We allow the user to relocate certain paths out of $GIT_DIR via
environment variables, e.g. GIT_OBJECT_DIRECTORY, GIT_INDEX_FILE and
GIT_GRAFT_FILE. Callers are not supposed to use git_path() or
git_pathdup() to get those paths. Instead they must use
get_object_directory(), get_index_file() and get_graft_file()
respectively. This is inconvenient and could be missed in review (for
example, there's git_path("objects/info/alternates") somewhere in
sha1_file.c).
This patch makes git_path() and git_pathdup() understand those
environment variables. So if you set GIT_OBJECT_DIRECTORY to /foo/bar,
git_path("objects/abc") should return /foo/bar/abc. The same is done
for the two remaining env variables.
"git rev-parse --git-path" is the wrapper for script use.
This patch kinda reverts a0279e1 (setup_git_env: use git_pathdup
instead of xmalloc + sprintf - 2014-06-19) because using git_pathdup
here would result in infinite recursion:
setup_git_env() -> git_pathdup("objects") -> .. -> adjust_git_path()
-> get_object_directory() -> oops, git_object_directory is NOT set
yet -> setup_git_env()
I wanted to make git_pathdup_literal() that skips adjust_git_path().
But that won't work because later on when $GIT_COMMON_DIR is
introduced, git_pathdup_literal("objects") needs adjust_git_path() to
replace $GIT_DIR with $GIT_COMMON_DIR.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
Documentation/git-rev-parse.txt | 7 ++++++
builtin/rev-parse.c | 7 ++++++
cache.h | 1 +
environment.c | 19 +++++++++++-----
path.c | 49 +++++++++++++++++++++++++++++++++++++++--
t/t0060-path-utils.sh | 19 ++++++++++++++++
6 files changed, 95 insertions(+), 7 deletions(-)
diff --git a/Documentation/git-rev-parse.txt b/Documentation/git-rev-parse.txt
index d6de42f..2103bbf 100644
--- a/Documentation/git-rev-parse.txt
+++ b/Documentation/git-rev-parse.txt
@@ -233,6 +233,13 @@ print a message to stderr and exit with nonzero status.
repository. If <path> is a gitfile then the resolved path
to the real repository is printed.
+--git-path <path>::
+ Resolve "$GIT_DIR/<path>" and takes other path relocation
+ variables such as $GIT_OBJECT_DIRECTORY,
+ $GIT_INDEX_FILE... into account. For example, if
+ $GIT_OBJECT_DIRECTORY is set to /foo/bar then "git rev-parse
+ --git-path objects/abc" returns /foo/bar/abc.
+
--show-cdup::
When the command is invoked from a subdirectory, show the
path of the top-level directory relative to the current
diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index 35d3c43..4cd44aa 100644
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -533,6 +533,13 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
+ if (!strcmp(arg, "--git-path")) {
+ if (!argv[i + 1])
+ die("--git-path requires an argument");
+ puts(git_path("%s", argv[i + 1]));
+ i++;
+ continue;
+ }
if (as_is) {
if (show_file(arg, output_prefix) && as_is < 2)
verify_filename(prefix, arg, 0);
diff --git a/cache.h b/cache.h
index 56643cf..7da2ffb 100644
--- a/cache.h
+++ b/cache.h
@@ -617,6 +617,7 @@ extern int fsync_object_files;
extern int core_preload_index;
extern int core_apply_sparse_checkout;
extern int precomposed_unicode;
+extern int git_db_env, git_index_env, git_graft_env;
/*
* The character that begins a commented line in user-editable file
diff --git a/environment.c b/environment.c
index 565f652..fee12a6 100644
--- a/environment.c
+++ b/environment.c
@@ -83,6 +83,7 @@ static size_t namespace_len;
static const char *git_dir;
static char *git_object_dir, *git_index_file, *git_graft_file;
+int git_db_env, git_index_env, git_graft_env;
/*
* Repository-local GIT_* environment variables; see cache.h for details.
@@ -124,10 +125,18 @@ static char *expand_namespace(const char *raw_namespace)
return strbuf_detach(&buf, NULL);
}
-static char *git_path_from_env(const char *envvar, const char *path)
+static char *git_path_from_env(const char *envvar, const char *path,
+ int *fromenv)
{
const char *value = getenv(envvar);
- return value ? xstrdup(value) : git_pathdup("%s", path);
+ if (!value) {
+ char *buf = xmalloc(strlen(git_dir) + strlen(path) + 2);
+ sprintf(buf, "%s/%s", git_dir, path);
+ return buf;
+ }
+ if (fromenv)
+ *fromenv = 1;
+ return xstrdup(value);
}
static void setup_git_env(void)
@@ -140,9 +149,9 @@ static void setup_git_env(void)
git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
gitfile = read_gitfile(git_dir);
git_dir = xstrdup(gitfile ? gitfile : git_dir);
- git_object_dir = git_path_from_env(DB_ENVIRONMENT, "objects");
- git_index_file = git_path_from_env(INDEX_ENVIRONMENT, "index");
- git_graft_file = git_path_from_env(GRAFT_ENVIRONMENT, "info/grafts");
+ git_object_dir = git_path_from_env(DB_ENVIRONMENT, "objects", &git_db_env);
+ git_index_file = git_path_from_env(INDEX_ENVIRONMENT, "index", &git_index_env);
+ git_graft_file = git_path_from_env(GRAFT_ENVIRONMENT, "info/grafts", &git_graft_env);
if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
check_replace_refs = 0;
namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
diff --git a/path.c b/path.c
index df0f75b..4910783 100644
--- a/path.c
+++ b/path.c
@@ -60,13 +60,58 @@ char *mksnpath(char *buf, size_t n, const char *fmt, ...)
