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Old 06-02-2008, 11:59 AM
"Dan McGee"
 
Default Get rid of double / in database paths.

On Mon, Jun 2, 2008 at 4:56 AM, Xavier <shiningxc@gmail.com> wrote:
> >From c69a3efc4d6e08ea967a936afc8f9622e1e6b268 Mon Sep 17 00:00:00 2001
> From: Xavier Chantry <shiningxc@gmail.com>
> Date: Fri, 30 May 2008 08:52:27 +0200
> Subject: [PATCH] Get rid of double / in database paths.
>
> Errors like the following one happen regularly (for unknown reasons...) :
> error: could not open file /var/lib/pacman/local//glibc-2.7-9/depends: No
> such file or directory
>
> Anyway, every time an user reported an error like that, it always seemed
> like he thought the error was caused by the double /, which is obviously
> wrong.
>
> Since db->path always include a trailing /, there is no need to add one when
> concatenating paths in be_files.c or add.c.
> Additionally, some static strings were switched to dynamic.
> And the computation of the "dbpath"/"pkgname"-"pkgversion" was refactored
> in db_read, db_write and db_remove with a get_pkgpath static function.
>
> Signed-off-by: Xavier Chantry <shiningxc@gmail.com>
> ---
> lib/libalpm/add.c | 4 +-
> lib/libalpm/be_files.c | 98 ++++++++++++++++++++++++++++++++----------------
> 2 files changed, 68 insertions(+), 34 deletions(-)
>
> diff --git a/lib/libalpm/add.c b/lib/libalpm/add.c
> index c5454ba..3d53a1c 100644
> --- a/lib/libalpm/add.c
> +++ b/lib/libalpm/add.c
> @@ -287,12 +287,12 @@ static int extract_single_file(struct archive *archive,
>
> if(strcmp(entryname, ".INSTALL") == 0) {
> /* the install script goes inside the db */
> - snprintf(filename, PATH_MAX, "%s/%s-%s/install", db->path,
> + snprintf(filename, PATH_MAX, "%s%s-%s/install", db->path,
> newpkg->name, newpkg->version);
> archive_entry_set_mode(entry, 0644);
> } else if(strcmp(entryname, ".CHANGELOG") == 0) {
> /* the changelog goes inside the db */
> - snprintf(filename, PATH_MAX, "%s/%s-%s/changelog", db->path,
> + snprintf(filename, PATH_MAX, "%s%s-%s/changelog", db->path,
> newpkg->name, newpkg->version);
> archive_entry_set_mode(entry, 0644);
> } else if(*entryname == '.') {
> diff --git a/lib/libalpm/be_files.c b/lib/libalpm/be_files.c
> index 2302374..6eebab7 100644
> --- a/lib/libalpm/be_files.c
> +++ b/lib/libalpm/be_files.c
> @@ -56,6 +56,7 @@ time_t getlastupdate(const pmdb_t *db)
> FILE *fp;
> char *file;
> time_t ret = 0;
> + int len = 0;
>
> ALPM_LOG_FUNC;
>
> @@ -64,8 +65,9 @@ time_t getlastupdate(const pmdb_t *db)
> }
>
> /* db->path + '.lastupdate' + NULL */
> - MALLOC(file, strlen(db->path) + 12, RET_ERR(PM_ERR_MEMORY, ret));
> - sprintf(file, "%s.lastupdate", db->path);
> + len = strlen(db->path) + 12;
> + CALLOC(file, len, sizeof(char), RET_ERR(PM_ERR_MEMORY, ret));
> + snprintf(file, len, "%s.lastupdate", db->path);
These function switches aren't really necessary:
1. malloc -> calloc: we are filling the whole of the newly allocated
memory as soon as we get it, so really no need to zero it out
2. sprintf -> snprintf: no need for the checked function as we already
did an strlen() call anyway, so we won't have overflow issues, and
sprintf is more efficient

>
> /* get the last update time, if it's there */
> if((fp = fopen(file, "r")) == NULL) {
> @@ -90,6 +92,7 @@ int setlastupdate(const pmdb_t *db, time_t time)
> FILE *fp;
> char *file;
> int ret = 0;
> + int len = 0;
>
> ALPM_LOG_FUNC;
>
> @@ -98,8 +101,9 @@ int setlastupdate(const pmdb_t *db, time_t time)
> }
>
> /* db->path + '.lastupdate' + NULL */
> - MALLOC(file, strlen(db->path) + 12, RET_ERR(PM_ERR_MEMORY, ret));
> - sprintf(file, "%s.lastupdate", db->path);
> + len = strlen(db->path) + 12;
> + CALLOC(file, len, sizeof(char), RET_ERR(PM_ERR_MEMORY, ret));
> + snprintf(file, len, "%s.lastupdate", db->path);
Same as above.

