summaryrefslogtreecommitdiff
path: root/builtin/submodule--helper.c
diff options
context:
space:
mode:
authorStefan Beller <sbeller@google.com>2016-04-16 00:50:12 (GMT)
committerJunio C Hamano <gitster@pobox.com>2016-04-17 06:44:01 (GMT)
commit63e95beb085ce8ae359d728ec0a54c3dcfe741f5 (patch)
treefc12b77136c436375119b867f0d24b4e5e50fca9 /builtin/submodule--helper.c
parentee30f17805f51d372ff9c5036f1d142c167e5e34 (diff)
downloadgit-63e95beb085ce8ae359d728ec0a54c3dcfe741f5.zip
git-63e95beb085ce8ae359d728ec0a54c3dcfe741f5.tar.gz
git-63e95beb085ce8ae359d728ec0a54c3dcfe741f5.tar.bz2
submodule: port resolve_relative_url from shell to C
Later on we want to automatically call `git submodule init` from other commands, such that the users don't have to initialize the submodule themselves. As these other commands are written in C already, we'd need the init functionality in C, too. The `resolve_relative_url` function is a large part of that init functionality, so start by porting this function to C. To create the tests in t0060, the function `resolve_relative_url` was temporarily enhanced to write all inputs and output to disk when running the test suite. The added tests in this patch are a small selection thereof. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'builtin/submodule--helper.c')
-rw-r--r--builtin/submodule--helper.c209
1 files changed, 208 insertions, 1 deletions
diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 864dd18..46946b0 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -9,6 +9,211 @@
#include "submodule-config.h"
#include "string-list.h"
#include "run-command.h"
+#include "remote.h"
+#include "refs.h"
+#include "connect.h"
+
+static char *get_default_remote(void)
+{
+ char *dest = NULL, *ret;
+ unsigned char sha1[20];
+ struct strbuf sb = STRBUF_INIT;
+ const char *refname = resolve_ref_unsafe("HEAD", 0, sha1, NULL);
+
+ if (!refname)
+ die(_("No such ref: %s"), "HEAD");
+
+ /* detached HEAD */
+ if (!strcmp(refname, "HEAD"))
+ return xstrdup("origin");
+
+ if (!skip_prefix(refname, "refs/heads/", &refname))
+ die(_("Expecting a full ref name, got %s"), refname);
+
+ strbuf_addf(&sb, "branch.%s.remote", refname);
+ if (git_config_get_string(sb.buf, &dest))
+ ret = xstrdup("origin");
+ else
+ ret = dest;
+
+ strbuf_release(&sb);
+ return ret;
+}
+
+static int starts_with_dot_slash(const char *str)
+{
+ return str[0] == '.' && is_dir_sep(str[1]);
+}
+
+static int starts_with_dot_dot_slash(const char *str)
+{
+ return str[0] == '.' && str[1] == '.' && is_dir_sep(str[2]);
+}
+
+/*
+ * Returns 1 if it was the last chop before ':'.
+ */
+static int chop_last_dir(char **remoteurl, int is_relative)
+{
+ char *rfind = find_last_dir_sep(*remoteurl);
+ if (rfind) {
+ *rfind = '\0';
+ return 0;
+ }
+
+ rfind = strrchr(*remoteurl, ':');
+ if (rfind) {
+ *rfind = '\0';
+ return 1;
+ }
+
+ if (is_relative || !strcmp(".", *remoteurl))
+ die(_("cannot strip one component off url '%s'"),
+ *remoteurl);
+
+ free(*remoteurl);
+ *remoteurl = xstrdup(".");
+ return 0;
+}
+
+/*
+ * The `url` argument is the URL that navigates to the submodule origin
+ * repo. When relative, this URL is relative to the superproject origin
+ * URL repo. The `up_path` argument, if specified, is the relative
+ * path that navigates from the submodule working tree to the superproject
+ * working tree. Returns the origin URL of the submodule.
+ *
+ * Return either an absolute URL or filesystem path (if the superproject
+ * origin URL is an absolute URL or filesystem path, respectively) or a
+ * relative file system path (if the superproject origin URL is a relative
+ * file system path).
+ *
+ * When the output is a relative file system path, the path is either
+ * relative to the submodule working tree, if up_path is specified, or to
+ * the superproject working tree otherwise.
+ *
+ * NEEDSWORK: This works incorrectly on the domain and protocol part.
