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authorLennart Poettering <lennart@poettering.net>2014-12-26 17:10:31 +0100
committerLennart Poettering <lennart@poettering.net>2014-12-26 19:21:58 +0100
commit8620a9a32391fd74d70ddc07c9b79729ad4ec067 (patch)
tree0e541a952c8d0f232605a21194540eed06afb307 /src/import/import-gpt.c
parente9d7333468ff02fd45a8aeb957e758f641026278 (diff)
import: beef up gpt importer to optionally make writable copy of read-only vendor image
Diffstat (limited to 'src/import/import-gpt.c')
-rw-r--r--src/import/import-gpt.c269
1 files changed, 233 insertions, 36 deletions
diff --git a/src/import/import-gpt.c b/src/import/import-gpt.c
index a81efa2bba..e1c493bbe3 100644
--- a/src/import/import-gpt.c
+++ b/src/import/import-gpt.c
@@ -26,6 +26,8 @@
#include "utf8.h"
#include "curl-util.h"
#include "import-gpt.h"
+#include "strv.h"
+#include "copy.h"
typedef struct GptImportFile GptImportFile;
@@ -41,7 +43,7 @@ struct GptImportFile {
char *temp_path;
char *final_path;
char *etag;
- char *old_etag;
+ char **old_etags;
uint64_t content_length;
uint64_t written;
@@ -66,6 +68,8 @@ struct GptImport {
bool finished;
};
+#define FILENAME_ESCAPE "/.#\"\'"
+
static GptImportFile *gpt_import_file_unref(GptImportFile *f) {
if (!f)
return NULL;
@@ -86,7 +90,7 @@ static GptImportFile *gpt_import_file_unref(GptImportFile *f) {
free(f->url);
free(f->local);
free(f->etag);
- free(f->old_etag);
+ strv_free(f->old_etags);
free(f);
return NULL;
@@ -108,6 +112,108 @@ static void gpt_import_finish(GptImport *import, int error) {
sd_event_exit(import->event, error);
}
+static int gpt_import_file_make_final_path(GptImportFile *f) {
+ _cleanup_free_ char *escaped_url = NULL, *escaped_etag = NULL;
+
+ assert(f);
+
+ if (f->final_path)
+ return 0;
+
+ escaped_url = xescape(f->url, FILENAME_ESCAPE);
+ if (!escaped_url)
+ return -ENOMEM;
+
+ if (f->etag) {
+ escaped_etag = xescape(f->etag, FILENAME_ESCAPE);
+ if (!escaped_etag)
+ return -ENOMEM;
+
+ f->final_path = strjoin("/var/lib/container/.gpt-", escaped_url, ".", escaped_etag, ".gpt", NULL);
+ } else
+ f->final_path = strjoin("/var/lib/container/.gpt-", escaped_url, ".gpt", NULL);
+ if (!f->final_path)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void gpt_import_file_success(GptImportFile *f) {
+ int r;
+
+ assert(f);
+
+ f->done = true;
+
+ if (f->local) {
+ _cleanup_free_ char *tp = NULL;
+ _cleanup_close_ int dfd = -1;
+ const char *p;
+
+ if (f->disk_fd >= 0) {
+ if (lseek(f->disk_fd, SEEK_SET, 0) == (off_t) -1) {
+ r = log_error_errno(errno, "Failed to seek to beginning of vendor image: %m");
+ goto finish;
+ }
+ } else {
+ r = gpt_import_file_make_final_path(f);
+ if (r < 0) {
+ log_oom();
+ goto finish;
+ }
+
+ f->disk_fd = open(f->final_path, O_RDONLY|O_NOCTTY|O_CLOEXEC);
+ if (f->disk_fd < 0) {
+ r = log_error_errno(errno, "Failed top open vendor image: %m");
+ goto finish;
+ }
+ }
+
+ p = strappenda("/var/lib/container/", f->local, ".gpt");
+ if (f->force_local)
+ (void) rm_rf_dangerous(p, false, true, false);
+
+ r = tempfn_random(p, &tp);
+ if (r < 0) {
+ log_oom();
+ goto finish;
+ }
+
+ dfd = open(tp, O_WRONLY|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0664);
+ if (dfd < 0) {
+ r = log_error_errno(errno, "Failed to create writable copy of image: %m");
+ goto finish;
+ }
+
+ r = copy_bytes(f->disk_fd, dfd, (off_t) -1, true);
+ if (r < 0) {
+ log_error_errno(r, "Failed to make writable copy of image: %m");
+ unlink(tp);
+ goto finish;
+ }
+
+ (void) copy_times(f->disk_fd, dfd);
