CODEWITHSUNDEEP
bashgitgit-submodules
rodee
rodee

Reputation: 3151

How to access variables used in "git submodule foreach" from outside?

How to recurse into all submodules and save the info to an array? that array should be accessible from outside of git submodule foreach, in the below example, I am trying to save all the paths which has foo in it.

$ declare -a paths
$ git submodule foreach --recursive '[[ "$name" = *"foo"* ]] && \
 ( echo $path; paths+=($path) ) || true'
Entering 'bar-1'
Entering 'foo-1'
foo-1
Entering 'foo-2'
foo-2
Entering 'foo-8'
foo-8
Entering 'foo'
foo
Entering 'baz'
$
$ echo ${paths[@]}
$

Upvotes: 1

Views: 1996

Answers (2)

torek
torek

Reputation: 487755

git submodule foreach runs in a sub-shell. This means there is no direct way to affect the parent shell, and that, in turn, means you need to affect the parent shell indirectly.

There are any number of ways to do this, but a simple one is to write to a file, then use source or . to read the file. Given your syntax above, you are presumably using bash, so:

git submodule foreach --recursive '[[ "$name" = *"foo"* ]] && \
     ( echo $path; echo "paths+=($path)" >> /tmp/paths ) || true'
source /tmp/paths
rm /tmp/paths
echo ${paths[@]}

Another way to do this is to eval the output of the foreach, but this is trickier since you then have to be careful with all output. There's a handy trick with exec for this, to redirect various file descriptors:

exec 1>&3
eval $(command)

where command expands (via alias or shell function, or script, or whatever) to:

command() {
    exec 4>&1 1>&3 3>&-
    echo now we can print normally
    echo var=value 1>&4 # this is a directive for the "eval"
}

The outer 3>&1 makes a copy of stdout for the inner command, which then moves its fd 1 to fd 4, moves 3 to 1, and closes 3. Now the inner command's stdout is the same as the outer stdout, while fd 4 is where the items to be eval-ed go.

Upvotes: 3

jthill
jthill

Reputation: 60245

Write the values as assignment statements to a temp file. Source the temp file.

Upvotes: 0

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