From: Ferry Huberts <[email protected]> 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 <[email protected]> --- 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 _______________________________________________ cgit mailing list [email protected] http://hjemli.net/mailman/listinfo/cgit
