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From 78105a206a21133f87f5982f29d7aa3c4cc72b0d Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
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Date: Wed, 16 Mar 2022 09:28:46 +0100
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Subject: [PATCH] shared/install: skip unnecessary chasing of symlinks in
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disable
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We use the symlink source name and destination names to decide whether to remove
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the symlink. But if the source name is enough to decide to remove the symlink,
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we'd still look up the destination for no good reason. This is a slow operation,
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let's skip it.
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(cherry picked from commit 7a6c73dabf6451d6ef22d0cdfbb1749a77450d5b)
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Related: #2082131
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---
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src/shared/install.c | 43 +++++++++++++++++++++++++------------------
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1 file changed, 25 insertions(+), 18 deletions(-)
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diff --git a/src/shared/install.c b/src/shared/install.c
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index ad0238ab50..08a9892260 100644
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--- a/src/shared/install.c
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+++ b/src/shared/install.c
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@@ -599,8 +599,7 @@ static int remove_marked_symlinks_fd(
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r = q;
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} else if (de->d_type == DT_LNK) {
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- _cleanup_free_ char *p = NULL, *dest = NULL;
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- const char *rp;
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+ _cleanup_free_ char *p = NULL;
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bool found;
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int q;
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@@ -612,24 +611,32 @@ static int remove_marked_symlinks_fd(
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return -ENOMEM;
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path_simplify(p);
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- q = chase_symlinks(p, lp->root_dir, CHASE_NONEXISTENT, &dest, NULL);
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- if (q == -ENOENT)
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- continue;
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- if (q < 0) {
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- log_debug_errno(q, "Failed to resolve symlink \"%s\": %m", p);
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- unit_file_changes_add(changes, n_changes, q, p, NULL);
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+ /* We remove all links pointing to a file or path that is marked, as well as all
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+ * files sharing the same name as a file that is marked. Do path chasing only if
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+ * we don't already know that we want to remove the symlink. */
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+ found = set_contains(remove_symlinks_to, de->d_name);
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- if (r == 0)
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- r = q;
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- continue;
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- }
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+ if (!found) {
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+ _cleanup_free_ char *dest = NULL;
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+
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+
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+ q = chase_symlinks(p, lp->root_dir, CHASE_NONEXISTENT, &dest, NULL);
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+ if (q == -ENOENT)
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+ continue;
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+ if (q < 0) {
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+ log_debug_errno(q, "Failed to resolve symlink \"%s\": %m", p);
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+ unit_file_changes_add(changes, n_changes, q, p, NULL);
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- /* We remove all links pointing to a file or path that is marked, as well as all files sharing
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- * the same name as a file that is marked. */
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+ if (r == 0)
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+ r = q;
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+ continue;
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+ }
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+
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+ found = set_contains(remove_symlinks_to, dest) ||
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+ set_contains(remove_symlinks_to, basename(dest));
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+
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+ }
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- found = set_contains(remove_symlinks_to, dest) ||
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- set_contains(remove_symlinks_to, basename(dest)) ||
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- set_contains(remove_symlinks_to, de->d_name);
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if (!found)
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continue;
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@@ -650,7 +657,7 @@ static int remove_marked_symlinks_fd(
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/* Now, remember the full path (but with the root prefix removed) of
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* the symlink we just removed, and remove any symlinks to it, too. */
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- rp = skip_root(lp->root_dir, p);
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+ const char *rp = skip_root(lp->root_dir, p);
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q = mark_symlink_for_removal(&remove_symlinks_to, rp ?: p);
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if (q < 0)
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return q;
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