import: add support for pulling raw tar balls as containers

Ubuntu provides their cloud images optionally as tarball, hence also
support downloading those.

1 files changed, 629 insertions, 0 deletions

diff --git a/src/import/import-job.c b/src/import/import-job.c
new file mode 100644
index 0000000000..5a4ea69cb2
--- /dev/null
+++ b/src/import/import-job.c
@@ -0,0 +1,629 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2015 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/xattr.h>
+
+#include "strv.h"
+#include "import-job.h"
+
+ImportJob* import_job_unref(ImportJob *j) {
+        if (!j)
+                return NULL;
+
+        curl_glue_remove_and_free(j->glue, j->curl);
+        curl_slist_free_all(j->request_header);
+
+        safe_close(j->disk_fd);
+
+        if (j->compressed == IMPORT_JOB_XZ)
+                lzma_end(&j->xz);
+        else if (j->compressed == IMPORT_JOB_GZIP)
+                inflateEnd(&j->gzip);
+
+        free(j->url);
+        free(j->etag);
+        strv_free(j->old_etags);
+        free(j->payload);
+
+        free(j);
+
+        return NULL;
+}
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(ImportJob*, import_job_unref);
+
+static void import_job_finish(ImportJob *j, int ret) {
+        assert(j);
+
+        if (j->state == IMPORT_JOB_DONE ||
+            j->state == IMPORT_JOB_FAILED)
+                return;
+
+        if (ret == 0)
+                j->state = IMPORT_JOB_DONE;
+        else {
+                j->state = IMPORT_JOB_FAILED;
+                j->error = ret;
+        }
+
+        if (j->on_finished)
+                j->on_finished(j);
+}
+
+void import_job_curl_on_finished(CurlGlue *g, CURL *curl, CURLcode result) {
+        ImportJob *j = NULL;
+        CURLcode code;
+        long status;
+        int r;
+
+        if (curl_easy_getinfo(curl, CURLINFO_PRIVATE, &j) != CURLE_OK)
+                return;
+
+        if (!j || j->state == IMPORT_JOB_DONE || j->state == IMPORT_JOB_FAILED)
+                return;
+
+        if (result != CURLE_OK) {
+                log_error("Transfer failed: %s", curl_easy_strerror(result));
+                r = -EIO;
+                goto finish;
+        }
+
+        code = curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &status);
+        if (code != CURLE_OK) {
+                log_error("Failed to retrieve response code: %s", curl_easy_strerror(code));
+                r = -EIO;
+                goto finish;
+        } else if (status == 304) {
+                log_info("Image already downloaded. Skipping download.");
+                r = 0;
+                goto finish;
+        } else if (status >= 300) {
+                log_error("HTTP request to %s failed with code %li.", j->url, status);
+                r = -EIO;
+                goto finish;
+        } else if (status < 200) {
+                log_error("HTTP request to %s finished with unexpected code %li.", j->url, status);
+                r = -EIO;
+                goto finish;
+        }
+
+        if (j->state != IMPORT_JOB_RUNNING) {
+                log_error("Premature connection termination.");
+                r = -EIO;
+                goto finish;
+        }
+
+        if (j->content_length != (uint64_t) -1 &&
+            j->content_length != j->written_compressed) {
+                log_error("Download truncated.");
+                r = -EIO;
+                goto finish;
+        }
+
+        if (j->disk_fd >= 0 && j->allow_sparse) {
+                /* Make sure the file size is right, in case the file was
+                 * sparse and we just seeked for the last part */
+
+                if (ftruncate(j->disk_fd, j->written_uncompressed) < 0) {
+                        log_error_errno(errno, "Failed to truncate file: %m");
+                        r = -errno;
+                        goto finish;
+                }
+
+                if (j->etag)
+                        (void) fsetxattr(j->disk_fd, "user.source_etag", j->etag, strlen(j->etag), 0);
+                if (j->url)
+                        (void) fsetxattr(j->disk_fd, "user.source_url", j->url, strlen(j->url), 0);
+
+                if (j->mtime != 0) {
+                        struct timespec ut[2];
+
+                        timespec_store(&ut[0], j->mtime);
+                        ut[1] = ut[0];
+                        (void) futimens(j->disk_fd, ut);
+
+                        (void) fd_setcrtime(j->disk_fd, j->mtime);
+                }
+        }
+
+        r = 0;
+
+finish:
+        import_job_finish(j, r);
+}
+
+
+static int import_job_write_uncompressed(ImportJob *j, void *p, size_t sz) {
+        ssize_t n;
+
+        assert(j);
+        assert(p);
+        assert(sz > 0);
+        assert(j->disk_fd >= 0);
