diff options
Diffstat (limited to 'cmd/service/dumpscript.c')
| -rw-r--r-- | cmd/service/dumpscript.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/cmd/service/dumpscript.c b/cmd/service/dumpscript.c new file mode 100644 index 0000000..880631f --- /dev/null +++ b/cmd/service/dumpscript.c @@ -0,0 +1,182 @@ +/* SPDX-License-Identifier: GPL-3.0-or-later */ +/* + * Copyright (C) 2018 - David Oberhollenzer + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <https://www.gnu.org/licenses/>. + */ +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> +#include <fcntl.h> +#include <errno.h> + +#include "servicecmd.h" +#include "service.h" + +static service_t *try_load(const char *directory, const char *filename) +{ + int dirfd, type; + struct stat sb; + service_t *svc; + + dirfd = open(directory, O_RDONLY | O_DIRECTORY); + + if (dirfd < 0) { + perror(directory); + return NULL; + } + + if (fstatat(dirfd, filename, &sb, AT_SYMLINK_NOFOLLOW)) { + fprintf(stderr, "stat %s/%s: %s\n", + directory, filename, strerror(errno)); + close(dirfd); + return NULL; + } + + type = (sb.st_mode & S_IFMT); + + if (type != S_IFREG && type != S_IFLNK) + return NULL; + + svc = rdsvc(dirfd, filename); + close(dirfd); + return svc; +} + +enum { + NEED_QUOTES = 0x01, + NEED_ESCAPE = 0x02, +}; + +static int check_str(const char *str) +{ + int ret = 0; + + while (*str != '\0') { + if (isspace(*str)) + ret |= NEED_QUOTES; + + if (!isascii(*str) || !isprint(*str)) + ret |= NEED_ESCAPE | NEED_QUOTES; + + if (*str == '\\' || *str == '"' || *str == '\n') + ret |= NEED_ESCAPE | NEED_QUOTES; + + ++str; + } + + return ret; +} + +static void print_str(const char *str) +{ + int flags = check_str(str); + + if (flags & NEED_QUOTES) + fputc('"', stdout); + + if (flags & NEED_ESCAPE) { + while (*str != '\0') { + switch (*str) { + case '\a': fputs("\\a", stdout); break; + case '\b': fputs("\\b", stdout); break; + case '\f': fputs("\\f", stdout); break; + case '\r': fputs("\\r", stdout); break; + case '\t': fputs("\\t", stdout); break; + case '\n': fputs("\\n", stdout); break; + case '\\': + case '"': + fprintf(stdout, "\\%c", *str); + break; + default: + if (!isascii(*str) || !isprint(*str)) { + fprintf(stdout, "\\x%02X", *str); + } else { + fputc(*str, stdout); + } + break; + } + ++str; + } + } else { + fputs(str, stdout); + } + + if (flags & NEED_QUOTES) + fputc('"', stdout); +} + +static int cmd_dumpscript(int argc, char **argv) +{ + char *filename, *ptr; + service_t *svc; + size_t len; + exec_t *e; + int i; + + if (check_arguments(argv[0], argc, 2, 3)) + return EXIT_FAILURE; + + for (len = 1, i = 1; i < argc; ++i) + len += strlen(argv[i]) + 1; + + filename = alloca(len); + filename[0] = '\0'; + + for (i = 1; i < argc; ++i) { + if (i > 1) + strcat(filename, "@"); + strcat(filename, argv[i]); + } + + svc = try_load(SVCDIR, filename); + + if (svc == NULL) { + fprintf(stderr, "Could not load service '%s'\n", filename); + return EXIT_FAILURE; + } + + fprintf(stdout, "#\n# commands executed for serice '%s'\n#\n", + filename); + + for (e = svc->exec; e != NULL; e = e->next) { + ptr = e->args; + + for (i = 0; i < e->argc; ++i) { + if (i) + fputc(' ', stdout); + + print_str(ptr); + ptr += strlen(ptr) + 1; + } + + putchar('\n'); + } + + delsvc(svc); + return EXIT_SUCCESS; +} + +static command_t dumpscript = { + .cmd = "dumpscript", + .usage = "<name> [arguments]", + .s_desc = "print commands executed for a service", + .l_desc = "This parses a service file from " SVCDIR " and " + "produces a pseudo-shell-script containing the " + "exact commands after argument expansion that init " + "runs when starting the service.", + .run_cmd = cmd_dumpscript, +}; + +REGISTER_COMMAND(dumpscript) |