Add flag to change the location of the procfs.

Remove all hardcoded references to `/proc`. For all collectors that do
not use `github.com/prometheus/procfs` yet, provide a wrapper to
generate the full paths.

Reformulate help strings, errors and comments to remove absolute
references to `/proc`.

This is a breaking change: the `-collector.ipvs.procfs` flag is removed
in favor of the general flag. Since it only affected that collector it
was only useful for development, so this should not cause many issues.

1 files changed, 1 insertions, 2 deletions

diff --git a/collector/filesystem_linux.go b/collector/filesystem_linux.go
index 6090b2d..22e4998 100644
--- a/collector/filesystem_linux.go
+++ b/collector/filesystem_linux.go
@@ -14,7 +14,6 @@ import (
 
 const (
         defIgnoredMountPoints = "^/(sys|proc|dev)($|/)"
-        procMounts            = "/proc/mounts"
 )
 
 var (
@@ -60,7 +59,7 @@ func (c *filesystemCollector) GetStats() (stats []filesystemStats, err error) {
 }
 
 func mountPointDetails() ([]filesystemDetails, error) {
-        file, err := os.Open(procMounts)
+        file, err := os.Open(procFilePath("mounts"))
         if err != nil {
                 return nil, err
         }