It is possible to have multiple commit graph files in a directory, but
only one is important at a time.
Use a 'graph-latest' file to point to the important file. Teach
git-commit-graph to write 'graph-latest' when given the "--set-latest"
option. Using this 'graph-latest' file is more robust than relying on
directory scanning and modified times.
Signed-off-by: Derrick Stolee <dsto...@microsoft.com>
---
Documentation/git-commit-graph.txt | 10 ++++++++++
builtin/commit-graph.c | 26 ++++++++++++++++++++++++--
commit-graph.c | 7 +++++++
commit-graph.h | 2 ++
t/t5318-commit-graph.sh | 24 +++++++++++++++++++-----
5 files changed, 62 insertions(+), 7 deletions(-)
diff --git a/Documentation/git-commit-graph.txt
b/Documentation/git-commit-graph.txt
index 6d26e56..dc948c5 100644
--- a/Documentation/git-commit-graph.txt
+++ b/Documentation/git-commit-graph.txt
@@ -34,6 +34,9 @@ COMMANDS
Write a commit graph file based on the commits found in packfiles.
Includes all commits from the existing commit graph file. Outputs the
resulting filename.
++
+With `--set-latest` option, update the graph-latest file to point
+to the written graph file.
'read'::
@@ -53,6 +56,13 @@ EXAMPLES
$ git commit-graph write
------------------------------------------------
+* Write a graph file for the packed commits in your local .git folder
+* and update graph-latest.
++
+------------------------------------------------
+$ git commit-graph write --set-latest
+------------------------------------------------
+
* Read basic information from a graph file.
+
------------------------------------------------
diff --git a/builtin/commit-graph.c b/builtin/commit-graph.c
index 28cd097..bf86172 100644
--- a/builtin/commit-graph.c
+++ b/builtin/commit-graph.c
@@ -8,7 +8,7 @@
static char const * const builtin_commit_graph_usage[] = {
N_("git commit-graph [--object-dir <objdir>]"),
N_("git commit-graph read [--object-dir <objdir>] [--file=<hash>]"),
- N_("git commit-graph write [--object-dir <objdir>]"),
+ N_("git commit-graph write [--object-dir <objdir>] [--set-latest]"),
NULL
};
@@ -18,13 +18,14 @@ 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>]"),
+ N_("git commit-graph write [--object-dir <objdir>] [--set-latest]"),
NULL
};
static struct opts_commit_graph {
const char *obj_dir;
const char *graph_file;
+ int set_latest;
} opts;
static int graph_read(int argc, const char **argv)
@@ -81,6 +82,22 @@ static int graph_read(int argc, const char **argv)
return 0;
}
+static void set_latest_file(const char *obj_dir, const char *graph_file)
+{
+ int fd;
+ struct lock_file lk = LOCK_INIT;
+ char *latest_fname = get_graph_latest_filename(obj_dir);
+
+ fd = hold_lock_file_for_update(&lk, latest_fname, LOCK_DIE_ON_ERROR);
+ FREE_AND_NULL(latest_fname);
+
+ if (fd < 0)
+ die_errno("unable to open graph-head");
+
+ write_in_full(fd, graph_file, strlen(graph_file));
+ commit_lock_file(&lk);
+}
+
static int graph_write(int argc, const char **argv)
{
char *graph_name;
@@ -89,6 +106,8 @@ static int graph_write(int argc, const char **argv)
{ OPTION_STRING, 'o', "object-dir", &opts.obj_dir,
N_("dir"),
N_("The object directory to store the graph") },
+ OPT_BOOL('u', "set-latest", &opts.set_latest,
+ N_("update graph-head to written graph file")),
OPT_END(),
};
@@ -102,6 +121,9 @@ static int graph_write(int argc, const char **argv)
graph_name = write_commit_graph(opts.obj_dir);
if (graph_name) {
+ if (opts.set_latest)
+ set_latest_file(opts.obj_dir, graph_name);
+
printf("%s\n", graph_name);
