Strace of cfagent - where does the actual mount of new fstab entires hap

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Strace of cfagent - where does the actual mount of new fstab entires hap

From:	Rob Martin
Subject:	Strace of cfagent - where does the actual mount of new fstab entires happen?
Date:	Thu, 23 Jun 2005 08:56:29 -0400

Hello, I am researching cfengine for a masters thesis. (Exercising a set oftest cases on cfengine isconf,lcfg,a few others to compare how they dothings).A snippet below is the end of the strace I ran on a very simple test ofcfagent running a simple mount of three directories on a server.(What youneed to run adobe acrobat reader from a server). I am trying to figure outwhere in the strace cfagent actually causes the edited fstab file to be usedto actually mount the filesytem directories from the server which were addedto fstab. I can see the strace output where the new entries are added to thefstab file - but not the system trace of the actual mount of the directires.(Are they mounted autmatically when fstab is closed?)

Can anyone point out the lines in the strace that actually trace this actiontaking place that makes the server directories available on the client? Iapologize if I am too newbie in linux to get this. When I run the cfagentwith this cf file the filesystems are indeed mounted and immediatelyavalable on the client running the cfagent.

Thanks for any clues,
rob martin,
MS Candidate in Computer Science
East Tennessee State University

"server" cfgserver   "client" cfgclient3

I am runningn cfagent directly on the client - so there is no cfservd"connection" between the client and the server - cfagent is working to addand mount directories on the server, put not pull any configuration files ordata from the server in the cfagent execution of this cf file. The commandline sytnax used to call strace and cfagent are in the beginning of thesnippet below, along with the results towards the end.


-------The test-----------
the cf file is mountfiles6-7.cf and the contents of that cf file is simply:

control:
   actionsequence =
        (
        mountall
        mountinfo
        addmounts
        mountall
         )

binservers:

        cfgserver

homeservers:

        cfgserver

mountables:

        cfgserver:/opt/adobe
        cfgserver:/usr/lib/acrobat
        cfgserver:/usr/share

---end of cf file ---

--snippet of strace of cfagent- near the end where the fstab work is beingdone ----

actual strace command line call -

[root@cfgclient3 bin]# strace -o traceMountFileCFafter-fstab-comment-out./cfagent -f /var/cfengine/inputs/mountfiles6-7.cf

---begin snippet - no edits to this snippet from start of this clip to endof output ---



open("/etc/fstab", O_WRONLY|O_APPEND|O_CREAT|O_LARGEFILE, 0666) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=850, ...}) = 0

mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =0x40017000

fstat64(3, {st_mode=S_IFREG|0644, st_size=850, ...}) = 0
_llseek(3, 850, [850], SEEK_SET)        = 0
write(3, "cfgserver:/opt/adobe \t /opt/adob"..., 54) = 54
close(3)                                = 0
munmap(0x40017000, 4096)                = 0
chmod("/etc/fstab", 0644)               = 0
open("/etc/fstab", O_RDONLY|O_LARGEFILE) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=904, ...}) = 0

mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =0x40017000

read(3, "LABEL=/                 /       "..., 4096) = 904
read(3, "", 4096)                       = 0
close(3)                                = 0
munmap(0x40017000, 4096)                = 0
open("/etc/fstab", O_WRONLY|O_APPEND|O_CREAT|O_LARGEFILE, 0666) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=904, ...}) = 0

mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =0x40017000

fstat64(3, {st_mode=S_IFREG|0644, st_size=904, ...}) = 0
_llseek(3, 904, [904], SEEK_SET)        = 0
write(3, "cfgserver:/usr/lib/acrobat \t /us"..., 66) = 66
close(3)                                = 0
munmap(0x40017000, 4096)                = 0
chmod("/etc/fstab", 0644)               = 0
open("/etc/fstab", O_RDONLY|O_LARGEFILE) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=970, ...}) = 0

mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =0x40017000

read(3, "LABEL=/                 /       "..., 4096) = 970
read(3, "", 4096)                       = 0
close(3)                                = 0
munmap(0x40017000, 4096)                = 0
open("/etc/fstab", O_WRONLY|O_APPEND|O_CREAT|O_LARGEFILE, 0666) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=970, ...}) = 0

mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =0x40017000

fstat64(3, {st_mode=S_IFREG|0644, st_size=970, ...}) = 0
_llseek(3, 970, [970], SEEK_SET)        = 0
write(3, "cfgserver:/usr/share \t /usr/shar"..., 54) = 54
close(3)                                = 0
munmap(0x40017000, 4096)                = 0
chmod("/etc/fstab", 0644)               = 0
getuid32()                              = 0

open("/var/cfengine/cfengine_lock_db", O_RDWR|O_CREAT|O_EXCL|O_LARGEFILE,0644) = -1 EEXIST (File exists)

open("/var/cfengine/cfengine_lock_db", O_RDWR|O_LARGEFILE) = 3
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
fstat64(3, {st_mode=S_IFREG|0644, st_size=8192, ...}) = 0
_llseek(3, 0, [0], SEEK_SET)            = 0

read(3, "\0\0\0\0\1\0\0\0\0\0\0\0b1\5\0\10\0\0\0\0\20\0\0\0\t\0"..., 256) =256

close(3)                                = 0
stat64("/var/tmp", {st_mode=S_IFDIR|S_ISVTX|0777, st_size=4096, ...}) = 0

