On Thu, Mar 14, 2013 at 03:10:46AM -0400, Jeff King wrote:
> I looked into this a little. The first sticking point is that
> git_config_with_options needs to support the alternate source. Here's a
> sketch of what I think the solution should look like, on top of your
> patches.
Here it is again, with two changes:
1. Rather than handling the blob lookup inline in
git_config_with_options, it adds direct functions for reading
config from blob sha1s and blob references. I think this should
make it easier to reuse when you are trying to read .gitmodules
from C code.
2. It adds some basic tests.
I'll leave it here for tonight. The next step would be to rebase it on
your modified series (in particular, I think git_config_from_strbuf
should become git_config_from_buf, which will impact this).
Feel free to use, pick apart, rewrite, or discard as you see fit for
your series.
diff --git a/builtin/config.c b/builtin/config.c
index 33c9bf9..8d01b7a 100644
--- a/builtin/config.c
+++ b/builtin/config.c
@@ -21,6 +21,7 @@ static const char *given_config_file;
static int use_global_config, use_system_config, use_local_config;
static const char *given_config_file;
+static const char *given_config_blob;
static int actions, types;
static const char *get_color_slot, *get_colorbool_slot;
static int end_null;
@@ -53,6 +54,7 @@ static struct option builtin_config_options[] = {
OPT_BOOLEAN(0, "system", &use_system_config, N_("use system config
file")),
OPT_BOOLEAN(0, "local", &use_local_config, N_("use repository config
file")),
OPT_STRING('f', "file", &given_config_file, N_("file"), N_("use given
config file")),
+ OPT_STRING(0, "blob", &given_config_blob, N_("blob-id"), N_("read
config from given blob object")),
OPT_GROUP(N_("Action")),
OPT_BIT(0, "get", &actions, N_("get value: name [value-regex]"),
ACTION_GET),
OPT_BIT(0, "get-all", &actions, N_("get all values: key
[value-regex]"), ACTION_GET_ALL),
@@ -218,7 +220,8 @@ static int get_value(const char *key_, const char *regex_)
}
git_config_with_options(collect_config, &values,
- given_config_file, respect_includes);
+ given_config_file, given_config_blob,
+ respect_includes);
ret = !values.nr;
@@ -302,7 +305,8 @@ static void get_color(const char *def_color)
get_color_found = 0;
parsed_color[0] = '\0';
git_config_with_options(git_get_color_config, NULL,
- given_config_file, respect_includes);
+ given_config_file, given_config_blob,
+ respect_includes);
if (!get_color_found && def_color)
color_parse(def_color, "command line", parsed_color);
@@ -330,7 +334,8 @@ static int get_colorbool(int print)
get_colorbool_found = -1;
get_diff_color_found = -1;
git_config_with_options(git_get_colorbool_config, NULL,
- given_config_file, respect_includes);
+ given_config_file, given_config_blob,
+ respect_includes);
if (get_colorbool_found < 0) {
if (!strcmp(get_colorbool_slot, "color.diff"))
@@ -348,6 +353,12 @@ static int get_colorbool(int print)
return get_colorbool_found ? 0 : 1;
}
+static void check_blob_write(void)
+{
+ if (given_config_blob)
+ die("writing config blobs is not supported");
+}
+
int cmd_config(int argc, const char **argv, const char *prefix)
{
int nongit = !startup_info->have_repository;
@@ -359,7 +370,8 @@ int cmd_config(int argc, const char **argv, const char
*prefix)
builtin_config_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
- if (use_global_config + use_system_config + use_local_config +
!!given_config_file > 1) {
+ if (use_global_config + use_system_config + use_local_config +
+ !!given_config_file + !!given_config_blob > 1) {
error("only one config file at a time.");
usage_with_options(builtin_config_usage,
builtin_config_options);
}
@@ -438,6 +450,7 @@ int cmd_config(int argc, const char **argv, const char
*prefix)
check_argc(argc, 0, 0);
if (git_config_with_options(show_all_config, NULL,
given_config_file,
+ given_config_blob,
respect_includes) < 0) {
if (given_config_file)
die_errno("unable to read config file '%s'",
@@ -450,6 +463,8 @@ int cmd_config(int argc, const char **argv, const char
*prefix)
check_argc(argc, 0, 0);
if (!given_config_file && nongit)
die("not in a git directory");
+ if (given_config_blob)
+ die("editing blobs is not supported");
git_config(git_default_config, NULL);
launch_editor(given_config_file ?
