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+Date: Fri, 4 Apr 2014 18:05:47 -0400\r
+From: Austin Clements <amdragon@MIT.EDU>\r
+To: David Bremner <david@tethera.net>\r
+Subject: Re: [Patch v6 1/6] dump: support gzipped and atomic output\r
+Message-ID: <20140404220547.GB15472@mit.edu>\r
+References: <1396554083-3892-1-git-send-email-david@tethera.net>\r
+ <1396554083-3892-2-git-send-email-david@tethera.net>\r
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+\r
+Quoth David Bremner on Apr 03 at 4:41 pm:\r
+> The main goal is to support gzipped output for future internal\r
+> calls (e.g. from notmuch-new) to notmuch_database_dump.\r
+> \r
+> The additional dependency is not very heavy since xapian already pulls\r
+> in zlib.\r
+> \r
+> We want the dump to be "atomic", in the sense that after running the\r
+> dump file is either present and complete, or not present. This avoids\r
+> certain classes of mishaps involving overwriting a good backup with a\r
+> bad or partial one.\r
+> ---\r
+> INSTALL | 20 ++++++++--\r
+> Makefile.local | 2 +-\r
+> configure | 28 ++++++++++++--\r
+> doc/man1/notmuch-dump.rst | 3 ++\r
+> notmuch-client.h | 4 +-\r
+> notmuch-dump.c | 95 +++++++++++++++++++++++++++++++++++++----------\r
+> test/T240-dump-restore.sh | 12 ++++++\r
+> 7 files changed, 136 insertions(+), 28 deletions(-)\r
+> \r
+> diff --git a/INSTALL b/INSTALL\r
+> index 690b0ef..b543c50 100644\r
+> --- a/INSTALL\r
+> +++ b/INSTALL\r
+> @@ -20,8 +20,8 @@ configure stage.\r
+> \r
+> Dependencies\r
+> ------------\r
+> -Notmuch depends on three libraries: Xapian, GMime 2.4 or 2.6, and\r
+> -Talloc which are each described below:\r
+> +Notmuch depends on four libraries: Xapian, GMime 2.4 or 2.6,\r
+> +Talloc, and zlib which are each described below:\r
+> \r
+> Xapian\r
+> ------\r
+> @@ -60,6 +60,18 @@ Talloc which are each described below:\r
+> \r
+> Talloc is available from http://talloc.samba.org/\r
+> \r
+> + zlib\r
+> + ----\r
+> +\r
+> + zlib is an extremely popular compression library. It is used\r
+> + by Xapian, so if you installed that you will already have\r
+> + zlib. You may need to install the zlib headers separately.\r
+> +\r
+> + Notmuch needs the transparent write feature of zlib introduced\r
+> + in version 1.2.5.2 (Dec. 2011).\r
+> +\r
+> + zlib is available from http://zlib.net\r
+> +\r
+> Building Documentation\r
+> ----------------------\r
+> \r
+> @@ -79,11 +91,11 @@ dependencies with a simple simple command line. For example:\r
+> \r
+> For Debian and similar:\r
+> \r
+> - sudo apt-get install libxapian-dev libgmime-2.6-dev libtalloc-dev python-sphinx\r
+> + sudo apt-get install libxapian-dev libgmime-2.6-dev libtalloc-dev zlib1g-dev python-sphinx\r
+> \r
+> For Fedora and similar:\r
+> \r
+> - sudo yum install xapian-core-devel gmime-devel libtalloc-devel python-sphinx\r
+> + sudo yum install xapian-core-devel gmime-devel libtalloc-devel zlib-devel python-sphinx\r
+> \r
