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-rw-r--r--Documentation/git-config.txt7
-rw-r--r--builtin/config.c31
-rw-r--r--cache.h6
-rw-r--r--config.c217
-rwxr-xr-xt/t1307-config-blob.sh70
5 files changed, 278 insertions, 53 deletions
diff --git a/Documentation/git-config.txt b/Documentation/git-config.txt
index 99dc497b6..34b089464 100644
--- a/Documentation/git-config.txt
+++ b/Documentation/git-config.txt
@@ -127,6 +127,13 @@ See also <<FILES>>.
--file config-file::
Use the given config file instead of the one specified by GIT_CONFIG.
+--blob blob::
+ Similar to '--file' but use the given blob instead of a file. E.g.
+ you can use 'master:.gitmodules' to read values from the file
+ '.gitmodules' in the master branch. See "SPECIFYING REVISIONS"
+ section in linkgit:gitrevisions[7] for a more complete list of
+ ways to spell blob names.
+
--remove-section::
Remove the given section from the configuration file.
diff --git a/builtin/config.c b/builtin/config.c
index 7759671eb..4010c4320 100644
--- a/builtin/config.c
+++ b/builtin/config.c
@@ -21,6 +21,7 @@ static char term = '\n';
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);
@@ -331,7 +335,8 @@ static int get_colorbool(int print)
get_diff_color_found = -1;
get_color_ui_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"))
@@ -353,6 +358,12 @@ 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;
@@ -364,7 +375,8 @@ 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);
}
@@ -443,6 +455,7 @@ 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'",
@@ -455,6 +468,8 @@ 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"),
@@ -462,6 +477,7 @@ 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);
@@ -471,18 +487,21 @@ 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,
@@ -505,6 +524,7 @@ 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,
@@ -514,12 +534,14 @@ 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]);
@@ -530,6 +552,7 @@ 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 48e147f8b..3142b6c37 100644
--- a/cache.h
+++ b/cache.h
@@ -1176,11 +1176,15 @@ extern int update_server_info(int);
typedef int (*config_fn_t)(const char *, const char *, void *);
extern int git_default_config(const char *, const char *, void *);
extern int git_config_from_file(config_fn_t fn, const char *, void *);
+extern int git_config_from_buf(config_fn_t fn, const char *name,
+ const char *buf, size_t len, void *data);
extern void git_config_push_parameter(const char *text);
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 d04e8157a..e13a7b65e 100644
--- a/config.c
+++ b/config.c
@@ -10,20 +10,69 @@
#include "strbuf.h"
#include "quote.h"
-typedef struct config_file {
- struct config_file *prev;
- FILE *f;
+struct config_source {
+ struct config_source *prev;
+ union {
+ FILE *file;
+ struct config_buf {
+ const char *buf;
+ size_t len;
+ size_t pos;
+ } buf;
+ } u;
const char *name;
+ int die_on_error;
int linenr;
int eof;
struct strbuf value;
struct strbuf var;
-} config_file;
-static config_file *cf;
+ int (*fgetc)(struct config_source *c);
+ int (*ungetc)(int c, struct config_source *conf);
+ long (*ftell)(struct config_source *c);
+};
+
+static struct config_source *cf;
static int zlib_compression_seen;
+static int config_file_fgetc(struct config_source *conf)
+{
+ return fgetc(conf->u.file);
+}
+
+static int config_file_ungetc(int c, struct config_source *conf)
+{
+ return ungetc(c, conf->u.file);
+}
+
+static long config_file_ftell(struct config_source *conf)
+{
+ return ftell(conf->u.file);
+}
+
+
+static int config_buf_fgetc(struct config_source *conf)
+{
+ if (conf->u.buf.pos < conf->u.buf.len)
+ return conf->u.buf.buf[conf->u.buf.pos++];
+
+ return EOF;
+}
+
+static int config_buf_ungetc(int c, struct config_source *conf)
+{
+ if (conf->u.buf.pos > 0)
+ return conf->u.buf.buf[--conf->u.buf.pos];
+
+ return EOF;
+}
+
+static long config_buf_ftell(struct config_source *conf)
+{
+ return conf->u.buf.pos;
+}
+
#define MAX_INCLUDE_DEPTH 10
static const char include_depth_advice[] =
"exceeded maximum include depth (%d) while including\n"
@@ -168,27 +217,22 @@ int git_config_from_parameters(config_fn_t fn, void *data)
static int get_next_char(void)
{
- int c;
- FILE *f;
-
- c = '\n';
- if (cf && ((f = cf->f) != NULL)) {
- c = fgetc(f);
- if (c == '\r') {
- /* DOS like systems */
- c = fgetc(f);
- if (c != '\n') {
- ungetc(c, f);
- c = '\r';
- }
- }
- if (c == '\n')
- cf->linenr++;
- if (c == EOF) {
- cf->eof = 1;
- c = '\n';
+ int c = cf->fgetc(cf);
+
+ if (c == '\r') {
+ /* DOS like systems */
+ c = cf->fgetc(cf);
+ if (c != '\n') {
+ cf->ungetc(c, cf);
+ c = '\r';
}
}
+ if (c == '\n')
+ cf->linenr++;
+ if (c == EOF) {
+ cf->eof = 1;
+ c = '\n';
+ }
return c;
}
@@ -339,7 +383,7 @@ static int get_base_var(struct strbuf *name)
}
}
-static int git_parse_file(config_fn_t fn, void *data)
+static int git_parse_source(config_fn_t fn, void *data)
{
int comment = 0;
int baselen = 0;
@@ -399,7 +443,10 @@ static int git_parse_file(config_fn_t fn, void *data)
if (get_value(fn, data, var) < 0)
break;
}
- die("bad config file line %d in %s", cf->linenr, cf->name);
+ if (cf->die_on_error)
+ die("bad config file line %d in %s", cf->linenr, cf->name);
+ else
+ return error("bad config file line %d in %s", cf->linenr, cf->name);
}
static int parse_unit_factor(const char *end, uintmax_t *val)
@@ -906,6 +953,33 @@ int git_default_config(const char *var, const char *value, void *dummy)
return 0;
}
+/*
+ * All source specific fields in the union, die_on_error, name and the callbacks
+ * fgetc, ungetc, ftell of top need to be initialized before calling
+ * this function.