>
> if((fp = fopen(file, "w")) == NULL) {
> free(file);
> @@ -123,9 +127,11 @@ int setlastupdate(const pmdb_t *db, time_t time)
> int SYMEXPORT alpm_db_update(int force, pmdb_t *db)
> {
> alpm_list_t *lp;
> - char path[PATH_MAX];
> + char *dbfile, *dbfilepath;
> time_t newmtime = 0, lastupdate = 0;
> const char *dbpath;
> + int len;
> +
> int ret;
>
> ALPM_LOG_FUNC;
> @@ -154,11 +160,15 @@ int SYMEXPORT alpm_db_update(int force, pmdb_t *db)
> }
> }
>
> - snprintf(path, PATH_MAX, "%s" DBEXT, db->treename);
> + len = strlen(db->treename) + strlen(DBEXT) + 1;
> + CALLOC(dbfile, len, sizeof(char), RET_ERR(PM_ERR_MEMORY, -1));
> + snprintf(dbfile, len, "%s" DBEXT, db->treename);
Now this is legit; of course i would prefer the MALLOC/sprintf combo
as described above but it is nice to eliminate the PATH_MAX variable.

> dbpath = alpm_option_get_dbpath();
>
> - ret = _alpm_download_single_file(path, db->servers, dbpath,
> + ret = _alpm_download_single_file(dbfile, db->servers, dbpath,
> lastupdate, &newmtime);
> + free(dbfile);
>
> if(ret == 1) {
> /* mtimes match, do nothing */
> @@ -169,9 +179,6 @@ int SYMEXPORT alpm_db_update(int force, pmdb_t *db)
> _alpm_log(PM_LOG_DEBUG, "failed to sync db: %s
", alpm_strerrorlast());
> return(-1);
> } else {
> - /* form the path to the db location */
> - snprintf(path, PATH_MAX, "%s%s" DBEXT, dbpath, db->treename);
> -
> /* remove the old dir */
> _alpm_log(PM_LOG_DEBUG, "flushing database %s
", db->path);
> for(lp = _alpm_db_get_pkgcache(db); lp; lp = lp->next) {
> @@ -186,11 +193,19 @@ int SYMEXPORT alpm_db_update(int force, pmdb_t *db)
> /* Cache needs to be rebuilt */
> _alpm_db_free_pkgcache(db);
>
> + /* form the path to the db location */
> + len = strlen(dbpath) + strlen(db->treename) + strlen(DBEXT) + 1;
> + CALLOC(dbfilepath, len, sizeof(char), RET_ERR(PM_ERR_MEMORY, -1));
> + snprintf(dbfilepath, len, "%s%s" DBEXT, dbpath, db->treename);
> +
> /* uncompress the sync database */
> - if(_alpm_unpack(path, db->path, NULL)) {
> + ret = _alpm_unpack(dbfilepath, db->path, NULL);
> + if(ret) {
> + free(dbfilepath);
> RET_ERR(PM_ERR_SYSTEM, -1);
> }
> - unlink(path);
> + unlink(dbfilepath);
> + free(dbfilepath);
>
> /* if we have a new mtime, set the DB last update value */
> if(newmtime) {
> @@ -293,7 +308,7 @@ int _alpm_db_populate(pmdb_t *db)
> continue;
> }
> /* stat the entry, make sure it's a directory */
> - snprintf(path, PATH_MAX, "%s/%s", db->path, name);
> + snprintf(path, PATH_MAX, "%s%s", db->path, name);
> if(stat(path, &sbuf) != 0 || !S_ISDIR(sbuf.st_mode)) {
> continue;
> }
> @@ -329,12 +344,24 @@ int _alpm_db_populate(pmdb_t *db)
> return(count);
> }
>
> +
> +static char *get_pkgpath(pmdb_t *db, pmpkg_t *info)
Can you add some comments to this saying the return value must be
freed by the caller?
> +{
> + int len;
> + char *pkgpath;
> + len = strlen(db->path) + strlen(info->name) + strlen(info->version) + 3;