+
+        if (j->written_uncompressed + sz < j->written_uncompressed) {
+                log_error("File too large, overflow");
+                return -EOVERFLOW;
+        }
+
+        if (j->written_uncompressed + sz > j->uncompressed_max) {
+                log_error("File overly large, refusing");
+                return -EFBIG;
+        }
+
+        if (j->disk_fd >= 0) {
+
+                if (j->allow_sparse)
+                        n = sparse_write(j->disk_fd, p, sz, 64);
+                else
+                        n = write(j->disk_fd, p, sz);
+                if (n < 0) {
+                        log_error_errno(errno, "Failed to write file: %m");
+                        return -errno;
+                }
+                if ((size_t) n < sz) {
+                        log_error("Short write");
+                        return -EIO;
+                }
+        } else {
+
+                if (!GREEDY_REALLOC(j->payload, j->payload_allocated, j->payload_size + sz))
+                        return log_oom();
+
+                memcpy((uint8_t*) j->payload + j->payload_size, p, sz);
+                j->payload_size += sz;
+        }
+
+        j->written_uncompressed += sz;
+
+        return 0;
+}
+
+static int import_job_write_compressed(ImportJob *j, void *p, size_t sz) {
+        int r;
+
+        assert(j);
+        assert(p);
+        assert(sz > 0);
+        assert(j->disk_fd >= 0);
+
+        if (j->written_compressed + sz < j->written_compressed) {
+                log_error("File too large, overflow");
+                return -EOVERFLOW;
+        }
+
+        if (j->written_compressed + sz > j->compressed_max) {
+                log_error("File overly large, refusing.");
+                return -EFBIG;
+        }
+
+        if (j->content_length != (uint64_t) -1 &&
+            j->written_compressed + sz > j->content_length) {
+                log_error("Content length incorrect.");
+                return -EFBIG;
+        }
+
+        switch (j->compressed) {
+
+        case IMPORT_JOB_UNCOMPRESSED:
+                r = import_job_write_uncompressed(j, p, sz);
+                if (r < 0)
+                        return r;
+
+                break;
+
+        case IMPORT_JOB_XZ:
+                j->xz.next_in = p;
+                j->xz.avail_in = sz;
+
+                while (j->xz.avail_in > 0) {
+                        uint8_t buffer[16 * 1024];
+                        lzma_ret lzr;
+
+                        j->xz.next_out = buffer;
+                        j->xz.avail_out = sizeof(buffer);
+
+                        lzr = lzma_code(&j->xz, LZMA_RUN);
+                        if (lzr != LZMA_OK && lzr != LZMA_STREAM_END) {
+                                log_error("Decompression error.");
+                                return -EIO;
+                        }
+
+                        r = import_job_write_uncompressed(j, buffer, sizeof(buffer) - j->xz.avail_out);
+                        if (r < 0)
+                                return r;
+                }
+
+                break;
+
+        case IMPORT_JOB_GZIP:
+                j->gzip.next_in = p;
+                j->gzip.avail_in = sz;
+
+                while (j->gzip.avail_in > 0) {
+                        uint8_t buffer[16 * 1024];
+
+                        j->gzip.next_out = buffer;
+                        j->gzip.avail_out = sizeof(buffer);
+
+                        r = inflate(&j->gzip, Z_NO_FLUSH);
+                        if (r != Z_OK && r != Z_STREAM_END) {
+                                log_error("Decompression error.");
+                                return -EIO;
+                        }
+
+                        r = import_job_write_uncompressed(j, buffer, sizeof(buffer) - j->gzip.avail_out);
+                        if (r < 0)
+                                return r;
+                }
+
+                break;
+
+        default:
+                assert_not_reached("Unknown compression");
+        }
+
+        j->written_compressed += sz;
+
+        return 0;
+}
+
+static int import_job_open_disk(ImportJob *j) {
+        int r;
+
+        assert(j);
+
+        if (j->on_open_disk) {
+                r = j->on_open_disk(j);
+                if (r < 0)
+                        return r;
+        }
+
+        if (j->disk_fd >= 0) {
+                /* Check if we can do sparse files */
+
+                if (lseek(j->disk_fd, SEEK_SET, 0) == 0)
+                        j->allow_sparse = true;
+                else {
+                        if (errno != ESPIPE)
+                                return log_error_errno(errno, "Failed to seek on file descriptor: %m");
+
+                        j->allow_sparse = false;
+                }
+        }
+
