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deletePath(): Succeed if path doesn't exist

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Also makes it robust against concurrent deletions.
This commit is contained in:
Eelco Dolstra 2016-02-24 17:44:12 +01:00
parent 28e7e29abd
commit 152b1d6bf9
5 changed files with 23 additions and 23 deletions
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12
src/libutil/util.cc
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@ -320,9 +320,11 @@ static void _deletePath(const Path & path, unsigned long long & bytesFreed)
{
checkInterrupt();
printMsg(lvlVomit, format("%1%") % path);
struct stat st = lstat(path);
struct stat st;
if (lstat(path.c_str(), &st) == -1) {
if (errno == ENOENT) return;
throw SysError(format("getting status of ‘%1%’") % path);
}
if (!S_ISDIR(st.st_mode) && st.st_nlink == 1)
bytesFreed += st.st_blocks * 512;
@ -338,8 +340,10 @@ static void _deletePath(const Path & path, unsigned long long & bytesFreed)
_deletePath(path + "/" + i.name, bytesFreed);
}
if (remove(path.c_str()) == -1)
if (remove(path.c_str()) == -1) {
if (errno == ENOENT) return;
throw SysError(format("cannot unlink ‘%1%’") % path);
}
}

4
src/libutil/util.hh
View file

@ -92,8 +92,8 @@ string readLine(int fd);
void writeLine(int fd, string s);
/* Delete a path; i.e., in the case of a directory, it is deleted
recursively. Don't use this at home, kids. The second variant
returns the number of bytes and blocks freed. */
recursively. It's not an error if the path does not exist. The
second variant returns the number of bytes and blocks freed. */
void deletePath(const Path & path);
void deletePath(const Path & path, unsigned long long & bytesFreed);