| 1 | /* Copyright (C) 2018 Thomas Balzer */ |
| 2 | |
| 3 | /* This file is part of tomd. */ |
| 4 | |
| 5 | /* tomd is free software: you can redistribute it and/or modify */ |
| 6 | /* it under the terms of the GNU General Public License as published by */ |
| 7 | /* the Free Software Foundation, either version 3 of the License, or */ |
| 8 | /* (at your option) any later version. */ |
| 9 | |
| 10 | /* tomd is distributed in the hope that it will be useful, */ |
| 11 | /* but WITHOUT ANY WARRANTY; without even the implied warranty of */ |
| 12 | /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ |
| 13 | /* GNU General Public License for more details. */ |
| 14 | |
| 15 | /* You should have received a copy of the GNU General Public License */ |
| 16 | /* along with tomd. If not, see <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #include <libguile.h> |
| 19 | #include <pwd.h> |
| 20 | #include <fcntl.h> |
| 21 | #include <string.h> |
| 22 | |
| 23 | #include "../../include/job.h" |
| 24 | #include "../../include/macros.h" |
| 25 | #include "../../include/scm_interface.h" |
| 26 | |
| 27 | #define MANIFEST_LOC "/.config/tomd/init/manifest.scm" |
| 28 | |
| 29 | #define MAX_JOBS 10 |
| 30 | |
| 31 | static struct job jobs[MAX_JOBS]; |
| 32 | |
| 33 | static struct job load_job(SCM job_list, int index) |
| 34 | { |
| 35 | struct job ret = { NULL }; |
| 36 | SCM scm_cur_job = SCM_ARR(job_list, index); |
| 37 | |
| 38 | if(scm_is_false(job_predicate(scm_cur_job))){ |
| 39 | tomd_p("job %d wasn't a real job type.", index); |
| 40 | return ret; |
| 41 | } |
| 42 | |
| 43 | SCM scm_name = get_name(scm_cur_job); |
| 44 | SCM scm_cmd = get_cmd(scm_cur_job); |
| 45 | SCM scm_args = get_args(scm_cur_job); |
| 46 | |
| 47 | /* TODO > Handle these. */ |
| 48 | /* planned is to be able to run at different points, and at */ |
| 49 | /* the request of a user. for testing we do things all at */ |
| 50 | /* boot up. */ |
| 51 | SCM scm_start_trigger = get_start_trigger(scm_cur_job); |
| 52 | SCM scm_end_trigger = get_end_trigger(scm_cur_job); |
| 53 | |
| 54 | char *job_name = scm_to_locale_string(scm_name); |
| 55 | char *job_cmd = scm_to_locale_string(scm_cmd); |
| 56 | char *real_args[10]; |
| 57 | int jlen = scm_to_int(scm_length(scm_args)); |
| 58 | for(int j = 0; |
| 59 | j < jlen; |
| 60 | j++){ |
| 61 | real_args[j] = |
| 62 | scm_to_locale_string(SCM_ARR(scm_args, j)); |
| 63 | } |
| 64 | |
| 65 | ret.name = job_name; |
| 66 | ret.cmd = job_cmd; |
| 67 | |
| 68 | for(int j = 1; |
| 69 | j <= jlen; |
| 70 | j++){ |
| 71 | ret.args[j] = real_args[j - 1]; |
| 72 | } |
| 73 | ret.args[jlen + 1] = NULL; |
| 74 | ret.args[0] = ret.cmd; |
| 75 | |
| 76 | return ret; |
| 77 | } |
| 78 | |
| 79 | static void *load_manifest(void *args) |
| 80 | { |
| 81 | char *manifest_loc; |
| 82 | if(!args){ |
| 83 | tomd_p("arg to load_manifest is NULL"); |
| 84 | exit(EXIT_FAILURE); |
| 85 | } |
| 86 | manifest_loc = (char *)args; |
| 87 | |
| 88 | scm_c_primitive_load(args); |
| 89 | |
| 90 | SCM scm_job_list = |
| 91 | scm_c_public_ref("tomd manifest", "job-list"); |
| 92 | |
| 93 | if(scm_is_false(scm_job_list)){ |
| 94 | tomd_p("no job-list found in manifest.scm"); |
| 95 | return NULL; |
| 96 | } |
| 97 | |