+> On other systems, a similar command can be used, but the details of\r
+> the package names may be different.\r
+> diff --git a/Makefile.local b/Makefile.local\r
+> index cb7b106..e5a20a7 100644\r
+> --- a/Makefile.local\r
+> +++ b/Makefile.local\r
+> @@ -41,7 +41,7 @@ PV_FILE=bindings/python/notmuch/version.py\r
+> # Smash together user's values with our extra values\r
+> FINAL_CFLAGS = -DNOTMUCH_VERSION=$(VERSION) $(CPPFLAGS) $(CFLAGS) $(WARN_CFLAGS) $(extra_cflags) $(CONFIGURE_CFLAGS)\r
+> FINAL_CXXFLAGS = $(CPPFLAGS) $(CXXFLAGS) $(WARN_CXXFLAGS) $(extra_cflags) $(extra_cxxflags) $(CONFIGURE_CXXFLAGS)\r
+> -FINAL_NOTMUCH_LDFLAGS = $(LDFLAGS) -Lutil -lutil -Llib -lnotmuch $(AS_NEEDED_LDFLAGS) $(GMIME_LDFLAGS) $(TALLOC_LDFLAGS)\r
+> +FINAL_NOTMUCH_LDFLAGS = $(LDFLAGS) -Lutil -lutil -Llib -lnotmuch $(AS_NEEDED_LDFLAGS) $(GMIME_LDFLAGS) $(TALLOC_LDFLAGS) $(ZLIB_LDFLAGS)\r
+> FINAL_NOTMUCH_LINKER = CC\r
+> ifneq ($(LINKER_RESOLVES_LIBRARY_DEPENDENCIES),1)\r
+> FINAL_NOTMUCH_LDFLAGS += $(CONFIGURE_LDFLAGS)\r
+> diff --git a/configure b/configure\r
+> index 1d430b9..1d624f7 100755\r
+> --- a/configure\r
+> +++ b/configure\r
+> @@ -340,6 +340,18 @@ else\r
+> errors=$((errors + 1))\r
+> fi\r
+> \r
+> +printf "Checking for zlib (>= 1.2.5.2)... "\r
+> +have_zlib=0\r
+> +if pkg-config --atleast-version=1.2.5.2 zlib; then\r
+> + printf "Yes.\n"\r
+> + have_zlib=1\r
+> + zlib_cflags=$(pkg-config --cflags zlib)\r
+> + zlib_ldflags=$(pkg-config --libs zlib)\r
+> +else\r
+> + printf "No.\n"\r
+> + errors=$((errors + 1))\r
+> +fi\r
+> +\r
+> printf "Checking for talloc development files... "\r
+> if pkg-config --exists talloc; then\r
+> printf "Yes.\n"\r
+> @@ -496,6 +508,11 @@ EOF\r
+> echo " Xapian library (including development files such as headers)"\r
+> echo " http://xapian.org/"\r
+> fi\r
+> + if [ $have_zlib -eq 0 ]; then\r
+> + echo " zlib library (including development files such as headers)"\r
+> + echo " http://zlib.net/"\r
+> + echo\r
+> + fi\r
+> if [ $have_gmime -eq 0 ]; then\r
+> echo " Either GMime 2.4 library" $GMIME_24_VERSION_CTR "or GMime 2.6 library" $GMIME_26_VERSION_CTR\r
+> echo " (including development files such as headers)"\r
+> @@ -519,11 +536,11 @@ case a simple command will install everything you need. For example:\r
+> \r
+> On Debian and similar systems:\r
+> \r
+> - sudo apt-get install libxapian-dev libgmime-2.6-dev libtalloc-dev\r
+> + sudo apt-get install libxapian-dev libgmime-2.6-dev libtalloc-dev zlib1g-dev\r
+> \r
+> Or on Fedora and similar systems:\r
+> \r
+> - sudo yum install xapian-core-devel gmime-devel libtalloc-devel\r
+> + sudo yum install xapian-core-devel gmime-devel libtalloc-devel zlib-devel\r
+> \r
+> On other systems, similar commands can be used, but the details of the\r
+> package names may be different.\r
+> @@ -844,6 +861,10 @@ XAPIAN_LDFLAGS = ${xapian_ldflags}\r
+> GMIME_CFLAGS = ${gmime_cflags}\r
+> GMIME_LDFLAGS = ${gmime_ldflags}\r
+> \r
+> +# Flags needed to compile and link against zlib\r
