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utils: make detect_ramfs_rootfs() return bool

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Signed-off-by: Christian Brauner <christian.brauner@canonical.com>
This commit is contained in:
Christian Brauner 2016-09-06 13:49:13 +02:00
parent 92281f0275
commit fa454c8e3b
2 changed files with 17 additions and 13 deletions
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20
src/lxc/utils.c
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@ -1158,18 +1158,20 @@ bool switch_to_ns(pid_t pid, const char *ns) {
* IIUC, so long as we've chrooted so that rootfs is not our root,
* the rootfs entry should always be skipped in mountinfo contents.
*/
int detect_ramfs_rootfs(void)
bool detect_ramfs_rootfs(void)
{
char buf[LINELEN], *p;
FILE *f;
char *p, *p2;
char *line = NULL;
size_t len = 0;
int i;
char *p2;
f = fopen("/proc/self/mountinfo", "r");
if (!f)
return 0;
while (fgets(buf, LINELEN, f)) {
for (p = buf, i=0; p && i < 4; i++)
return false;
while (getline(&line, &len, f) != -1) {
for (p = line, i = 0; p && i < 4; i++)
p = strchr(p + 1, ' ');
if (!p)
continue;
@ -1181,13 +1183,15 @@ int detect_ramfs_rootfs(void)
// this is '/'. is it the ramfs?
p = strchr(p2 + 1, '-');
if (p && strncmp(p, "- rootfs rootfs ", 16) == 0) {
free(line);
fclose(f);
return 1;
return true;
}
}
}
free(line);
fclose(f);
return 0;
return false;
}
char *on_path(char *cmd, const char *rootfs) {

2
src/lxc/utils.h
View File

@ -293,7 +293,7 @@ extern bool dir_exists(const char *path);
uint64_t fnv_64a_buf(void *buf, size_t len, uint64_t hval);
int detect_shared_rootfs(void);
int detect_ramfs_rootfs(void);
bool detect_ramfs_rootfs(void);
char *on_path(char *cmd, const char *rootfs);
bool file_exists(const char *f);
bool cgns_supported(void);