This command introduces a new concept, "change id". This is similar to
"n" in reflog sha-1 extended syntax @{n}. I'm trying to group changes of
the same second together, and this timestamp becomes "change id", so
you view roughly a snapshot of changes. Of course it's not 100%
accurate. But it works most of the time and it keeps log update low.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
builtin/backup-log.c | 83 +++++++++++++++++++++++++++++++++++++++++++
t/t2080-backup-log.sh | 17 +++++++++
2 files changed, 100 insertions(+)
diff --git a/builtin/backup-log.c b/builtin/backup-log.c
index 75a02c8878..b370ff9d27 100644
--- a/builtin/backup-log.c
+++ b/builtin/backup-log.c
@@ -1,10 +1,13 @@
#include "cache.h"
#include "builtin.h"
#include "backup-log.h"
+#include "dir.h"
+#include "object-store.h"
#include "parse-options.h"
static char const * const backup_log_usage[] = {
N_("git backup-log [--path=<path> | --id=<id>] update <path> <old-hash> <new-hash>"),
+ N_("git backup-log [--path=<path> | --id=<id>] cat [<options>] <change-id> <path>"),
NULL
};
@@ -34,6 +37,84 @@ static int update(int argc, const char **argv,
return ret;
}
+struct cat_options {
+ timestamp_t id;
+ char *path;
+ int before;
+ int show_hash;
+};
+
+static int cat_parse(struct strbuf *line, void *data)
+{
+ struct cat_options *opts = data;
+ struct bkl_entry entry;
+ struct object_id *oid;
+ void *buf;
+ unsigned long size;
+ enum object_type type;
+
+ if (bkl_parse_entry(line, &entry))
+ return -1;
+
+ if (entry.timestamp < opts->id)
+ return 2;
+
+ if (entry.timestamp != opts->id ||
+ fspathcmp(entry.path, opts->path))
+ return 0;
+
+ if (opts->before)
+ oid = &entry.old_oid;
+ else
+ oid = &entry.new_oid;
+
+ if (opts->show_hash) {
+ puts(oid_to_hex(oid));
+ return 1;
+ }
+
+ if (is_null_oid(oid))
+ return 1; /* treat null oid like empty blob */
+
+ buf = read_object_file(oid, &type, &size);
+ if (!buf)
+ die(_("object not found: %s"), oid_to_hex(oid));
+ if (type != OBJ_BLOB)
+ die(_("not a blob: %s"), oid_to_hex(oid));
+
+ write_in_full(1, buf, size);
+ free(buf);
+
+ return 1;
+}
+
+static int cat(int argc, const char **argv,
+ const char *prefix, const char *log_path)
+{
+ struct cat_options opts;
+ struct option options[] = {
+ OPT_BOOL(0, "before", &opts.before, N_("select the version before the update")),
+ OPT_BOOL(0, "hash", &opts.show_hash, N_("show the hash instead of the content")),
+ OPT_END()
+ };
+ char *end = NULL;
+ int ret;
+
+ memset(&opts, 0, sizeof(opts));
+ argc = parse_options(argc, argv, prefix, options, backup_log_usage, 0);
+ if (argc != 2)
+ usage_with_options(backup_log_usage, options);
+ opts.id = strtol(argv[0], &end, 10);
+ if (!end || *end)
+ die(_("not a valid change id: %s"), argv[0]);
+ opts.path = prefix_path(prefix, prefix ? strlen(prefix) : 0, argv[1]);
+ setup_pager();
+ ret = bkl_parse_file_reverse(log_path, cat_parse, &opts);
+ if (ret < 0)
+ die(_("failed to parse '%s'"), log_path);
+ return ret - 1;
+}
+
static char *log_id_to_path(const char *id)
{
if (!strcmp(id, "index"))
@@ -73,6 +154,8 @@ int cmd_backup_log(int argc, const char **argv, const char *prefix)
if (!strcmp(argv[0], "update"))
return update(argc, argv, prefix, log_path);
+ else if (!strcmp(argv[0], "cat"))
+ return cat(argc, argv, prefix, log_path);
else
die(_("unknown subcommand: %s"), argv[0]);
diff --git a/t/t2080-backup-log.sh b/t/t2080-backup-log.sh
index 8d1c8c5935..9c004c9727 100755
--- a/t/t2080-backup-log.sh
+++ b/t/t2080-backup-log.sh
@@ -88,4 +88,21 @@ test_expect_success 'apply --cached writes backup log' '
test_cmp expected .git/index.bkl
'
+test_expect_success 'backup-log cat' '
+ OLD=$(git rev-parse :./initial.t) &&
+ echo update >>initial.t &&
+ test_tick &&
+ git -c core.backupLog=true add initial.t &&
+ NEW=$(git rev-parse :./initial.t) &&
+ git backup-log --id=index cat --before --hash $test_tick initial.t >actual &&
+ echo $OLD >expected &&
+ test_cmp expected actual &&
+ git backup-log --id=index cat --hash $test_tick initial.t >actual &&
+ echo $NEW >expected &&
+ test_cmp expected actual &&
+ git backup-log --id=index cat $test_tick initial.t >actual &&
+ git cat-file blob $NEW >expected &&
+ test_cmp expected actual
+'
+
test_done
--
2.20.0.rc2.486.g9832c05c3d
