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* Canonicalise metadata of all files in store paths (set the mtime to

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0, set the mode to either 444 or 555, set the group to the default).
This commit is contained in:
Eelco Dolstra 2004-11-29 15:09:29 +00:00
parent 5d5318c2ff
commit 4115d8d8ce
1 changed files with 58 additions and 2 deletions
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60
src/libstore/normalise.cc
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@ -8,6 +8,7 @@
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <utime.h>
#include "normalise.hh"
#include "references.hh"
@ -298,6 +299,61 @@ Path queryNormalForm(const Path & nePath)
}
/* "Fix", or canonicalise, the meta-data of the files in a store path
after it has been built. In particular:
- the last modification date on each file is set to 0 (i.e.,
00:00:00 1/1/1970 UTC)
- the permissions are set of 444 or 555 (i.e., read-only with or
without execute permission; setuid bits etc. are cleared)
- the owner and group are set to the Nix user and group, if we're
in a setuid Nix installation
*/
void canonicalisePathMetaData(const Path & path)
{
checkInterrupt();
struct stat st;
if (lstat(path.c_str(), &st))
throw SysError(format("getting attributes of path `%1%'") % path);
cerr << "foo!" << path << "\n";
if (!S_ISLNK(st.st_mode)) {
/* Mask out all type related bits. */
mode_t mode = st.st_mode & ~S_IFMT;
if (mode != 0444 && mode != 0555) {
mode = (st.st_mode & S_IFMT)
| 0444
| (st.st_mode & S_IXUSR ? 0111 : 0);
if (chmod(path.c_str(), mode) == -1)
throw SysError(format("changing mode of `%1%' to %2$o") % path % mode);
}
if (st.st_uid != getuid() || st.st_gid != getgid()) {
if (chown(path.c_str(), getuid(), getgid()) == -1)
throw SysError(format("changing owner/group of `%1%' to %2%/%3%")
% path % getuid() % getgid());
}
}
if (st.st_mtime != 0) {
struct utimbuf utimbuf;
utimbuf.actime = st.st_atime;
utimbuf.modtime = 0;
if (utime(path.c_str(), &utimbuf) == -1)
throw SysError(format("changing modification time of `%1%'") % path);
}
if (S_ISDIR(st.st_mode)) {
Strings names = readDirectory(path);
for (Strings::iterator i = names.begin(); i != names.end(); ++i)
canonicalisePathMetaData(path + "/" + *i);
}
}
//////////////////////////////////////////////////////////////////////
@ -1009,7 +1065,7 @@ void NormalisationGoal::createClosure()
}
nf.closure.roots.insert(path);
makePathReadOnly(path);
canonicalisePathMetaData(path);
/* For this output path, find the references to other paths contained
in it. */
@ -1601,7 +1657,7 @@ void SubstitutionGoal::finished()
return;
}
makePathReadOnly(storePath);
canonicalisePathMetaData(storePath);
Transaction txn;
createStoreTransaction(txn);