given_config_file : git_path("config"),
@@ -457,6 +472,7 @@ int cmd_config(int argc, const char **argv, const char
*prefix)
}
else if (actions == ACTION_SET) {
int ret;
+ check_blob_write();
check_argc(argc, 2, 2);
value = normalize_value(argv[0], argv[1]);
ret = git_config_set_in_file(given_config_file, argv[0], value);
@@ -466,18 +482,21 @@ int cmd_config(int argc, const char **argv, const char
*prefix)
return ret;
}
else if (actions == ACTION_SET_ALL) {
+ check_blob_write();
check_argc(argc, 2, 3);
value = normalize_value(argv[0], argv[1]);
return git_config_set_multivar_in_file(given_config_file,
argv[0], value, argv[2],
0);
}
else if (actions == ACTION_ADD) {
+ check_blob_write();
check_argc(argc, 2, 2);
value = normalize_value(argv[0], argv[1]);
return git_config_set_multivar_in_file(given_config_file,
argv[0], value, "^$", 0);
}
else if (actions == ACTION_REPLACE_ALL) {
+ check_blob_write();
check_argc(argc, 2, 3);
value = normalize_value(argv[0], argv[1]);
return git_config_set_multivar_in_file(given_config_file,
@@ -500,6 +519,7 @@ int cmd_config(int argc, const char **argv, const char
*prefix)
return get_value(argv[0], argv[1]);
}
else if (actions == ACTION_UNSET) {
+ check_blob_write();
check_argc(argc, 1, 2);
if (argc == 2)
return
git_config_set_multivar_in_file(given_config_file,
@@ -509,12 +529,14 @@ int cmd_config(int argc, const char **argv, const char
*prefix)
argv[0], NULL);
}
else if (actions == ACTION_UNSET_ALL) {
+ check_blob_write();
check_argc(argc, 1, 2);
return git_config_set_multivar_in_file(given_config_file,
argv[0], NULL, argv[1],
1);
}
else if (actions == ACTION_RENAME_SECTION) {
int ret;
+ check_blob_write();
check_argc(argc, 2, 2);
ret = git_config_rename_section_in_file(given_config_file,
argv[0], argv[1]);
@@ -525,6 +547,7 @@ int cmd_config(int argc, const char **argv, const char
*prefix)
}
else if (actions == ACTION_REMOVE_SECTION) {
int ret;
+ check_blob_write();
check_argc(argc, 1, 1);
ret = git_config_rename_section_in_file(given_config_file,
argv[0], NULL);
diff --git a/cache.h b/cache.h
index a2621fa..9db5f74 100644
--- a/cache.h
+++ b/cache.h
@@ -1134,7 +1134,9 @@ extern int git_config_with_options(config_fn_t fn, void *,
extern int git_config_from_parameters(config_fn_t fn, void *data);
extern int git_config(config_fn_t fn, void *);
extern int git_config_with_options(config_fn_t fn, void *,
- const char *filename, int respect_includes);
+ const char *filename,
+ const char *blob_ref,
+ int respect_includes);
extern int git_config_early(config_fn_t fn, void *, const char *repo_config);
extern int git_parse_ulong(const char *, unsigned long *);
extern int git_config_int(const char *, const char *);
diff --git a/config.c b/config.c
index b8c8640..5c492a8 100644
--- a/config.c
+++ b/config.c
@@ -1009,6 +1009,47 @@ int git_config_from_strbuf(config_fn_t fn, const char
*name, struct strbuf *strb
return do_config_from_source(&top, fn, data);
}
+static int git_config_from_blob_sha1(config_fn_t fn,
+ const char *name,
+ const unsigned char *sha1,
+ void *data)
+{
+ struct strbuf sb = STRBUF_INIT;
+ enum object_type type;
+ void *buf;
+ unsigned long size;
+ int ret;
+
+ buf = read_sha1_file(sha1, &type, &size);
+ if (!buf)
+ return error("unable to load config blob object '%s'", name);
+ if (type != OBJ_BLOB) {
+ free(buf);
+ return error("reference '%s' does not point to a blob", name);
+ }
+