FREE_AND_NULL(graph_name);
}
diff --git a/commit-graph.c b/commit-graph.c
index 2a8594f..5ee0805 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -38,6 +38,13 @@
#define GRAPH_MIN_SIZE (GRAPH_CHUNKLOOKUP_SIZE + GRAPH_FANOUT_SIZE + \
GRAPH_OID_LEN + 8)
+char *get_graph_latest_filename(const char *obj_dir)
+{
+ struct strbuf fname = STRBUF_INIT;
+ strbuf_addf(&fname, "%s/info/graph-latest", obj_dir);
+ return strbuf_detach(&fname, 0);
+}
+
static struct commit_graph *alloc_commit_graph(void)
{
struct commit_graph *g = xmalloc(sizeof(*g));
diff --git a/commit-graph.h b/commit-graph.h
index 9093b97..ae24b3a 100644
--- a/commit-graph.h
+++ b/commit-graph.h
@@ -3,6 +3,8 @@
#include "git-compat-util.h"
+extern char *get_graph_latest_filename(const char *obj_dir);
+
struct commit_graph {
int graph_fd;
diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh
index 893fa24..cad9d90 100755
--- a/t/t5318-commit-graph.sh
+++ b/t/t5318-commit-graph.sh
@@ -12,7 +12,8 @@ test_expect_success 'setup full repo' '
'
test_expect_success 'write graph with no packs' '
- git commit-graph write --object-dir .
+ git commit-graph write --object-dir . &&
+ test_path_is_missing info/graph-latest
'
test_expect_success 'create commits and repack' '
@@ -42,6 +43,7 @@ graph_read_expect() {
test_expect_success 'write graph' '
graph1=$(git commit-graph write) &&
test_path_is_file $objdir/info/$graph1 &&
+ test_path_is_missing $objdir/info/graph-latest &&
git commit-graph read --file=$graph1 >output &&
graph_read_expect "3" &&
test_cmp expect output
@@ -84,8 +86,11 @@ test_expect_success 'Add more commits' '
test_expect_success 'write graph with merges' '
- graph2=$(git commit-graph write)&&
+ graph2=$(git commit-graph write --set-latest)&&
test_path_is_file $objdir/info/$graph2 &&
+ test_path_is_file $objdir/info/graph-latest &&
+ printf $graph2 >expect &&
+ test_cmp expect $objdir/info/graph-latest &&
git commit-graph read --file=$graph2 >output &&
graph_read_expect "10" "large_edges" &&
test_cmp expect output
@@ -112,19 +117,25 @@ test_expect_success 'Add one more commit' '
# 1
test_expect_success 'write graph with new commit' '
- graph3=$(git commit-graph write) &&
+ graph3=$(git commit-graph write --set-latest) &&
test_path_is_file $objdir/info/$graph3 &&
+ test_path_is_file $objdir/info/graph-latest &&
+ printf $graph3 >expect &&
+ test_cmp expect $objdir/info/graph-latest &&
git commit-graph read --file=$graph3 >output &&
graph_read_expect "11" "large_edges" &&
test_cmp expect output
'
test_expect_success 'write graph with nothing new' '
- graph4=$(git commit-graph write) &&
+ graph4=$(git commit-graph write --set-latest) &&
test_path_is_file $objdir/info/$graph4 &&
printf $graph3 >expect &&
printf $graph4 >output &&
test_cmp expect output &&
+ test_path_is_file $objdir/info/graph-latest &&
+ printf $graph4 >expect &&
+ test_cmp expect $objdir/info/graph-latest &&
git commit-graph read --file=$graph4 >output &&
graph_read_expect "11" "large_edges" &&
test_cmp expect output
@@ -138,8 +149,11 @@ test_expect_success 'setup bare repo' '
'
test_expect_success 'write graph in bare repo' '
- graphbare=$(git commit-graph write) &&
+ graphbare=$(git commit-graph write --set-latest) &&
test_path_is_file $baredir/info/$graphbare &&
+ test_path_is_file $baredir/info/graph-latest &&
+ printf $graphbare >expect &&
+ test_cmp expect $baredir/info/graph-latest &&
git commit-graph read --file=$graphbare >output &&
graph_read_expect "11" "large_edges" &&
test_cmp expect output
--
2.7.4