+ * remote_url url outcome expectation
+ * http://a.com/b ../c http://a.com/c as is
+ * http://a.com/b ../../c http://c error out
+ * http://a.com/b ../../../c http:/c error out
+ * http://a.com/b ../../../../c http:c error out
+ * http://a.com/b ../../../../../c .:c error out
+ * NEEDSWORK: Given how chop_last_dir() works, this function is broken
+ * when a local part has a colon in its path component, too.
+ */
+static char *relative_url(const char *remote_url,
+ const char *url,
+ const char *up_path)
+{
+ int is_relative = 0;
+ int colonsep = 0;
+ char *out;
+ char *remoteurl = xstrdup(remote_url);
+ struct strbuf sb = STRBUF_INIT;
+ size_t len = strlen(remoteurl);
+
+ if (is_dir_sep(remoteurl[len]))
+ remoteurl[len] = '\0';
+
+ if (!url_is_local_not_ssh(remoteurl) || is_absolute_path(remoteurl))
+ is_relative = 0;
+ else {
+ is_relative = 1;
+ /*
+ * Prepend a './' to ensure all relative
+ * remoteurls start with './' or '../'
+ */
+ if (!starts_with_dot_slash(remoteurl) &&
+ !starts_with_dot_dot_slash(remoteurl)) {
+ strbuf_reset(&sb);
+ strbuf_addf(&sb, "./%s", remoteurl);
+ free(remoteurl);
+ remoteurl = strbuf_detach(&sb, NULL);
+ }
+ }
+ /*
+ * When the url starts with '../', remove that and the
+ * last directory in remoteurl.
+ */
+ while (url) {
+ if (starts_with_dot_dot_slash(url)) {
+ url += 3;
+ colonsep |= chop_last_dir(&remoteurl, is_relative);
+ } else if (starts_with_dot_slash(url))
+ url += 2;
+ else
+ break;
+ }
+ strbuf_reset(&sb);
+ strbuf_addf(&sb, "%s%s%s", remoteurl, colonsep ? ":" : "/", url);
+ free(remoteurl);
+
+ if (starts_with_dot_slash(sb.buf))
+ out = xstrdup(sb.buf + 2);
+ else
+ out = xstrdup(sb.buf);
+ strbuf_reset(&sb);
+
+ if (!up_path || !is_relative)
+ return out;
+
+ strbuf_addf(&sb, "%s%s", up_path, out);
+ free(out);
+ return strbuf_detach(&sb, NULL);
+}
+
+static int resolve_relative_url(int argc, const char **argv, const char *prefix)
+{
+ char *remoteurl = NULL;
+ char *remote = get_default_remote();
+ const char *up_path = NULL;
+ char *res;
+ const char *url;
+ struct strbuf sb = STRBUF_INIT;
+
+ if (argc != 2 && argc != 3)
+ die("resolve-relative-url only accepts one or two arguments");
+
+ url = argv[1];
+ strbuf_addf(&sb, "remote.%s.url", remote);
+ free(remote);
+
+ if (git_config_get_string(sb.buf, &remoteurl))
+ /* the repository is its own authoritative upstream */
+ remoteurl = xgetcwd();
+
+ if (argc == 3)
+ up_path = argv[2];
+
+ res = relative_url(remoteurl, url, up_path);
+ puts(res);
+ free(res);
+ free(remoteurl);
+ return 0;
+}
+
+static int resolve_relative_url_test(int argc, const char **argv, const char *prefix)
+{
+ char *remoteurl, *res;
+ const char *up_path, *url;
+
+ if (argc != 4)
+ die("resolve-relative-url-test only accepts three arguments: <up_path> <remoteurl> <url>");
+
+ up_path = argv[1];
+ remoteurl = xstrdup(argv[2]);
+ url = argv[3];
+
+ if (!strcmp(up_path, "(null)"))
+ up_path = NULL;
+
+ res = relative_url(remoteurl, url, up_path);
+ puts(res);
+ free(res);
+ free(remoteurl);
+ return 0;
+}
struct module_list {
const struct cache_entry **entries;
@@ -504,7 +709,9 @@ static struct cmd_struct commands[] = {
{"list", module_list},
{"name", module_name},
{"clone", module_clone},
- {"update-clone", update_clone}
+ {"update-clone", update_clone},
+ {"resolve-relative-url", resolve_relative_url},
+ {"resolve-relative-url-test", resolve_relative_url_test},
};
int cmd_submodule__helper(int argc, const char **argv, const char *prefix)