amazon web services - Running expect script on EC2 hangs, but runs successfully when manually invoked -


i'm writing expect script start ssh tunnel.

it gets run on ec2 when instance starts, part of deployment creates script .ebextensions config file.

when script run, gets stuck @ point:

enter passphrase key '/home/ec2-user/id_data_app_rsa':

if run same script manually on server succeeds , can see tunnel process running.

ps aux | grep ssh

root 19046 0.0 0.0 73660 1068 ? ss 16:58 0:00 ssh -i /home/ec2-user/id_data_app_rsa -p222 -vfn -l 3306:x.x.x.x:3306 root@x.x.x.x

i can verify script reading ssh_passphrase correctly printing console.

   set password $::env(ssh_passphrase)    send_user "retrieved env variable : $password "

this debug output ec2 logs:

enter passphrase key '/home/ec2-user/id_data_app_rsa':  interact: received eof spawn_id exp0

i'm baffled why it's getting no further here when ec2 deployer runs, continues when run manually.

this script in .ebextensions, script starts @ #!/usr/bin/expect:

files:    "/scripts/createtunnel.sh" :    mode: "000755"    owner: root    group: root    content: |    #!/usr/bin/expect    exp_internal 1    set timeout 60    # set variables    set password $::env(ssh_passphrase)    send_user "retrieved env variable : $password "    spawn -ignore hup ssh -i /home/ec2-user/id_data_app_rsa -p222 -vfn -l 3306:x.x.x.x:3306 root@x.x.x.x     expect {     "(yes/no)?" { send "yes\n" }     -re "(.*)assphrase"     { sleep 1; send -- "$password\n" }     -re "(.*)data_app_rsa"  { sleep 1; send -- "$password\n" }     -re "(.*)assword:"      { sleep 1; send -- "$password\n" }      timeout     { send_user "un-able login: timeout\n"; return }     "denied"    { send_user "\nfatal error: denied \n"}     eof         { send_user "closed\n" ; return } } interact

your problem here:

set password $::env(ssh_passphrase)

and way shell works environment variables. when script invoked, assume environment variables set. depending on how script invoked, $::env(ssh_passphrase) may not set, resulting in variable null/blank. when init scripts (or cloud-init) run, not run environment of login shell. should not assume .profile or /etc/profile environment variables set, rather source or set them explicitly.

a possible solution may 

. ~ec2-user/.profile /path/to/above.script

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