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authorPang Yan Han <pangyanhan@gmail.com>2012-08-01 17:34:37 +0200
committerAllan McRae <allan@archlinux.org>2013-01-04 21:49:37 +1000
commitb6320de4be2e39b01c1c03ebac2ffcdfa7ab7098 (patch)
tree50a7993f55866df8354cc857dd298720d0cb6ef6 /lib
parent27d9c25ee2fd6a03fb1ec1afdfbe105048875bae (diff)
Save backup files with extension .pacsave.n
Teach pacman to save backup files with extension .pacsave.n, where n is a positive integer. The current backup file shall be saved as <name>.pacsave, while existing .pacsave.n files will be renamed to <name>.pacsave.n+1 Example: 1. You have subversion installed in your local repo. /etc/conf.d/svnserve is a file to be backed up. It contains local modifications 2. You remove subversion from your repo. /etc/conf.d/svnserve is backed up as /etc/conf.d/svnserve.pacsave 2. You install subversion again 3. You edit /etc/conf.d/svnserve 4. You remove subversion. The existing /etc/conf.d/svnserve.pacsave is renamed to /etc/conf.d/svnserve.pacsave.1 and /etc/conf.d/svnserve is backed up as /etc/conf.d/svnserve.pacsave Signed-off-by: Pang Yan Han <pangyanhan@gmail.com> Rebased from original email and adjusted for util-common usage. Signed-off-by: Florian Pritz <bluewind@xinu.at> Signed-off-by: Allan McRae <allan@archlinux.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/libalpm/remove.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/lib/libalpm/remove.c b/lib/libalpm/remove.c
index b965391e..cdc572d9 100644
--- a/lib/libalpm/remove.c
+++ b/lib/libalpm/remove.c
@@ -26,8 +26,11 @@
#include <errno.h>
#include <string.h>
#include <limits.h>
+#include <dirent.h>
+#include <regex.h>
#include <unistd.h>
#include <sys/stat.h>
+#include <sys/types.h>
/* libalpm */
#include "remove.h"
@@ -299,6 +302,78 @@ static int can_remove_file(alpm_handle_t *handle, const alpm_file_t *file,
return 1;
}
+static void shift_pacsave(alpm_handle_t *handle, const char *file)
+{
+ DIR *dir = NULL;
+ struct dirent *ent;
+ struct stat st;
+ regex_t reg;
+
+ const char *basename;
+ char *dirname;
+ char oldfile[PATH_MAX];
+ char newfile[PATH_MAX];
+ char regstr[PATH_MAX];
+
+ unsigned long log_max = 0;
+ size_t basename_len;
+
+ dirname = mdirname(file);
+ if(!dirname) {
+ return;
+ }
+
+ basename = mbasename(file);
+ basename_len = strlen(basename);
+
+ snprintf(regstr, PATH_MAX, "^%s\\.pacsave\\.([[:digit:]]+)$", basename);
+ if(regcomp(&reg, regstr, REG_EXTENDED | REG_NEWLINE) != 0) {
+ goto cleanup;
+ }
+
+ dir = opendir(dirname);
+ if(dir == NULL) {
+ _alpm_log(handle, ALPM_LOG_ERROR, _("could not open directory: %s: %s\n"),
+ dirname, strerror(errno));
+ goto cleanup;
+ }
+
+ while((ent = readdir(dir)) != NULL) {
+ if(strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) {
+ continue;
+ }
+
+ if(regexec(&reg, ent->d_name, 0, 0, 0) == 0) {
+ unsigned long cur_log;
+ cur_log = strtoul(ent->d_name + basename_len + strlen(".pacsave."), NULL, 10);
+ if(cur_log > log_max) {
+ log_max = cur_log;
+ }
+ }
+ }
+
+ /* Shift pacsaves */
+ unsigned long i;
+ for(i = log_max + 1; i > 1; i--) {
+ snprintf(oldfile, PATH_MAX, "%s.pacsave.%lu", file, i-1);
+ snprintf(newfile, PATH_MAX, "%s.pacsave.%lu", file, i);
+ rename(oldfile, newfile);
+ }
+
+ snprintf(oldfile, PATH_MAX, "%s.pacsave", file);
+ if(stat(oldfile, &st) == 0) {
+ snprintf(newfile, PATH_MAX, "%s.1", oldfile);
+ rename(oldfile, newfile);
+ }
+
+ regfree(&reg);
+
+cleanup:
+ free(dirname);
+ closedir(dir);
+}
+
+
/**
* @brief Unlink a package file, backing it up if necessary.
*
@@ -399,6 +474,7 @@ static int unlink_file(alpm_handle_t *handle, alpm_pkg_t *oldpkg,
char *newpath;
size_t len = strlen(file) + 8 + 1;
MALLOC(newpath, len, RET_ERR(handle, ALPM_ERR_MEMORY, -1));
+ shift_pacsave(handle, file);
snprintf(newpath, len, "%s.pacsave", file);
if(rename(file, newpath)) {
_alpm_log(handle, ALPM_LOG_ERROR, _("could not rename %s to %s (%s)\n"),