I'm trying to clone source code of Android Marshallow from this link. In the section
Initializing a Repo client
Third point Run repo init to bring down the latest version of Repo with all its most recent bug fixes. You must specify a URL for the manifest, which specifies where the various repositories included in the Android source will be placed within your working directory.
$ repo init -u https://android.googlesource.com/platform/manifest
So I provide this url for manifest
$ repo init -uhttps://android.googlesource.com/platform/manifest/+/refs/heads/android-6.0.1_r9
Then I got this
gpg: keyring `/home/shyam/.repoconfig/gnupg/secring.gpg' created
gpg: keyring `/home/shyam/.repoconfig/gnupg/pubring.gpg' created
gpg: /home/shyam/.repoconfig/gnupg/trustdb.gpg: trustdb created
gpg: key 920F5C65: public key "Repo Maintainer <repo@android.kernel.org>" imported
gpg: key 692B382C: public key "Conley Owens <cco3@android.com>" imported
gpg: Total number processed: 2
gpg: imported: 2 (RSA: 1)
Get https://gerrit.googlesource.com/git-repo/clone.bundle
Get https://gerrit.googlesource.com/git-repo
remote: Finding sources: 100% (15/15)
remote: Total 15 (delta 1), reused 15 (delta 1)
Unpacking objects: 100% (15/15), done.
From https://gerrit.googlesource.com/git-repo
79fba68..8b39fb4 master -> origin/master
Get https://android.googlesource.com/platform/manifest/+/refs/heads/android-6.0.1_r9
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
curl: (22) The requested URL returned error: 404 Not Found
Server does not provide clone.bundle; ignoring.
fatal: remote error: Git repository not found
fatal: remote error: Git repository not found