+ /*
+ * read_sha1_file always NUL-terminates for us, so size+1 is OK;
+ * we could skip this step if we had git_config_from_buf
+ */
+ strbuf_attach(&sb, buf, size, size+1);
+ ret = git_config_from_strbuf(fn, name, &sb, data);
+ strbuf_release(&sb);
+
+ return ret;
+}
+
+static int git_config_from_blob_ref(config_fn_t fn,
+ const char *name,
+ void *data)
+{
+ unsigned char sha1[20];
+
+ if (get_sha1(name, sha1) < 0)
+ return error("unable to resolve config blob '%s'", name);
+ return git_config_from_blob_sha1(fn, name, sha1, data);
+}
+
const char *git_etc_gitconfig(void)
{
static const char *system_wide;
@@ -1074,7 +1115,9 @@ int git_config_with_options(config_fn_t fn, void *data,
}
int git_config_with_options(config_fn_t fn, void *data,
- const char *filename, int respect_includes)
+ const char *filename,
+ const char *blob_ref,
+ int respect_includes)
{
char *repo_config = NULL;
int ret;
@@ -1093,6 +1136,8 @@ int git_config_with_options(config_fn_t fn, void *data,
*/
if (filename)
return git_config_from_file(fn, filename, data);
+ else if (blob_ref)
+ return git_config_from_blob_ref(fn, blob_ref, data);
repo_config = git_pathdup("config");
ret = git_config_early(fn, data, repo_config);
@@ -1103,7 +1148,7 @@ int git_config(config_fn_t fn, void *data)
int git_config(config_fn_t fn, void *data)
{
- return git_config_with_options(fn, data, NULL, 1);
+ return git_config_with_options(fn, data, NULL, NULL, 1);
}
/*
diff --git a/t/t1307-config-blob.sh b/t/t1307-config-blob.sh
index e69de29..141ca21 100755
--- a/t/t1307-config-blob.sh
+++ b/t/t1307-config-blob.sh
@@ -0,0 +1,66 @@
+#!/bin/sh
+
+test_description='support for reading config from a blob'
+. ./test-lib.sh
+
+test_expect_success 'create config blob' '
+ cat >config <<-\EOF &&
+ [some]
+ value = 1
+ EOF
+ git add config &&
+ git commit -m foo
+'
+
+test_expect_success 'list config blob contents' '
+ echo some.value=1 >expect &&
+ git config --blob=HEAD:config --list >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'fetch value from blob' '
+ echo true >expect &&
+ git config --blob=HEAD:config --bool some.value >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'reading from blob and file is an error' '
+ test_must_fail git config --blob=HEAD:config --system --list
+'
+
+test_expect_success 'reading from missing ref is an error' '
+ test_must_fail git config --blob=HEAD:doesnotexist --list
+'
+
+test_expect_success 'reading from non-blob is an error' '
+ test_must_fail git config --blob=HEAD --list
+'
+
+test_expect_success 'setting a value in a blob is an error' '
+ test_must_fail git config --blob=HEAD:config some.value foo
+'
+
+test_expect_success 'deleting a value in a blob is an error' '
+ test_must_fail git config --blob=HEAD:config --unset some.value
+'
+
+test_expect_success 'editing a blob is an error' '
+ test_must_fail git config --blob=HEAD:config --edit
+'
+
+test_expect_success 'parse errors in blobs are properly attributed' '
+ cat >config <<-\EOF &&
+ [some]
+ value = "
+ EOF
+ git add config &&
+ git commit -m broken &&
+
+ test_must_fail git config --blob=HEAD:config some.value 2>err &&
+
+ # just grep for our token as the exact error message is likely to
+ # change or be internationalized
+ grep "HEAD:config" err
+'
+
+test_done
--
To unsubscribe from this list: send the line "unsubscribe git" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
