repo: Add support for standalone manifests

Added --standalone_manifest to repo tool. If set, the
manifest is downloaded directly from the appropriate source
(currently, we only support GS) and used instead of creating
a manifest git checkout. The manifests.git repo is still created to
keep track of various config but is marked as being for a standalone
manifest so that the repo tool doesn't try to run networked git
commands in it.

BUG=b:192664812
TEST=existing tests (no coverage), manual runs

Change-Id: I84378cbc7f8e515eabeccdde9665efc8cd2a9d21
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/312942
Tested-by: Jack Neus <jackneus@google.com>
Reviewed-by: Mike Frysinger <vapier@google.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/man/repo-init.1 b/man/repo-init.1
index e860f95d..9957b64d 100644
--- a/man/repo-init.1
+++ b/man/repo-init.1
@@ -1,5 +1,5 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man.
-.TH REPO "1" "July 2021" "repo init" "Repo Manual"
+.TH REPO "1" "September 2021" "repo init" "Repo Manual"
 .SH NAME
 repo \- repo init - manual page for repo init
 .SH SYNOPSIS
@@ -31,6 +31,10 @@ manifest branch or revision (use HEAD for default)
 \fB\-m\fR NAME.xml, \fB\-\-manifest\-name\fR=\fI\,NAME\/\fR.xml
 initial manifest file
 .TP
+\fB\-\-standalone\-manifest\fR
+download the manifest as a static file rather then
+create a git checkout of the manifest repo
+.TP
 \fB\-g\fR GROUP, \fB\-\-groups\fR=\fI\,GROUP\/\fR
 restrict manifest projects to ones with specified
 group(s) [default|all|G1,G2,G3|G4,\-G5,\-G6]
@@ -137,6 +141,12 @@ equivalent to using \fB\-b\fR HEAD.
 The optional \fB\-m\fR argument can be used to specify an alternate manifest to be
 used. If no manifest is specified, the manifest default.xml will be used.
 .PP
+If the \fB\-\-standalone\-manifest\fR argument is set, the manifest will be downloaded
+directly from the specified \fB\-\-manifest\-url\fR as a static file (rather than setting
+up a manifest git checkout). With \fB\-\-standalone\-manifest\fR, the manifest will be
+fully static and will not be re\-downloaded during subsesquent `repo init` and
+`repo sync` calls.
+.PP
 The \fB\-\-reference\fR option can be used to point to a directory that has the content
 of a \fB\-\-mirror\fR sync. This will make the working directory use as much data as
 possible from the local reference directory when fetching from the server. This