[PATCH v2 4/5] commit-graph: add --version=<n> option

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From: Derrick Stolee <dstolee@xxxxxxxxxxxxx>

Allow the commit-graph builtin to specify the file format version
using the '--version=<n>' option. Specify the version exactly in
the verification tests as using a different version would change
the offsets used in those tests.

Signed-off-by: Derrick Stolee <dstolee@xxxxxxxxxxxxx>
---
 Documentation/git-commit-graph.txt |  3 +++
 builtin/commit-graph.c             | 13 +++++++++++--
 t/t5318-commit-graph.sh            |  2 +-
 3 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/Documentation/git-commit-graph.txt b/Documentation/git-commit-graph.txt
index 624470e198..1d1cc70de4 100644
--- a/Documentation/git-commit-graph.txt
+++ b/Documentation/git-commit-graph.txt
@@ -51,6 +51,9 @@ or `--stdin-packs`.)
 +
 With the `--append` option, include all commits that are present in the
 existing commit-graph file.
++
+With the `--version=<n>` option, specify the file format version. Used
+only for testing.
 
 'read'::
 
diff --git a/builtin/commit-graph.c b/builtin/commit-graph.c
index 828b1a713f..65ceb7a141 100644
--- a/builtin/commit-graph.c
+++ b/builtin/commit-graph.c
@@ -10,7 +10,7 @@ static char const * const builtin_commit_graph_usage[] = {
 	N_("git commit-graph [--object-dir <objdir>]"),
 	N_("git commit-graph read [--object-dir <objdir>]"),
 	N_("git commit-graph verify [--object-dir <objdir>]"),
-	N_("git commit-graph write [--object-dir <objdir>] [--append] [--reachable|--stdin-packs|--stdin-commits]"),
+	N_("git commit-graph write [--object-dir <objdir>] [--append] [--reachable|--stdin-packs|--stdin-commits] [--version=<n>]"),
 	NULL
 };
 
@@ -25,7 +25,7 @@ static const char * const builtin_commit_graph_read_usage[] = {
 };
 
 static const char * const builtin_commit_graph_write_usage[] = {
-	N_("git commit-graph write [--object-dir <objdir>] [--append] [--reachable|--stdin-packs|--stdin-commits]"),
+	N_("git commit-graph write [--object-dir <objdir>] [--append] [--reachable|--stdin-packs|--stdin-commits] [--version=<n>]"),
 	NULL
 };
 
@@ -35,6 +35,7 @@ static struct opts_commit_graph {
 	int stdin_packs;
 	int stdin_commits;
 	int append;
+	int version;
 } opts;
 
 
@@ -156,6 +157,8 @@ static int graph_write(int argc, const char **argv)
 			N_("start walk at commits listed by stdin")),
 		OPT_BOOL(0, "append", &opts.append,
 			N_("include all commits already in the commit-graph file")),
+		OPT_INTEGER(0, "version", &opts.version,
+			N_("specify the file format version")),
 		OPT_END(),
 	};
 
@@ -170,6 +173,12 @@ static int graph_write(int argc, const char **argv)
 	if (opts.append)
 		flags |= COMMIT_GRAPH_APPEND;
 
+	switch (opts.version) {
+	case 1:
+		flags |= COMMIT_GRAPH_VERSION_1;
+		break;
+	}
+
 	read_replace_refs = 0;
 
 	if (opts.reachable)
diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh
index e80c1cac02..4eb5a09ef3 100755
--- a/t/t5318-commit-graph.sh
+++ b/t/t5318-commit-graph.sh
@@ -328,7 +328,7 @@ test_expect_success 'replace-objects invalidates commit-graph' '
 
 test_expect_success 'git commit-graph verify' '
 	cd "$TRASH_DIRECTORY/full" &&
-	git rev-parse commits/8 | git commit-graph write --stdin-commits &&
+	git rev-parse commits/8 | git commit-graph write --stdin-commits --version=1 &&
 	git commit-graph verify >output
 '
 
-- 
gitgitgadget




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