+ (void) copy_xattr(f->disk_fd, dfd);
+
+ dfd = safe_close(dfd);
+
+ r = rename(tp, p);
+ if (r < 0) {
+ r = log_error_errno(errno, "Failed to move writable image into place: %m");
+ unlink(tp);
+ goto finish;
+ }
+
+ log_info("Created new local image %s.", p);
+ }
+
+ f->disk_fd = safe_close(f->disk_fd);
+ r = 0;
+
+finish:
+ gpt_import_finish(f->import, r);
+}
+
static void gpt_import_curl_on_finished(CurlGlue *g, CURL *curl, CURLcode result) {
GptImportFile *f = NULL;
struct stat st;
@@ -118,7 +224,7 @@ static void gpt_import_curl_on_finished(CurlGlue *g, CURL *curl, CURLcode result
if (curl_easy_getinfo(curl, CURLINFO_PRIVATE, &f) != CURLE_OK)
return;
- if (!f)
+ if (!f || f->done)
return;
f->done = true;
@@ -135,9 +241,9 @@ static void gpt_import_curl_on_finished(CurlGlue *g, CURL *curl, CURLcode result
r = -EIO;
goto fail;
} else if (status == 304) {
- log_info("File unmodified.");
- r = 0;
- goto fail;
+ log_info("Image already downloaded. Skipping download.");
+ gpt_import_file_success(f);
+ return;
} else if (status >= 300) {
log_error("HTTP request to %s failed with code %li.", f->url, status);
r = -EIO;
@@ -162,14 +268,15 @@ static void gpt_import_curl_on_finished(CurlGlue *g, CURL *curl, CURLcode result
}
if (f->etag)
- (void) fsetxattr(f->disk_fd, "user.etag", f->etag, strlen(f->etag), XATTR_CREATE);
+ (void) fsetxattr(f->disk_fd, "user.source_etag", f->etag, strlen(f->etag), 0);
+ if (f->url)
+ (void) fsetxattr(f->disk_fd, "user.source_url", f->url, strlen(f->url), 0);
if (f->mtime != 0) {
struct timespec ut[2];
timespec_store(&ut[0], f->mtime);
ut[1] = ut[0];
-
(void) futimens(f->disk_fd, ut);
fd_setcrtime(f->disk_fd, f->mtime);
@@ -183,8 +290,6 @@ static void gpt_import_curl_on_finished(CurlGlue *g, CURL *curl, CURLcode result
/* Mark read-only */
(void) fchmod(f->disk_fd, st.st_mode & 07444);
- f->disk_fd = safe_close(f->disk_fd);
-
assert(f->temp_path);
assert(f->final_path);
@@ -194,13 +299,19 @@ static void gpt_import_curl_on_finished(CurlGlue *g, CURL *curl, CURLcode result
goto fail;
}
- r = 0;
+ free(f->temp_path);
+ f->temp_path = NULL;
+
+ log_info("Completed writing vendor image %s.", f->final_path);
+
+ gpt_import_file_success(f);
+ return;
fail:
gpt_import_finish(f->import, r);
}
-static int gpt_import_file_open_disk(GptImportFile *f) {
+static int gpt_import_file_open_disk_for_write(GptImportFile *f) {
int r;
assert(f);
@@ -208,7 +319,9 @@ static int gpt_import_file_open_disk(GptImportFile *f) {
if (f->disk_fd >= 0)
return 0;
- assert(f->final_path);
+ r = gpt_import_file_make_final_path(f);
+ if (r < 0)
+ return log_oom();
if (!f->temp_path) {
r = tempfn_random(f->final_path, &f->temp_path);
@@ -216,7 +329,7 @@ static int gpt_import_file_open_disk(GptImportFile *f) {
return log_oom();
}
- f->disk_fd = open(f->temp_path, O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC|O_WRONLY, 0644);
+ f->disk_fd = open(f->temp_path, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0644);
if (f->disk_fd < 0)
return log_error_errno(errno, "Failed to create %s: %m", f->temp_path);
@@ -232,7 +345,12 @@ static size_t gpt_import_file_write_callback(void *contents, size_t size, size_t
assert(contents);
assert(f);
- r = gpt_import_file_open_disk(f);
+ if (f->done) {
+ r = -ESTALE;
+ goto fail;
+ }
+
+ r = gpt_import_file_open_disk_for_write(f);
if (r < 0)
goto fail;
@@ -280,6 +398,11 @@ static size_t gpt_import_file_header_callback(void *contents, size_t size, size_
assert(contents);
assert(f);
+ if (f->done) {