> + CALLOC(pkgpath, len, sizeof(char), RET_ERR(PM_ERR_MEMORY, NULL));
> + snprintf(pkgpath, len, "%s%s-%s/", db->path, info->name, info->version);
MALLOC/sprintf.
> + return(pkgpath);
> +}
> +
> int _alpm_db_read(pmdb_t *db, pmpkg_t *info, pmdbinfrq_t inforeq)
> {
> FILE *fp = NULL;
> struct stat buf;
> char path[PATH_MAX];
> char line[513];
> + char *pkgpath = NULL;
>
> ALPM_LOG_FUNC;
>
> @@ -367,17 +394,19 @@ int _alpm_db_read(pmdb_t *db, pmpkg_t *info,
> pmdbinfrq_t inforeq)
> /* clear out 'line', to be certain - and to make valgrind happy */
> memset(line, 0, 513);
>
> - snprintf(path, PATH_MAX, "%s/%s-%s", db->path, info->name, info->version);
> - if(stat(path, &buf)) {
> + pkgpath = get_pkgpath(db, info);
> +
> + if(stat(pkgpath, &buf)) {
> /* directory doesn't exist or can't be opened */
> _alpm_log(PM_LOG_DEBUG, "cannot find '%s-%s' in db '%s'
",
> info->name, info->version, db->treename);
> + free(pkgpath);
> return(-1);
> }
>
> /* DESC */
> if(inforeq & INFRQ_DESC) {
> - snprintf(path, PATH_MAX, "%s/%s-%s/desc", db->path, info->name,
> info->version);
> + snprintf(path, PATH_MAX, "%sdesc", pkgpath);
> if((fp = fopen(path, "r")) == NULL) {
> _alpm_log(PM_LOG_ERROR, _("could not open file %s: %s
"), path,
> strerror(errno));
> goto error;
> @@ -521,7 +550,7 @@ int _alpm_db_read(pmdb_t *db, pmpkg_t *info,
> pmdbinfrq_t inforeq)
>
> /* FILES */
> if(inforeq & INFRQ_FILES) {
> - snprintf(path, PATH_MAX, "%s/%s-%s/files", db->path, info->name,
> info->version);
> + snprintf(path, PATH_MAX, "%sfiles", pkgpath);
> if((fp = fopen(path, "r")) == NULL) {
> _alpm_log(PM_LOG_ERROR, _("could not open file %s: %s
"), path,
> strerror(errno));
> goto error;
> @@ -548,7 +577,7 @@ int _alpm_db_read(pmdb_t *db, pmpkg_t *info,
> pmdbinfrq_t inforeq)
>
> /* DEPENDS */
> if(inforeq & INFRQ_DEPENDS) {
> - snprintf(path, PATH_MAX, "%s/%s-%s/depends", db->path, info->name,
> info->version);
> + snprintf(path, PATH_MAX, "%sdepends", pkgpath);
> if((fp = fopen(path, "r")) == NULL) {
> _alpm_log(PM_LOG_ERROR, _("could not open file %s: %s
"), path,
> strerror(errno));
> goto error;
> @@ -587,8 +616,7 @@ int _alpm_db_read(pmdb_t *db, pmpkg_t *info,
> pmdbinfrq_t inforeq)
>
> /* DELTAS */
> if(inforeq & INFRQ_DELTAS) {
> - snprintf(path, PATH_MAX, "%s/%s-%s/deltas", db->path,
> - info->name, info->version);
> + snprintf(path, PATH_MAX, "%sdeltas", pkgpath);
> if((fp = fopen(path, "r"))) {
> while(!feof(fp)) {
> fgets(line, 255, fp);
> @@ -606,7 +634,7 @@ int _alpm_db_read(pmdb_t *db, pmpkg_t *info,
> pmdbinfrq_t inforeq)
>
> /* INSTALL */
> if(inforeq & INFRQ_SCRIPTLET) {
> - snprintf(path, PATH_MAX, "%s/%s-%s/install", db->path, info->name,
> info->version);
> + snprintf(path, PATH_MAX, "%sinstall", pkgpath);
> if(!stat(path, &buf)) {
> info->scriptlet = 1;
> }
Ahh, much cleaner there in forming paths. But did you forget to free
pkgpath at the end of the function?

