[RFC PATCH 2/2] cgit.c: add 'clone-url' setting with support for macro expansion

larsh at hjemli.net larsh at hjemli.net
Tue Jun 7 00:37:23 CEST 2011

From: Lars Hjemli <hjemli at gmail.com>

The current 'clone-prefix' setting has some known issues:
* All repos get the same 'clone-prefix' value since the setting is not
  adopted during repo registration (in cgitrc, or during scan-path traversal),
  but only when the setting is used.
* The generated clone-urls for a repo is a combination of 'clone-prefix', a
  slash and the repo url. This doesn't work well with e.g. ssh-style urls
  like 'git at example.org:repo.git', since the inserted slash will make the
  repo relative to the filesystem root.
* If 'remove-suffix' is enabled, the generated clone-urls will not work for
  cloning (except for http-urls to cgit itself) since they miss the '.git'

The new 'clone-url' setting is designed to avoid the mentioned issues:
* Each repo adopts the default 'clone-url' when the repo is defined. This
  allows different groups of repos to adopt different values.
* The clone-urls for a repo is generated by expanding environment variables
  in a string template without inserting arbitrary characters, hence any
  kind of clone-url can be generated.
* Macro expansion also eases the 'remove-suffix' pain since it's now
  possible to define e.g. 'clone-url=git://foo.org/$CGIT_REPO_URL.git' for
  a set of repos. A furter improvement would be to define e.g.
  $CGIT_REPO_SUFFIX to '.git' for all repos which had their url prettified,
  or to store the original $CGIT_REPO_URL in e.g. $CGIT_REPO_REAL_URL before
  suffix removal.

While at it, cgitrc.5 is expanded with a section describing the (previously
undocumented) macro expansion feature.

Signed-off-by: Lars Hjemli <hjemli at gmail.com>
 cgit.c                 |    2 ++
 cgit.h                 |    1 +
 cgitrc.5.txt           |   32 ++++++++++++++++++++++++++++++--
 shared.c               |    1 +
 tests/setup.sh         |    1 +
 tests/t0102-summary.sh |    6 ++++++
 ui-summary.c           |    2 +-
 7 files changed, 42 insertions(+), 3 deletions(-)

diff --git a/cgit.c b/cgit.c
index dd40893..51ca78a 100644
--- a/cgit.c
+++ b/cgit.c
@@ -244,6 +244,8 @@ void config_cb(const char *name, const char *value)
 		ctx.cfg.robots = xstrdup(value);
 	else if (!strcmp(name, "clone-prefix"))
 		ctx.cfg.clone_prefix = xstrdup(value);
+	else if (!strcmp(name, "clone-url"))
+		ctx.cfg.clone_url = xstrdup(value);
 	else if (!strcmp(name, "local-time"))
 		ctx.cfg.local_time = atoi(value);
 	else if (!prefixcmp(name, "mimetype."))
diff --git a/cgit.h b/cgit.h
index df7ee5d..bad66f0 100644
--- a/cgit.h
+++ b/cgit.h
@@ -165,6 +165,7 @@ struct cgit_config {
 	char *agefile;
 	char *cache_root;
 	char *clone_prefix;
+	char *clone_url;
 	char *css;
 	char *favicon;
 	char *footer;
diff --git a/cgitrc.5.txt b/cgitrc.5.txt
index 5903a93..c2d2fad 100644
--- a/cgitrc.5.txt
+++ b/cgitrc.5.txt
@@ -76,6 +76,11 @@ clone-prefix::
 	setting is only used if `repo.clone-url` is unspecified. Default value:
+	Space-separated list of clone-url templates. This setting is only
+	used if `repo.clone-url` is unspecified. Default value: none. See
 	Specifies a command which will be invoked to format commit messages.
 	The command will get the message on its STDIN, and the STDOUT from the
@@ -492,6 +497,29 @@ allocated buffer within cgit then only the environment variables that fit
 in the allocated buffer are handed to the filter.
+Certain cgitrc settings supports a simple macro expansion feature, where
+tokens prefixed with '$' are replaced with the value of the environment
+variable named by the token[*]. The settings which supports this feature are
+divided in two groups:
+* Settings expanded prior to request processing. These settings are typically
+used to implement virtual hosting based on environment variables set by the
+web-server (e.g. HTTP_HOST):
+  - CGIT_CONFIG (not really a cgitrc setting...)
+  - cache-root
+  - project-list
+  - scan-path
+  - include
+* Settings expanded during request processing. These settings will typically
+also support the environment variables defined in "FILTER API":
+  - clone-url
+  - repo.clone-url
+[*] A token is a sequence of alphanumeric characters and underscores.
@@ -500,8 +528,8 @@ EXAMPLE CGITRC FILE
-# Specify some default clone prefixes
-clone-prefix=git://example.com ssh://example.com/pub/git http://example.com/git
+# Specify some default clone urls using macro expansion
+clone-url=git://example.com/$CGIT_REPO_URL.git ssh://example.com/pub/git/$CGIT_REPO_URL.git
 # Specify the css url
diff --git a/shared.c b/shared.c
index 4adeaa8..699c362 100644
--- a/shared.c
+++ b/shared.c
@@ -70,6 +70,7 @@ struct cgit_repo *cgit_add_repo(const char *url)
 	ret->about_filter = ctx.cfg.about_filter;
 	ret->commit_filter = ctx.cfg.commit_filter;
 	ret->source_filter = ctx.cfg.source_filter;
+	ret->clone_url = ctx.cfg.clone_url;
 	return ret;
diff --git a/tests/setup.sh b/tests/setup.sh
index b2f1169..1e06107 100755
--- a/tests/setup.sh
+++ b/tests/setup.sh
@@ -62,6 +62,7 @@ enable-log-linecount=1
diff --git a/tests/t0102-summary.sh b/tests/t0102-summary.sh
index f0b0d9a..f299c5a 100755
--- a/tests/t0102-summary.sh
+++ b/tests/t0102-summary.sh
@@ -9,6 +9,9 @@ run_test 'find commit 1' 'grep -e "commit 1" trash/tmp'
 run_test 'find commit 5' 'grep -e "commit 5" trash/tmp'
 run_test 'find branch master' 'grep -e "master" trash/tmp'
 run_test 'no tags' '! grep -e "tags" trash/tmp'
+run_test 'clone-url expanded correctly' '
+	grep -e "git://example.org/foo.git" trash/tmp
 run_test 'generate bar summary' 'cgit_url "bar" >trash/tmp'
 run_test 'no commit 45' '! grep -e "commit 45" trash/tmp'
@@ -16,5 +19,8 @@ run_test 'find commit 46' 'grep -e "commit 46" trash/tmp'
 run_test 'find commit 50' 'grep -e "commit 50" trash/tmp'
 run_test 'find branch master' 'grep -e "master" trash/tmp'
 run_test 'no tags' '! grep -e "tags" trash/tmp'
+run_test 'clone-url expanded correctly' '
+	grep -e "git://example.org/bar.git" trash/tmp
diff --git a/ui-summary.c b/ui-summary.c
index 5be2545..227ed27 100644
--- a/ui-summary.c
+++ b/ui-summary.c
@@ -62,7 +62,7 @@ void cgit_print_summary()
 			       NULL, NULL, 0, 0);
 	if (ctx.repo->clone_url)
-		print_urls(ctx.repo->clone_url, NULL);
+		print_urls(expand_macros(ctx.repo->clone_url), NULL);
 	else if (ctx.cfg.clone_prefix)
 		print_urls(ctx.cfg.clone_prefix, ctx.repo->url);

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