test: (gnu) tar(1) portability

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+From: Tomi Ollila <tomi.ollila@iki.fi>\r
+To: <notmuch@notmuchmail.org>\r
+Subject: test: (gnu) tar(1) portability\r
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+Date: Sat, 11 Jan 2014 12:46:03 +0200\r
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+\r
+Hi\r
+\r
+Currently performance-test requires GNU tar and the uprgrade test\r
+in progress will (in it's current form) require it too.\r
+\r
+>From portability point of view these tests will work only on Linux\r
+by default -- BSD/Mac OS X have libarchive based tar(1) and other\r
+systems something less capable (no -z option, for example).\r
+\r
+>From the test point of view we can expect people to install GNU tar\r
+(somewhere) in for their systems but should we provide less "intrusive"\r
+way for having the GNU tar available.\r
+\r
+Options:\r
+\r
+1) Do nothing, and expect testers to have GNU tar in PATH available\r
+   before any other tar. For example /usr/local/bin/tar could be GNU tar\r
+   and that is put before /bin:/usr/bin in path.\r
+\r
+2) Change calls to 'tar' to format ${GNU_TAR:-tar} so testers can set \r
+   environment variable GNU_TAR to the name/path of gnu tar when running\r
+   tests (like GNU_TAR=/usr/local/bin/gtar make test or GNU_TAR=gtar ...)\r
+\r
+3) Check whether 'gtar' is in system and use that. if not use tar:\r
+\r
+   # opportunistically check whether 'gtar' is in system and use that if it is\r
+   if hash gtar >/dev/null\r
+   then TAR=gtar\r
+   else TAR=tar\r
+   fi\r
+\r
+   and then replate tar with ${TAR} ($ & {} to emphasize the variable usage)\r
+   in the test code.\r
+\r
+   Interestingly Fedora 20 installs both /usr/bin/gtar & /usr/bin/tar.\r
+   In one wheezy system I saw only tar. I tried to JFGI 'gnu tar installation'\r
+   but I could not find references to 'gtar' there.\r
+\r
+If installing gtar is widespread I'd use option 3. If not, option 2.\r
+It may be that we end up using option 1 ;/\r
+\r
+Tomi\r