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clearly separate usage of statvfs from stat for file existance

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Used statvfs to also check for existance vs lstat. On dead symlinks
this resulted in ENOENT making certain functions fail.

closes #239
This commit is contained in:
Antonio SJ Musumeci 2016-02-29 22:58:13 -05:00
parent 4a63c000ca
commit 4ecf3c5797
11 changed files with 389 additions and 285 deletions
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82
src/fs.cpp
View file

@ -52,8 +52,16 @@ namespace fs
}
bool
exists(const string &path,
struct statvfs &st)
exists(const string &path)
{
struct stat st;
return exists(path,st);
}
bool
statvfs(const string &path,
struct statvfs &st)
{
int rv;
@ -63,22 +71,14 @@ namespace fs
}
bool
exists(const string &path)
{
struct stat st;
return exists(path,st);
}
bool
exists(const string &path,
bool &readonly,
size_t &spaceavail)
info(const string &path,
bool &readonly,
size_t &spaceavail)
{
bool rv;
struct statvfs st;
rv = exists(path,st);
rv = fs::statvfs(path,st);
if(rv)
{
readonly = StatVFS::readonly(st);
@ -89,33 +89,28 @@ namespace fs
}
bool
exists_on_rw_fs(const string &path,
struct statvfs &st)
readonly(const string &path)
{
int rv;
bool rv;
struct statvfs st;
rv = ::statvfs(path.c_str(),&st);
rv = fs::statvfs(path,st);
return (STATVFS_SUCCEEDED(rv) && !StatVFS::readonly(st));
return (rv && StatVFS::readonly(st));
}
bool
exists_on_rw_fs(const string &path)
spaceavail(const string &path,
size_t &spaceavail)
{
bool rv;
struct statvfs st;
return exists_on_rw_fs(path,st);
}
rv = fs::statvfs(path,st);
if(rv)
spaceavail = StatVFS::spaceavail(st);
bool
exists_on_rw_fs_with_at_least(const string &path,
const size_t minfreespace)
{
struct statvfs st;
return (exists_on_rw_fs(path,st)
&&
StatVFS::spaceavail(st) >= minfreespace);
return rv;
}
void
@ -224,20 +219,18 @@ namespace fs
string &path)
{
fsblkcnt_t mfs;
fsblkcnt_t spaceavail;
const string *mfsbasepath;
mfs = 0;
mfsbasepath = NULL;
for(size_t i = 0, ei = basepaths.size(); i != ei; i++)
{
struct statvfs st;
size_t spaceavail;
const string &basepath = basepaths[i];
if(!fs::exists(basepath,st))
if(!fs::spaceavail(basepath,spaceavail))
continue;
spaceavail = StatVFS::spaceavail(st);
if(spaceavail < minfreespace)
continue;
if(spaceavail <= mfs)
@ -254,23 +247,4 @@ namespace fs
return 0;
}
bool
available(const string &path,
const bool needswritablefs,
struct statvfs &st)
{
return (needswritablefs ?
fs::exists_on_rw_fs(path,st) :
fs::exists(path,st));
}
bool
available(const string &path,
const bool needswritablefs)
{
return (needswritablefs ?
fs::exists_on_rw_fs(path) :
fs::exists(path));
}
};