[PATCH] submodule: Port resolve_relative_url from shell to C
- From
Stefan Beller <sbeller@google.com>
- Date
- Dec 10, 2015, 01:07 UTC
- Message-ID
- <1449709654-30189-1-git-send-email-sbeller@google.com>
This reimplements the helper function `resolve_relative_url` in shell in C. This functionality is needed in C for introducing the groups feature later on. When using groups, the user should not need to run `git submodule init`, but it should be implicit at all appropriate places, which are all in C code. As the we would not just call out to `git submodule init`, but do a more fine grained structure there, we actually need all the init functionality in C before attempting the groups feature. To get the init functionality in C, rewriting the resolve_relative_url subfunction is a major step.
This also improves the performance: (Best out of 3) time ./t7400-submodule-basic.sh Before: real 0m9.575s user 0m2.683s sys 0m6.773s After: real 0m9.293s user 0m2.691s sys 0m6.549s
Signed-off-by: Stefan Beller <sbeller@google.com> ---
This applies on origin/master, and I'd carry as its own feature branch as I am nowhere near done with the groups feature after reading Jens feedback. (It took me a while to identify this as a next best step.) Thanks, Stefan
builtin/submodule--helper.c | 120 ++++++++++++++++++++++++++++++++++++++++++++ git-submodule.sh | 81 ++---------------------------- 2 files changed, 124 insertions(+), 77 deletions(-)
diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c index f4c3eff..f48b5b5 100644 --- a/builtin/submodule--helper.c +++ b/builtin/submodule--helper.c @@ -9,6 +9,125 @@ #include "submodule-config.h" #include "string-list.h" #include "run-command.h" +#include "remote.h" +#include "refs.h" + +static const char *get_default_remote(void) +{ + char *dest = NULL; + unsigned char sha1[20]; + int flag; + struct strbuf sb = STRBUF_INIT; + const char *refname = resolve_ref_unsafe("HEAD", 0, sha1, &flag); + + if (!refname) + die("No such ref: HEAD"); + + refname = shorten_unambiguous_ref(refname, 0); + strbuf_addf(&sb, "branch.%s.remote", refname); + if (git_config_get_string(sb.buf, &dest)) + return "origin"; + else + return xstrdup(dest); +} + +/* + * The function takes at most 2 arguments. The first argument is the + * URL that navigates to the submodule origin repo. When relative, this URL + * is relative to the superproject origin URL repo. The second up_path + * argument, if specified, is the relative path that navigates + * from the submodule working tree to the superproject working tree. + * + * The output of the function is the origin URL of the submodule. + * + * The output will either be 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. + */ +static const char *relative_url(const char *url, const char *up_path) +{ + int is_relative = 0; + size_t len; + char *remoteurl = NULL; + char *sep = "/"; + const char *out; + struct strbuf sb = STRBUF_INIT; + const char *remote = get_default_remote(); + strbuf_addf(&sb, "remote.%s.url", remote); + + if (git_config_get_string(sb.buf, &remoteurl)) + /* the repository is its own authoritative upstream */ + remoteurl = xgetcwd(); + + if (strip_suffix(remoteurl, "/", &len)) + remoteurl[len] = '\0'; + + if (strchr(remoteurl, ':') || skip_prefix(remoteurl, "/", &out)) + is_relative = 0; + else if (skip_prefix(remoteurl, "./", &out) || + skip_prefix(remoteurl, "../", &out)) + is_relative = 1; + else { + is_relative = 1; + strbuf_reset(&sb); + strbuf_addf(&sb, "./%s", remoteurl); + remoteurl = strbuf_detach(&sb, NULL); + } + + while (url) { + if (skip_prefix(url, "../", &out)) { + char *rfind; + url = out; + + rfind = strrchr(remoteurl, '/'); + if (rfind) + *rfind = '\0'; + else { + rfind = strrchr(remoteurl, ':'); + if (rfind) { + *rfind = '\0'; + sep = ":"; + } else { + if (is_relative || !strcmp(".", remoteurl)) + die(N_("cannot strip one component off url '%s'"), remoteurl); + else + remoteurl = "."; + } + } + } else if (skip_prefix(url, "./", &out)) + url = out; + else + break; + } + strbuf_reset(&sb); + strbuf_addf(&sb, "%s%s%s", remoteurl, sep, url); + + if (!skip_prefix(sb.buf, "./", &out)) + out = sb.buf; + out = xstrdup(out); + + strbuf_reset(&sb); + strbuf_addf(&sb, "%s%s", is_relative && up_path ? up_path : "", out); + + free((char*)out); + return strbuf_detach(&sb, NULL); +} + +static int resolve_relative_url(int argc, const char **argv, const char *prefix) +{ + if (argc == 2) + printf("%s\n", relative_url(argv[1], NULL)); + else if (argc == 3) + printf("%s\n", relative_url(argv[1], argv[2])); + else + die("BUG: resolve_relative_url only accepts one or two arguments"); + return 0; +} struct module_list { const struct cache_entry **entries; @@ -264,6 +383,7 @@ static struct cmd_struct commands[] = { {"list", module_list}, {"name", module_name}, {"clone", module_clone}, + {"resolve_relative_url", resolve_relative_url}, }; int cmd_submodule__helper(int argc, const char **argv, const char *prefix) diff --git a/git-submodule.sh b/git-submodule.sh index 9bc5c5f..6a7a3e4 100755 --- a/git-submodule.sh +++ b/git-submodule.sh @@ -46,79 +46,6 @@ prefix= custom_name= depth= -# The function takes at most 2 arguments. The first argument is the -# URL that navigates to the submodule origin repo. When relative, this URL -# is relative to the superproject origin URL repo. The second up_path -# argument, if specified, is the relative path that navigates -# from the submodule working tree to the superproject working tree. -# -# The output of the function is the origin URL of the submodule. -# -# The output will either be 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. -resolve_relative_url () -{ - remote=$(get_default_remote) - remoteurl=$(git config "remote.$remote.url") || - remoteurl=$(pwd) # the repository is its own authoritative upstream - url="$1" - remoteurl=${remoteurl%/} - sep=/ - up_path="$2" - - case "$remoteurl" in - *:*|/*) - is_relative= - ;; - ./*|../*) - is_relative=t - ;; - *) - is_relative=t - remoteurl="./$remoteurl" - ;; - esac - - while test -n "$url" - do - case "$url" in - ../*) - url="${url#../}" - case "$remoteurl" in - */*) - remoteurl="${remoteurl%/*}" - ;; - *:*) - remoteurl="${remoteurl%:*}" - sep=: - ;; - *) - if test -z "$is_relative" || test "." = "$remoteurl" - then - die "$(eval_gettext "cannot strip one component off url '\$remoteurl'")" - else - remoteurl=. - fi - ;; - esac - ;; - ./*) - url="${url#./}" - ;; - *) - break;; - esac - done - remoteurl="$remoteurl$sep${url%/}" - echo "${is_relative:+${up_path}}${remoteurl#./}" -} - # Resolve a path to be relative to another path. This is intended for # converting submodule paths when git-submodule is run in a subdirectory # and only handles paths where the directory separator is '/'. @@ -281,7 +208,7 @@ cmd_add() die "$(gettext "Relative path can only be used from the toplevel of the working tree")" # dereference source url relative to parent's url - realrepo=$(resolve_relative_url "$repo") || exit + realrepo=$(git submodule--helper resolve_relative_url "$repo") || exit ;; *:*|/*) # absolute url @@ -485,7 +412,7 @@ cmd_init() # Possibly a url relative to parent case "$url" in ./*|../*) - url=$(resolve_relative_url "$url") || exit + url=$(git submodule--helper resolve_relative_url "$url") || exit ;; esac git config submodule."$name".url "$url" || @@ -1190,9 +1117,9 @@ cmd_sync() # guarantee a trailing / up_path=${up_path%/}/ && # path from submodule work tree to submodule origin repo - sub_origin_url=$(resolve_relative_url "$url" "$up_path") && + sub_origin_url=$(git submodule--helper resolve_relative_url "$url" "$up_path") && # path from superproject work tree to submodule origin repo - super_config_url=$(resolve_relative_url "$url") || exit + super_config_url=$(git submodule--helper resolve_relative_url "$url") || exit ;; *) sub_origin_url="$url"
-- 2.6.3.470.g4b82c23.dirty