mmap2(NULL, 274432, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)= 0x402aa000

open("/var/cfengine/cfengine_lock_db", O_RDWR|O_LARGEFILE) = 3
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
fstat64(3, {st_mode=S_IFREG|0644, st_size=8192, ...}) = 0

pread(3, "\0\0\0\0\1\0\0\0\0\0\0\0b1\5\0\10\0\0\0\0\20\0\0\0\t\0"..., 4096,0) = 4096pread(3, "\0\0\0\0\1\0\0\0\1\0\0\0\0\0\0\0\0\0\0\0\10\0\260\16\1"..., 4096,4096) = 4096pwrite(3, "\0\0\0\0\1\0\0\0\0\0\0\0b1\5\0\10\0\0\0\0\20\0\0\0\t\0"..., 4096,0) = 4096

fsync(3)                                = 0
close(3)                                = 0
munmap(0x402aa000, 274432)              = 0

open("/var/cfengine/cfengine_lock_db", O_RDWR|O_CREAT|O_EXCL|O_LARGEFILE,0644) = -1 EEXIST (File exists)

open("/var/cfengine/cfengine_lock_db", O_RDWR|O_LARGEFILE) = 3
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
fstat64(3, {st_mode=S_IFREG|0644, st_size=8192, ...}) = 0
_llseek(3, 0, [0], SEEK_SET)            = 0

read(3, "\0\0\0\0\1\0\0\0\0\0\0\0b1\5\0\10\0\0\0\0\20\0\0\0\t\0"..., 256) =256

close(3)                                = 0
stat64("/var/tmp", {st_mode=S_IFDIR|S_ISVTX|0777, st_size=4096, ...}) = 0

mmap2(NULL, 274432, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)= 0x402aa000

open("/var/cfengine/cfengine_lock_db", O_RDWR|O_LARGEFILE) = 3
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
fstat64(3, {st_mode=S_IFREG|0644, st_size=8192, ...}) = 0

pread(3, "\0\0\0\0\1\0\0\0\0\0\0\0b1\5\0\10\0\0\0\0\20\0\0\0\t\0"..., 4096,0) = 4096pread(3, "\0\0\0\0\1\0\0\0\1\0\0\0\0\0\0\0\0\0\0\0\10\0\260\16\1"..., 4096,4096) = 4096

getpid()                                = 8494
time(NULL)                              = 1119493752

pwrite(3, "\0\0\0\0\1\0\0\0\0\0\0\0b1\5\0\10\0\0\0\0\20\0\0\0\t\0"..., 4096,0) = 4096pwrite(3, "\0\0\0\0\1\0\0\0\1\0\0\0\0\0\0\0\0\0\0\0\10\0\260\16\1"..., 4096,4096) = 4096

fsync(3)                                = 0
close(3)                                = 0
munmap(0x402aa000, 274432)              = 0
getpid()                                = 8494

open("/var/cfengine/cfengine..runlog",O_WRONLY|O_APPEND|O_CREAT|O_LARGEFILE, 0666) = 3

fstat64(3, {st_mode=S_IFREG|0644, st_size=3263, ...}) = 0

mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =0x40017000

fstat64(3, {st_mode=S_IFREG|0644, st_size=3263, ...}) = 0
_llseek(3, 3263, [3263], SEEK_SET)      = 0
time(NULL)                              = 1119493752
write(3, "Wed Jun 22 22:29:12 2005:Lock re"..., 73) = 73
close(3)                                = 0
munmap(0x40017000, 4096)                = 0

stat64("/var/cfengine/cfengine..runlog", {st_mode=S_IFREG|0644,st_size=3336, ...}) = 0

time(NULL)                              = 1119493752
getuid32()                              = 0

open("/var/cfengine/state/allclasses", O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE,0666) = 3

fstat64(3, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0

mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =0x40017000

write(3, "192_168_1\n192_168_1_3\n32_bit\nDay"..., 407) = 407
close(3)                                = 0
munmap(0x40017000, 4096)                = 0
getuid32()                              = 0

open("/var/cfengine/cfengine_lock_db", O_RDWR|O_CREAT|O_EXCL|O_LARGEFILE,0644) = -1 EEXIST (File exists)

open("/var/cfengine/cfengine_lock_db", O_RDWR|O_LARGEFILE) = 3
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
fstat64(3, {st_mode=S_IFREG|0644, st_size=8192, ...}) = 0
_llseek(3, 0, [0], SEEK_SET)            = 0

read(3, "\0\0\0\0\1\0\0\0\0\0\0\0b1\5\0\10\0\0\0\0\20\0\0\0\t\0"..., 256) =256

close(3)                                = 0
stat64("/var/tmp", {st_mode=S_IFDIR|S_ISVTX|0777, st_size=4096, ...}) = 0

mmap2(NULL, 274432, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)= 0x402aa000

open("/var/cfengine/cfengine_lock_db", O_RDWR|O_LARGEFILE) = 3
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
fstat64(3, {st_mode=S_IFREG|0644, st_size=8192, ...}) = 0

fsync(3)                                = 0
close(3)                                = 0
munmap(0x402aa000, 274432)              = 0
time(NULL)                              = 1119493752
time(NULL)                              = 1119493752
time(NULL)                              = 1119493752
time(NULL)                              = 1119493752
exit_group(0)                           = ?
[root@cfgclient3 bin]#

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