aa8fbc74e3
Now that we don't (mis-)use the env file parser to parse kernel command lines there's no need anymore to override the used newline character set. Let's hence drop the argument and just "\n\r" always. This nicely simplifies our code.
118 lines
3 KiB
C
118 lines
3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include "alloc-util.h"
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#include "fd-util.h"
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#include "fs-util.h"
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#include "macro.h"
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#include "os-util.h"
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#include "strv.h"
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#include "fileio.h"
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#include "string-util.h"
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int path_is_os_tree(const char *path) {
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int r;
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assert(path);
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/* Does the path exist at all? If not, generate an error immediately. This is useful so that a missing root dir
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* always results in -ENOENT, and we can properly distuingish the case where the whole root doesn't exist from
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* the case where just the os-release file is missing. */
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if (laccess(path, F_OK) < 0)
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return -errno;
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/* We use {/etc|/usr/lib}/os-release as flag file if something is an OS */
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r = open_os_release(path, NULL, NULL);
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if (r == -ENOENT) /* We got nothing */
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return 0;
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if (r < 0)
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return r;
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return 1;
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}
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int open_os_release(const char *root, char **ret_path, int *ret_fd) {
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_cleanup_free_ char *q = NULL;
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const char *p;
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int k;
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FOREACH_STRING(p, "/etc/os-release", "/usr/lib/os-release") {
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k = chase_symlinks(p, root, CHASE_PREFIX_ROOT|(ret_fd ? CHASE_OPEN : 0), (ret_path ? &q : NULL));
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if (k != -ENOENT)
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break;
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}
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if (k < 0)
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return k;
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if (ret_fd) {
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int real_fd;
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/* Convert the O_PATH fd into a proper, readable one */
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real_fd = fd_reopen(k, O_RDONLY|O_CLOEXEC|O_NOCTTY);
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safe_close(k);
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if (real_fd < 0)
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return real_fd;
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*ret_fd = real_fd;
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}
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if (ret_path)
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*ret_path = TAKE_PTR(q);
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return 0;
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}
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int fopen_os_release(const char *root, char **ret_path, FILE **ret_file) {
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_cleanup_free_ char *p = NULL;
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_cleanup_close_ int fd = -1;
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FILE *f;
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int r;
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if (!ret_file)
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return open_os_release(root, ret_path, NULL);
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r = open_os_release(root, ret_path ? &p : NULL, &fd);
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if (r < 0)
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return r;
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f = fdopen(fd, "re");
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if (!f)
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return -errno;
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fd = -1;
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*ret_file = f;
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if (ret_path)
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*ret_path = TAKE_PTR(p);
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return 0;
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}
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int parse_os_release(const char *root, ...) {
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_cleanup_fclose_ FILE *f = NULL;
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_cleanup_free_ char *p = NULL;
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va_list ap;
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int r;
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r = fopen_os_release(root, &p, &f);
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if (r < 0)
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return r;
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va_start(ap, root);
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r = parse_env_filev(f, p, ap);
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va_end(ap);
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return r;
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}
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int load_os_release_pairs(const char *root, char ***ret) {
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_cleanup_fclose_ FILE *f = NULL;
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_cleanup_free_ char *p = NULL;
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int r;
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r = fopen_os_release(root, &p, &f);
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if (r < 0)
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return r;
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return load_env_file_pairs(f, p, ret);
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}
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