diff options
| -rw-r--r-- | README | 8 | ||||
| -rw-r--r-- | src/satd.c | 56 |
2 files changed, 63 insertions, 1 deletions
@@ -44,6 +44,14 @@ ENVIRONMENT interprocess communication related files are stored. If unset or empty, /run is used. + SAT_HOOK_PATH + The pathname of the hook script to use. Does not have to + already exist. If not defined, $XDG_CONFIG_HOME/sat/hook + (if XDG_CONFIG_HOME is defined), $HOME/.config/sat/hook + (if HOME is defined), ~/.config/sat/hook (if the user has + a home and is not root), or /etc/sat/hook (otherwise) is + used. + SEE ALSO at(1), cron(1), sleep-until(1) @@ -21,6 +21,7 @@ */ #include <unistd.h> #include <errno.h> +#include <pwd.h> #include <sys/stat.h> #include <sys/socket.h> #include <sys/un.h> @@ -109,6 +110,47 @@ fail: /** + * Construct the pathname for the hook script. + * + * @param env The environment variable to use for the beginning + * of the pathname, `NULL` for the home directory. + * @param suffix The rest of the pathname. + * @return The pathname. + * + * @throws 0 The environment variable is not set, or, if `env` is + * `NULL` the user is root or homeless. + */ +static char * +hookpath(const char *env, const char *suffix) +{ + const char *prefix = NULL; + char *path; + struct passwd *pwd; + + if (!env) { + if (!getuid()) + goto try_next; + pwd = getpwuid(getuid()); + prefix = pwd ? pwd->pw_dir : NULL; + } else { + prefix = getenv(env); + } + if (!prefix || !*prefix) + goto try_next; + + path = malloc((strlen(prefix) + strlen(suffix) + 1) * sizeof(char)); + t (!path); + stpcpy(stpcpy(path, prefix), suffix); + + return path; +fail: + return NULL; +try_next: + return errno = 0, NULL; +} + + +/** * The sat daemon. * * @param argc Any value in [0, 2] is accepted. @@ -169,7 +211,19 @@ main(int argc, char *argv[]) } /* Get hook-script pathname. */ - /* TODO */ + if (!getenv("SAT_HOOK_PATH")) { + int do_not_free = 0; + path = hookpath("XDG_CONFIG_HOME", "/sat/hook"); + t (!path && errno); + path = path ? path : hookpath("HOME", "/.config/sat/hook"); + t (!path && errno); + path = path ? path : hookpath(NULL, "/.config/sat/hook"); + t (!path && errno); + path = path ? path : (do_not_free = 1, "/etc/sat/hook"); + t (setenv("SAT_HOOK_PATH", path, 1)); + if (!do_not_free) + free(path); + } /* Listen for incoming conections. */ #if SOMAXCONN < SATD_BACKLOG |