mirror of
https://github.com/versity/scoutfs.git
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e0a2175c2e
Make it static and then use it both for argp_parse as well as cmd_register_argp. Split commands into five groups, to help understanding of their usefulness. Mention that each command has its own help text, and that we are being fancy to keep the user from having to give fs path. Signed-off-by: Andy Grover <agrover@versity.com>
101 lines
1.8 KiB
C
101 lines
1.8 KiB
C
#define _GNU_SOURCE
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <wordexp.h>
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#include "util.h"
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#define ENV_PATH "SCOUTFS_MOUNT_PATH"
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static int open_path(char *path, int flags)
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{
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wordexp_t exp_result;
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int ret;
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ret = wordexp(path, &exp_result, WRDE_NOCMD | WRDE_SHOWERR | WRDE_UNDEF);
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if (ret) {
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fprintf(stderr, "wordexp() failure for \"%s\": %d\n", path, ret);
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ret = -EINVAL;
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goto out;
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}
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ret = open(exp_result.we_wordv[0], flags);
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if (ret < 0) {
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ret = -errno;
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fprintf(stderr, "failed to open '%s': %s (%d)\n",
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path, strerror(errno), errno);
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}
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out:
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wordfree(&exp_result);
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return ret;
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}
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/*
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* 1. if path option given, use that
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* 2. if env var, use that
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* 3. if cwd is in a scoutfs fs, use that
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* 4. else error
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*/
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int get_path(char *path, int flags)
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{
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char *env_path;
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char *cur_dir_path;
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int ret;
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if (path)
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return open_path(path, flags);
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env_path = getenv(ENV_PATH);
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if (env_path)
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return open_path(path, flags);
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cur_dir_path = get_current_dir_name();
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if (!cur_dir_path) {
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ret = -errno;
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return ret;
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}
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ret = open_path(cur_dir_path, flags);
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free(cur_dir_path);
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// TODO: check this is within a scoutfs mount?
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return ret;
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}
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int read_block(int fd, u64 blkno, int shift, void **ret_val)
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{
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size_t size = 1ULL << shift;
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void *buf;
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int ret;
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*ret_val = NULL;
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buf = malloc(size);
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if (!buf)
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return -ENOMEM;
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ret = pread(fd, buf, size, blkno << shift);
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if (ret == -1) {
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fprintf(stderr, "read blkno %llu returned %d: %s (%d)\n",
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blkno, ret, strerror(errno), errno);
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free(buf);
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return -errno;
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} else if (ret != size) {
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fprintf(stderr, "incomplete pread\n");
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free(buf);
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return -EINVAL;
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} else {
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*ret_val = buf;
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return 0;
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}
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}
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