+> +ZLIB_CFLAGS = ${zlib_cflags}\r
+> +ZLIB_LDFLAGS = ${zlib_ldflags}\r
+> +\r
+> # Flags needed to compile and link against talloc\r
+> TALLOC_CFLAGS = ${talloc_cflags}\r
+> TALLOC_LDFLAGS = ${talloc_ldflags}\r
+> @@ -882,6 +903,7 @@ CONFIGURE_CFLAGS = -DHAVE_GETLINE=\$(HAVE_GETLINE) \$(GMIME_CFLAGS) \\\r
+> -DUTIL_BYTE_ORDER=\$(UTIL_BYTE_ORDER)\r
+> \r
+> CONFIGURE_CXXFLAGS = -DHAVE_GETLINE=\$(HAVE_GETLINE) \$(GMIME_CFLAGS) \\\r
+> + \$(ZLIB_CFLAGS) \\\r
+> \$(TALLOC_CFLAGS) -DHAVE_VALGRIND=\$(HAVE_VALGRIND) \\\r
+> \$(VALGRIND_CFLAGS) \$(XAPIAN_CXXFLAGS) \\\r
+> -DHAVE_STRCASESTR=\$(HAVE_STRCASESTR) \\\r
+> @@ -892,5 +914,5 @@ CONFIGURE_CXXFLAGS = -DHAVE_GETLINE=\$(HAVE_GETLINE) \$(GMIME_CFLAGS) \\\r
+> -DHAVE_XAPIAN_COMPACT=\$(HAVE_XAPIAN_COMPACT) \\\r
+> -DUTIL_BYTE_ORDER=\$(UTIL_BYTE_ORDER)\r
+> \r
+> -CONFIGURE_LDFLAGS = \$(GMIME_LDFLAGS) \$(TALLOC_LDFLAGS) \$(XAPIAN_LDFLAGS)\r
+> +CONFIGURE_LDFLAGS = \$(GMIME_LDFLAGS) \$(TALLOC_LDFLAGS) \$(ZLIB_LDFLAGS) \$(XAPIAN_LDFLAGS)\r
+> EOF\r
+> diff --git a/doc/man1/notmuch-dump.rst b/doc/man1/notmuch-dump.rst\r
+> index 17d1da5..d94cb4f 100644\r
+> --- a/doc/man1/notmuch-dump.rst\r
+> +++ b/doc/man1/notmuch-dump.rst\r
+> @@ -19,6 +19,9 @@ recreated from the messages themselves. The output of notmuch dump is\r
+> therefore the only critical thing to backup (and much more friendly to\r
+> incremental backup than the native database files.)\r
+> \r
+> +``--gzip``\r
+> + Compress the output in a format compatible with **gzip(1)**.\r
+> +\r
+> ``--format=(sup|batch-tag)``\r
+> Notmuch restore supports two plain text dump formats, both with one\r
+> message-id per line, followed by a list of tags.\r
+> diff --git a/notmuch-client.h b/notmuch-client.h\r
+> index d110648..e1efbe0 100644\r
+> --- a/notmuch-client.h\r
+> +++ b/notmuch-client.h\r
+> @@ -450,7 +450,9 @@ typedef enum dump_formats {\r
+> int\r
+> notmuch_database_dump (notmuch_database_t *notmuch,\r
+> const char *output_file_name,\r
+> - const char *query_str, dump_format_t output_format);\r
+> + const char *query_str,\r
+> + dump_format_t output_format,\r
+> + notmuch_bool_t gzip_output);\r
+> \r
+> #include "command-line-arguments.h"\r
+> #endif\r
+> diff --git a/notmuch-dump.c b/notmuch-dump.c\r
+> index 21702d7..2a7252a 100644\r
+> --- a/notmuch-dump.c\r
+> +++ b/notmuch-dump.c\r
+> @@ -21,9 +21,11 @@\r
+> #include "notmuch-client.h"\r
+> #include "hex-escape.h"\r
+> #include "string-util.h"\r
+> +#include <zlib.h>\r
+> +\r
+> \r
+> static int\r
+> -database_dump_file (notmuch_database_t *notmuch, FILE *output,\r
+> +database_dump_file (notmuch_database_t *notmuch, gzFile output,\r
+> const char *query_str, int output_format)\r
+> {\r
+> notmuch_query_t *query;\r
+> @@ -69,7 +71,7 @@ database_dump_file (notmuch_database_t *notmuch, FILE *output,\r
+> }\r
+> \r
+> if (output_format == DUMP_FORMAT_SUP) {\r
+> - fprintf (output, "%s (", message_id);\r
+> + gzprintf (output, "%s (", message_id);\r
+> }\r
+> \r
