There's an example of using your own bit of shell to act as a credential
helper, but it's not very realistic:

 - It's stupid to hand out your secret password to _every_ host. In the
   real world you'd use the config-matcher to limit it to a particular
   host.

 - We never provided a username. We can easily do that in another config
   option (you can do it in the helper, too, but this is much more
   readable).

 - We were sending the secret even for store/erase operations. This
   is OK because Git would just ignore it, but a real system would
   probably be unlocking a password store, which you wouldn't want to do
   more than necessary.

Signed-off-by: Jeff King <redacted>
---
This is in fact very close to what's in my own ~/.gitconfig, except that
I swap out "cat" for the "pass" tool.

 Documentation/gitcredentials.txt | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Documentation/gitcredentials.txt b/Documentation/gitcredentials.txt
index 8a20343dd7..63b20fc6a5 100644
--- a/Documentation/gitcredentials.txt
+++ b/Documentation/gitcredentials.txt

@@ -233,8 +233,9 @@ helper = "foo --bar='whitespace arg'"
 helper = "/path/to/my/helper --with-arguments"
 
 # or you can specify your own shell snippet
-[credential]
-helper = "!f() { echo password=$(cat $HOME/.secret); }; f"
+[credential "https://example.com"]
+username = your_user
+helper = "!f() { test $1 = get && echo password=$(cat $HOME/.secret); }; f"
 ----------------------------------------------------
 
 Generally speaking, rule (3) above is the simplest for users to specify.

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