[PATCH v2] paccache: Support cleaning many thousands of candidates

[Leonid Bloch]

In situations when there are many thousands of candidates for deletion,
paccache returns an "Argument list too long" error at the freed space
calculation stage, because the expansion of the ${candidates[@]} array
becomes too long for Bash.

This commit fixes that problem, by getting the @SIZECMD@ arguments via
`printf '%s\0' "${candidates[@]}" | xargs -0`, similarly to what is done
for the (re)moving commands below.

Signed-off-by: Leonid Bloch <lb.workbox at gmail.com>
---
 src/paccache.sh.in | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/paccache.sh.in b/src/paccache.sh.in
index af901f4..1311fd7 100644
--- a/src/paccache.sh.in
+++ b/src/paccache.sh.in
@@ -391,7 +391,8 @@ candidates=("${candtemp[@]}")
 unset candtemp
 
 # do this before we destroy anything
-totalsaved=$(@SIZECMD@ "${candidates[@]}" | awk '{ sum += $1 } END { print sum }')
+totalsaved=$(printf '%s\0' "${candidates[@]}" | xargs -0 @SIZECMD@ |
+		awk '{ sum += $1 } END { print sum }')
 
 # Exit immediately if a pipeline returns non-zero.
 set -o errexit
-- 
2.26.2