+ r = -ESTALE;
+ goto fail;
+ }
+
r = curl_header_strdup(contents, sz, "ETag:", &etag);
if (r < 0) {
log_oom();
@@ -289,9 +412,9 @@ static size_t gpt_import_file_header_callback(void *contents, size_t size, size_
free(f->etag);
f->etag = etag;
- if (streq_ptr(f->old_etag, f->etag)) {
- log_info("Image already up to date. Finishing.");
- gpt_import_finish(f->import, 0);
+ if (strv_contains(f->old_etags, f->etag)) {
+ log_info("Image already downloaded. Skipping download.");
+ gpt_import_file_success(f);
return sz;
}
@@ -325,6 +448,79 @@ fail:
return 0;
}
+static bool etag_is_valid(const char *etag) {
+
+ if (!endswith(etag, "\""))
+ return false;
+
+ if (!startswith(etag, "\"") && !startswith(etag, "W/\""))
+ return false;
+
+ return true;
+}
+
+static int gpt_import_file_find_old_etags(GptImportFile *f) {
+ _cleanup_free_ char *escaped_url = NULL;
+ _cleanup_closedir_ DIR *d = NULL;
+ struct dirent *de;
+ int r;
+
+ escaped_url = xescape(f->url, FILENAME_ESCAPE);
+ if (!escaped_url)
+ return -ENOMEM;
+
+ d = opendir("/var/lib/container/");
+ if (!d) {
+ if (errno == ENOENT)
+ return 0;
+
+ return -errno;
+ }
+
+ FOREACH_DIRENT_ALL(de, d, return -errno) {
+ const char *a, *b;
+ char *u;
+
+ if (de->d_type != DT_UNKNOWN &&
+ de->d_type != DT_REG)
+ continue;
+
+ a = startswith(de->d_name, ".gpt-");
+ if (!a)
+ continue;
+
+ a = startswith(a, escaped_url);
+ if (!a)
+ continue;
+
+ a = startswith(a, ".");
+ if (!a)
+ continue;
+
+ b = endswith(de->d_name, ".gpt");
+ if (!b)
+ continue;
+
+ if (a >= b)
+ continue;
+
+ u = cunescape_length(a, b - a);
+ if (!u)
+ return -ENOMEM;
+
+ if (!etag_is_valid(u)) {
+ free(u);
+ continue;
+ }
+
+ r = strv_consume(&f->old_etags, u);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
static int gpt_import_file_begin(GptImportFile *f) {
int r;
@@ -333,14 +529,24 @@ static int gpt_import_file_begin(GptImportFile *f) {
log_info("Getting %s.", f->url);
+ r = gpt_import_file_find_old_etags(f);
+ if (r < 0)
+ return r;
+
r = curl_glue_make(&f->curl, f->url, f);
if (r < 0)
return r;
- if (f->old_etag) {
- const char *hdr;
+ if (!strv_isempty(f->old_etags)) {
+ _cleanup_free_ char *cc = NULL, *hdr = NULL;
- hdr = strappenda("If-None-Match: ", f->old_etag);
+ cc = strv_join(f->old_etags, ", ");
+ if (!cc)
+ return -ENOMEM;
+
+ hdr = strappend("If-None-Match: ", cc);
+ if (!hdr)
+ return -ENOMEM;
f->request_header = curl_slist_new(hdr, NULL);
if (!f->request_header)
@@ -437,13 +643,11 @@ int gpt_import_cancel(GptImport *import, const char *url) {
int gpt_import_pull(GptImport *import, const char *url, const char *local, bool force_local) {
_cleanup_(gpt_import_file_unrefp) GptImportFile *f = NULL;
- char etag[LINE_MAX];
- ssize_t n;
int r;
assert(import);
assert(gpt_url_is_valid(url));
- assert(machine_name_is_valid(local));
+ assert(!local || machine_name_is_valid(local));
if (hashmap_get(import->files, url))
return -EEXIST;
@@ -464,19 +668,12 @@ int gpt_import_pull(GptImport *import, const char *url, const char *local, bool
if (!f->url)
return -ENOMEM;
- f->local = strdup(local);
- if (!f->local)
- return -ENOMEM;
-
- f->final_path = strjoin("/var/lib/container/", local, ".gpt", NULL);
- if (!f->final_path)
- return -ENOMEM;
-
- n = getxattr(f->final_path, "user.etag", etag, sizeof(etag));
- if (n > 0) {
- f->old_etag = strndup(etag, n);
- if (!f->old_etag)
+ if (local) {
+ f->local = strdup(local);
+ if (!f->local)
return -ENOMEM;
+
+ f->force_local = force_local;
}
r = hashmap_put(import->files, f->url, f);