Differences

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--- abstract:zfs-snapshots [2019/03/15 17:14]
frey [Accessing snapshots]
+++ abstract:zfs-snapshots [2019/03/15 17:18] (current)
frey [Accessing a snapshot]
@@ Line 39: / Line 39: @@
 ===== Accessing a snapshot =====
-Each snapshot under ''.zfs/snapshot'' is itself a directory, which can be navigated from the filesystem using the standard Linux file system commands (like ''cd'' and ''ls'').  The files and directories present in the snapshot cannot be modified (''rm'' and ''mv'' will not work, neither will attempts to edit files in place), but they can be read (e.g. with ''less'') or copied:
+Each snapshot under ''.zfs/snapshot'' is itself a directory, which can be navigated from the filesystem using the standard Linux file system commands (like ''cd'' and ''ls'').  The files and directories present in the snapshot cannot be modified (''rm'' and ''mv'' will not work, neither will attempts to edit files in place), but they can be read (e.g. with ''less'' or ''head'')
 <code bash>
 [frey@login00 ~]$ ls -l ~/trace.txt
@@ Line 46: / Line 45: @@
 [frey@login00 ~]$ ls -l ~/.zfs/snapshot/20190206-0115/trace.txt
 -rw-r--r-- 1 frey everyone 336436 Jan 25 09:39 /home/1001/.zfs/snapshot/20190206-0115/trace.txt
+[frey@login00 ~]$ head -5 ~/.zfs/snapshot/20190206-0115/trace.txt
+#
+# This file contains a code trace
+# from a run of my program that is
+# failing...
+#
+</code>
+or copied to some writable location using ''cp''
+<code bash>
 [frey@login00 ~]$ cp -a ~/.zfs/snapshot/20190206-0115/trace.txt ~/trace.txt
 [frey@login00 ~]$ ls -l ~/trace.txt
 -rw-r--r-- 1 frey everyone 336436 Jan 25 09:39 /home/1001/trace.txt
-[frey@login00 ~]$ head ~/trace.txt
+[frey@login00 ~]$ head -5 ~/trace.txt
-execve("/opt/shared/lumerical-fdtd/2019a-R1/bin/fdtd-config-license", ["fdtd-config-license"], [/* 45 vars */]) = 0
+#
-brk(NULL)                         = 0x1400000
+# This file contains a code trace
-mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2b82dd5d4000
+# from a run of my program that is
-readlink("/proc/self/exe", "/opt/shared/lumerical-fdtd/2019a"..., 4096) = 59
+# failing...
-access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
+#
-open("/opt/shared/lumerical-fdtd/2019a-R1/bin/../lib/tls/x86_64/libdl.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
+</code>
-stat("/opt/shared/lumerical-fdtd/2019a-R1/bin/../lib/tls/x86_64", 0x7fffdc1789d0) = -1 ENOENT (No such file or directory)
-open("/opt/shared/lumerical-fdtd/2019a-R1/bin/../lib/tls/libdl.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
-stat("/opt/shared/lumerical-fdtd/2019a-R1/bin/../lib/tls", 0x7fffdc1789d0) = -1 ENOENT (No such file or directory)
-open("/opt/shared/lumerical-fdtd/2019a-R1/bin/../lib/x86_64/libdl.so.2", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)