+        return 0;
+}
+
+static int import_job_detect_compression(ImportJob *j) {
+        static const uint8_t xz_signature[] = {
+                0xfd, '7', 'z', 'X', 'Z', 0x00
+        };
+        static const uint8_t gzip_signature[] = {
+                0x1f, 0x8b
+        };
+
+        _cleanup_free_ uint8_t *stub = NULL;
+        size_t stub_size;
+
+        int r;
+
+        assert(j);
+
+        if (j->payload_size < MAX(sizeof(xz_signature), sizeof(gzip_signature)))
+                return 0;
+
+        if (memcmp(j->payload, xz_signature, sizeof(xz_signature)) == 0)
+                j->compressed = IMPORT_JOB_XZ;
+        else if (memcmp(j->payload, gzip_signature, sizeof(gzip_signature)) == 0)
+                j->compressed = IMPORT_JOB_GZIP;
+        else
+                j->compressed = IMPORT_JOB_UNCOMPRESSED;
+
+        log_debug("Stream is XZ compressed: %s", yes_no(j->compressed == IMPORT_JOB_XZ));
+        log_debug("Stream is GZIP compressed: %s", yes_no(j->compressed == IMPORT_JOB_GZIP));
+
+        if (j->compressed == IMPORT_JOB_XZ) {
+                lzma_ret xzr;
+
+                xzr = lzma_stream_decoder(&j->xz, UINT64_MAX, LZMA_TELL_UNSUPPORTED_CHECK);
+                if (xzr != LZMA_OK) {
+                        log_error("Failed to initialize XZ decoder.");
+                        return -EIO;
+                }
+        }
+        if (j->compressed == IMPORT_JOB_GZIP) {
+                r = inflateInit2(&j->gzip, 15+16);
+                if (r != Z_OK) {
+                        log_error("Failed to initialize gzip decoder.");
+                        return -EIO;
+                }
+        }
+
+        r = import_job_open_disk(j);
+        if (r < 0)
+                return r;
+
+        /* Now, take the payload we read so far, and decompress it */
+        stub = j->payload;
+        stub_size = j->payload_size;
+
+        j->payload = NULL;
+        j->payload_size = 0;
+
+        j->state = IMPORT_JOB_RUNNING;
+
+        r = import_job_write_compressed(j, stub, stub_size);
+        if (r < 0)
+                return r;
+
+        return 0;
+}
+
+static size_t import_job_write_callback(void *contents, size_t size, size_t nmemb, void *userdata) {
+        ImportJob *j = userdata;
+        size_t sz = size * nmemb;
+        int r;
+
+        assert(contents);
+        assert(j);
+
+        switch (j->state) {
+
+        case IMPORT_JOB_ANALYZING:
+                /* Let's first check what it actually is */
+
+                if (!GREEDY_REALLOC(j->payload, j->payload_allocated, j->payload_size + sz)) {
+                        r = log_oom();
+                        goto fail;
+                }
+
+                memcpy((uint8_t*) j->payload + j->payload_size, contents, sz);
+                j->payload_size += sz;
+
+                r = import_job_detect_compression(j);
+                if (r < 0)
+                        goto fail;
+
+                break;
+
+        case IMPORT_JOB_RUNNING:
+
+                r = import_job_write_compressed(j, contents, sz);
+                if (r < 0)
+                        goto fail;
+
+                break;
+
+        case IMPORT_JOB_DONE:
+        case IMPORT_JOB_FAILED:
+                r = -ESTALE;
+                goto fail;
+
+        default:
+                assert_not_reached("Impossible state.");
+        }
+
+        return sz;
+
+fail:
+        import_job_finish(j, r);
+        return 0;
+}
+
+static size_t import_job_header_callback(void *contents, size_t size, size_t nmemb, void *userdata) {
+        ImportJob *j = userdata;
+        size_t sz = size * nmemb;
+        _cleanup_free_ char *length = NULL, *last_modified = NULL;
+        char *etag;
+        int r;
+
+        assert(contents);
+        assert(j);
+
+        if (j->state == IMPORT_JOB_DONE || j->state == IMPORT_JOB_FAILED) {
+                r = -ESTALE;
+                goto fail;
+        }
+
+        assert(j->state == IMPORT_JOB_ANALYZING);
+
+        r = curl_header_strdup(contents, sz, "ETag:", &etag);
+        if (r < 0) {
+                log_oom();
+                goto fail;
+        }
+        if (r > 0) {
+                free(j->etag);
+                j->etag = etag;
+
+                if (strv_contains(j->old_etags, j->etag)) {
+                        log_info("Image already downloaded. Skipping download.");
+                        import_job_finish(j, 0);
+                        return sz;
+                }
+
+                return sz;
+        }
+
+        r = curl_header_strdup(contents, sz, "Content-Length:", &length);
+        if (r < 0) {
+                log_oom();
+                goto fail;
+        }
+        if (r > 0) {
+                (void) safe_atou64(length, &j->content_length);
+
