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Introduce xbps_repo_{un,}lock() to serialize write access to repodata.

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We use a simple file lock that is created with O_CREAT|O_EXCL.
This should fix the concurrency issues with multiple processes
running xbps-rindex -a/-c on the same repository/arch combo.
This commit is contained in:
Juan RP
2015-03-25 12:00:59 +01:00
parent bb4ebf8152
commit 9a16283575
7 changed files with 120 additions and 44 deletions
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15
bin/xbps-rindex/index-add.c
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@@ -43,8 +43,8 @@ index_add(struct xbps_handle *xhp, int args, int argmax, char **argv, bool force
xbps_dictionary_t idx, idxmeta, binpkgd, curpkgd;
struct xbps_repo *repo = NULL;
struct stat st;
char *tmprepodir = NULL, *repodir = NULL;
int rv = 0, ret = 0;
char *tmprepodir = NULL, *repodir = NULL, *rlockfname = NULL;
int rv = 0, ret = 0, rlockfd = -1;
bool flush = false;
assert(argv);
@@ -55,7 +55,13 @@ index_add(struct xbps_handle *xhp, int args, int argmax, char **argv, bool force
return ENOMEM;
repodir = dirname(tmprepodir);
repo = xbps_repo_open(xhp, repodir, true);
if (!xbps_repo_lock(xhp, repodir, &rlockfd, &rlockfname)) {
fprintf(stderr, "xbps-rindex: cannot lock repository "
"%s: %s\n", repodir, strerror(errno));
rv = -1;
goto out;
}
repo = xbps_repo_open(xhp, repodir);
if (repo == NULL && errno != ENOENT) {
fprintf(stderr, "xbps-rindex: cannot open/lock repository "
"%s: %s\n", repodir, strerror(errno));
@@ -217,6 +223,9 @@ index_add(struct xbps_handle *xhp, int args, int argmax, char **argv, bool force
out:
if (repo)
xbps_repo_close(repo);
xbps_repo_unlock(rlockfd, rlockfname);
if (tmprepodir)
free(tmprepodir);