+> for (tags = notmuch_message_get_tags (message);\r
+> @@ -78,12 +80,12 @@ database_dump_file (notmuch_database_t *notmuch, FILE *output,\r
+> const char *tag_str = notmuch_tags_get (tags);\r
+> \r
+> if (! first)\r
+> - fputs (" ", output);\r
+> + gzputs (output, " ");\r
+> \r
+> first = 0;\r
+> \r
+> if (output_format == DUMP_FORMAT_SUP) {\r
+> - fputs (tag_str, output);\r
+> + gzputs (output, tag_str);\r
+> } else {\r
+> if (hex_encode (notmuch, tag_str,\r
+> &buffer, &buffer_size) != HEX_SUCCESS) {\r
+> @@ -91,12 +93,12 @@ database_dump_file (notmuch_database_t *notmuch, FILE *output,\r
+> tag_str);\r
+> return EXIT_FAILURE;\r
+> }\r
+> - fprintf (output, "+%s", buffer);\r
+> + gzprintf (output, "+%s", buffer);\r
+> }\r
+> }\r
+> \r
+> if (output_format == DUMP_FORMAT_SUP) {\r
+> - fputs (")\n", output);\r
+> + gzputs (output, ")\n");\r
+> } else {\r
+> if (make_boolean_term (notmuch, "id", message_id,\r
+> &buffer, &buffer_size)) {\r
+> @@ -104,7 +106,7 @@ database_dump_file (notmuch_database_t *notmuch, FILE *output,\r
+> message_id, strerror (errno));\r
+> return EXIT_FAILURE;\r
+> }\r
+> - fprintf (output, " -- %s\n", buffer);\r
+> + gzprintf (output, " -- %s\n", buffer);\r
+> }\r
+> \r
+> notmuch_message_destroy (message);\r
+> @@ -121,24 +123,77 @@ database_dump_file (notmuch_database_t *notmuch, FILE *output,\r
+> int\r
+> notmuch_database_dump (notmuch_database_t *notmuch,\r
+> const char *output_file_name,\r
+> - const char *query_str, dump_format_t output_format)\r
+> + const char *query_str,\r
+> + dump_format_t output_format,\r
+> + notmuch_bool_t gzip_output)\r
+> {\r
+> - FILE *output = stdout;\r
+> - int ret;\r
+> + gzFile output;\r
+\r
+This should to gzclose_w output on all error paths. The easiest way\r
+to do that it probably to\r
+ gzFile output = NULL;\r
+here and ...\r
+\r
+> + const char *mode = gzip_output ? "w9" : "wT";\r
+> + const char *name_for_error = output_file_name ? output_file_name : "stdout";\r
+> +\r
+> + char *tempname = NULL;\r
+> + int outfd = -1;\r
+> +\r
+> + int ret = -1;\r
+> \r
+> if (output_file_name) {\r
+> - output = fopen (output_file_name, "w");\r
+> - if (output == NULL) {\r
+> - fprintf (stderr, "Error opening %s for writing: %s\n",\r
+> - output_file_name, strerror (errno));\r
+> - return EXIT_FAILURE;\r
+> - }\r
+> + tempname = talloc_asprintf (notmuch, "%s.XXXXXX", output_file_name);\r
+> + outfd = mkstemp (tempname);\r
+> + } else {\r
+> + outfd = dup (STDOUT_FILENO);\r
+> + }\r
+> +\r
+> + if (outfd < 0) {\r
+> + fprintf (stderr, "Bad output file %s\n", name_for_error);\r
+> + goto DONE;\r
+> + }\r
+> +\r
+> + output = gzdopen (outfd, mode);\r
+> +\r
+> + if (output == NULL) {\r
+> + fprintf (stderr, "Error opening %s for (gzip) writing: %s\n",\r
+> + name_for_error, strerror (errno));\r
+> + if (close (outfd))\r
+> + fprintf (stderr, "Error closing %s during shutdown: %s\n",\r
+> + name_for_error, strerror (errno));\r
+> + goto DONE;\r
+> }\r
+> \r
