data is designed to accept multiple hash
algorithms, we intentionally do not support SHA-1.  There is little
reason to support such a weak algorithm in new use cases and no
backwards compatibility to consider.  Moreover, SHA-256 is faster than
the SHA1DC implementation we use, so this not only improves performance,
but simplifies the current implementation somewhat as well.

Note that it is, of course, possible to perform a lookup on all commit
objects to determine the actual entry which matches the hashed form of
the data.  However, a project for which this feature is valuable may
simply insert entries for many contributors in order to make discovery
of "interesting" entries significantly less convenient.

Signed-off-by: brian m. carlson <redacted>
---
...
quoted hunk ↗ jump to hunk
diff --git a/t/t4203-mailmap.sh b/t/t4203-mailmap.sh
index 586c3a86b1..794133ba5d 100755
--- a/t/t4203-mailmap.sh
+++ b/t/t4203-mailmap.sh
@@ -62,6 +62,41 @@ test_expect_success 'check-mailmap --stdin arguments' '
 	test_cmp expect actual
 '
 
+test_expect_success 'hashed mailmap' '
+	test_config mailmap.file ./hashed &&
+	hashed_author_name="@sha256:$(printf "$GIT_AUTHOR_NAME" | test-tool sha256)" &&
+	hashed_author_email="@sha256:$(printf "$GIT_AUTHOR_EMAIL" | test-tool sha256)" &&
+	cat >expect <<-EOF &&
+	$GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL>
+	EOF
...
+	cat >hashed <<-EOF &&
+	$GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> <$hashed_author_email>
+	EOF
+	git check-mailmap  "$GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>" >actual &&
+	test_cmp expect actual
I don't understand the concept. A mailmap entry of the form

   A <a@b> <x@y>

tells that the former address <x@y>, which is recorded in old project
history, should be replaced by A <a@b> when a commit is displayed. I am
assuming that the idea is that old <x@y> should be the "banned" address.
How does a hashed entry help when the hashed value appears at the right
side of a mailmap entry and that literal string never appears anywhere
in the history?

-- Hannes
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