> @@ -632,6 +660,7 @@ int _alpm_db_write(pmdb_t *db, pmpkg_t *info,
> pmdbinfrq_t inforeq)
> alpm_list_t *lp = NULL;
> int retval = 0;
> int local = 0;
> + char *pkgpath = NULL;
>
> ALPM_LOG_FUNC;
>
> @@ -639,9 +668,10 @@ int _alpm_db_write(pmdb_t *db, pmpkg_t *info,
> pmdbinfrq_t inforeq)
> return(-1);
> }
>
> - snprintf(path, PATH_MAX, "%s/%s-%s", db->path, info->name, info->version);
> + pkgpath = get_pkgpath(db, info);
> +
> oldmask = umask(0000);
> - mkdir(path, 0755);
> + mkdir(pkgpath, 0755);
> /* make sure we have a sane umask */
> umask(0022);
>
> @@ -653,7 +683,7 @@ int _alpm_db_write(pmdb_t *db, pmpkg_t *info,
> pmdbinfrq_t inforeq)
> if(inforeq & INFRQ_DESC) {
> _alpm_log(PM_LOG_DEBUG, "writing %s-%s DESC information back to db
",
> info->name, info->version);
> - snprintf(path, PATH_MAX, "%s/%s-%s/desc", db->path, info->name,
> info->version);
> + snprintf(path, PATH_MAX, "%sdesc", pkgpath);
> if((fp = fopen(path, "w")) == NULL) {
> _alpm_log(PM_LOG_ERROR, _("could not open file %s: %s
"), path,
> strerror(errno));
> retval = -1;
> @@ -741,7 +771,7 @@ int _alpm_db_write(pmdb_t *db, pmpkg_t *info,
> pmdbinfrq_t inforeq)
> if(local && (inforeq & INFRQ_FILES)) {
> _alpm_log(PM_LOG_DEBUG, "writing %s-%s FILES information back to db
",
> info->name, info->version);
> - snprintf(path, PATH_MAX, "%s/%s-%s/files", db->path, info->name,
> info->version);
> + snprintf(path, PATH_MAX, "%sfiles", pkgpath);
> if((fp = fopen(path, "w")) == NULL) {
> _alpm_log(PM_LOG_ERROR, _("could not open file %s: %s
"), path,
> strerror(errno));
> retval = -1;
> @@ -769,7 +799,7 @@ int _alpm_db_write(pmdb_t *db, pmpkg_t *info,
> pmdbinfrq_t inforeq)
> if(inforeq & INFRQ_DEPENDS) {
> _alpm_log(PM_LOG_DEBUG, "writing %s-%s DEPENDS information back to db
",
> info->name, info->version);
> - snprintf(path, PATH_MAX, "%s/%s-%s/depends", db->path, info->name,
> info->version);
> + snprintf(path, PATH_MAX, "%sdepends", pkgpath);
> if((fp = fopen(path, "w")) == NULL) {
> _alpm_log(PM_LOG_ERROR, _("could not open file %s: %s
"), path,
> strerror(errno));
> retval = -1;
> @@ -814,6 +844,7 @@ int _alpm_db_write(pmdb_t *db, pmpkg_t *info,
> pmdbinfrq_t inforeq)
>
> cleanup:
> umask(oldmask);
> + free(pkgpath);
>
> if(fp) {
> fclose(fp);
> @@ -824,7 +855,8 @@ cleanup:
>
> int _alpm_db_remove(pmdb_t *db, pmpkg_t *info)
> {
> - char path[PATH_MAX];
> + int ret = 0;
> + char *pkgpath = NULL;
>
> ALPM_LOG_FUNC;
>
> @@ -832,12 +864,14 @@ int _alpm_db_remove(pmdb_t *db, pmpkg_t *info)
> RET_ERR(PM_ERR_DB_NULL, -1);
> }
>
> - snprintf(path, PATH_MAX, "%s%s-%s", db->path, info->name, info->version);
> - if(_alpm_rmrf(path) == -1) {
> - return(-1);
> - }
> + pkgpath = get_pkgpath(db, info);
>
> - return(0);
> + ret = _alpm_rmrf(pkgpath);
> + free(pkgpath);
> + if(ret != 0) {
> + ret = -1;
> + }
> + return(ret);
> }
>
> /* vim: set ts=2 sw=2 noet: */
> --
> 1.5.5.1

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