return cleanup_path(buf);
}
+static int dir_prefix(const char *buf, const char *dir)
+{
+ int len = strlen(dir);
+ return !strncmp(buf, dir, len) &&
+ (is_dir_sep(buf[len]) || buf[len] == '\0');
+}
+
+/* $buf =~ m|$dir/+$file| but without regex */
+static int is_dir_file(const char *buf, const char *dir, const char *file)
+{
+ int len = strlen(dir);
+ if (strncmp(buf, dir, len) || !is_dir_sep(buf[len]))
+ return 0;
+ while (is_dir_sep(buf[len]))
+ len++;
+ return !strcmp(buf + len, file);
+}
+
+static void replace_dir(struct strbuf *buf, int len, const char *newdir)
+{
+ int newlen = strlen(newdir);
+ int need_sep = (buf->buf[len] && !is_dir_sep(buf->buf[len])) &&
+ !is_dir_sep(newdir[newlen - 1]);
+ if (need_sep)
+ len--; /* keep one char, to be replaced with '/' */
+ strbuf_splice(buf, 0, len, newdir, newlen);
+ if (need_sep)
+ buf->buf[newlen] = '/';
+}
+
+static void adjust_git_path(struct strbuf *buf, int git_dir_len)
+{
+ const char *base = buf->buf + git_dir_len;
+ if (git_graft_env && is_dir_file(base, "info", "grafts"))
+ strbuf_splice(buf, 0, buf->len,
+ get_graft_file(), strlen(get_graft_file()));
+ else if (git_index_env && !strcmp(base, "index"))
+ strbuf_splice(buf, 0, buf->len,
+ get_index_file(), strlen(get_index_file()));
+ else if (git_db_env && dir_prefix(base, "objects"))
+ replace_dir(buf, git_dir_len + 7, get_object_directory());
+}
+
static void do_git_path(struct strbuf *buf, const char *fmt, va_list args)
{
- const char *git_dir = get_git_dir();
- strbuf_addstr(buf, git_dir);
+ int gitdir_len;
+ strbuf_addstr(buf, get_git_dir());
if (buf->len && !is_dir_sep(buf->buf[buf->len - 1]))
strbuf_addch(buf, '/');
+ gitdir_len = buf->len;
strbuf_vaddf(buf, fmt, args);
+ adjust_git_path(buf, gitdir_len);
strbuf_cleanup_path(buf);
}
diff --git a/t/t0060-path-utils.sh b/t/t0060-path-utils.sh
index c0143a0..33d2818 100755
--- a/t/t0060-path-utils.sh
+++ b/t/t0060-path-utils.sh
@@ -19,6 +19,14 @@ relative_path() {
"test \"\$(test-path-utils relative_path '$1' '$2')\" = '$expected'"
}
+test_git_path() {
+ test_expect_success "git-path $1 $2 => $3" "
+ $1 git rev-parse --git-path $2 >actual &&
+ echo $3 >expect &&
+ test_cmp expect actual
+ "
+}
+
# On Windows, we are using MSYS's bash, which mangles the paths.
# Absolute paths are anchored at the MSYS installation directory,
# which means that the path / accounts for this many characters:
@@ -244,4 +252,15 @@ relative_path "<null>" "<empty>" ./
relative_path "<null>" "<null>" ./
relative_path "<null>" /foo/a/b ./
+test_git_path A=B info/grafts .git/info/grafts
+test_git_path GIT_GRAFT_FILE=foo info/grafts foo
+test_git_path GIT_GRAFT_FILE=foo info/////grafts foo
+test_git_path GIT_INDEX_FILE=foo index foo
+test_git_path GIT_INDEX_FILE=foo index/foo .git/index/foo
+test_git_path GIT_INDEX_FILE=foo index2 .git/index2
+test_expect_success 'setup fake objects directory foo' 'mkdir foo'
+test_git_path GIT_OBJECT_DIRECTORY=foo objects foo
+test_git_path GIT_OBJECT_DIRECTORY=foo objects/foo foo/foo
+test_git_path GIT_OBJECT_DIRECTORY=foo objects2 .git/objects2
+
test_done
--
2.1.0.rc0.78.gc0d8480
--
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