| 98 | if(scm_is_false(scm_list_p(scm_job_list))){ |
| 99 | tomd_p("job-list found, but isn't a list."); |
| 100 | return NULL; |
| 101 | } |
| 102 | |
| 103 | int i; |
| 104 | int len = SCM_LIST_LEN(scm_job_list); |
| 105 | tomd_p("len=%d, max=%d", len, MAX_JOBS); |
| 106 | for(i = 0; |
| 107 | i < len && i < MAX_JOBS; |
| 108 | i++){ |
| 109 | jobs[i] = load_job(scm_job_list, i); |
| 110 | } |
| 111 | tomd_p("looked at %d jobs.", i); |
| 112 | jobs[i].cmd = NULL; |
| 113 | } |
| 114 | |
| 115 | static char *lookup_user_folder(void) |
| 116 | { |
| 117 | uid_t user = getuid(); |
| 118 | struct passwd *userpasswd = |
| 119 | getpwuid(user); |
| 120 | |
| 121 | /* take the manifest location and sub ~ for pw_dir */ |
| 122 | char *buffer = (char *)malloc(sizeof(char) * 300); |
| 123 | strcpy(buffer, userpasswd->pw_dir); |
| 124 | int len = strlen(userpasswd->pw_dir); |
| 125 | strcpy(buffer + len, MANIFEST_LOC); |
| 126 | return buffer; |
| 127 | } |
| 128 | |
| 129 | void load_jobs(void) |
| 130 | { |
| 131 | char *manifest = lookup_user_folder(); |
| 132 | tomd_p("Loading jobs from '%s'", manifest); |
| 133 | |
| 134 | void *res = |
| 135 | scm_with_guile(load_manifest, |
| 136 | (void *) manifest); |
| 137 | |
| 138 | tomd_p("Finished loading."); |
| 139 | |
| 140 | int i = 0; |
| 141 | while(1){ |
| 142 | if(i >= MAX_JOBS || |
| 143 | jobs[i].cmd == NULL) { |
| 144 | break; |
| 145 | } |
| 146 | tomd_p("JOB <%d>:", i); |
| 147 | tomd_p(" cmd:'%s'", jobs[i].cmd); |
| 148 | int j = 1; |
| 149 | while(1){ |
| 150 | if(i >= 10 || |
| 151 | jobs[i].args[j] == NULL){ |
| 152 | break; |
| 153 | } |
| 154 | tomd_p(" arg [%d]:'%s'", j, jobs[i].args[j]); |
| 155 | j++; |
| 156 | } |
| 157 | i++; |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | #define LOG_DIR "/var/log/tomd/" |
| 162 | |
| 163 | void run_job(int index) |
| 164 | { |
| 165 | struct job *job = &jobs[index]; |
| 166 | |
| 167 | pid_t pid = fork(); |
| 168 | if(pid == 0){ /* child */ |
| 169 | /* redirect to a file */ |
| 170 | char buf[100]; |
| 171 | strcpy(buf, LOG_DIR); |
| 172 | strcpy(buf + strlen(LOG_DIR), job->name); |
| 173 | tomd_p("redirecting stdout to %s.", buf); |
| 174 | if(unlink(buf) != 0){ |
| 175 | perror("file couldn't be removed."); |
| 176 | } |
| 177 | |
| 178 | int fd = open(buf, O_WRONLY | O_CREAT, 0644); |
| 179 | if(fd < 0){ |
| 180 | perror("[tomd] couldn't open file."); |
| 181 | return; |
| 182 | } |
| 183 | |
| 184 | dup2(fd, STDOUT_FILENO); |
| 185 | dup2(fd, STDERR_FILENO); |
| 186 | close(fd); |
| 187 | execvp(job->cmd, job->args); |
| 188 | tomd_p("execvp for '%s' failed", job->cmd); |
| 189 | perror(""); |
| 190 | exit(EXIT_FAILURE); |
| 191 | }else{ /* parent */ |
| 192 | tomd_p("forked [%d] to run '%s'", pid, job->cmd); |
| 193 | job->pid = pid; |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | void lookup_job(char *my_job_name) |
| 198 | { |
| 199 | |
| 200 | } |
| 201 | |
| 202 | void run_jobs(void) |
| 203 | { |
| 204 | int i; |
| 205 | for(i = 0; |
| 206 | i < MAX_JOBS; |
| 207 | i++){ |
| 208 | if(jobs[i].cmd == NULL){ |
| 209 | tomd_p("out of jobs"); |
| 210 | return; |
| 211 | }else{ |
| 212 | tomd_p("running job [%d] '%s'", i, jobs[i].cmd); |
| 213 | run_job(i); |
| 214 | } |
| 215 | } |
| 216 | } |