[PATCH v4 3/5] cgit_open_filter: hand down repo configuration to script
Ferry Huberts
mailings at hupie.com
Wed Mar 23 11:57:43 CET 2011
From: Ferry Huberts <ferry.huberts at pelagic.nl>
The environment variables can be used to (for example) resolve
the following situation:
Suppose a server setup in which each repository has a trac
instance; the commit filter needs to know with which
repository it's dealing in order to be able to resolve the
#123 ticket numbers in the commit messages into hyperlinks
into the correct trac instance.
Signed-off-by: Ferry Huberts <ferry.huberts at pelagic.nl>
---
shared.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 77 insertions(+), 1 deletions(-)
diff --git a/shared.c b/shared.c
index e4879df..8c3d18a 100644
--- a/shared.c
+++ b/shared.c
@@ -7,6 +7,8 @@
*/
#include "cgit.h"
+#include <stdio.h>
+#include <linux/limits.h>
struct cgit_repolist cgit_repolist;
struct cgit_context ctx;
@@ -376,6 +378,70 @@ int cgit_parse_snapshots_mask(const char *str)
return rv;
}
+typedef struct {
+ char * name;
+ char * value;
+} cgit_env_var;
+
+static char * prepare_env(struct cgit_repo * repo) {
+ cgit_env_var env_vars[] = {
+ { .name = "CGIT_REPO_URL", .value = repo->url },
+ { .name = "CGIT_REPO_NAME", .value = repo->name },
+ { .name = "CGIT_REPO_PATH", .value = repo->path },
+ { .name = "CGIT_REPO_OWNER", .value = repo->owner },
+ { .name = "CGIT_REPO_DEFBRANCH", .value = repo->defbranch },
+ { .name = "CGIT_REPO_SECTION", .value = repo->section },
+ { .name = "CGIT_REPO_CLONE_URL", .value = repo->clone_url }
+ };
+ int env_var_count = ARRAY_SIZE(env_vars);
+ long values_space = (env_var_count * (PATH_MAX + 64));
+
+ void * buffer;
+ char ** vars;
+ char * values;
+ int vars_index = 0;
+ unsigned int chars_printed;
+
+ /* Allocate buffer for environment variables: first in the buffer is an
+ * array of pointers to argument strings, terminated with a NULL pointer.
+ * After that the argument strings are placed after each other */
+ buffer = malloc(((env_var_count + 1) * sizeof(char *)) + values_space);
+ if (!buffer)
+ return NULL;
+
+ vars = buffer;
+ values = (char *) &vars[env_var_count + 1];
+
+ /* loop over all defined environment variables and their values */
+ while (vars_index < env_var_count) {
+ char * name = env_vars[vars_index].name;
+ char * value = env_vars[vars_index].value;
+
+ if (!value)
+ value = "";
+
+ chars_printed = snprintf(values, (values_space - 1), "%s=%s", name,
+ value);
+ if (chars_printed > (values_space - 1)) {
+ /* Buffer space exhausted: stop adding variables.
+ * Not all environment variables are defined, but the best we can
+ * do is to provide the ones that _are_ defined */
+ break;
+ }
+
+ values[chars_printed] = '\0';
+ *&vars[vars_index] = values;
+ values += (chars_printed + 1);
+ values_space -= (chars_printed + 1);
+ vars_index++;
+ }
+
+ /* terminate the array with pointers */
+ *&vars[vars_index] = NULL;
+
+ return (char *) buffer;
+}
+
int cgit_open_filter(struct cgit_filter *filter, struct cgit_repo * repo)
{
@@ -384,10 +450,20 @@ int cgit_open_filter(struct cgit_filter *filter, struct cgit_repo * repo)
chk_zero(pipe(filter->pipe_fh), "Unable to create pipe to subprocess");
filter->pid = chk_non_negative(fork(), "Unable to create subprocess");
if (filter->pid == 0) {
+ char * env = NULL;
+
close(filter->pipe_fh[1]);
chk_non_negative(dup2(filter->pipe_fh[0], STDIN_FILENO),
"Unable to use pipe as STDIN");
- execvp(filter->cmd, filter->argv);
+
+ if (repo)
+ env = prepare_env(repo);
+
+ execve(filter->cmd, filter->argv, (char **)env);
+
+ if (env)
+ free(env);
+
die("Unable to exec subprocess %s: %s (%d)", filter->cmd,
strerror(errno), errno);
}
--
1.7.4
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