+> ret = database_dump_file (notmuch, output, query_str, output_format);\r
+> + if (ret) goto DONE;\r
+> \r
+> - if (output != stdout)\r
+> - fclose (output);\r
+> + ret = gzflush (output, Z_FINISH);\r
+> + if (ret) {\r
+> + fprintf (stderr, "Error flushing output: %s\n", gzerror (output, NULL));\r
+> + goto DONE;\r
+> + }\r
+> +\r
+> + if (output_file_name) {\r
+> + ret = fdatasync (outfd);\r
+> + if (ret) {\r
+> + fprintf (stderr, "Error syncing %s to disk: %s\n",\r
+> + name_for_error, strerror (errno));\r
+> + goto DONE;\r
+> + }\r
+> + }\r
+> +\r
+> + if (gzclose_w (output) != Z_OK) {\r
+> + ret = EXIT_FAILURE;\r
+> + goto DONE;\r
+> + }\r
+\r
+... output = NULL; here, and ...\r
+\r
+> +\r
+> + if (output_file_name) {\r
+> + ret = rename (tempname, output_file_name);\r
+> + if (ret) {\r
+> + fprintf (stderr, "Error renaming %s to %s: %s\n",\r
+> + tempname, output_file_name, strerror (errno));\r
+> + goto DONE;\r
+> + }\r
+> +\r
+> + }\r
+> + DONE:\r
+\r
+...\r
+if (output)\r
+ gzclose_w (output);\r
+here.\r
+\r
+> + if (ret != EXIT_SUCCESS && output_file_name)\r
+> + (void) unlink (tempname);\r
+> \r
+> return ret;\r
+> }\r
+> @@ -158,6 +213,7 @@ notmuch_dump_command (notmuch_config_t *config, int argc, char *argv[])\r
+> int opt_index;\r
+> \r
+> int output_format = DUMP_FORMAT_BATCH_TAG;\r
+> + notmuch_bool_t gzip_output = 0;\r
+> \r
+> notmuch_opt_desc_t options[] = {\r
+> { NOTMUCH_OPT_KEYWORD, &output_format, "format", 'f',\r
+> @@ -165,6 +221,7 @@ notmuch_dump_command (notmuch_config_t *config, int argc, char *argv[])\r
+> { "batch-tag", DUMP_FORMAT_BATCH_TAG },\r
+> { 0, 0 } } },\r
+> { NOTMUCH_OPT_STRING, &output_file_name, "output", 'o', 0 },\r
+> + { NOTMUCH_OPT_BOOLEAN, &gzip_output, "gzip", 'z', 0 },\r
+> { 0, 0, 0, 0, 0 }\r
+> };\r
+> \r
+> @@ -181,7 +238,7 @@ notmuch_dump_command (notmuch_config_t *config, int argc, char *argv[])\r
+> }\r
+> \r
+> ret = notmuch_database_dump (notmuch, output_file_name, query_str,\r
+> - output_format);\r
+> + output_format, gzip_output);\r
+> \r
+> notmuch_database_destroy (notmuch);\r
+> \r
+> diff --git a/test/T240-dump-restore.sh b/test/T240-dump-restore.sh\r
+> index 0004438..d79aca8 100755\r
+> --- a/test/T240-dump-restore.sh\r
+> +++ b/test/T240-dump-restore.sh\r
+> @@ -68,6 +68,18 @@ test_begin_subtest "dump --output=outfile --"\r
+> notmuch dump --output=dump-1-arg-dash.actual --\r
+> test_expect_equal_file dump.expected dump-1-arg-dash.actual\r
+> \r
+> +# gzipped output\r
+> +\r
+> +test_begin_subtest "dump --gzip"\r
+> +notmuch dump --gzip > dump-gzip.gz\r
+> +gunzip dump-gzip.gz\r
+> +test_expect_equal_file dump.expected dump-gzip\r
+> +\r
+> +test_begin_subtest "dump --gzip --output=outfile"\r
+> +notmuch dump --gzip --output=dump-gzip-outfile.gz\r
+> +gunzip dump-gzip-outfile.gz\r
+> +test_expect_equal_file dump.expected dump-gzip-outfile\r
+> +\r
+> # Note, we assume all messages from cworth have a message-id\r
+> # containing cworth.org\r
+> \r
projects / notmuch-archives.git / commitdiff