+ */
+static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
+{
+ int ret;
+
+ /* push config-file parsing state stack */
+ top->prev = cf;
+ top->linenr = 1;
+ top->eof = 0;
+ strbuf_init(&top->value, 1024);
+ strbuf_init(&top->var, 1024);
+ cf = top;
+
+ ret = git_parse_source(fn, data);
+
+ /* pop config-file parsing state stack */
+ strbuf_release(&top->value);
+ strbuf_release(&top->var);
+ cf = top->prev;
+
+ return ret;
+}
+
int git_config_from_file(config_fn_t fn, const char *filename, void *data)
{
int ret;
@@ -913,30 +987,74 @@ int git_config_from_file(config_fn_t fn, const char *filename, void *data)
ret = -1;
if (f) {
- config_file top;
+ struct config_source top;
- /* push config-file parsing state stack */
- top.prev = cf;
- top.f = f;
+ top.u.file = f;
top.name = filename;
- top.linenr = 1;
- top.eof = 0;
- strbuf_init(&top.value, 1024);
- strbuf_init(&top.var, 1024);
- cf = &top;
-
- ret = git_parse_file(fn, data);
+ top.die_on_error = 1;
+ top.fgetc = config_file_fgetc;
+ top.ungetc = config_file_ungetc;
+ top.ftell = config_file_ftell;
- /* pop config-file parsing state stack */
- strbuf_release(&top.value);
- strbuf_release(&top.var);
- cf = top.prev;
+ ret = do_config_from(&top, fn, data);
fclose(f);
}
return ret;
}
+int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
+ size_t len, void *data)
+{
+ struct config_source top;
+
+ top.u.buf.buf = buf;
+ top.u.buf.len = len;
+ top.u.buf.pos = 0;
+ top.name = name;
+ top.die_on_error = 0;
+ top.fgetc = config_buf_fgetc;
+ top.ungetc = config_buf_ungetc;
+ top.ftell = config_buf_ftell;
+
+ return do_config_from(&top, fn, data);
+}
+
+static int git_config_from_blob_sha1(config_fn_t fn,
+ const char *name,
+ const unsigned char *sha1,
+ void *data)
+{
+ enum object_type type;
+ char *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);
+ }
+
+ ret = git_config_from_buf(fn, name, buf, size, data);
+ free(buf);
+
+ 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;
@@ -1002,7 +1120,9 @@ int git_config_early(config_fn_t fn, void *data, const char *repo_config)
}
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;
@@ -1021,6 +1141,8 @@ 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);
@@ -1031,7 +1153,7 @@ int git_config_with_options(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);
}
/*
@@ -1063,7 +1185,6 @@ static int store_aux(const char *key, const char *value, void *cb)
{
const char *ep;
size_t section_len;
- FILE *f = cf->f;
switch (store.state) {
case KEY_SEEN:
@@ -1075,7 +1196,7 @@ static int store_aux(const char *key, const char *value, void *cb)
return 1;
}
- store.offset[store.seen] = ftell(f);
+ store.offset[store.seen] = cf->ftell(cf);
store.seen++;
}
break;
@@ -1102,19 +1223,19 @@ static int store_aux(const char *key, const char *value, void *cb)
* Do not increment matches: this is no match, but we
* just made sure we are in the desired section.
*/
- store.offset[store.seen] = ftell(f);
+ store.offset[store.seen] = cf->ftell(cf);
/* fallthru */
case SECTION_END_SEEN:
case START:
if (matches(key, value)) {
- store.offset[store.seen] = ftell(f);
+ store.offset[store.seen] = cf->ftell(cf);
store.state = KEY_SEEN;
store.seen++;
} else {
if (strrchr(key, '.') - key == store.baselen &&
!strncmp(key, store.key, store.baselen)) {
store.state = SECTION_SEEN;
- store.offset[store.seen] = ftell(f);
+ store.offset[store.seen] = cf->ftell(cf);
}
}
}
diff --git a/t/t1307-config-blob.sh b/t/t1307-config-blob.sh
new file mode 100755
index 000000000..fdc257e66
--- /dev/null
+++ b/t/t1307-config-blob.sh
@@ -0,0 +1,70 @@
+#!/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 non-existing value from blob is an error' '
+ test_must_fail git config --blob=HEAD:config non.existing
+'
+
+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