+                if (j->content_length != (uint64_t) -1) {
+                        char bytes[FORMAT_BYTES_MAX];
+
+                        if (j->content_length > j->compressed_max) {
+                                log_error("Content too large.");
+                                r = -EFBIG;
+                                goto fail;
+                        }
+
+                        log_info("Downloading %s.", format_bytes(bytes, sizeof(bytes), j->content_length));
+                }
+
+                return sz;
+        }
+
+        r = curl_header_strdup(contents, sz, "Last-Modified:", &last_modified);
+        if (r < 0) {
+                log_oom();
+                goto fail;
+        }
+        if (r > 0) {
+                (void) curl_parse_http_time(last_modified, &j->mtime);
+                return sz;
+        }
+
+        return sz;
+
+fail:
+        import_job_finish(j, r);
+        return 0;
+}
+
+static int import_job_progress_callback(void *userdata, curl_off_t dltotal, curl_off_t dlnow, curl_off_t ultotal, curl_off_t ulnow) {
+        ImportJob *j = userdata;
+        unsigned percent;
+        usec_t n;
+
+        assert(j);
+
+        if (dltotal <= 0)
+                return 0;
+
+        percent = ((100 * dlnow) / dltotal);
+        n = now(CLOCK_MONOTONIC);
+
+        if (n > j->last_status_usec + USEC_PER_SEC &&
+            percent != j->progress_percent) {
+                char buf[FORMAT_TIMESPAN_MAX];
+
+                if (n - j->start_usec > USEC_PER_SEC && dlnow > 0) {
+                        usec_t left, done;
+
+                        done = n - j->start_usec;
+                        left = (usec_t) (((double) done * (double) dltotal) / dlnow) - done;
+
+                        log_info("Got %u%% of %s. %s left.", percent, j->url, format_timespan(buf, sizeof(buf), left, USEC_PER_SEC));
+                } else
+                        log_info("Got %u%% of %s.", percent, j->url);
+
+                j->progress_percent = percent;
+                j->last_status_usec = n;
+        }
+
+        return 0;
+}
+
+int import_job_new(ImportJob **ret, const char *url, CurlGlue *glue, void *userdata) {
+        _cleanup_(import_job_unrefp) ImportJob *j = NULL;
+
+        assert(url);
+        assert(glue);
+        assert(ret);
+
+        j = new0(ImportJob, 1);
+        if (!j)
+                return -ENOMEM;
+
+        j->state = IMPORT_JOB_INIT;
+        j->disk_fd = -1;
+        j->userdata = userdata;
+        j->glue = glue;
+        j->content_length = (uint64_t) -1;
+        j->start_usec = now(CLOCK_MONOTONIC);
+        j->compressed_max = j->uncompressed_max = 8LLU * 1024LLU * 1024LLU * 1024LLU; /* 8GB */
+
+        j->url = strdup(url);
+        if (!j->url)
+                return -ENOMEM;
+
+        *ret = j;
+        j = NULL;
+
+        return 0;
+}
+
+int import_job_begin(ImportJob *j) {
+        int r;
+
+        assert(j);
+
+        if (j->state != IMPORT_JOB_INIT)
+                return -EBUSY;
+
+        r = curl_glue_make(&j->curl, j->url, j);
+        if (r < 0)
+                return r;
+
+        if (!strv_isempty(j->old_etags)) {
+                _cleanup_free_ char *cc = NULL, *hdr = NULL;
+
+                cc = strv_join(j->old_etags, ", ");
+                if (!cc)
+                        return -ENOMEM;
+
+                hdr = strappend("If-None-Match: ", cc);
+                if (!hdr)
+                        return -ENOMEM;
+
+                j->request_header = curl_slist_new(hdr, NULL);
+                if (!j->request_header)
+                        return -ENOMEM;
+
+                if (curl_easy_setopt(j->curl, CURLOPT_HTTPHEADER, j->request_header) != CURLE_OK)
+                        return -EIO;
+        }
+
+        if (curl_easy_setopt(j->curl, CURLOPT_WRITEFUNCTION, import_job_write_callback) != CURLE_OK)
+                return -EIO;
+
+        if (curl_easy_setopt(j->curl, CURLOPT_WRITEDATA, j) != CURLE_OK)
+                return -EIO;
+
+        if (curl_easy_setopt(j->curl, CURLOPT_HEADERFUNCTION, import_job_header_callback) != CURLE_OK)
+                return -EIO;
+
+        if (curl_easy_setopt(j->curl, CURLOPT_HEADERDATA, j) != CURLE_OK)
+                return -EIO;
+
+        if (curl_easy_setopt(j->curl, CURLOPT_XFERINFOFUNCTION, import_job_progress_callback) != CURLE_OK)
+                return -EIO;
+
+        if (curl_easy_setopt(j->curl, CURLOPT_XFERINFODATA, j) != CURLE_OK)
+                return -EIO;
+
+        if (curl_easy_setopt(j->curl, CURLOPT_NOPROGRESS, 0) != CURLE_OK)
+                return -EIO;
+
+        r = curl_glue_add(j->glue, j->curl);
+        if (r < 0)
+                return r;
+
+        j->state = IMPORT_JOB_ANALYZING;
+
+        return 0;
+}