Currently by default, the new `os-version` capability only exchange the
operating system name between servers and clients i.e "Linux" or
"Windows".

Let's introduce a new configuration option, `osversion.command`, to handle
the string exchange between servers and clients. This option allows
customization of the exchanged string by leveraging the output of the
specified command. This customization might be especially useful on some
quite uncommon platforms like NonStop where interesting OS information is
available from other means than uname(2).

If this new configuration option is not set, the `os-version` capability
exchanges just the operating system name.

Signed-off-by: Usman Akinyemi <redacted>
---

diff --git a/t/t5555-http-smart-common.sh b/t/t5555-http-smart-common.sh

@@ -150,6 +150,34 @@ test_expect_success 'git upload-pack --advertise-refs: v2' '
+test_expect_success 'git upload-pack --advertise-refs: v2 with osVersion.command config set' '
+       test_config osVersion.command "uname -srvm" &&
+       printf "agent=FAKE" >agent_and_long_osversion &&
+
+       if test_have_prereq !WINDOWS
+       then
+               printf "\nos-version=%s\n" $(uname -srvm | test_redact_non_printables) >>agent_and_long_osversion
+       fi &&

diff --git a/t/t5701-git-serve.sh b/t/t5701-git-serve.sh

@@ -53,6 +53,35 @@ test_expect_success 'test capability advertisement' '
+test_expect_success 'test capability advertisement with osVersion.command config set' '
+       test_config osVersion.command "uname -srvm" &&
+       printf "agent=git/$(git version | cut -d" " -f3)" >agent_and_long_osversion &&
+
+       if test_have_prereq !WINDOWS
+       then
+               printf "\nos-version=%s\n" $(uname -srvm | test_redact_non_printables) >>agent_and_long_osversion
+       fi &&